Trigger Points Definition And Types Health And Social Care Essay

Primary trigger points develop independently and non as the consequence of trigger point activity elsewhere. Secondary trigger points may develop in counter musculuss and neighbouring protective musculuss as a effect of emphasis and musculus cramp. It is normally experienced in patients after primary trigger point riddance. Satellite trigger points may develop in the country of referred hurting as a consequence of relentless resting motor unit activity in the musculus. Generation of trigger points consequences from the development of secondary and satellite trigger points. This concatenation reaction of trigger point generation may be elicited by many factors, including musculus failing, tenseness, and postural abnormalcies. ( 1 ) Active trigger points are considered stamp, painful, and diagnostic with hurting at remainder and during gesture. There are two common reactions seen in patients when feeling active trigger points. The first 1 is a seeable â€Å" local vellication response † of the musculus or tegument. The 2nd reaction is known as the â€Å" leap response † , where the patient tends to leap or travel off from the healer ‘s palpating manus during scrutiny. Palpation of a trigger point causes a local or specific referred hurting form, which is limited to primary trigger points. A thorough cognition and apprehension of referred hurting forms are necessary to forestall any errors when handling trigger points ( orbiter ) in the referred hurting countries and neglecting to detect the primary trigger point ( 1 ) Latent trigger points are normally found coincidentally on tactual exploration. They are described as symptomless and do non necessitate intervention unless they are activated. Latent trigger points are stamp and may show a local vellication response. Latent trigger points may be a cause of musculus shortening and failing even though they are non painful. Latent trigger points are largely found in the country of the shoulder girdle, aiming the cowl muscle and levator shoulder blade musculuss. ( 1 )Gun trigger Points: History and Literature ReviewGun trigger points were first described and mapped by Janet G. Travell, MD in the 1940 ‘s. Later in old ages, Drs. Travell and David Simons both wrote the text edition on Trigger point Therapy: Myofascial Pain and Dysfunction: The Trigger Point Manual. Sixty old ages of medical research has shown that trigger point therapy relieves hurting, nevertheless the medical community has been slow to advance its usage. ( 2 ) In 2007, a reappraisal of diagnostic standards used in surveies of trigger points concluded that there is yet limited consensus on the definition of myofascial trigger point hurting syndrome. Further research is required in order to prove the dependability and cogency of both the diagnostic standards and the effectivity of intervention intercessions. ( 3 ) In 1942, Dr. Janet Travell foremost used the term â€Å" trigger point † to depict a clinical determination which holds the undermentioned features: Pain related to a discrete, cranky point in skeletal musculus or facia, non caused by acute local injury, redness, devolution, tumor or infection. A painful point or a tumour is felt in the musculus that can arouse a vellication response upon stimulation. Palpation of the trigger point reproduces the patient ‘s symptoms of hurting which can radiate typical of the specific musculus incorporating the trigger point. Neurological scrutiny findings can non explicate the trigger point hurting behaviour. The history associated with trigger points suggested many thoughts on how they are formed and why they cause hurting. It was one time believed that trigger points were inflammatory cicatrixs in the musculus. However, biopsies disproved this when they showed no abnormalcies. More late, it has been claimed that trigger points are spasms or contractures of voluntary musculuss, likely caused by an abnormalcy at the neuromuscular junction where the nervousnesss commanding musculuss connect to the musculus fibres ( Travell & A ; Simons, 1999 ) . However this theory seems dubious since no contractions of voluntary musculus appear to be identified by traditional EMG and since the trigger points are frequently off from the site of the neuromuscular junction. ( 4 ) The most recent suggested mechanism is that trigger points are muscle spindles, which are activated by adrenalin stimulation. These, 1 centimeter in length, musculus fibres, are called intrafusal musculus fibres separating them from the voluntary musculus fibres, which are known as extrafusal musculus fibres. The intrafusal musculus fibres inside the spindle alone are stimulated by epinephrine through the sympathetic nervous system. The â€Å" sympathetic spindle cramp † theory of trigger points proposes that when spindles are over-stimulated by epinephrine they become painful. The diagrams below illustrate the difference between intrafusal and extrafusal musculus fibres: ( 4 ) Figure1- Muscle spindles: Intrafusal and extrafusal fibres Figure2- Neural Circiut ( intrafusal/sensory and extrafusal/motor ) The most acknowledged theory that explains the trigger point mechanism suggests that the muscular overload leads to a drawn-out release of Ca2+ ion from the sarcoplasmic Reticulum, storage unit for the musculus cell, ensuing in a sticking of the untrained or overladen cells. This causes a contracture with compaction of capillaries, increasing local energy demand and local ischaemia to the country. This â€Å" energy crisis † causes the release of chemicals that enhance hurting activity. As a consequence of this activity, the involved musculus is weakened therefore leting the environing musculuss to develop trigger points in a compensatory mode ( 4 )Gun trigger Points: The Travell and Simons ModelThis theoretical account presently represents the most normally recognized account as to the etiology of trigger points. They suggest the followers ( 5 ) : Dysfunctional end-plate activity occur, largely associated with a strain, taking to an inordinate release of acetylcholine ( Ach ) at the synapse, along with stored Ca High Ca degrees maintain the calcium-charged Gatess unfastened, while the Ach continue to be released An oxygen/nutrient shortage is created as a consequence from ischaemia in the country, which in bend leads to a local energy crisis Without available ATP, the local tissue is unable to rinse out the accrued Ca ions which are ‘keeping the Gatess open ‘ for Ach to go on being released Washing out the overruning Ca needs more energy than prolonging a contracture, so the contracture remains The ensuing muscle-fiber contracture ( nonvoluntary, without motor potencies ) is different from a contraction ( voluntary with motor potencies ) The contracture is maintained by the chemical science at the excitation country, non by action potencies from the cord While the endplate supports bring forthing Ach flow, the actin/myosin fibrils assume a to the full shortened place ( a weakened province ) in the immediate country around the motor end-plate ( at the centre of the fibre ) This knot is the ‘nodule ‘ which is the tangible feature of a trigger point As this procedure occurs, the balance of the sarcomeres of that fibre are stretched, making the taut nodule, which can normally be palpated ( 5 ) In 2008, a reappraisal in The Archivess of Physical Medicine and Rehabilitation concludes that Travell and Simons incorporate hypothesis is the most sure and most complete suggested etiology of myofascial trigger points. However, the feedback cringle proposed in this hypothesis has some weak links, and surveies by Shah and co-workers peculiarly provide a solid nexus for one of them. The feedback cringle connects the hypothesized energy crisis with the surroundings changes responsible for noxious stimulation of local nociceptors that leads to the local and referred hurting of myofascial trigger points. Shah ‘s studies quantify the presence of non merely 1 noxious stimulation but 11 of them with great concentrations of immune system chemicals. The consequences besides strongly put a important clinical differentiation between active and latent trigger points. Subjects with active trigger points in the musculus have a biochemical surroundings of selected inflammatory go-betweens, n europeptides, cytokines, and catecholamines unlike those in topics kicking of latent or absent trigger points. ( 6 )Causes of Trigger PointsJanet Travell and David Simons have confirmed that the undermentioned factors contribute to heightening and keeping trigger point activity: Nutritional lack, particularly vitamin C, B-complex and Fe Hormonal instabilities ( low thyroid, menopausal or premenstrual state of affairss, for case ) Infections ( bacteriums, viruses or barm ) Allergies ( wheat and dairy in peculiar ) Low oxygenation of tissues The reverberations of trigger point activity are far from a simple musculoskeletal hurting. They can be accompanied by hyperventilation and chronic weariness every bit good as evident pelvic inflammatory disease ( 5 )Gun trigger Points and Breathing Dysfunction:Trigger point activity is often found in the musculuss of the neckshoulder part which besides act as accessary external respiration musculuss, the scalenes in peculiar. In the event of chronic weariness and increased anxiousness, hyperventilation occurs, which can be associated with a assortment of secondary symptoms including concerns, cervix, shoulder and arm hurting, along with giddiness, palpitation, fainting, and digestive symptoms. ( 5 ) Clinically, where upper thorax fixators of the shoulder and intercostals, thoracic and paraspinal musculuss of the pectoral part are likely to feel as tense, fibrotic, with engagement of active trigger points. Successful take a breathing retraining and standardization of energy degrees seems in such instances to be accelerated following initial standardization of the functional unity of the accessary musculuss of respiration, whether straight or indirectly ( latissimus dorsi, psoas, quadratus lumborum ) ( 5 )Gun trigger Points and Referred Pain:Harmonizing to the medical lexicon of Dorland, referred hurting is a term used to depict the phenomenon of hurting perceived at a site next to or at a distance from the site of an hurt ‘s beginning ( 7 ) and harmonizing to physicians Janet Travell and David Simons, referred hurting is the specifying symptom of trigger points. The ground why many conventional interventions of hurting frequently fail is because referred hurting is a decept ive phenomenon. It ‘s a error to presume that the job is precisely at the topographic point that hurts. Travell and Simons ‘s research has shown that trigger points are the primary cause of hurting 75 % of the clip. Trigger points may do concerns, cervix and jaw hurting, low back hurting, tennis cubitus, and carpal tunnel syndrome. They are oftenly mistaken for arthritis, tendinoses, bursitis, or ligament hurt. Gun trigger points besides cause symptoms every bit diverse as giddiness, otalgias, sinusitis, sickness and pyrosis, every bit good as numbness in the custodies and pess. Even fibromyalgia may hold its beginnings with trigger points. ( 8 ) Referred hurting is often felt as an oppressive profound ache that can be sharpened by motion. Referred myofascial hurting can be every bit unbearable as post-surgical hurting. Muscles that have been subjected to strive or overload are susceptible to develop trigger points.These trigger points will do symptoms of stiffness and joint hurting. ( 8 ) Figure3- A music instrument that causes trigger points and referred hurting Referred hurting can frequently be triggered by simply pressing on a trigger point that is bad plenty to reproduce portion of its referred hurting behaviour. Since the mechanisms of the human nervous system are so unthinkably little, research on hurting referral is complicated. The bantam electrochemical urges in the nervousnesss can be detected and measured to a certain bound ; nevertheless, it is non with truth or great favoritism. Furthermore, moralss limit how far one can travel in hurting experiments. On the other manus, scientists have come up with a figure of theories explicating how hurting can be referred from its topographic point. The simplest hypothesis to accept refering referred hurting is that the signals fundamentally get assorted in the neurological wiring. Sensory inputs from several beginnings are known to unify into individual nerve cells at the spinal degree, where they are integrated and altered before being transmitted to the encephalon. As one electrical signa l may hold possible influence on another, mistaken feelings may ensue. ( 8 )A Microscopic Position:The undermentioned drawing is a representation of several musculus fibres within a trigger point. It shows a microscopic position of an existent trigger point. This specific trigger point would do concern over the left oculus and sometimes at the really top of the caput. ( 8 ) Figure4- A microscopic position of a trigger point in a musculus fibre Letter A is a muscular fibre in its resting province neither stretched nor contracted. The distance between the short intersections lines ( Z bands ) within the fibre characterizes the length of the single sarcomeres. The sarcomeres run along the length of the fibre, perpendicular to the Z sets. Letter B is a mass of sarcomeres in a musculus fibre which are in their province of upper limit uninterrupted contraction that define a trigger point. The ball-shaped construction of the contraction knot shows how that portion of the musculus fibre has drawn up and go shorter and wider, drawing the Z set closer together. Letter C is the section of the musculus fibre that originates from the contraction knot and extends to the musculus ‘s fond regard. In the figure, the bigger distance between the Z sets, demonstrates how the musculus fibre is being stretched by tenseness within the contraction knot. These overstretched constituents are what cause stringency and shortness in a musculus. Normally, the sarcomeres in a on the job musculus act as bantam pumps, which contract and relax in order to assist blood circulate through the capillaries that supply their metabolic demands. When sarcomeres in a trigger point hold their contraction, blood Michigans from fluxing to the country in demand. The ensuing oxygen lack every bit good as the accretion of the waste merchandises of metamorphosis exacerbates the trigger point. Therefore, the trigger point reacts to this crisis by directing out hurting signals ( 8 )Gun trigger Points vs. Tender Points:Since referred hurting is an of import feature of a trigger point, it is of import to distinguish between the two. ( 9 )Trigger PointsTender PointsLocal tenderness, tight set, local vellication response, leap mark Local tenderness There possibly remarkable or multiple points There are ever multiple points May occur in any skeletal musculus Occur in specific locations that are symmetrically located