The Biological Basis of Sleep

Introduction Sleep is a mental and physical state in which one becomes inactive and unconscious of the environment around him or her (Borbà ©ly, 2003). In the real sense sleep is just a partial disconnection from the world in which outside stimuli are obstructed from the senses. Normal sleep is indentified by a general reduction in most of the body functions including blood pressure, temperature, and the breathing rate. This is contrast to the human brain that never reduces in activity.Advertising We will write a custom essay sample on The Biological Basis of Sleep specifically for you for only $16.05 $11/page Learn More The brain is always active whenever a person is a wake or a sleep (Berger, 2007). A normal human being sleeps for eight hours. These eight hours are divided into two equal parts. The first part is the rapid eye movement, and the second is the non-rapid eye movement. The two parts form a cycle (Ishimori, 2004). The intention of this pape r is to look at the basis of sleep in relation to the biological mechanisms that cause people to sleep and stay awake. History of Sleep The history of sleep is believed to have been introduced by a psychologist professor at the University of Nagoya in Japan about one hundred years ago (Bayliss, 2006). The psychologist proposed a theory that explains the concept of sleep regulation. Kuniomi Ishimori and Heni Pieron neuroscientist state that, a hormonal chemical and not the neural network (Ishimori, 2004) cause sleep regulation. In earlier researches, researchers took some samples that were sterilized and dialyzed from dogs that had sleep then injected to the brains of the dogs that had no sleep. The dogs that received these samples fell after a short time. The scientists went ahead and took samples from normal dogs that did not have any sleep then introduced into the brains of other normal dogs without any sleep (Berger, 2007). The response showed that the recipient dogs did not slee p. This research indicated that there are substances that cause sleep known as â€Å"endogenous sleep-promoting substances.† Although the contradiction fact is that the nature of the chemical substances that caused sleep was not identified. Various research groups carried out their research and reported more than thirty endogenous sleep causing substances. In most cases, their physiological relevance was uncertain. Tokyo igakkai Zasshi from Japan published the first Ishimori’s paper entitled â€Å"true cause of sleep _ a hypogenic substance as evidenced in the brain of sleep deprived animals,† in the year 1909. Ishimori made further suggestion that when a person continuously stays a wake, it may also cause accumulation of factors that cause sleep in the brain (Borbà ©ly, 2003). Currently this is referred to as homeostatic sleep regulation. Starling and Bayliss discovered â€Å"scretin† in 1902. This is in relation with the existence of blood-borne messen gers. The new idea of hormonal control of the body functioning became quite fashionable and popular in those days.Advertising Looking for essay on biology? Let's see if we can help you! Get your first paper with 15% OFF Learn More Hans Berger a Germany neurologist in Jena invented an electroencephalogram (EEG) that records brain waves in 1920s. The discovery facilitated the qualitative and quantitative analysis of sleep. Until then, sleep was regarded as an unapproachable phenomenon mainly because it could not be explained scientifically. Kleitman and his coworkers discovered rapid eye movement (REM) sleep in Chicago. This discovery took place in the year 1953 in human beings (Bayliss, 2006). Jouvet and his group in Lyon identified that sleep is never a uniform phenomenon, and it consists of two main different stages. Sleep and wakefulness are the major complex, phenomena. Furthermore, sleep is divided into two parts: the REM and the non-REM sleep can easily be determi ned by examining the animal’s behavior (Berger, 2007). The authors suggest that it needs more accurate measurement of sleep and wake pattern by the use of the electrooculogram (EOG), the recording of the movement of the eye, EEG and (EMG) electromyogram, the recording of the tension of the muscles (Ishimori, 2004). When a normal, healthy person goes to sleep at eleven, the first step in sleeping starts with the NREM and then followed by the REM sleep. This makes a cycle in the sleeping pattern. As in the example, it all begins with the NREM that which progressively becomes deeper. It takes around four to five cycles in which one take about 90 minutes; arousal comes after the concluding REM sleep (Borbà ©ly, 2003). This principle has been in existence for a long time and yet the physiological regulatory mechanisms and the meaning have completely remained a mystery. Alexander Borbely from the Zurich University in Switzerland came up with his two famous process model that show sleep regulation in 1982. He argues that homeostatic process is entirely controlled by sleep pressure or sleep propensity that build up during the wakefulness period. The process is related to the Ishimori’s thus the name Ishimori-Pieron type. On the other