Role of Mentor in Evaluating Student Learning Essay

Role of Mentor in Evaluating Student Learning - Essay ExampleNMC (2008) emphasizes that qualified mentors be equipped with certain qualities which abets them to facilitate learning and assess students in practice settings. Some of these qualities as defined by Kerry and Mayes (1995) are role modelling nurturing place capable of enhancing professional competencies of mentee and building constructive relationship not only as teacher, friend or counsellor but as one of carer that is prolong over a period of time. The mentors exert extensive influence on the learners and often act as role models for them. Consequently, the moral responsibilities of mentor are significantly more pronounced. Most importantly, in the era of fast globalization, ethical considerations and moral obligations become critical factors in healthcare industry and effective mentoring helps to inculcate and erect ethics within their profession. As per NMC (2008), mentoring involves eight major roles as precept or assessor clinical educator clinical supervision clinical supervisor go for teacher registrant, supervisor. Preceptor primarily has basic minimum qualification of atleast twelve months experience in the desired area.UK government provides the facility of preceptors to all new nurses to help them to become dedicated registrants. While assessor is equipped with necessary skills to assess students competencies, Clinical educators, clinical supervision and clinical supervisor help the nursing students to elicit their skills in clinical setting through effective feedback. Waskett (2010) believes that it helps the students to become confident and acquire skills that improve their performance. The rest of the roles of mentor differ with different areas in healthcare and medical environment. Hawkins and Shohet (2006) assert that supervisors as mentors are important as they help

Federalist No. 69 and the Executive Branch Essay

Federalist No. 69 and the Executive Branch - Essay ExampleA government consists of three branches the Executive, the Legislative, and the Judicial. The electric chair of America has the right to revisit a bill, which undergoes two of the branches and forms into a law if approved by two-thirds of the people from both houses. On the contrary, the King of Britain has an absolute negative regarding approval from the houses. This natur thaty means agitation both from the sevens and the public before a law is implemented alternatively by play than force. This authority is only invested in the King and not the President. Then Hamilton states four concrete points of difference between the King and the President 1. The President has the authority to command the militia occasionally unlike the King of Great Britain and the governor of New York, who can command the whole militia at all times remaining in their numerous jurisdictions. Hence the power of the President is second-rate as compar ed to the other two. 2. It is the duty of the President to be commander-in-chief of the United States soldiers and navy. This article brings the President on equal grounds with the King and the governor, however lesser in substance. The President cannot declare war or regulate fleets and armies. tho the legislature has this authority. 3. The President can pardon call cases except for the impeachment case. This is not the case with the governor of New York who can even deal with the impeachment cases except for black lotion and treachery. This is aggressively questioned by Hamilton for its undeserving distribution of power vested in the President. 4. The King of Great Britain and the governor of New York respectively have the influence to disband the Parliament or the legislature of the State which may be a purposeful control employed by the governor in certain delicate matters. The President, however, mud at the level of just adjourning only the national legislature under a sing le case of disagreement circumstance (Hamilton, 1992). These differences have been pointed out to break the real character of the executive, the President of the United States, who may not be compared to the King of Great Britain, not even the governor of New York. In reality, the U.S. Constitutions only recently gained power as the American Legislators made a conscious effort to regain the executive branch through the trust of the people. The President is the magistrate elected by the people of the United States. He is not completely independent because he is chosen for four geezerhood through fair elections (Tocqueville, 1945). The power as it is seen in the constitution did not exist prior to the introduction to the Constitutions of the United States. The people lived under the Articles of Confederation, which did not have an executive branch and it lasted for forty years (Prince, 1867). It was considered weak without the executive branch.