May do a particular referred hurting form Do non do referred hurting, but frequently cause a entire organic structure addition in hurting sensitiveness From the old tabular array, it is concluded that stamp points are associated with hurting at the site of tactual exploration merely, are non associated with referred hurting, and arise in the interpolation country of musculuss, non in tight sets in the musculus belly. Tender points occur in braces on different parts of the organic structure ensuing in equal distribution of hurting on equal sides of the organic structure. Tender points of fibromyalgia are present at nine bilateral musculus locations clarified as follows: ( 9 ) Low Cervical Region: at anterior facet of the interspaces between the transverse processes of C5-C7. Second Rib: at 2nd costochondral junctions. Occiput: at suboccipital musculus interpolations. Trapezius Muscle: at center of the upper boundary line. Supraspinatus Muscle: above the median boundary line of the scapular spinal column. Lateral Epicondyle: 2 centimeter distal to the sidelong epicondyle. Gluteal: at upper outer quarter-circle of the natess. Greater Trochanter: buttocks to the greater trochanteric prominence. Knee: at the median fat tablet proximal to the joint line. Figure5 -anterior and posterior position of stamp point ‘s locationsAppraisalThe single demands to be suitably assessed, In order for limitations and instabilities in the musculoskeletal system to be satisfactorily addressed, and perchance treated. Designation of the undermentioned factors is of import in a successful musculoskeletal appraisal ( 5 ) : Postural instabilities Forms of functional instability Forms of abuse Shortened musculuss Weakened musculuss Changes within musculuss and other soft tissues Joint limitation Functional instabilities ( for illustration: in respiration and pace )Palpation trials for Tender and Trigger Points:In the twelvemonth of 1992, a survey was carried out in order to prove the truth of tactual exploration for both stamp points and trigger points in myofascial tissues. Subjects from three groups were tested- some with fibromyalagia syndrome ( FMS ) , some complaing from myofascial hurting syndrome ( MPS ) and some with no hurting or any other symptoms. The FMS patients were easy identified as 38 % of the FMS patients were identified to hold trigger points. On the other manus, merely 23.4 % of the MPS patients were found as holding trigger points and of the normal topics, less than 2 % had any. Most of the MPS patients had stamp points in sites typically tested in FMS and would hold qualified for this diagnosing every bit good ( 5 ) . There are a figure of tactual exploration methods by ways of which trigger or stamp points can easy be identified. One simple effectual method is the usage of what is termed as ‘drag ‘ tactual exploration. A light transition of a individual figure, finger or pollex, across the tegument provokes a sense ‘drag ‘ , when the tegument has increased H2O content in comparing with its environing tegument. This increased hydrosis seems to demo a relationship with increased sympathetic activity, which accompanies a trigger point activity. In add-on, the tegument overlying a trigger point will expose reduced snap when mildly stretched apart, compared to the environing tegument. These countries are known as ‘hyperalgesic tegument zones ‘ and identifies a farther characteristic, which is a decreased extent of skin motion over the implicit in facia, tangible when originating a slide or ‘roll ‘ motion on the tegument. These three old features of skin alteration present effectual indexs as to underlying disfunction. Systematic attacks to the graphing of trigger point locations and their inactivation are provided by systems such as neuromuscular technique ( NMT ) , in which a methodical sequence of palpatory geographic expeditions are carried out, based on the trigger point ‘maps ‘ . In order to â€Å" run into and fit † tissue tenseness, it is indispensable to invariably vary tactual exploration force per unit area when trying to feel for trigger points at deepness, non merely utilizing skin marks. ( 5 ) Figure6- Trigger Point PalpationTrigger Point Locations:Gun trigger Points: Head and Neck Paraspinous Neck Muscles: refer hurting to occiput Upper Trapezius: refer hurting to make out and temporal brow Sternocleidomastoid: associated with Otalgia and perchance Vertigo Clavicle Muscular structure: referred hurting across brow and behind ear Sternal Muscular structure: referred hurting into occiput, cheek and periorbital Cervical paraspinous musculus: mention temporal-orbital hurting Peri-auricular musculuss: referred hurting to teeth and chew the fat Gun trigger Points: Shoulder, Thorax, and Arm Serratus Anterior Muscle: referred hurting to sidelong thorax and shoulder blade boundary line Pectoralis Major Muscle and Pectoralis Minor Muscle: referred hurting to breast and ulnar arm Levator scapulae Muscle: referred hurting to base of cervix Infraspinatus Muscle: referred hurting to shoulder articulation and down upper arm Supraspinatus Muscle: referred hurting to middle deltoid and cubitus Gun trigger Points: Back and Buttock Quadratus Lumborum Muscle: referred hurting to moo back Iliocostalis Muscle: referred hurting to lower quarter-circle of venters and to buttock Gluteus Maximus Muscle: referred hurting to sacrum and inferior cheek Gun trigger Points: Thigh, Leg and Foot Quadricepss Femoris ( anterior thigh quad musculuss ) Rectus femur referred to patella and distal thigh Vastus intermedius referred to upper thigh Vastus medialis referred to median articulatio genus ( 10 ) Bicepss Femoris: referred hurting to calf Gastrocnemius: referred hurting to calf and pes instep Soleus: referred hurting to list and to sacroiliac articulation ( 10 )Choice of Trigger Point TreatmentA successful intervention protocol should follow a sequence that begins with properly placing the trigger points, deactivating them, and if all trigger points have been resolved, stretching the constructions affected back to their normal scope of gesture and length. In the instance of musculuss, where most intervention takes topographic point, this involves stretching the musculus utilizing a assortment of inactive, active, active isolated ( AIS ) and muscle energy techniques ( MET ) , every bit good as positional release therapy ( PRT ) , strain/counterstrain ( SCS ) and integrated neuromuscular suppression technique ( INIT ) , along with proprioceptive neuromuscular facilitation ( PNF ) stretching to be effectual. Myofascial release should besides be used to handle fascia environing musculuss in order to stretch and decide strain forms ; otherwise musculuss will merely be returned to places where they are likely to re-activate trigger points. ( 11 ) The manual therapy intervention result is related to the degree of the healer ‘s accomplishment, that is if trigger points are pressed for a short period of clip, they may trip or stay active, and if pressed excessively long or hard, they may be irritated or the kneading force may be difficult plenty to do a muscular contusion. This bruising can last for a period of 1-3 yearss station intervention. Although patients may non truly be overexerting their musculuss, the application of the incorrect intervention methods can do symptoms of hurting similar to person who has been exerting for 24-72 hours. This is known as musculus febrility or delayed onset musculus tenderness ( DOMS ) . Pain can besides happen after a massage if the practician uses force per unit area on unnoticed latent or active trigger points, or is non competent in trigger point therapy ( 11 ) .Treatment MethodsA broad scope of intervention techniques have been recommended in handling trigger points, including rep ressive force per unit area methods ( Nimmo, Lief ) stylostixis, working utilizing ultrasound moving ridges ( Kleyhans and Aarons ) , chilling and stretching of the musculus where the trigger point lies ( Travell and Simons ) , certain injections ( Slocumb ) , active or inactive stretching ( Lewit ) , and even surgical intercession ( Dittrich ) . Clinical experience, confirmed by the thorough research of Travell and Simons, has indicated that while all or any of these techniques can successfully suppress trigger point activity impermanent, in order to wholly get rid of their noxious activity, more is frequently needed. Common sense every bit good as clinical experience provinces that the subsequent measure of rectification of such jobs related to trigger points should affect re-education or riddance of factors which contributed to the job ‘s patterned advance. This might every bit good affect ergonomic rating of the person ‘s work environment. Travell and Simons have bes ides made known that whatever original intervention is offered to suppress the neurological activity of the trigger point, the musculus in which it lies has to make its natural resting length after such intervention, otherwise the trigger point will quickly reactivate. In handling trigger points the technique of chilling the annoyed musculus harbouring the trigger while keeping it at stretch was adopted by Travell and Simons, while Lewit has advocated the Muscle Energy or mutual suppression technique prior to passive stretching. Although a sufficient grade of failure occurs, both techniques are normally successful, which calls for probe of more successful attacks ( 12 ) .8.2 INIT HypothesisClinical experience shows that by uniting the techniques of direct suppression, which is application of mild uninterrupted force per unit area in a brand and interruption form, along with the construct of strain/ counterstrain and MET, a specific intent can so be achieved ( 12 ) .Strain/Counterstr ain ( SCS ) constructJones has indicated that specific painful ‘points ‘ associating to a chronic or acute joint or muscular strain, can be used as ‘monitors ‘ , where force per unit area is being applied to them while the organic structure or organic structure portion is carefully positioned in such a manner as to cut down the hurting felt in the palpated country. When the place of relieve is reached in which pain disappears from the palpated monitoring country, the stressed tissues are felt to be at their most relaxed province, and clinical experience confirmed that this is so because they palpate as ‘easy ‘ instead than holding being tense. SCS is thought to achieve its benefits by ways of an automatic rearranging of musculus spindles, which help to order the length and tone in the tissues. It seems that this rearranging occurs merely when the musculus harbouring the spindle is at easiness and by and large consequences in a release of cramp and decrease in inordinate tone. ( 12 )INIT Method 1It would be rational to presume that were a trigger point being palpated by direct force per unit area, and were the underlying tissues in which the trigger point was housed to be gently positioned in such a manner as to cut down the hurting, that the most annoyed fibres in which the trigger point was lying would at that clip be in a place of alleviation or easiness. As a consequence there would be a trigger point under direct inhibitory force per unit area which had been positioned so that the underlying tissues were comparatively or wholly relaxed. ( 12 ) Refering the strain/counterstrain technique, the hurting free place is held for a period of clip between 30 to 90 seconds in order for the musculus spindles to reset themselves and let go of any cramp or contraction. ( 12 )8.5 Method 2Sing MET ; isolytic techniques use an bizarre isosmotic motion. The musculus concerned is actively contracted by the patient while a stretch is introduced at the same time, ensuing in the dislocation of hempen adhesions between the musculus and its constructions. In order to present this technique into trigger point therapy, after the application of repressive force per unit area and SCS release, the patient is asked to contract the musculuss around the feeling pollex or finger given that the contraction should non be a maximal force since the healer programs to gently stretch the tissues as the contraction is taking topographic point. This isosmotic bizarre attempt, intended to diminish contractions and interrupt down tissue adhesions, should take spec ifically at the tissues in which the trigger point being treated prevarications buried. After the isolytic stretch the tissues could profit from the application of hot and cold mode or effleurage massage in order to alleviate any local congestion ; nevertheless a patient is instructed to avoid any active usage of the country for a twenty-four hours or so. ( 12 ) Figure7 Figure8 Figure9 Figure7 illustrates the first phase of INIT in which a trigger point in the supraspinatus musculus is located and intermittently or persistently compressed. ( 5 ) Figure8 illustrates how the hurting is reduced from the trigger point by happening a place of relieve which is held for at least 20 seconds, after which an isometric contraction is attained sing the tissues which involve the trigger point. ( 5 ) Figure9 illustrates the measure after keeping the isometric contraction for an appropriate period of clip, during which the musculus harbouring the point of local soft tissue disfunction is stretched. This completes the INIT rhythm ( 5 ) .DecisionGun trigger points have been studied and shown to be the most frequent cause of musculoskeletal hurting. Trigger points cause the musculus to stay tight, weak, and stressed, which frequently consequences in hurting in nearby articulations. A alone component that differentiates trigger points from other muscular hurting is that trigger points about invariably refer hurting to other parts of the organic structure, which is why many interventions fail because most interventions assume that the country of hurting is besides the beginning of hurting, yet the existent cause could be in a wholly different topographic point. Trigger points limit motion of the musculuss and lessening circulation, striping the musculus of O and foods, ensuing in a agg regation of metabolic waste that can non be adequately filtered off. Furthermore, trigger points create shortened musculuss which lead to compression on nearby nervousnesss, therefore doing irregular esthesiss such as prickling and numbness. Trigger point therapy can diminish hurting, enhance motion, and let the musculuss to lengthen and go stronger by presenting a figure of methods, including force per unit area, stretching, working massage, and hot and cold modes. Applying force per unit area helps detain the annoying chemical rhythm, therefore alleviating hurting and contractions in the involved musculuss. Hot and cold modes can assist heighten the circulation and extinguish the metabolic waste merchandises. Stretching exercisings after trigger point release is besides shown effectual in maintaining the musculus in a elongated place ; by that, the force per unit area constituent of the hurting rhythm is diminished.