hand, a biological or pacemaker clock that is independent of the prior waking and sleep determines the circadian process well known as the sleep-wake sequence during the night and day. This clock is found in the body of the animals. Researches indicate that Ultradian process can generate alternation of REM and NREM sleep (Pià ©on, 2003). From a scientific point of view, the molecular mechanisms that explain the sleep- wake regulation in all the processes have remained unknown.Advertising We will write a custom essay sample on The Biological Basis of Sleep specifically for you for only $16.05 $11/page Learn More Sleep and Prostaglandin Prostaglandins (PGs) are the lipid mediators (Bayliss, 2006 ). There are more than thirty kinds of prostanoids, which are known worldwide. The compounds are distributed extensively in all mammalian organs and tissues. They have a diverse and numerous biological effects on various pathological and physiological activities in the body, and that is why they are sometimes called local or tissue hormones. In 1980s, the scientists discovered the most common prostanoid in the mammalians and mostly the rats and human beings (Berger, 2007). According to their findings, they suggest that PGD2 can be a distinctive component of the brain and might be having some essential function in the organ. They found out that when PGD2 cause sleep to rats when it is microinjected in the brains (Pià ©on, 2003). This was a notable achievement, and they decided to carry on with the study to the molecular mechanism and the physiological significance. Inoue and Honda from Tokyo Japan first designed the bioassay analysis system for sleep. The analysis of the structure i s as follows: through microinjection pump, the chemical PGD2 is injected gradually and constantly through a cannula which is chronically rooted in the 3rd ventricle of a rat . The stages that the rat undergoes to sleep are determined using polygraphic recording of EMG and EEG. Other aspects like food intake, water intake and brain temperature, are monitored and the general behavior of the rat is recorded using a video recorder under infra-red light. The rats are nocturnal animals that sleep most of the daytime, and remain active during the night. The outcome of the research showed that when the PGD was constantly injected in the third ventricle of a rat, the REM and the NREM sleep improved significantly during injection time. PGD2 caused the effect since the other PGs were ineffective (Borbà ©ly, 2003). The experiment mostly depended on the dose and the little picomolar quantity of PGD2 given to per minute it was enough to cause excess sleep to the rat. The quantity of the PGD2 tha t required causing sleep corresponded quite closely to the normal concentration inside the brain (Pià ©on, 2003). The results indicated that pharmacologically high doses are not necessary, and it can imply that the difference in the concentrations of PGDs which ordinarily occur in the brain have the ability to control sleep under physiological circumstances (Berger, 2007).Advertising Looking for essay on biology? Let's see if we can help you! Get your first paper with 15% OFF Learn More The most important aspect is that the PGD2 stimulated sleep was the same as the physiological sleep just as shown by electrophysiological principle and conduct that involves power spectral data. Contrary to PGE2, the PGD2 is never pyrogenic, but in the real sense, it caused little amounts of reduction in temperature as seen to happen throughout the physiological sleep (Ishimori, 2004). Others experiments, that were carried out, in Japan with monkeys, Mocaca mulatta, indicated clearly that PGD2 could induce natural or physiological sleep (Bayliss, 2006). The sleeping pills and drugs cause quite different sleep from the physiological sleep or the natural one. This shows that PGD2 is a true sleep hormone. Sleep-wake regulation The discoveries in the experiments above explain how sleep can be introduced to an animal from the beginning until it gets into a deep sleep. Then the next part is to identify if the same experiment can apply in the process of waking up the animal from the sleep explaining the wake sleep process. Philos published the brief summary of the experiment in the year 2000. The article observes that the main enzyme that induces sleep is mainly found in the arachnoid membrane and the choroid plexus. After this enzyme is generated, PGD2 is secreted into cerebrospinal fluid (CSF) and then flows inside the subarachnoid and ventricular spaces. The PDG receptors known as the DPRs are localized on the little area on the ventro-rostral plan of the basal forebrain. PGD2 that circulates in the CFS binds the receptors at the point where the sleep signal is generated (Pià ©on, 2003). The signal passes through the parenchyma brain to the ventrolateral preoptic area VLPO), which is a centre for sleep, across the pia membrane (Ishimori, 2004). The process is mediated through adenosine by A2A adenosine receptor. VPLO cast to the tuberomammilary centre (TMN) (Berger, 2007). The scientists, Oishi and coworkers, found out that adenosine from the TMN cause sleep by h