Advanced Marine Design Coursework Example | Topics and Well Written Essays - 750 words

Advanced Marine Design - Coursework ExampleSubstantial modifications have been installed in the design to include the hull form characteristics and standard dimensions to iterate genuine design arrangements. This marine craft is a high-speed aluminum planing hull with standardised screw diesel thrust and heavy buildup. The key facets that have been well-thought-out in the designing procedure of the craft include the effects, needs, dimensional ratios, form features, resistance, propulsion and strength of the ship and its outline (Mizine, Brenner and Harries, 2011, p. 1). Corresponding dimensional ratios I. Influences Increasing anxiety over the creation of the general design of the marine craft, its incorporation, with production, sustenance and renovation has created specific attention (Mizine, Brenner and Harries, 2011, p. 1). This focus influences the functions and needs of automatic designs and production, and the application of information technology aspects. establishment of computerized instruments has made this design employ the attempt of enhancing the design guidelines with the aim of advancing the makeance and security of the ship and its structures. The depiction of the hull configurations for such a high-speed marine crafts is the most significant aspect that greatly influences all stages of the design project (Mizine, Brenner and Harries, 2011, p. 1)... This mainly applies for traditional marine crafts that make this design appear and perform as a modern and improved structure of traveling and warring purposes (Mizine, Brenner and Harries, 2011, p. 2). III. Principle dimensional ratios The accompanying dimensional ratios have been recognized with a broadcast that gets a grip of the function played by the three-dimensional computer displaying in current ship design exercise. This exercise involves training in legion(predicate) current utilized three-dimensional project apparatuses like the current design (Mizine, Brenner and Harries, 2011, p . 2). To get to the opening principle features of the ships design structure, a database of similar vessels were covered. To commence the design, it was already established that planing hulls need a coefficient of velocity (CV) of 2, Savitsky, operating under the theory of Hydrodynamic Design of Planing Hulls. The marine technology used in this design also employs a cruising velocity that is supposed to be approximately 30 knots. Using these values and the theory that establishes Savitskys equation CV = V/ (g*B).5 A distance of 20 feet was initiated for the marine crafts beam. Afterwards, the equation was deployed to control this measurement L = 9.8489*B 91.585 = 105 feet Knowing the length, the relationship shown in the design was used to realize the displacement ? = 2.2244*L 120.01 = 113.55 LT Lastly, from the calculation, a value for the current was realized ? = 56.857*T 253.56 T = 5.5 feet Consequently, preliminary principal dimensions were as follows L = 105 feet B = 20 feet T = 5.5 feet IV. Form characteristics on stability Certain incorporation techniques, Bonjean curves, dampened exteriors and

Investment and Selling Price Essay Example for Free

Investment and Selling Price EssayTurnhilm, Inc. is considering adding a small electric mower to its harvest-tide line. Management believes that in order to be competitive, the mower cannot be priced above $139. The company needs a minimum return of 25% on its investings. Launching the parvenu product would require an investment of $8,000,000. Sales are expected to be 40,000 units of the mower per year.Required Compute the tooshie live of a mower. 57. The management of Hettler Corporation would like to muckle the selling price on a new product using the absorption costing approach to cost-plus pricing. The companys accounting department has supplied the following estimates for the new product Management plans to produce and sell 4,000 units of the new product annually. The new product would require an investment of $643,000 and has a required return on investment of 20%. Required a. Determine the unit product cost for the new product. b.Determine the markup percentage on absorption cost for the new product. c. Determine the target selling price for the new product using the absorption costing approach. 58. Bourret Corporation is introducing a new product whose reign over materials cost is $42 per unit, direct labor cost is $16 per unit, variable manufacturing overhead is $9 per unit, and variable selling and administrative expense is $3 per unit. The annual fixed manufacturing overhead associated with the product is $84,000 and its annual fixed selling and administrative expense is $16,000.Management plans to produce and sell 4,000 units of the new product annually. The new product would require an investment of $1,022,400 and has a required return on investment of 10%. Management would like to set the selling price on a new product using the absorption costing approach to cost-plus pricing. Required a. Determine the unit product cost for the new product. b. Determine the markup percentage on absorption cost for the new product. c. Determine the t arget selling price for the new product using the absorption costing approach.