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Race Essay Example | Topics and Well Written Essays - 750 words

Race - Essay Example Beliefs surrounding this concept maintained that this chain was created by God and was very close to God in terms of perfection. This paper will seek to bring out issues regarding race which range from its history to current views. It will also give an insight as to whether there is need to replace the term â€Å"race† with something else like â€Å"ethnicity†. The etymology of the word â€Å"race† indicates that the term means common descent. Intellectual analysis on the book opines that the Europeans sought to define the term race at the Age of Enlightenment as a biological concept. However, as time went by, scholars tried to define and classify race into types, origins, and correlations (Spiller 45). Concerted efforts by Ember, Peregrine, and Ember show that biomedical researchers, as well as forensic anthropologists, collected and analyzed information on populations and individuals and established that race denotes distinctions which are scientifically practi cal (Ember, Ember, & Peregrine 97). In view of Hippocrates and many other thinkers, factors like climate and geography held a very significant place in shaping the physical appearance of different people. Ideally, the 19th century naturalists made attempts that changed race from taxonomy into a biological concept using anthropometrics. ... time, social conservatives exacerbated their belief and maintained that certain races portrayed innate inferiority after examining their shortcomings. A number of scientists claimed that they could determine the race of certain population or an individual by evaluating the subject’s DNA or genes. On the other end, the largest number of scientists understood that race was a social construct. These scientists believed that certain phonotypical expressions of individuals were useful in determining their race (Napolitano 128). Language, culture, and environment also played a primary role in shaping the behavioral characteristics of an individual and they were of great importance in determining the race of that individual (Ember, Ember, & Peregrine 112). The current views expressed by different people regarding race are different and overwhelming. The authors of this book mention that publications based on race as the subject receive uncomfortable facts, especially with reference t o race differences and intelligence. Academic research point out that, as of today, many people including intellectuals and mainstream journalists become highly emotional when they come across race related debates (Todorova 26). This means that many historic events revolving around race are always rather disappointing. Other archival resources reveal that different authors, co-authors, and liberals, as well as conservatives, admit that the subject of intelligence and race should hedge out, disqualified, and rendered meaningless. Black multiculturalists describe white people as mean and cold by ascertaining that they like manipulating things. On the other side, the same multiculturalists paint black people as empathetic because they entertain love. This difference in IQ colors the existing views

Octogram.net Essay Example | Topics and Well Written Essays - 500 words

Octogram.net - Essay Example I also scored a good point for achiever. I got 6 in this personality trait which means that I am very ambitious and like to set high goals for me. It is true because I am a kind of person who is always focused on achieving something in my professional life. In case of helper, I scored 7. It means that I am a very helpful person for others at work which is quite true about me. I love to work in teams and assist others through my knowledge. I also want my colleagues to achieve their professional goals. The areas in which I scored less were strategist, anchor, analyst, and team player. To my surprise, I scored just 2 points for strategist. It means that I am not interested in finding solutions for problems which does not seem true about me. I have the potential to set strategies to meet those goals. For anchor, I scored 4 points. The scored truly reflected my multitasking approach at the workplace. I like to get exposure to multiple areas of professional life rather than sticking to any particular role. For analyst, I scored 4 points which means that I am not able to dig into the problems. It does not seem correct because I am a problem-solver rather than problem-avoider. The last personality trait was team player for which I scored 4 points. It means that I am only concerned with my role in the team. It is again not correct about me because I like to help others when working as a team and like to maintain team harmony to achieve results. Summing it up, although some results went in favor of me and some appeared as if they were wrong, but they did expose my workplace personality traits. I think that this understanding would influence my managerial behaviors because managers need to be aware of their strengths and weaknesses. This octogram test would work as a good starting point for me and would definitely help me work on my weak areas. This response seems to be summing up all workplace