indering the histamnergic structure via A1 receptor (Bayliss, 2006). This implies that PGD2 induce sleep by facilitating the functioning of sleep neurons (Borbà ©ly, 2003). On the same point, wake materials like orexin or PGE2 thruogh the histamine mechanism support an organisms’ wakefulness. According to the scientists, it is their view that the work on wakefulness still requires great attention and it forms the basis of greater basis for more investigation. Stages of sleep Sleep has four main stages. It starts from dozing and continuously progresses into a unusually deep sleep. Stage one The stage is can be termed as a doing stage. In this stage, five percent of the non-REM is spent. It is the transitional phase of the exact light sleep. The birthing rate, and the muscles start to relax and a person can be easily awakened (Berger, 2007). A person may feel a hypnic jerk during this period, the tendency to fall asleep and come back easily. After the rush of activities, the b ody starts to get into a slight slumber. The EEG at this stage is low, and the eye movements are slow. The eyes roll slowly as though closing and opening. Stage two This is the official onset of a consolidated sleep. A bout forty-five percent of the non-REM sleep is covered in this step (Pià ©on, 2003). The eye movement stops then the brain waves enlarge. There are two distinct brain waves in this stage, K-complexes and spindles (Borbà ©ly, 2003). A sleep spindle is a design by which EEG waves that consist of a burst of eleven to fifteen hertz wave that last from five to fifteen seconds. A K complex has quite a high voltage of EEG activity. It consists of a sharp downward constituent then followed by a slow upward constituent. This pattern lasts for over five seconds. Stage three As the sleep advances deeper and deeper, it becomes extremely difficult to arouse someone at this stage. An individual may spend about twelve percent of the non-REM sleep in stage three. Real slow wave sl eep starts with slow and large wave in amalgamate little, faster ones. Stage four This stage is normally characterized by extremely deep sleep. It mostly spends round seventy-five percent non-REM sleep, and thirteen percent of this part is spent in the last stage (Berger, 2007). An individual in the last two stages is more difficult to wake than an individual who is in the first two stages (Bayliss, 2006). People who wake up from sleep normally feel disoriented and groggy for some time. REM sleep This is the period that a person may experience dreams. During this time, there is an irregular breathing, periodic eye flattering, there is also an irregular heart rate, blood pressure and body temperature. This makes a difference between non-REM and REM sleep stages (Ishimori, 2004). In other words, the REM is referred to as paradoxical sleep since brain wave activities is almost similar to a wakened state. During this stage, the brain obstructs all signals towards the muscles and they re main immobile so that the dreams cannot be acted out (Pià ©on, 2003). Most adults spend a round twenty to twenty-five percent of their sleep in REM. Conclusion The biological basis of sleep is dated back to more than one hundred years ago. Kuniomi Ishimori and Heni Pieron laid the foundation of sleep through their research done in Japan. The later physiologists identified that sleep can be classified into two main groups. These are the REM and the non-REM (Bayliss, 2006). All the two parts come in different stages, that is beginning from stage one up to stage four, all the stages follow one another from the beginning of sleep to the time a person wakes up. There is still more room for other scientists to make the research and prove the sleep phenomenon. Top of page Abstract HISTORICAL INTRODUCTION PROSTAGLANDIN (PG) AND SLEEP PROSTAGLANDIN (PG) D SYNTHASE, THE KEY ENZYME IN SLEEP REGULATION MOLECULAR MECHANISMS OF SLEEP–WAKE REGULATION BY PGD2 AND E2 ROLE OF PGD2 IN THE CIR CADIAN PROCESS THE ROLE OF PGD2 IN THE HOMEOSTATIC PROCESS HUMAN EXPERIMENTS IN SUMMARY ACKNOWLEDGMENTS CONFLICT OF INTERESTS REFERENCES References Top of page Abstract HISTORICAL INTRODUCTION PROSTAGLANDIN (PG) AND SLEEP PROSTAGLANDIN (PG) D SYNTHASE, THE KEY ENZYME IN SLEEP REGULATION MOLECULAR MECHANISMS OF SLEEP–WAKE REGULATION BY PGD2 AND E2 ROLE OF PGD2 IN THE CIRCADIAN PROCESS THE ROLE OF PGD2 IN THE HOMEOSTATIC PROCESS HUMAN EXPERIMENTS IN SUMMARY ACKNOWLEDGMENTS CONFLICT OF INTERESTS REFERENCES Bayliss, W.M. (2006). Starling EH. The mechanism of pancreatic secretion. J. Physiol. Chicago: Harvard Publishers Berger, H. (2007). ÃÅ"ber das Elektrenkephalogramm des Menschen. J. Psychol. Neurol. Chicago: Harvard Publishers Borbà ©ly, A.A. (2003). Two process model of sleep regulation. Hum. Neurobiol. New York: Macmillan Publishers Ishimori, K. (2004). True cause of sleep – a hypnogenic substance as evidenced in the brain of sleep-deprived animals. Tokyo: Igakka i Zasshi. Pià ©on, H. (2003). Le problà ©me physiologique du sommeil. Paris: Masson et cie. This essay on The Biological Basis of Sleep was written and submitted by user Amelie A. to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