Why Britain reduced its Empire between 1939 and 1964 Essay Example for Free

Why Britain reduced its Empire between 1939 and 1964 EssayAssess the reasons why Britain reduced its Empire between 1939 and 1964In 1945 the help World War ended, the next thirty long time were to see rapid disintegration of the European empires and the creation of numerous new independent states. In this evidence I will attempt to explain for what reasons Great Britain decolonised, and the effects this decolonisation had for those countries decolonised.As a result of victory after(prenominal) WWI several former German territories in Africa and Asia were added to the British Empire. The British Empire was among the largest Empires the world had ever seen. It consisted of various territories conquered or colonised by Britain from ab out(p) 1600. The British Empire was at its largest at the end of WWI, consisting of over 25% of the worlds population and area including countries such as India, Malaya, Kenya, Ghana, Cyprus, Greece, New Zealand.World War I brought the British Emp ire to the peak of its expansion, simply in the years that followed came its decline. Britain had growing economic problems and couldnt afford to continue governing its enormous Empire. There were nemesiss of Civil War in countries such as India the threat of the ranch of Communism from China into Malaya and the increasing problem of racism and prejudice in Britains African colonies.The Empire faded gradually into the Commonwealth from the 1930s frontward as one by one former British colonies and protectorates murdered freedom but retained this last link with the Crown. It was incredibly important for Britain to retain its calling links with countries that were/had been part of its Empire. Britain needed to change the face of its Empire, one reason for such a change was due to the view of the U.S they were opposed to Empires and Britain did not fatality the Anglo-American relationships to even slightly grow apart.At the beginning of end of the Second World War Britain had t he largest empire, which spanned the whole of the globe. But in the next thirty years this was dramatically reduced in size. The beginning(a) country to seek independence from Britain at the end of the Second World War was India. India was seen as the Jewel in the crown of the British Empire and was of key significance to Britain. Even before WWI it was evident that the Indian desire for freedom would prove increasingly difficult for Britain to deal and control.Although British officials dominated the key posts in the civil service, barely one per-cent of the civil population was British. There were many disturbances and large unrest throughout India, the British political science do some concession to the demand for a greater share by Indians in the local affairs. It was too late by instanter and this offer was no longer sufficient the total withdrawal of British convening was now the aim of Nationalists.The Indian society was made up of vary and often conflicting races, cast es and religions India had no single nationalist voice. Until some sort of unity could be achieved Indian aspirations would be frustrated, this frustration found outlet in increasing violence. This came to an end and then it was non-violence that now became the chief factor in the advance of Indian Nationalism. The move was called Civil Disobedience and was thought up by an Indian man named Gandhi. Gandhi was the single most important influence in the growth of Indian Nationalism. Gandhi was a devout Hindu although he sought joint respect and tolerance between all religions and races.Gandhi became a type of figurehead and identified with all castes. For a time he was even able to gain Muslim support. Although fearing that independence gained on Gandhis terms would lead to the subjection of interests in favour of the Hindu majority, the Muslim Nationalists preferred separate to collective action. It became a disbelief of not whether Britain should withdraw but when they would with draw. The Japanese War effort by Britain interrupted the Indian problem. Many Indians, during the war effort, tried to overthrow British rule but the police and the army remained loyal and British control was unbroken. At the end of the Japanese War it was obvious to see that to keep control of India against the call of her throngs would stretch Britains resources too far, Britain could no longer afford to do so and the will to do so had largely gone.The Muslim League, led by Jinnah, was increasingly suspicious of the Hindus, represented by the Congress Party and its leader Nehru, an upper class Anglophile. A sizeable Sikh minority was equally apprehensive of beingness swamped in an independent India. To such groups, federation deep down a single sovereign state was not acceptable. Partition seemed to be the only solution that would unclutter the dominant religious groups happy. After much haggling and arguing the Hindu Congress and Muslim League agreed to the partition proposa ls India, the sub continent, was to be change integrity into two distinct states India, overwhelmingly Hindu Pakistan and East Pakistan predominatly Muslim. The British method of partition was to set a date for British withdrawal 1947, and then rub down up until this date to achieve a peaceful partition. When the partition was created making India a Hindu state and Pakistan a Muslim state many people found themselves in the wrong area and there was a lot of mass movement of people between the two areas.To Britain the most valuable habituation of all was Malaya, which is an example of what the British were willing to do where the Empire remained worth while. In the latter half of the 19th century Malayas economy assumed many of the major aspects of its present character. The output of tin, which had been mined for centuries, increased greatly with the utilisation of modern methods. Rubber trees were introduced (Indian labourers were imported to work the coat plantations), and Mal aya became a leading rubber producer. In 1948 its net dollar earnings amounted to 170 million and it provided over half the USAs imports of rubber and nearly all imports of tin.In the difficult days after WWII Malayas exports were vitally important in keeping the Sterling Area solvent. The Sterling Area was formed in 1939 to maintain the pound