TSCA definitions Essay Example | Topics and Well Written Essays - 1000 words

TSCA definitions - Essay Example he various ways in which one can be exposed to PCBs include breathing air that contain PCBs, eating food that contain PCBs, or touching anything that contains them. PCBs usually remain in the environment for long periods of time, and for this reason, therefore, people can easily be exposed to them when they come in contact with things that contain them. Due to their long stay in the environment, one can easily be exposed to them by coming into contact with the equipment or any other thing that contain them like the, electrical transformers, capacitors, fluorescent lighting fixtures, and appliances. It is recommended by NIOSH that workers should not breathe air that contains 42 or 54% chlorine, i.e. PCB levels higher than 1 microgram per cubic meter of air (à ¯Ã‚ ¿Ã‚ ½g/m3) for a 10-hour workday, 40-hour workweek. EPA demands that companies that either transport, store, or dispose of PCBs adhere to the rules and regulations of the federal hazardous waste management program. Also, EPA limits the amount of PCBs put into public waste water treatment plants. Hexavalent chromium Cr(VI) is a valence state (+6) of the element chromium; there are many more valences of the element chromium. Cr(VI) is produced through an industrial process. One of the bad effects of Cr(VI) to human beings is that Cr(VI) is known to cause cancer. Also, Cr(VI) targets the respiratory system, liver, kidneys, skin and eyes. From the OSAH website we learn that approximately 558,000 workers are potentially exposed to Cr(VI) in the United States. Employees can be exposed to hex chrome in different was including breathing in of dusts, mists or fume, ingestion, or through dermal or eye contact . Wellbeing impacts related with presentation to hex chrome can include disturbance or harm to the skin and eyes.   Direct skin contact to Hex Chrome can bring about undesirable susceptible response known as contact dermatitis. Once an anaphylaxis grows, even concise skin contact can bring about manifestations.

Challenges in Groups and Teams Essay Example | Topics and Well Written Essays - 500 words

Challenges in Groups and Teams - Essay Example Collaborative (C) decision making takes a step in the direction of participation by way of consultation, and involves asking either certain individuals or, more generally, a group for their input. The manager solicits a recommendation from individuals or the group, but still makes the final decision. Empowered decision making completes the continuum. It is full participation, and entails empowering either an individual or a group to make final decisions. The particular people involved in a given communication episode can make the critical difference in whatever understandings result. Personal qualities and background factors influence the interpretations and meanings created by sources and perceivers. There are different key factors to consider with each decision-making style, and different levels of commitment to decisions that can be expected to result from each approach. The challenges can be overcome with the help of training and leadership support, planned intervention and posit ive climate and morale. The three stages: preparation, training and implementation and practical usage will help a team leader to overcome challenges in teamwork and create a dynamic team.

Argue which of the 3 sources best represent how civilian reacted in Essay

Argue which of the 3 sources best represent how civilian reacted in WW2 - Essay Example However, this article also illustrates of how some civilians were involved in the looting of property of both the dead and those who were alive. The article states that the act of looting was not talked about as it was thought that it would damage the nation’s morale. The article describes the civilians who were involved in looting as bomb chasers who only waited for an attack, and once the streets were empty they would break in shops and steal. It describes how the blitz was involved in the coverage of illegal activity and depicts how the civilians were involved in false claims for the loss of property. Arthur Marwick sees the second representation of the civilians’ action in the Second World War in the article. This article talks about how there was increased looting after the air raids, compared to the first representation it does not illustrate the wrong doings of the looters. It states that property would have been lost anyway despite the actions of the looters. The article shows how the civilians, for example, the propagandists, photographers, the editors, and journalists were all involved in creating images and labeling the ‘blitz spirit. It goes ahead to state that not all the British civilians were heroes. The third representation of the civilians’ actions in the Second World War is illustrated in the article by joseph Darrcot. This article shows how the participation of the nation in the war extended the war to the cities, and, as a result, the civilians became the targets. It shows that to the civilians’ it was an attempt to destroy morale. The civilians’ actions to the bombings are depicted in the article, for instance a cartoonist of the daily press illustrates the act of stoicism, where the amateur gardener check on his garden despite the air raid. From the picture the amateur is asked by the wife whether everything is okay, he reassures his wife that all is well, and he is not even scratched. This is a clear

Sociology of Marriage and Family Essay Example | Topics and Well Written Essays - 1500 words

Sociology of Marriage and Family - Essay Example As Andrew Sullivan has argued, if the future of marriage is a critical ground of contestation in the wider world, it is hardly surprising that lesbians and gays should focus their demands on it. If parenting is perceived as in major need of rethinking, then why should non-heterosexuals be excluded from the debate? They should be given equal rights and norms like heterosexuals. If families get ever more complex as a result of divorce, remarriage, recombination, and step-parenting, why should the chosen families of lesbians and gays be denied a voice? Even the ghost of uncontrolled homosexuality has been downplayed in today’s recent sexual world, it is amazing that despite the greater public presence of homosexual couples, researchers suggest that self-identified non-heterosexuals from a tiny percentage of a given population. There is still a surprisingly high degree of stability in family relationships, even if, as the form is changing. One of the most fundamental issues lies in the decline of the traditional heterosexual centrality of marriage as it is seen that heterosexual marriages involve the contribution of two partners more tended towards the family issues. At its most evocative, this type is seen as a haven of trust, mutual involvement and shared responsibilities, which many argue offers the best hope for a communitarian culture. But the fact, which is neglected today, is this haven of trust which builds communitarian culture serves as the basis for today’s major issues like a break-up, divorce, separation etc.... If families get ever more complex as a result of divorce, remarriage, recombination and step-parenting, why should the chosen families of lesbians and gays, composed of lovers, ex-lovers and friends, be denied a voice (Catherine, 2001, p. 25) Even the ghost of uncontrolled homosexuality has been downplayed in today's recent sexual world, it is amazing that despite the greater public presence of homosexual couples, researchers suggest that self-identified non-heterosexuals form a tiny percentage of a given population. There is still a surprisingly high degree of stability in family relationships, even if, as the form is changing. (Catherine, 2001, p. 25) One of the most fundamental issue, lies in the decline of the traditional heterosexual centrality of marriage as it is seen that heterosexual marriages involves the contribution of two partners more tended towards the family issues. At its most evocative, this type is seen as a haven of trust, mutual involvement and shared responsibilities, which many argue offers the best hope for a communitarian culture. But the fact, which is neglected today, is this haven of trust which builds communitarian culture serves as the basis for today's major issues like break-up, divorce, separation etc. So, in these circumstances what is the harm if one seeks his/her satisfaction in homosexual affair. The privileging of homosexual patterns is vividly apparent even in the most liberal discussions of the family and sexual diversity. On the one hand, many theoreticians give verbal recognition to the variety of family forms, and shift their concerns to the quality of relationships, and to the care of

Homeless And Public Policy Essay Example for Free

Homeless And Public Policy Essay Homeless   Ã‚  Ã‚  Ã‚   In any types of society, be it large or small scale, numerous problems can be experienced by the social elements building the public unit. In the case of Lakeland, Florida, there are now a great number of homeless individuals because of certain social and economic conditions.   Ã‚  Ã‚  Ã‚   Primarily, the main losers in this social problem are the individuals who are homeless. The homeless people tend to be the losers since they will not have much opportunity to improve their lives in the absence of a home. People in the neighborhood can also become the losers since some of them feel anxious about their security in the presence of homeless people in the streets of their community. In a positive perspective, the homeless people can also be considered as the primary gainers. These individuals in Lakeland can expect to have a warm compassionate reaction from its neighborhoods (Inside Lakeland, 2007).   Ã‚  Ã‚  Ã‚   There is a significant direct cost of having homeless people lurking in Lakeland. For one, damage to private and public properties may be involved in the complete manipulation by homeless individuals of the current infrastructure where they want to dwell in. Another is the possibility of garbage amount increase in the area because of improper disposal processes. The indirect cost on the other hand can be realized in the form of lesser external investments due to the visual and probably perceptive impression of investors.   Ã‚  Ã‚  Ã‚   The primary attributed factor which brings homelessness rates in Lakeland relatively high is somehow pointed out to personal concerns of individuals.   Alcoholism, drug use, mental health issues and unemployment are among the top issues. Thus, not being able to resolve these problems leads to homeless situations for people with such dilemmas in life.   References Inside Lakeland PD. 2007. Policing the Homeless in Lakeland. Retrieved November 29, 2007 from http://www.insidelakelandpd.org/2007/06/policing_the_ho.html.