The notion

The notion that man could fly or someday would be able to achieve flight has long since been an idea of man for literally centuries. As early as 400 BC, a Greek scholar by the name of Archytas built a wooden pigeon that moved through the air. Approximately 100 years later the Chinese developed kites, which are a form of gliders, which much later in history, allowed humans to fly in them (1). Mans first attempts at flight later progressed with designs by Leonardo daVinci. DaVinci's design was based on a flapping type wing, Givanni Borelli stated that a human's muscles were far to weak to flap the large surfaces needed to obtain flight and that the physical make up of humans would not be that which could be used in flight with such inventions. Glider flights later came to be through the inventions of a British inventor by the name of George Cayley. Cayley founded the study of Aerodynamics and was the first to suggest a fixed wing aircraft with a propeller. Cayley's invention led Otto Lilienthal to gliders that could be piloted by men up to heights of 100 feet or more, consequently Lilienthal was killed by his own invention during a flight. He broke his spine, and he died a day later in a Berlin hospital. There is some feeling that had Lilienthal lived, he might have beaten the Wright brothers to the punch. Although many believe that the Wright brothers were the firs! t to achieve flight there were those before them that actually made attempts at powered flight. William Henderson patented plans for the first plane with a engine, fixed wings and a propeller, coincidentally after one try he gave up. Inventors following Henderson came up with they're own variations of his design of which by all accounts failed, although they were airborne for a short duration they never achieved sustained flight. Since the early inventions of flight the technological advances along with the better understanding of aerodynamics has allowed airplanes t...