sterling as an supranational currency. It included the whole of the British Empire and Commonwealth, with few exceptions. This meant that Malaya had to buy goods from within the Sterling Area, meaning their money was tied up in the Empire. Malayas economic character, as well as its geographic position, gave it great strategic importance. The British built their fortifications accordingly at Singapore.The Malayans, anxious to regain their independence, had first to face an unexpected dispute from Communist Guerrillas, mainly Chinese, who were anxious to acquire control of the many raw materials in Malaya. The Chinese were a minority in Malaya and not popular. The Malayans didnt want to give ear under the control of their great neighbour, Communist China. They were willing to accept the assistance of British forces and the Guerrillas, after about five years were expelled.After the defeat of the communists Malaya travel quietly to independence. The Malayans united behind Rahman. Rahman was the kind of courteous conservative with whom the British had always felt able to do business. The federation of Malaya became an independent state within the Commonwealth on 31st August 1957.Britain controlled many countries in Africa including the following Ghana, Nigeria, Zambia, Uganda and Kenya. Kenya was one of the most important of the African countries. Strategically the Naval Base at Mombasa Port near to the Suez Canal was priceless. If the port fell into the hands of the Communists it would prove devastating. Climatically it was suitable for European settlement and the British saw it as a New Australia. British settlers went o ut in small numbers before and after WWI and in rather large numbers after WWII.Those that moved out there successfully introduced plantation farming of crops such as coffee and tea, the land was very rich. The British settlers believed that the country belonged to them and expected to evolve a government like that of Canada or Australia. Due to the large European population Britain didnt want to upset them, it was said that there would be an all white Kenyan Government. disrespect this, the settlers received a major set back when they were told Primarily Kenya is an African territorythe interests of the African natives must be paramount by the Duke of Devonshire, Colonial Secretary.Other than the European community there was another outside community within Kenya, an Asian community. The Asians were prosperous and sometimes became money lenders. They were hated by the Africans. Britain saw themselves and America as being superior to the Asian world and then again that the Asian wo rld was superior to the Africans. The British did not think that the Africans were intelligent enough to be able to run their own country, this was seen as being a very racist and prejudiced viewpoint and there was a loss of confidence.The Kikuyu were farmers in the role where the capital of Nairobi had been established. They were more disturbed in the possession of their land than other tribes and they also came into contact with European ideas and European education. Jomo Kenyatta, later the leader of the Kikuyu, was first educated at a Presbyterian mission school.The first African organisation, the Kikuyu Association was formed in 1920 but was a very moderate body made up of the elders and the chiefs. In 1921 the Young Kikuyu Association was founded by the younger men, educated like Kenyatta himself in the mission schools, and was much more radical in temper. Kenyatta was oversea from 1929 to 1946. When he returned he found that the Kikuyu Central Association had been condemned as trying to undermine the Government during the war and that very little constitutional progress had been made. solitary(prenominal) in 1952 were Africans elected to the Council and then by a complicated indirect system.The early 1950s saw the terrorist outbreaks known as the Mau Mau. With their fearsome oaths and occasional atrocities, they spread terror among the European community, although in fact most of the atrocities were against other Africans. It was unknown whether Kenyatta had any connection with the Mau Mau, he was arrested and banished to a northern part of the colony. The white colonists could not conquer the Mau Mau on their own and had to ask for troop reinforcements from Britain. This need for outside assistance ended any remaining thoughts that settlers might have had that they would be loose of running an independent state.During the Mau Mau troubles a new constitution was introduced into Kenya called the Lyttleton constitution. This was an extremely complicat ed system designed to allow the Africans to gain some ministerial experience. Many of the more die hard Europeans didnt like this at all. A new European Party was set up, the United Country Party, to work for a society which would be multi-racial yet would safeguard both the political and land rights of the Europeans.This was doomed, the tide was now firmly in favour of making Kenya an independent African country, although there were seat reserved in the Legislative Council for minority groups, including Europeans. There were now two main African parties, the K.A.N.U which drew its strength from the Kikuyu and Luo tribes and favoured a centralised system of government, and the K.A.D.U, support by the Masai and a number of smaller tribes who wanted a more federal system of government. K.A.N.U, led by Kenyatta, won the 1963 election, the last before Kenya got independence on the 12th of December 1963.Economically Britain could not possibly to afford to maintain an Empire. It could n ot afford to defend its countries from outside attacking forces, let completely from enemies within. The threats of civil war, in terms of India, was a very dangerous one, it would have been im manageable for Britain to control the entire population of India with its army. Britain without a doubt relied heavily on the trade links within its Empire, it couldnt afford to lose these links but it could not afford to keep them at the way things were going. By creating the Common-Wealth it made it possible for Britain to hand over Independence to countries, making them happy, as well as keeping them within a trading circle. Most of the countries in the Empire wanted Independence, Britain wanted the trade to remain, it was the best solution.