The Qr Code Technology Computer Science Essay

The Qr Code Technology Computer Science Essay QR code, also called QR barcode.QR code is a information processing technology ,develop by base on grahic techonlege and computer techolage. It is to use a particular geometric figure according to rule in the two-dimension plane which is distribution of black and white graphic to record data . In the coding of clever, use 0, 1 bit stream concept which is constitute the basis of computer internal logic. The use of several and binary corresponding geometric shapes to represent text numerical information, through the image input device or photoelectric scanning equipment automatic to read in order to realize information automatic processing. Using a dedicated reading code or smartphone can be scanned to identify for which contained information. QR code can be expressed in information in two directions at the same time horizontal and vertical, so to express a lot of information in a very small area. QR code is not specially designed for mobile phones by itself, but with the development of mobile communication technology, mobile phones creates the QR code. Mobile phones QR code will be as QR code recognizer and carrier and hosted by QR code information navigation and information. Advantages of QR code The Advantages of QR code ¼Ã… ¡ QR code have high density informations and big capacity. Can record 1850 capital letters or 2710 digital or 1108 bytes. Lengthways and horizontal can record and store information. It can store much information and do not need information for connect internet. the scope of QR coding is very big. This QR code can coding sound pictures words number to be a shown digital information. never afraid local damage ¼Ã…’even the damaged area is 50%, can still get to read correctly. This features of QR code is a important effect for people daily life. The black QR code become colourful and have some fun idea picture inside. Let person want use QR code and seed up the communication for information. The decoding particularly accurate. Error rate is less than one over ten million. Use the QR code do not afraid can not find the source which QR code have. Can be encrypted. Security and confidentiality. Never afraid the inportant imformation will be steal. The trade secret will be saved,and company never lost anything. Easy to make,use for long time,cost less. Symbol shape and size ratio can be changed. can read by CCD reader and the laser. The Last Ocean (documentary) Applications of QR code QR codes as a kind of brand-new information storage, transmission and identification technology rapidly into the people daily life with the development of science and technology. Use mobile phone surf the internet,it is difficult to need enter long website. Use QR code will reduce this trouble,as long as you use phone to scan QR code on the book or adertising. It is not inconveninet to carry paper business cards. If the business card use QR code,it will convenient storages of business cards.Use mobile phone can scan the QR code can copy the name ,phone number,email.and company informations to your mobile phone from the business cards. It is easy to help you contact him and know his company. Use mobile phone to scan QR code can reduce the waste of paper and pollution of the environment. QR code attendance system is a certificate type of mobile data service of new products, belongs to the mobile phone QR code to be read application, it is modern mobile communications technology and QR code coding technology unifies in together, the content of the traditional certificate holders and information encoding become a QR code graphics, and through the SMS, MMS, etc to send to the users mobile phone, when using, through the special read code equipment on the opponent display QR code graphics for student can be verified. Its biggest characteristic is only sex and safety, not only to save the cost, more important is to save time improve efficiency convenient use, also very environmental protection and fashion. Before the exhibition, the organizer only through the system to give participants hair to contain QR code electronic invitation letter (MMS, SMS), the two-dimension code contains meeting message, as exhibition sign in documents. In the exhibition, the participants need to carry mobile phones easily finish attendance, bring the brand-new the experience. At the same time also to avoid the organizers field check information helter skelter embarrassment, and are very safe, effective identity verification, put an end to those false burst. The participants information in the validation, through the wireless communication system transmission to the system database, so that the exhibition participation situation be clear at a glance, and convenient to participate in the exhibition of the statistical work. The whole process adopted all electronic, the use of mobile phones as a certificate, realize the meeting attendance information. Difference between QR CODE and BAR CODE Code can split into one dimensional code and two dimensional code. one dimensional code is Bar code. It make up by a rule arrange strip space and number . this kind data coding can supply machine cognition and read,is very easy to translate binary system and decimal system. Bar code distinguish fast and high veracity  ¼Ã…’great fiexiblityà £Ã¢â€š ¬Ã¢â‚¬Å¡But, because of the Bar code only in one direction (horizontal) commonly show information. So the data capacity is small. Bar code often need to connect to the database in order to get more data from the network by limited information capacity. But Bar code will loses the role in under the condition of not forget or database. The QR code use Bar codes information stored way extension in the two-dimensional space, do not need to connect a database, it can store large data by itself, it is high density large capacity. QR code also have wide coding, high recognition rate, difficult to abrasion .low cost etc.It can be printed in newspapers and magazines and periodicals,let people use mobile phone to reader it. Risk It also have some problem with QR code. Some QR code is malicious. If you are a QR code lover, please kill virus when you scan the doubtable QR code, Or you need pay attention to instill the program which is after scan QR code.Beacuse some malicious QR code will steal your money and break your daily life. Most malicious QR code is seducing people installe program to commit fraud. People should be sure to read the phone installation prompts are given. The other malicious QR code is include virus. After you scan the QR code, it will install the mobile phone virus secretly. On top of, QR code security problem even live in code scanning software, some malicious QR code software will install virus or malicious ads in advance, if you instill it ,you mobile phone will get the malicious ads and high costs. These actions could occur in the background while the user is only seeing the reader opening a seemingly harmless web page. For example: In Russia, a malicious QR Code caused phones that s canned it to send premium texts at a fee of US$6 each. Colorful with QR code We usually see most software generated QR code is black when few years ago. Now we see most advertisement have colorful and personality QR code. This kind QR code s generation technique is not difficult.and this is young man love. Base on QR code never afraid local damage ,the QR codes part be overwritten or lost, scanning machine still be able to identify its record of complete information. Some website already provide free colorful QR code service to people. There are many personality QR code production tools in the internet ,if you like it ,you can do it by yourself. When you scan this QR code. You will get love you foreverby chinese. Conclusion I suggest our company use the QR code technology. QR code as things networking age a recognition terminal, will change peoples future life, also can make the future life more low carbon. The technology is cheap,it can not cost company much money. Never mind it will broken or lost . It is easy to carry that is in your mobile phone. And personality QR code will make staff have fun. The QR code let the staff work easily and environmentaly. So I suggest our company use the QR code technology.