Rating Sites Essay Example | Topics and Well Written Essays - 750 words

Rating Sites - Essay Example So the reader has to use his own intelligence and judge for himself if the posting is genuine or false. Pfeiffer concludes that as the traffic to these rating cites increase, we will be forced to think of closing the anonymous rating sites. Although the rating sites can be abused, they can also give us useful information. Instead of trying to close the rating sites, we should do something to make the rating sites more responsible and truthful. According to Pfeiffer, the phenomenal success of sites like RateMyProfessor.com and RateMyTeacher .com, other rating sites sprang up, which rate different things. There is now a huge network of online forums which rate professionals like doctors and lawyers, and services like car repair, plumber service and childcare centers. Even entertainment centers like nightclubs are rated. All the rating can be done anonymously. The public gets enormous amount of information about any service they want. This helps them to choose a lawyer or doctor, or a service provider, which suit them. The sites may be giving genuine information, or just be misleading the users. The critics of the system say that clients who are angry or dissatisfied can post a malicious comment about any person or service. Similarly, bad tempered students can post an ugly comment on the teacher. Envious colleagues and estranged friends or relatives can post malicious comments. Malicious persons might post comments suggesting malpractice, about a lawyer or doctor. According to Professor Michael Rustad of Suffolk University Law School, who specializes in Internet Law, many of the rating sites are just platforms for getting rid of their strong emotions, for some persons. Rustad further states that "they are not random samples of how this professor or lawyer or doctor is doing." On the other hand, the person concerned can post excellent comments on himself. Since the sites are anonymous, there is no accountability. Fraud can be detected and removed Internet entrepreneur Bob Nicholson recognizes the problem of abuse of the sites. Calling the rating cites "magnets of abuse", he says that internet users should take the information they get from these sites "for what it's worth." If there are many comments coming from the same Internet address, it points to fraud, where a doctor or lawyer might be generating the comments himself. Similarly, if there are many comments which use similar sentences or phrases, it would mean that the same person is writing the comments in different names. The sites screen such multiple ratings. Online service providers are protected from being dragged into lawsuits over materials posted by third parties, by the Federal Communications Decency Act. Most of the rating sites bar only obscene and racist comments, and allow everything else. The online users are sure of anonymity on the Internet. It is only because of the anonymity that we have useful sites such as Craig's List and Amazon's user feedback. If there is no anonymity for the user, the nature of Internet itself would change. Kurt Opsahl, a staff attorney for the Electronic Frontier Foundation, a nonprofit San Francisco digital rights group, argues that if some people think that they have been misrepresented, they can

Chest Pain Clinical Examination Essay Example | Topics and Well Written Essays - 1500 words

Chest Pain Clinical Examination - Essay Example This can be done mainly through eliciting the history in fair detail. As a nurse practitioner in the community, I will be facing many cases of chest pain. Recently I had to manage such a case and I believe that the experience has equipped me with confidence. I adopted a structured approach to evaluate the case and progress through a mental checklist for eliciting the essential historical details (Reigle, 2005). The collected relevant data helped the decision- making and subsequent management. Case Presentation Respecting the confidentiality and privacy of the patient, I met her in the emergency department where I was working. With her consent, as she was conscious and answering, I elicited the history of the chest pain from Mrs John. Mrs John, 81 years old and weighing 85 kg., had been brought to the Emergency Department by her son. I followed the mnemonic TROCAR for eliciting the history of the presenting complaint of chest pain. She had a sudden but mild chest pain while she was in bed. Time of onset was when she woke up with it at 6a.m. and first dismissed it as indigestion. As it was not giving way after her antacid liquid, she called her son. Also experiencing shortness of breath, the duration of pain had lasted for the past forty minutes. Mrs. John had fatigue since the previous night, something she was not accustomed to. Radiation of the left-sided chest pain was to the back. Onset was sudden. The character of the pain was a dull aching sensation. There was no particular aggravation or relief. The severity remained constant as a dull pain. It was a left sided chest pain. The excessive sweating worsened her fatigue. She was reluctant to go to hospital but her son insisted on it. She had then been brought to my department where I was on duty. Past History revealed that she had been a hypertensive on treatment for the past twenty years. There was a history of irregularity in treatment at times. The mild senile dementia with partial loss of memory that the l ady suffered from was the cause of the irregular treatment. Now her son was in charge of giving her the medicine. She became diabetic fifteen years ago and was on oral anti-diabetics since then. Seven years ago she had a fall injuring her left trochanter which was managed accordingly. She now walks with a limp. There was no history of allergies but she had been taking antacids on and off presumably for acid-peptic disease. Smoking was not her weakness and she had not travelled for a long time. Before retirement she was working as a personal secretary in an industrial concern. Family history revealed that two brothers had died of myocardial infarction but at a later age of around 85 years. Obesity was in the family too. Mrs. John’s mother had diabetes and died of renal failure. Nursing care plan This has been elaborated upon the mnemonic ADPIE (assessment, diagnosis, planning, implementation and evaluation). Assessment On inspection, obviously obese Mrs. John appeared dyspnoei c taking short breaths with the respiratory rate being 28 per minute but regular. Her heart rate was 90 per minute and irregular at times due to ectopic beats. Her supine blood pressure was 200/120mm Hg. Palpation of abdomen did not reveal any abnormalities. Percussion ruled out fluid in the chest or abdomen. Auscultation elicited an irregular heart and tachypnea. During the general physical examination, I enumerated and eliminated non-cardiac causes; her symptom details helped me to distinguish her illness