Approaches to Psychology Essay Example for Free

Approaches to Psychology EssayThe psychoanalytic approach was started and developed mainly in Europe between 1900 and 1939 by Sigmund Freud, a Viennese doctor who specialized in neurology. As a doctor, he became interested in the firmament of hysteria the manifestation of physical symptoms without physical causes and became convinced that unconscious mental causes were responsible, and could be responsible for all mental disorders and even our personality.He created the theory of personality, and found his ideas upon intensive mooring studies of a considerable range of patients, especially his infamous study on Little Hans, a young boy who Freud carried out depth psychology upon. Bowlby (1946) applied Freuds theories when he used psychoanalysis on a large group of children with various ages on a study of habitual delinquency. The central accent is on dynamic, biological processes especially those taking place in the unconscious mind, and involves the idea of psychic deter minism, i.e. Freudian slips. Freud said that we all redeem instinctual drives wishes, desires, needs, or demands, which be hidden and suppressed from the consciousness because society disapproves of their open expression. Freud proposes three main components of the mind the id, the ego and the superego. The id operates on the pleasure principle and its goal is immediate pleasure and reduction of tension caused by irrational impulses. The ego operates on the reality principle, and controls the id in its reaction with the world.The superego operates on the idealisation principle, with norms and values of society being internalised. gibe to this approach, we all undergo psychosexual stages oral, anal, phallic, latency and genital which gradually motivate the individual to focus on the libido, and can be linked with the Oedipus complex. The libido is described as psychic energy behind primary drives of hunger, aggression, sex and irrational impulses. Fixation at any of these stag es can lead to behaviour in our adulthood reflecting in front stages of our childhood, which be caused by unresolved conflicts.For example, fixation at the oral stage can cause adult behaviour that is centred on the mouth (eating, smoking, etc. ) The declare oneself of psychoanalysis was as a therapy to treat mental disorder by means of treating the unconscious mind. The methods that Freud used for investigating the unconsciousness were by means of case studies, and deep analysis and interpretation. Free association involves the uninhibited expression of thought association, no matter how bizarre or embarrassing, from the client to the psychoanalyst.Dream analysis involves the analyst attempting to decode the symbols and unravel the hidden meaning (the latent content) of a dream from the dreamers report (the manifest content). Freud used his theory to explain a number of topics. He explained that the development of personality came from fixations or defence mechanisms, and that a ggression was caused by hydraulic drives and displacement. Abnormality was seen as the consequence of early traumas and repression, which subsequently could impair our moral and sexual practice development, the latter being the result of the Oedipus complex.The psychoanalytic approach has been greatly influential within psychology, in areas much(prenominal) as psychotherapy and developmental theories, and also beyond in art, literature and other sciences, some 100 years since Freud first developed his ideas. His theory has had some experimental support in certain areas, such as repression and fixation. Freud introduced the world to the concept of the unconscious, and regarded his case studies like Little Hans and Anna O as firm empirical support for his theory.He thought his belief in determinism and detailed collection of data were scientific, yet many psychologists today argue that his theories and ideas are too biological, that is that they rely too much on the influence of fu ndamental instincts and physical drives. Most of Freuds ideas and concepts came from only a handful of results on the study of children. Freud could have allowed his own prejudices to shape his analysis, leading to no objective measures. His close interventions and feedback to the childs family could have changed the childs behaviour and that of its family.Psychoanalysis lacks rigorous empirical support, especially regarding normal development, and leads to reductionism, i. e. it reduces human activity to a basic set of structures, which cant account for behaviour. Freuds ideas have been charge of being irrefutable, and are therefore theoretically unscientific. Another approach to psychology is the behaviourist approach, which concentrates on the theory of learning and behavioural therapy, and tries to explain behaviour in terms of its relation to environmental events (stimuli), rather than any innate factors.The view that behaviour should be the sole subject matter of psychology w as first locomote by the American psychologist John B. Watson in the early 1900s. His position came to be called behaviourism. He believed that psychologists could not afford to speculate upon the unobservable inner workings of the mind, since they are too private to be studied scientifically. For the behaviourist, much of their research focuses on objectively observable behaviour, rather than any internal process. The approach proposes that behaviour is radical, and that it is caused and keep in this way.