Polyisobutylene Applications

Polyisobutylene Applications Fuel and lubricant additive. Polyisobutylene (in the form of polyisobutylene succinimide) has interesting properties when used as an additive in lubricating oils and motor fuels. Polyisobutylene added in small amounts to the lubricating oils used in machining results in a significant reduction in the generation of oil mist and thus reduces the operators inhalation of oil mist.[2] It is also used to clean up waterborne oil spills as part of the commercial product Elastol. When added to crude oil it increases the oils viscoelasticity when pulled, causing the oil to resist breakup when it is vacuumed from the surface of the water. As a fuel additive, polyisobutylene has detergent properties. When added to diesel fuel, it resists fouling of fuel injectors, leading to reduced hydrocarbon and particulate emissions.[3] It is blended with other detergents and additives to make a detergent package that is added to gasoline and diesel fuel to resist buildup of deposits and engine knock.[4] Polyisobutylene is used in some formulations as a thickening agent. [edit]Sporting equipment Butyl rubber is used for the bladders in basketballs, footballs, soccer balls and other inflatable balls to provide a tough, airtight inner compartment. [edit]Roof Repair Butyl rubber sealant is used for rubber roof repair and for maintenance of roof membranes (especially around the edges). It is important to have the roof membrane fixed, as a lot of fixtures (i.e., air conditioner vents, plumbing and other pipes, etc.) can considerably loosen it. Rubber roofing typically refers to a specific type of roofing materials that are made of ethylene propylene diene monomers (EPDM). It is crucial to the integrity of such roofs to avoid using harsh abrasive materials and petroleum-based solvents for their maintenance. Polyester fabric laminated to butyl rubber binder provides a single-sided waterproof tape that can be used on metal, PVC, and cement joints. It is ideal for repairing and waterproofing metal roofs. [edit]Gas masks and chemical agent protection Butyl rubber is one of the most robust elastomers when subjected to chemical warfare agents and decontamination materials. It is a harder and less porous material than other elastomers, such as natural rubber or silicone, but still has enough elasticity to form an airtight seal. While butyl rubber will break down when exposed to agents such as NH3 (ammonia) or certain solvents, it breaks down more slowly than comparable elastomers. It is therefore used to create seals in gas masks and other protective clothing. [edit]Chewing gum Molecular structure: Rubber Chemical Structure Introduction to rubber chemical structure: In the organic chemistry section of chemistry ,we learn about the various polymers , monomers,elastomers etc.Monomer is a single unit and when huge number of monomers are combined or say polymerised then polymers are formed.The process of conversion of monomer to polymer is known as p-olymerisation.Elastomer is an another category of polymers having a specific properties of regaining of its structure even if it is stretched.Rubber comes under the category of elastomer.In general life rubber has variety of uses.the important property of rubber is that it regains its structure even if it is stretched.Stretching can be done up to a certain limit.If it is stretched beyond limit then it can break. Rubber can be found in two forms 1)Natural rubber 2)Synthetic Rubber Natural rubber is a kind of rubber which which is found directly from the nature.And when the natural rubber is processed under some chemical processes then a new kind of rubber is formed ,this rubber is known as synthetic rubber.We can also say that natural rubber are synthesised from the natural rubber.Both this rubber are of great use because of its specific features. Structure of rubber: Main composition of crude rubber is hydrocarbons.It also contains some proteins and materials which are soluble in acetone.The hydrocarbons which possess the properties of rubber are usually high in molecular weight and it ranges from 45000 to 3000000.Isoprene is a monomer of natural rubber.When huge number of isoprene units are polymerised then a polymer is formed . Cis and Trans Configuration of Rubber The cis configuration of the natural rubber is the reason for the rubber properties in it. Cis configuration means that extension of the chain is on the same side of the ethylene bond.If the configuration is trans, it means that the extension of chain is on the both sides of ethylene bond,then it is a hard plastic.In case of trans it does not show the properties of rubber. Synthetic rubber is of great use in the industry.Some of the widely used synthetic rubber are butyl rubber which is formed by the copolymerisation of isobutylene and a little amount isoprene.Another synthetic rubber is Styrene Butadiene Rubber also known as SBR.Buna N and buna S is also a kind of synthetic rubber often use in the industry. Vulcanisation of Rubber In the rubber molecules the cross linking between the chains are very less.This leads to the softness in the rubber .To make the rubber hard some chemicals are added to it.The process is known as vulcanisation.In this process the natural rubber is treated with some chemicals ,more often chemical used is sulphur.When sulphur reacts with the natural rubber then it increases the cross linking between the molecules in the rubber.It also forms many sulphide bonds.Due to formation of many new crosslinkings and many sulphide bonds the natural rubber becomes hard.Natural rubber is a kind of thermoplastic,it means that it becomes soft when it is subjected to heat and it becomes hard when it is subjected to cold. butyl rubber (IIR), also called isobutylene-isoprene rubber, a synthetic rubber produced by copolymerizing isobutylene with small amounts of isoprene. Valued for its chemical inertness, impermeability to gases, and weatherability, butyl rubber is employed in the inner linings of automobile tires and in other specialty applications. Both isobutylene (C[CH3]2=CH2) and isoprene (CH2=C[CH3]-CH=CH2) are usually obtained by the thermal cracking of natural gas or of the lighter fractions of crude oil. At normal temperature and pressure isobutylene is a gas and isoprene is a volatile liquid. For processing into IIR, isobutylene, refrigerated to very low temperatures (approximately à ¢Ã‹â€ Ã¢â‚¬â„¢100  °C [à ¢Ã‹â€ Ã¢â‚¬â„¢150  °F]), is diluted with methyl chloride. Low concentrations (1.5 to 4.5 percent) of isoprene are added in the presence of aluminum chloride, which initiates the reaction in which the two compounds copolymerize (i.e., their single-unit molecules link together to form giant, multiple-unit molecules). The polymer repeating units have the following structures: Because the base polymer, polyisobutylene, is stereoregular (i.e., its pendant groups are arranged in a regular order along the polymer chains) and because the chains crystallize rapidly on stretching, IIR containing only a small amount of isoprene is as strong as natural rubber. In addition, because the copolymer contains few unsaturated groups (represented by the carbon-carbon double bond located in each isoprene repeating unit), IIR is relatively resistant to oxidation-a process by which oxygen in the atmosphere reacts with the double bonds and breaks the polymer chains, thereby degrading the material. Butyl rubber also shows an unusually low rate of molecular motion well above the glass transition temperature (the temperature above which the molecules are no longer frozen in a rigid,glassy state). This lack of motion is reflected in the copolymers unusually low permeability to gases as well as in its outstanding resistance to attack by ozone. The copolymer is recovered from the solvent as a crumb, which can be compounded with fillers and other modifiers and then vulcanized into practical rubber products. Owing to its excellent air retention, butyl rubber is the preferred material for inner tubes in all but the largest sizes. It also plays an important part in the inner liners of tubeless tires. (Because of poor tread durability, all-butyl tires have not proved successful.) IIR is also used for many other automobile components, including window strips, because of its resistance to oxidation. Its resistance to heat has made it indispensable in tire manufacture, where it forms the bladders that retain the steam or hot water used to vulcanize tires. Bromine or chlorine can be added to the small isoprene fraction of IIR to make BIIR or CIIR (known as halobutyls). The properties of these polymers are similar to those of IIR, but they can be cured more rapidly and with different and smaller amounts of curative agents. As a result, BIIR and CIIR can be cocured more readily in contact with other elastomers making up a rubber product. Butyl rubber was first produced by American chemists William Sparks and Robert Thomas at the Standard Oil Company of New Jersey (nowExxon Corporation) in 1937. Earlier attempts to produce synthetic rubbers had involved the polymerization of dienes (hydrocarbon molecules containing two carbon-carbon double bonds) such as isoprene and butadiene. Sparks and Thomas defied convention by copolymerizing isobutylene, an olefin (hydrocarbon molecules containing only one carbon-carbon double bond) with small amounts-e.g., less than 2 percent-of isoprene. As a diene, isoprene provided the extra double bond required to cross-link the otherwise inert polymer chains, which were essentially polyisobutylene. Before experimental difficulties were resolved, butyl rubber was called futile butyl, but with improvements it enjoyed wide acceptance for its low permeability to gases and its excellent resistance to oxygen and ozone at normal temperatures. During World War IIthe copolymer was called GR-I, for Government Rubber-Isobutylene. LINKS Related Articles Top of Form Polymers 1. Introduction Prior to the early 1920s, chemists doubted the existence of molecules having molecular weights greater than a few thousand. This limiting view was challenged by Hermann Staudinger, a German chemist with experience in studying natural compounds such as rubber and cellulose. In contrast to the prevailing rationalization of these substances as aggregates of small molecules, Staudinger proposed they were made up of macromolecules composed of 10,000 or more atoms. He formulated a polymeric structure for rubber, based on a repeating isoprene unit (referred to as a monomer). For his contributions to chemistry, Staudinger received the 1953 Nobel Prize. The terms polymer and monomer were derived from the Greek roots poly (many), mono (one) and meros (part). Recognition that polymeric macromolecules make up many important natural materials was followed by the creation of synthetic analogs having a variety of properties. Indeed, applications of these materials as fibers, flexible films, adhesives, resistant paints and tough but light solids have transformed modern society. Some important examples of these substances are discussed in the following sections. art 2. Writing Formulas for Polymeric Macromolecules The repeating structural unit of most simple polymers not only reflects the monomer(s) from which the polymers are constructed, but also provides a concise means for drawing structures to represent these macromolecules. For polyethylene, arguably the simplest polymer, this is demonstrated by the following equation. Here ethylene (ethene) is the monomer, and the corresponding linear polymer is called high-density polyethylene (HDPE). HDPE is composed of macromolecules in which n ranges from 10,000 to 100,000 (molecular weight 2*105 to 3 *106 ). If Y and Z represent moles of monomer and polymer respectively, Z is approximately 10-5 Y. This polymer is called polyethylene rather than polymethylene, (-CH2-)n, because ethylene is a stable compound (methylene is not), and it also serves as the synthetic precursor of the polymer. The two open bonds remaining at the ends of the long chain of carbons (colored magenta) are normally not specified, because the atoms or groups found there depend on the chemical process used for polymerization. The synthetic methods used to prepare this and other polymers will be described later in this chapter. Unlike simpler pure compounds, most polymers are not composed of identical molecules. The HDPE molecules, for example, are all long carbon chains, but the lengths may vary by thousands of monomer units. Because of this, polymer molecular weights are usually given as averages. Two experimentally determined values are common: Mn , the number average molecular weight, is calculated from the mole fraction distribution of different sized molecules in a sample, and Mw , the weight average molecular weight, is calculated from the weight fraction distribution of different sized molecules. These are defined below. Since larger molecules in a sample weigh more than smaller molecules, the weight average Mw is necessarily skewed to higher values, and is always greater than Mn. As the weight dispersion of molecules in a sample narrows, Mw approaches Mn, and in the unlikely case that all the polymer molecules have identical weights (a pure mono-disperse sample), the ratio Mw / Mn becomes unity. The influence of different mass distributions on Mn and Mw may be examined with the aid of a simple mass calculator. To use this device Click Here. Many polymeric materials having chain-like structures similar to polyethylene are known. Polymers formed by a straightforward linking together of monomer units, with no loss or gain of material, are called addition polymers or chain-growth polymers. A listing of some important addition polymers and their monomer precursors is presented in the following table. Some Common Addition Polymers Name(s) Formula Monomer Properties Uses Polyethylene low density (LDPE) -(CH2-CH2)n- ethylene CH2=CH2 soft, waxy solid film wrap, plastic bags Polyethylene high density (HDPE) -(CH2-CH2)n- ethylene CH2=CH2 rigid, translucent solid electrical insulation bottles, toys Polypropylene (PP) different grades -[CH2-CH(CH3)]n- propylene CH2=CHCH3 atactic: soft, elastic solid isotactic: hard, strong solid similar to LDPE carpet, upholstery Poly(vinyl chloride) (PVC) -(CH2-CHCl)n- vinyl chloride CH2=CHCl strong rigid solid pipes, siding, flooring Poly(vinylidene chloride) (Saran A) -(CH2-CCl2)n- vinylidene chloride CH2=CCl2 dense, high-melting solid seat covers, films Polystyrene (PS) -[CH2-CH(C6H5)]n- styrene CH2=CHC6H5 hard, rigid, clear solid soluble in organic solvents toys, cabinets packaging (foamed) Polyacrylonitrile (PAN, Orlon, Acrilan) -(CH2-CHCN)n- acrylonitrile CH2=CHCN high-melting solid soluble in organic solvents rugs, blankets clothing Polytetrafluoroethylene (PTFE, Teflon) -(CF2-CF2)n- tetrafluoroethylene CF2=CF2 resistant, smooth solid non-stick surfaces electrical insulation Poly(methyl methacrylate) (PMMA, Lucite, Plexiglas) -[CH2-C(CH3)CO2CH3]n- methyl methacrylate CH2=C(CH3)CO2CH3 hard, transparent solid lighting covers, signs skylights Poly(vinyl acetate) (PVAc) -(CH2-CHOCOCH3)n- vinyl acetate CH2=CHOCOCH3 soft, sticky solid latex paints, adhesives cis-Polyisoprene natural rubber -[CH2-CH=C(CH3)-CH2]n- isoprene CH2=CH-C(CH3)=CH2 soft, sticky solid requires vulcanization for practical use Polychloroprene (cis + trans) (Neoprene) -[CH2-CH=CCl-CH2]n- chloroprene CH2=CH-CCl=CH2 tough, rubbery solid synthetic rubber oil resistant 3. Properties of Macromolecules A comparison of the properties of polyethylene (both LDPE HDPE) with the natural polymers rubber and cellulose is instructive. As noted above, synthetic HDPE macromolecules have masses ranging from 105 to 106 amu (LDPE molecules are more than a hundred times smaller). Rubber and cellulose molecules have similar mass ranges, but fewer monomer units because of the monomers larger size. The physical properties of these three polymeric substances differ from each other, and of course from their monomers. à ¢Ã¢â€š ¬Ã‚ ¢ HDPE is a rigid translucent solid which softens on heating above 100 ° C, and can be fashioned into various forms including films. It is not as easily stretched and deformed as is LDPE. HDPE is insoluble in water and most organic solvents, although some swelling may occur on immersion in the latter. HDPE is an excellent electrical insulator. à ¢Ã¢â€š ¬Ã‚ ¢ LDPE is a soft translucent solid which deforms badly above 75 ° C. Films made from LDPE stretch easily and are commonly used for wrapping. LDPE is insoluble in water, but softens and swells on exposure to hydrocarbon solvents. Both LDPE and HDPE become brittle at very low temperatures (below -80 ° C). Ethylene, the common monomer for these polymers, is a low boiling (-104 ° C) gas. à ¢Ã¢â€š ¬Ã‚ ¢ Natural (latex) rubber is an opaque, soft, easily deformable solid that becomes sticky when heated (above. 