Knowledge Intensive Firms and Knowledge Workers Research Paper

Knowledge Intensive Firms and Knowledge Workers - Research Paper Example Southern power continues to find opportunities to implement its strategy of creating value through its numerous transactions such as asset acquisition and selling, establishment of novel power plants, entrance into Power Plants Associations mostly with other investor-owned utilities, municipalities, independent power producers, and electric cooperatives (Google Finance, 2015, p. 1). In Southern Co’s operations, FERC plays the crucial role of providing the operation regulations instead of following traditionally defined state regulations like any other traditional operating company. Though operating as one large company, the Southern Company operates under several leveraged leases such as Southern LINC Wireless that offers digital wireless communications for Southern Co.’s uses. For purposes of this paper, the evaluation Southern Company is limited to company’s proactive approach to preparing for disaster recovery. For a long time, Hurricane Katrina has been known for its numerous complex challenges such as 100% loss of power for customers, 65% of power delivery system damages, 97% loss of power generation capacity, approximately 9,000 damaged or damaged power poles, transformer damages, 100% dilapidated corporate offices, and more than half of the residents suffering noteworthy damages for their homes (Ward, 2006, pp. 7-13). Other challenges experienced during the Katrina hurricane are communication loss and devastation infrastructure. Through its investment and prioritization of knowledge base management, Southern Co. effectively planned on eliminating the challenges associated with the Katrina Hurricane through approaches such as a reduction in the time duration required to restore power to its customers, provision of family services, assisting emp loyees with personal losses, and daily provision of thousands of fuel gallons daily.