Computational Chemistry for Drug Discovery

computational Chemistry for Drug DiscoveryComputer ChemistryComputational chemistry is a branch of chemistry that uses computers to assist in solution chemical problems. It uses the results of theoretical chemistry, incorporated into efficient programs, to calculate the structures of molecules and solids.In theoritcal chemistry, chemists, physicist and mathematics develop algorithms and computer programs to scream atomic and molecular properties and reaction paths for chemical reactions. Computational chemists, in contrast, may simply apply existing computer programs and methodologies to specify chemical question. There ar two different aspects to computational chemistry.Computational studies tail end be carried out in rove to find a starting point for a laboratory synthesis, or to assist in understanding experimental data, such as the position and source of spectroscopic peaks.Computational studies provide be use to predict the possibility of so far entirely noncitizen mol ecules or to explore reaction mechanisms that are not readily studied by experimental means.Computer- serviceed medicate husking/ designing methods collapse played a major role in the development of therapeutic in ally important small molecules for over 2-3 decades 133. Over the past couple of decades, many powerful standalone tools for computer-aided drug discovery have been essential 134.In silico metamorphosisAfter adopting combinatorial chemistry and high throughput biological screening in the past couple of decades, the pharmaceutical manufacture generated a large collection of potent and selective compounds for numerous targets. However, to become an optimal drug, in addition to potency and selectivity, a compound must have appropriate ADME (absorption, distribution, transfiguration and ex founding), safety and develop cogency characteristics. Relaying solely on potency in the early stage of drug discovery can result in disproportionate attrition after clinical candidat e selection contributing to the exorbitant costs of discovering and developing drugs. Only about one in ten of those diligently chosen, highly potent and selective candidates that enter development reach the market often due to inadequate ADME properties. Therefore, it is extremely important to consider the ADME characteristics of compounds earlier in the discovery make for to wager bets on compounds that have a greater potential to survive the development and clinical trail stage of drug development. change magnitude the odds of success to one in five (instead of ten) would reduce the total cost of bringing a new therapeutic to the market by 33%.Experimental determination of ADME and pharmacokinetic (PK) characteristics is both expensive and time consuming, and is not practical for large numbers of compounds, especially when the pharmaceutical industry is under severe pressure level to cut costs and improve efficiency. The Price tag to support various ongoing discovery projects in pharmaceutical company for synthesis and high throughput measuring of permeability, solubility, metabolic stability and acute toxicity can run into millions of dollars.Therefore, much attention is being focused on the application of in silico screens to reliability predict ADME attributes solely from molecular structure. In silico prognostic of ADME properties will not only reduce cost and development cycle times by wisely enjoin resources to essential experimental testing, but also bring forward their consideration earlier at the lead generation stage when compounds are being synthesized and well-tried almost exclusively to meet pharmacological target potency levels. At the cost of experimental results indicated above, a mere 10-20 % reduction in high throughput experimental measurement of permeability, solubility, metabolic stability, acute toxicity through the use of in silico screens can lead to significant savings. Further, application of in silico screens offers an idea l fail-early-fail-cheaply strategy for drug discovery because their application requires nothing more than inputting the basic structural information of a compound into a validation pretending.Metabolic Stability Measurement in Drug DiscoveryAt most major pharmaceutical companies, metabolic stability assays are conducted at the outset investigation into the metabolism of a compound. These in vitro assays generally utilize liver microsomes and/or hepatocytes to furnish important information about the rate and/or metabolism. In vitro metabolic studies are important in optimizing pharmacokinetic properties such as in vivo half life, maximum concentration and systemic exposure, because rapid metabolism is often a key factor contributing to miserable exposure.The metabolic stability data is helpful for ranking molecules with respect to their ability to resist metabolism. Though high-throughput automated metabolic stability assay systems have been developed by the major pharmaceutical companies, screening a large number of compounds is still intensive.Thus, in silico prediction of metabolic stability can be used to rationalize experimental testing and have significant resources. Further, these models allow for prediction of metabolic stability for virtual libraries, thus bringing forwarded their consideration earlier to hit-to-lead stage.In silico Models for Metabolism StudiesThere are several types of in silico tools available for investigations into metabolism. These include knowledge found systems (metabolism databases) rules based or skilful systems and quantity structure properties relationship (QSPR) and enzyme structure modeling systems. At its simplest, the partition coefficients, Log P (or its computed equivalent), of a drug in the n-octanol-water system has been shown to loosely correlate with the metabolic stability of a compound. As in silico calculations of Log P values have become readily available, they are being implemented in many of the curren t metabolism prediction packages. The earliest in silico metabolism tools were the metabolic reaction databases.In principle, these are databases with the published metabolic reactions and structure of parent compounds and their