60 ° C), and brittle when cooled below -50 ° C. It swells to more than double its size in nonpolar organic solvents like toluene, eventually dissolving, but is impermeable to water. The C5H8 monomer isoprene is a volatile liquid (b.p. 34 ° C). à ¢Ã¢â€š ¬Ã‚ ¢ Pure cellulose, in the form of cotton, is a soft flexible fiber, essentially unchanged by variations in temperature ranging from -70 to 80 ° C. Cotton absorbs water readily, but is unaffected by immersion in toluene or most other organic solvents. Cellulose fibers may be bent and twisted, but do not stretch much before breaking. The monomer of cellulose is the C6H12O6aldohexose D-glucose. Glucose is a water soluble solid melting below 150 ° C. To account for the differences noted here we need to consider the nature of the aggregate macromolecular structure, or morphology, of each substance. Because polymer molecules are so large, they generally pack together in a non-uniform fashion, with ordered or crystalline-like regions mixed together with disordered or amorphous domains. In some cases the entire solid may be amorphous, composed entirely of coiled and tangled macromolecular chains. Crystallinity occurs when linear polymer chains are structurally oriented in a uniform three-dimensional matrix. In the diagram on the right, crystalline domains are colored blue. Increased crystallinity is associated with an increase in rigidity, tensile strength and opacity (due to light scattering). Amorphous polymers are usually less rigid, weaker and more easily deformed. They are often transparent. Three factors that influence the degree of crystallinity are: i) Chain length ii) Chain branching iii) Interchain bonding The importance of the first two factors is nicely illustrated by the differences between LDPE and HDPE. As noted earlier, HDPE is composed of very long unbranched hydrocarbon chains. These pack together easily in crystalline domains that alternate with amorphous segments, and the resulting material, while relatively strong and stiff, retains a degree of flexibility. In contrast, LDPE is composed of smaller and more highly branched chains which do not easily adopt crystalline structures. This material is therefore softer, weaker, less dense and more easily deformed than HDPE. As a rule, mechanical properties such as ductility, tensile strength, and hardness rise and eventually level off with increasing chain length. The nature of cellulose supports the above analysis and demonstrates the importance of the third factor (iii). To begin with, cellulose chains easily adopt a stable rod-like conformation. These molecules align themselves side by side into fibers that are stabilized by inter-chain hydrogen bonding between the three hydroxyl groups on each monomer unit. Consequently, crystallinity is high and the cellulose molecules do not move or slip relative to each other. The high concentration of hydroxyl groups also accounts for the facile absorption of water that is characteristic of cotton. Natural rubber is a completely amorphous polymer. Unfortunately, the potentially useful properties of raw latex rubber are limited by temperature dependence; however, these properties can be modified by chemical change. The cis-double bonds in the hydrocarbon chain provide planar segments that stiffen, but do not straighten the chain. If these rigid segments are completely removed by hydrogenation (H2 Pt catalyst), the chains lose all constrainment, and the product is a low melting paraffin-like semisolid of little value. If instead, the chains of rubber molecules are slightly cross-linked by sulfur atoms, a process called vulcanization which was discovered by Charles Goodyear in 1839, the desirable elastomeric properties of rubber are substantially improved. At 2 to 3% crosslinking a useful soft rubber, that no longer suffers stickiness and brittleness problems on heating and cooling, is obtained. At 25 to 35% crosslinking a rigid hard rubber product is formed. The following illust ration shows a cross-linked section of amorphous rubber. By clicking on the diagram it will change to a display of the corresponding stretched section. The more highly-ordered chains in the stretched conformation are entropically unstable and return to their original coiled state when allowed to relax (click a second time). On heating or cooling most polymers undergo thermal transitions that provide insight into their morphology. These are defined as the melt transition, Tm , and the glass transition, Tg . Tm is the temperature at which crystalline domains lose their structure, or melt. As crystallinity increases, so does Tm. Tg is the temperature below which amorphous domains lose the structural mobility of the polymer chains and become rigid glasses. Tg often depends on the history of the sample, particularly previous heat treatment, mechanical manipulation and annealing. It is sometimes interpreted as the temperature above which significant portions of polymer chains are able to slide past each other in response to an applied force. The introduction of relatively large and stiff substituents (such as benzene rings) will interfere with this chain movement, thus increasing Tg (note polystyrene below). The introduction of small molecular compounds called plasticizers into the polymer matrix increases the interchain spacing, allowing chain movement at lower temperatures. with a resulting decrease in Tg. The outgassing of plasticizers used to modify interior plastic components of automobiles produces the new-car smell to which we are accustomed. Tm and Tg values for some common addition polymers are listed below. Note that cellulose has neither a Tm nor a Tg. Polymer LDPE HDPE PP PVC PS PAN PTFE PMMA Rubber Tm ( °C) 110 130 175 180 175 >200 330 180 30 Tg ( °C) _110 _100 _10 80 90 95 _110 105 _70 Rubber is a member of an important group of polymers called elastomers. Elastomers are amorphous polymers that have the ability to stretch and then return to their original shape at temperatures above Tg. This property is important in applications such as gaskets and O-rings, so the development of synthetic elastomers that can function under harsh or demanding conditions remains a practical goal. At temperatures below Tg elastomers become rigid glassy solids and lose all elasticity. A tragic example of this caused the space shuttle Challenger disaster. The heat and chemical resistant O-rings used to seal sections of the solid booster rockets had an unfortunately high Tg near 0  °C. The unexpectedly low temperatures on the morning of the launch were below this Tg, allowing hot rocket gases to escape the seals. Copolymers The synthesis of macromolecules composed of more than one monomeric repeating unit has been explored as a means of controlling the properties of the resulting material. In this respect, it is useful to distinguish several ways in which different monomeric units might be incorporated in a polymeric molecule. The following examples refer to a two component system, in which one monomer is designated A and the other B. Statistical Copolymers Also called random copolymers. Here the monomeric units are distributed randomly, and sometimes unevenly, in the polymer chain: ~ABBAAABAABBBABAABA~. Alternating Copolymers Here the monomeric units are distributed in a regular alternating fashion, with nearly equimolar amounts of each in the chain: ~ABABABABABABABAB~. Block Copolymers Instead of a mixed distribution of monomeric units, a long sequence or block of one monomer is joined to a block of the second monomer: ~AAAAA-BBBBBBB~AAAAAAA~BBB~. Graft Copolymers As the name suggests, side chains of a given monomer are attached to the main chain of the second monomer: ~AAAAAAA(BBBBBBB~)AAAAAAA(BBBB~)AAA~. 1. Addition Copolymerization Most direct copolymerizations of equimolar mixtures of different monomers give statistical copolymers, or if one monomer is much more reactive a nearly homopolymer of that monomer. The copolymerization of styrene with methyl methacrylate, for example, proceeds differently depending on the mechanism. Radical polymerization gives a statistical copolymer. However, the product of cationic polymerization is largely polystyrene, and anionic polymerization favors formation of poly(methyl methacrylate). In cases where the relative reactivities are different, the copolymer composition can sometimes be controlled by continuous introduction of a biased mixture of monomers into the reaction. Formation of alternating copolymers is favored when the monomers have different polar substituents (e.g. one electron withdrawing and the other electron donating), and both have similar reactivities toward radicals. For example, styrene and acrylonitrile copolymerize in a largely alternating fashion. Some Useful Copolymers Monomer A Monomer B Copolymer Uses H2C=CHCl H2C=CCl2 Saran films fibers H2C=CHC6H5 H2C=C-CH=CH2 SBR styrene butadiene rubber tires H2C=CHCN H2C=C-CH=CH2 Nitrile Rubber adhesives hoses H2C=C(CH3)2 H2C=C-CH=CH2 Butyl Rubber inner tubes F2C=CF(CF3) H2C=CHF Viton gaskets A terpolymer of acrylonitrile, butadiene and styrene, called ABS rubber, is used for high-impact containers, pipes and gaskets. For polyisobutylene at a glance, click here! Polyisobutylene is a synthetic rubber, or elastomer. Its special because its the only rubber thats gas impermeable, that is, its the only rubber that can hold air for long periods of time. You may have noticed that balloons will go flat after a few days. This is because they are made of polyisoprene, which is not gas impermeable. Because polyisobutylene will hold air, it is used to make things like the inner liner of tires, and the inner liners of basketballs. Polyisobutylene, sometimes called butyl rubber, and other times PIB, is a vinyl polymer. Its very similar to polyethylene and polypropylene in structure, except that every other carbon is substituted with two methyl groups. It is made from the monomer isobutylene, by cationic vinyl polymerization. And this is that monomer isobutylene: Usually, a small amount of isoprene is added to the isobutylene. The polymerization is carried out at a right frosty -100 oC, or -148 oF for you Americans out there. This is because the reaction is so fast we cant control it unless we freeze it colder than a brass toilet seat in the Yukon. Polyisobutylene was first developed during the early 1940s. At that time, the most widely used rubber was natural rubber, polyisoprene. Polyisoprene was an excellent elastomer, and easy to isolate from the sap of the hevea tree. Huge plantations thrived in Malaysia and grew hevea trees to supply the worlds rubber needs. There was only one slight problem, and that was that Malaysia had just been conquered by the Imperial Japanese Army, and wouldnt you know we just so happened to be fighting the Second World War against them right at that moment. Before the war was over more than sixty million people would be dead. Deprived of natural rubber, the Allied nations did some quick thinking and came up with PIB. It obviously worked, because the Allies won the war. Ok, we didnt actually invent polyisobutylene during the war. It had been invented long before the war by chemists in Germany. Theres irony! But it wasnt very useful until American chemists came up with a way to crosslink it. What they did was to copolymerize isobutylene with a little bit, say, around one percent, isoprene. This is isoprene: When isoprene is polymerized with the isobutylene we get a polymer that looks like this: About one or two out of every hundred repeat units is an isoprene unit, shown in blue. These have double bonds, which means the polymer can be crosslinked byvulcanization just like natural rubber. What is this vulcanization? To find out, click here. Stealing Vulcans Fire There was a time long past when the only rubber we had was natural rubber latex, polyisoprene. Straight out of the tree, natural rubber latex isnt good for much. It gets runny and sticky when it gets warm, and it gets hard and brittle when its cold. Tires made out of it wouldnt be much good unless one lived in some happy land where the temperature was seventy degrees year round. A long time agohow long, you ask? It was about a hundred and sixty years ago, 1839 to be exact. This was before there were any cars to need tires, but the idea of a useable rubber was still attractive. One person trying to make rubber more useful was named Charles Goodyear, a tinkerer and inventor, and by no means a successful one at this point. While goofing around in his kitchen with a piece of fabric coated with a m