Components of Effective Teamwork

Components of Effective Teamwork There are many components of effective teamwork such as communication, cohesiveness, commitment and collaboration among members to confronting problems directly, coordinating efforts, managing conflict and making decision via consensus, which requires some time compromisation (Heineman,1994). According to Zander,1994,team goal are desirable state of affair members intend to bring about through combined effort. A clear understanding of groups objective through well-articulated goals is the most common characteristic of successful team (Larson and LaFasto, 1996).The team member had never been together before the assignment given. The team established a common purpose that is decided to complete the given task with the allocated time. The team member was randomly selected and joined together, the members undergo the 5 stages Tuckman theory, accomplishing group assignment.In every team, there are team composition needed for a team to work well. According to Guzzo Dickson (1996), composi tion refer to the nature and attributes of team members.Whereas there are large and small groups or team within organization, the important point the composition of the groups or teams. According to Hackman, 1987 the effective team need members who have relevant expertise, interpersonal skills and moderate differences in their background. In a way, there is no point of including many people into a team or group if they do not have complementary relevant skills to contribute to teams goals. Other than that, in many group or team, what generally happen is that individual get appointed onto team where they feel they are wasting their time in the meeting rather than being a contributing member. Thus, it is imperative that a team has combination of the right mix of workforce, expertise right people skills. In discussion of the group assignment, there are different value embed in three main ethics in this group(Malays, Chinese and Indians) including non-assertive, good manners, cooperati on and harmony; trust and relationship building. These values will to some extent influence group norms and cohesiveness (Abdullah and Low, 2001). Apart from that, it is imperative that members understand their roles in their teams or groups. Roles are expected behavior pattern attributed to someone occupying a given position in a social unit (Robbin Judge, 2007).There are many roles that member that members can play within their team or group. According to Margerison and McCann (1990), there are nine roles commonly played by group. Robbin and Judge nine roles include Linker, Creator, Promoter, Assessor, Organizer, Producer, Controller, Maintainer and the Advisor. Each team role has particular strengths wan weakness which is essential for team member to identify themselves and more importantly they need to match the roles with their skills and preference for compensating each other weakness with their strength. Moreover, cohesiveness will bring about positive effect to satisfaction and communication. In teamwork context, it is important that all team members build cohesiveness through understanding and respects of each others roles and contribution trying to accomplish the group task and goals. People who are part of cohesiveness groups are more satisfied than are member of non-cohesive group(Hackman1992).Group cohesion also helps to reduce stress because members are supportive to each other .Effective team work have norms that support high quality performance and a level of group cohesiveness that provide social support to its members. Effective leaders are those who personal qualities enable them to articulate a vision for a given group. It is therefore important that the leader, by his [or her] behavior manifest a loyalty to the needs and aspiration of group members. These things must matter to him [or her] in ways that to view because such evidence of good faith sincere accessible serve to elicit greater acceptance of influence. ( Hollander,1964,pg231;). In addition, Hollander found that, In order the group to function as effectively as possible, the leader needs to be attuned to the need of followers, the perception and expectancies,(1995,pg75).In other words, when followers trust a leader, theyre willing to be subjected to the leader actions, for they are convinced that their rights and interest will not be neglected. Besides effective leadership, an affective membership is also important to achieve successful teamwork. Team membership performs its task then is better able to perform the next task assigned to it. The main reason in forming a team is to complete given task. Not only that, it is also helping maintain good social relations, promotes its members personal and professional development. Therefore, it is essential for member require the right type of people, good internal group process and understand team dynamic to work towards a common goal. This is the social relations, group maintenance, or viability aspect of teamwork (Sundstorm, 1990).For creating effective membership, there is necessary diversity of knowledge and skills. Management teams with members of different backgrounds are more innovative that homogenous team. (Guzzo and Dickson, 1996)

The Olympic Games :: Olympics History Greek Olympia Essays

The Olympic Games The Olympic Games are an international sports festival that began in ancient Greece. The original Greek games were staged every fourth year for several hundred years, until they were abolished in the early Christian era. The revival of the Olympic Games took place in 1896, and since then they have been staged every fourth year, except during World War I and World War II. Perhaps the basic difference between the ancient and modern Olympics is that the former was the ancient Greeks' way of saluting their gods, whereas the modern Games are a manner of saluting the athletic talents of citizens of all nations. The original Olympics featured competition in music, oratory, and theater performances as well. The modern Games have a more expansive athletic agenda, and for two and one-half weeks they are supposed to replace the rancor of international conflict with friendly competition. In recent times, however, that lofty ideal has not always been attained. The earliest reliable date that recorded history gives for the first Olympics is 776 BC, although virtually all historians presume that the Games began well before then. It is certain that during the midsummer of 776 BC a festival was held at Olympia on the highly civilized eastern coast of the Peloponnesian peninsula. That festival remained a regularly scheduled event, taking place during the pre- Christian golden age of Greece. As a testimony to the religious nature of the Games, which were held in honor of Zeus, the most important god in the ancient Greek pantheon, all wars would cease during the contests. According to the earliest records, only one athletic event was held in the ancient Olympics--a foot race of about 183 m (200 yd), or the length of the stadium. A cook, Coroibus of Elis, was the first recorded winner. The first few Olympics had only local appeal and were limited to one race on one day; only men were allowed to compete or attend. A second race--twice the length of the stadium-- was added in the 14th Olympics, and a still longer race was added to the next competition, four years later. When the powerful, warlike Spartans began to compete, they influenced the agenda. The 18th Olympics included wrestling and a pentathlon consisting of running, jumping, spear throwing, discus throwing, and wrestling. Boxing was added at the 23rd Olympiad, and the games continued to expand, with the addition of chariot racing and other sports. In the 37th Olympiad the format was extended to five days of competition. The growth of the Games fostered "professionalism" among the competitors, and the Olympic ideals waned as royalty began to compete for personal gain,