metabolites. several(prenominal) of these allow creation of corporate metabolic databases as well. In most cases, these databases can be searched for specific biotransformation (by structure and substructure), biotransformation keywords, and by other(a) user-defined fileds. The key advantage of this knowledge based in silico systems is that they include detailed metabolism findings and original references.Prediction of MetabolitesThe above mentioned knowledge based systems provided the groundwork for the development of rules based in silico predictors of metabolites, also called expert systems.Commercial rules based programs such as METEOR, META and MetabolExpert iteratively interrogate the chemical bonds of a molecule and apply programmed biotransformatio n rules in a predetermined hierarchy. As one can imagine, without means of terminating the metabolism tree a very large numbers of metabolites will be generated of predicted. Several of these programs allow the user to specify the number of levels of biotransformation or may use a LogP calculation to terminate the biotransformation process.Prediction of Sites of MetabolismThe mechanism of oxidation by CYPs is though to be constant across all CUPS. One of the most important steps in the oxidation of drugs (by CYPs) is the ability of the perferyl oxy species (FeO+) to carry out a one-electron oxidation through the abstraction of hydrogen atoms. In silico packages such as Admensa, COMPACT and Metasite calculate the likehood of abstracting a hydrogen atom from all sites on a molecule, and then quantify which sites are most seeming to be oxidized. The greatest advantage of these types of predictions is the ability to quantify the most likely major hot spots on the molecule.Prediction of Substrate BindingThe ability of a molecule to properly dock on the active site of enzyme plays a major role in accurately determining the site(s) of metabolism on a molecule. Therefore, modeling of the P450 active sites has long been a goal for metabolism prediction. Some of the first attempts to model the active site of metabolizing enzymes used pharmacophore, site direct mutagenesis, and protein homology. Using homology models built from bacterial and mammalian P450s, in silico studies of docking potential substrates into the active site have been performed with mixed success. Now that the crystal structure for tender-hearted CYP3A4, CYP2C9, CYP2C8 and CYP2A6 are available docking experiment with these models should more reliably predict the sites of metabolism on a molecule that the predictions form the homology models.Prediction of Metabolic banOne of the causes of drug-drug interactions is the inhibition of metabolic pathways. Enzyme inhibition by a drug leads to a decrease in metabolism and intrinsic clearances, and an alteration in pharmacokinetics of a co-administered drug. Any knowledge around the potential of drug-drug interactions is useful for a quantitative assessment of the ability a new molecular entity to inhibit the metabolism of some other drug.In silico methods to predict drug-drug interactions are mostly limited to competitive inhibitors because they rely primarily on the binding models in the used as templates with alignment and preference of core structure in an active site. However, the quality of prediction depends on the structural similarity to the molecules that were used to build the model. Inhibitors of CYP2D6 and CYP2C9 have been predicted using the CoMFA method. For inhibitors of CYP3A4, CYP2C9 and CYP2D6, methods such as CATALYST and GRIND have been used to reduce the bias in the alignment of inhibitors.Prediction of Enzyme InductionThe induction of drug metabolizing enzymes is an additional way in which co-administered dru gs can affect the clearance and pharmacokinetics of a given drug. Induction or augmentd expression of the drug metabolizing enzymes leads to an increase in the rate of metabolism and ultimately, to increase intrinsic clearance. Therefore, enzyme induction leads to decreased drug exposure which may results in therapeutic failure.Most often, the induction of enzymes occurs through the activation of nuclear receptors such as the Arylhydrocarbon receptor (Ahr), the Pregnane X receptor (PXR) and the constitutive Androstane Receptor (ACR). The activation of nuclear receptors PXR and CAR are responsible for the induction of several drug metabolizing enzymes including CYP3A, UGT1A1, SULT1A and CYP2C9. On the other hand, induction of CYP1A, SULT1A1 and UGT1A1 has been associated with activation of AhR.Prediction of Metabolic StabilityAs mentioned above, metabolic stability influences both oral bioavailability and half life of a drug. There is best correlation between in vitro metabolic sta bility and in vivo clearance. Therefore, the assessment of metabolic stability of compounds is being demanded and earlier in discovery projects. To meet these needs, in silico models are commonly employed.As described above, many different in silico tools focused on studying different aspects of metabolism have been developed. In our experience, the excerption of the in silico tool by a user should primarily be guided by the type of information and level of accuracy that is want. It is imperative that the developers of these in silico tools continually refine and validate them to reliably predict and quantify the metabolic fate of drug in humans. On the other hand, the chemists, biologists and ADME scientist on project teams to judge and use the existing in silico tools and to challenge their developers to demand tools that will rationally and efficiently move the discovery projects forward.Metabol ExpertMetabol Expert is an ideal program for a quick prediction of the metabolic f ate of compound in the drug discovery process during the dispositional research phase. Metabol Expert is a unique tool for initial estimation of the structural formula of metabolites. Metabol Expert is a rule based system with open architecture, in other words, the chemists, metabolism researchers, drug disposition experts and environmental managers can understand, expand, modify or optimize the data on which the metabolic structural estimation relies. Commercialized by Compudrug in 1987, Metabol Expert is