Civic Education in Pakistan :: Educational School Governmental Essays

Civic Education in Pakistan Pakistan is a post-colonial nation-state. Since 1947 this large Muslim nation has not been able to introduce a liberal democratic model of civic education in its schools that could have promoted democratic values, tolerance, gender equality and civic participation skills. Several factors are responsible for impeding the progress in civic education: a garrison culture, the Cold War exigencies, religious extremism, and feudalism. Introduction Like most post-colonial nation-states Pakistan also recognized the central role of civic education in creating a patriotic citizenry. Paradoxically, as the civic education curriculum in government schools emphasized the construction of a distinct Muslim citizen identity, it eschewed the transmission of universal democratic values such as individual liberty, gender equality, critical thinking, and respect for religious and cultural diversity. By failing to recognize the utility and advantages of the basic principles of liberal democratic model of civic education, Pakistan suffered irreparable losses: it disintegrated into two countries, lost national unity and receded into the past (Jahan, 1972; Oldenburg, 1980). What may be responsible for thwarting the liberal democratic model of civic education in Pakistan is a question that warrants a careful examination. This paper argues that four independent variables kept the liberal democratic model of civic education curriculum at bay: the p rimacy of a garrison nation-state, the Cold War exigencies, religious extremism, and feudalism. The following is a discussion on the role of these four variables. A Garrison State First, Pakistan is a garrison state in that since its independence in 1947, it has been pre-occupied with national security (Jalal, 1991). Hence the main objective of civic education curriculum in schools has been the preparation of a warrior citizen (Binder, 1963). A warrior citizen or Mujahid is a person who is willing and prepared to participate in war or jihad against the infidels. To this end the social studies textbooks glorified the past Muslim warriors including Saladin Ayubi, an Arab warrior who fought the Crusaders in Jerusalem, Tipu Sultan who fought the British imperialists in India, and contemporary Pakistani military heroes who died in three wars against India. Moreover, because for most of its history the military ruled the country, the dominant social class in Pakistan has been the military (Cohen, 1984). The military is considered a privileged class and, therefore, military values of conformity, regimentation, and masculinity are underscored in society in general and in the educational institutions in particular.

The Public Reception of Mark Twains Adventures of Huckleberry Finn Ess

The Public Reception of Mark Twain's Adventures of Huckleberry Finn Upon its publication in 1884, Mark Twain's Adventures of Huckleberry Finn was met with mixed reviews. Some reviewers called it flat, trashy, and irreverent. Others called it Twain's best work yet, hailing his humor and style throughout the novel. Though obscure at first, reviews began to appear in many newspapers throughout the country as more and more became interested in the novel as a result of these reviews. Huckleberry Finn was published at a time when the nation was deeply concerned about the effects of literature on young minds. Dime novels appeared in abundance, and had moved from western stories to more modern stories, like those of Peck's Bad Boy and His Pa, published in 1883. The main character in these stories was a young prankster, who routinely succeeded in causing pain to adults, namely his father. Stories like these were considered dangerous to young boys who could model their behavior after the characters in the stories. Huck Finn was seen by many critics as another addition to the growing list of bad-boy stories published in the 1880's. The fact that it was written by an already well-known author added insult to injury for many. The attack on Twain's humor was immediate. The New York World published a review which said: Were Mark Twain's reputation as a humorist less well founded and established, we might say that this cheap and pernicious stuff is conclusive evidence that its author has no claim to be ranked with Artemus Ward, Sydney Smith, Dean Swift, John Hay, or any other recognized humorist above the grade of the author of that outrageous fiction, "Peck's Bad Boy." One critic in the Boston Evening Traveller called it "flat... ...ne of the strongest points of the novel is that it "teaches it lessons by implication, not by preaching; and literature is at it best when it is an imitation of life and not an excuse for instruction." The humor in the novel is also complimented, and it is this humor which contributes to the instructiveness of the novel. The review ends with the statement that the "story is capital reading." Huckleberry Finn was met with both positive and negative reviews when it was published. Those positive reviews praised the work of Mark Twain, encouraging the audience to read the novel. Those negative reviews also encouraged the audience to read the novel by stating the wickedness of it as a whole, therefore influencing people to read it just to see what it contained. Though for some novels mixed reviews mean smaller sales, for Huck Finn, every review lead to sales of novel.

The Skeletal System Essay examples -- Basic Pathology

The skeletal system includes the osseous tissues of the body and the connective tissues that stabilize or interconnect the individual bones. The bone is a dynamic tissue. Throughout the lifespan, bone adjusts to the physiologic and mechanical demands placed on it by the processes of growth and remodeling. Bone serves the organism at multiple levels: As a system, bones permit the organism to locomote effectively and to maintain posture by bearing loads without deformation, by providing rigid attachment sites for muscles and acting as a system of levers to amplify small movements. As an organ, bones protect the viscera and house the hemopoietic tissue (red marrow). As a tissue, bones serve as a reservoir of readily mobilizable calcium, an ion vital for many metabolic processes including cell motility, excitability, secretion, phagocytosis, intermediary metabolism, respiration, and reproduction. Bones (or osseous material) serve a number of diverse purposes in the human anatomy. In addition to providing structure, leverage, protection, and support for the organs of the body, bones also house marrow, which produces blood cells. Within the bones are also stored the calcium deposits which the body may access, via resorption, when needed. Additionally, bones detoxify the system, by removing heavy metals, such as lead and arsenic, as well as other toxins, from the bloodstream. The skeletal system provides structural support for the entire body. Individual bones or groups of bones provide a framework for the attachment of soft tissue and organs. Delicate tissues and organs are often surrounded by skeletal elements. The ribs protect the heart and lungs, the skull encloses the brain, the vertebrae shield the spinal cord, and the pelvis ... ...& J.W. Heath, Wheater ¡Ã‚ ¦s functional Histology, 4th edition, Churchill-Livingstone, New York, 2000, pp. 175-192. Johnson, Michael D. Human Biology: Concepts and Current Issues, Benjamin Cummings, San Francisco, 2001. Khosla, S., Kumar, V., Ramzi, S.C., Robbins, S.L. 1992. Basic Pathology, 5th edition. Philadelphia: W.B. Saunders Co. Manolagas, Starvros C. 2000. Birth and Death of Bone Cells: Basic Regulatory Mechanisms and Implications for the Pathogenesis and Treatment of Oteoporosis, Endocrine Reviews, 21(2): 115-137. Martin, B. 1993. Aging and strength of bone as a structural material, Calcified Tissue International, 53 (suppl.): S34-S40. Martini, Frederic. Fundamentals of Anatomy and Physiology, Prentice Hall, New Jersey, 1989. Raisz, Lawrence G. 1999. Physiology and Pathophysiology of Bone Remodeling, Clinical Chemistry, 45:8(B): 1353-1358.