self-possessed of a database, a knowledge base and several prediction tools. The basic biotransformation database contains 179 biotransformations, 112 of which are derived from Testa and Jenner, the others are based on frequently occurring metabolic pathways.The transformation knowledge-base is composed of if-then type rules. Each is composed of our components, the structure changed during the transformation, the new substructure formed, a list of substructure at least one of whi ch must be exhibit in the molecule for the biotransformation form occurring. These rules have been derived from the literature by experts and are input into the system by means of graphical tools. The system is open so that new rules can be added or existing ones modified or deleted. There are two types of predictions in Metabol Expert. In the first type, the system tries to tally basic transformations automatically. There is a filter so that biotransformation sequences can be arrested after generation of a specified number of metabolites.Basic transformations are categorise as phase I or phase II. In the event of a phase II metabolite being generated, the sequences are arrested and the metabolite is not included in the next level. If a transformation results in the generation of two metabolites, then both are passed into the next level. The second type of analysis is an extended prediction model in which metabolites generated from basic transformations is compared to a list of t ransformations in a learned tree for a given species and the analogues are then listed in order of similarity. The program then attempts to quantify predictions based in the information in the learned tree.MexAlertMexAlert was developed to be an ideal assistant for high-throughput screening. It is advantageous to consider metabolism still before synthesis of the compounds, in order to exclude unwanted metabolic pathways, leading, for example, to first pass effect or to formation of toxic intermediates. MexAlert predicts first pass metabolic pathways by quickly identifying sites on the molecule where Phase II metabolic transformations (in other words, conjugation) may occur. It is rule based system the rules are selected from among the Phase II transformations in the animal knowledge base, and modified according to in vivo experimental example of first-pass effect pathways.In silico toxicity prediction scratch during the drug development process is a serious economic problem for the pharmaceutical industry and it is often due to inappropriate ADME/Tox characteristics. IT has been estimated that 20-40% of the drug failure in investigational drug development phases are due to safety issues, not continuing multiple incidents of adverse effects of existing drugs. The early drug discovery process needs to address in parallel not only potency but also pharmacokinetics and toxicological properties.Van de Waterbeemd and his colleagues at Pfizer have called this approach property-based design, emphasizing the importance of the critical combinations of physical and structural properties that contribute to druglikeness. Ideally this process should begin early in discovery, using computational models to screen both virtual libraries and available compound collections to identify compounds with the desired properties (good potency, ADME and low toxicity). Often molecular size and lipophilicity have an important effect on all one-third properties. High biological activity i s frequently associated with high LogP, but this may also raise the probability of high toxicity.In the 1990s, drug companies invested heavily in combinatorial chemistry and high-throughput screening (HTS) as a source of leads for new targets. Most screen actives turned out to be large and/or hydrophobic, understandably contraindicating to the principles of minimal hydrophobicity. The most visible outcome was not even that they were toxic (because most compounds did not advance that far in development), but that they were either non-water-soluble or non-absorbable. This overshadowed any toxicological consideration in the early stages of drug discovery, bringing forward compounds solubility and permeability as the most urgent problems to address. In the late 1990s the concepts of drug-likeness and lead likeness emerged and simple rules were formulated e.g. rule of 5 to warn chemists when compounds were well outside the property space normal for viva voce active drugs.These rules ar e now widely used in Virtual Screening to remove undesirable compounds from consideration prior to their synthesis or acquisition. In addition to simple property filters toxicological issues should also be considered because otherwise any specific hazardous sub structural effects are ignored. Some of the harshest reactivity effects are identified and removed using predefined alert substructures (e.g., acid halides) (sometimes called dribble filters). The problem is the most of such alert substructures are chameleonic in nature, i.e., they may not necessarily cause toxic effects depending on other functional groups and overall molecular structures (e.g., acid halides). To fix this, all chameleonic substructures (from garbage filters and beyond) must be supplemented with class specific QSARs for different health effects, yielding toxicological expert systems. Such systems can be used in virtual screening along with drug likeness filters to subdivide compounds into safe, hazardous and Questionable. Promising compounds need notwithstanding toxicological evaluation, but this cannot be done by predicative methods alone due to multiple knowledge gaps in their training sets and limited numbers of considered toxicological end points.Sometimes further evaluation is done during lead optimization, when chemical structures are covalently modified and tested. At this stage various toxicological predictions are used to prioritize both compounds that are to be tested and in vitro methods can reliably predict drugs effect on a whole animal system, yet animal(prenominal) Tests are not usually done until drug development candidates are identified. By this time drug development cost can reach lusty levels, economic risks become considerable.Thus any predictive tools that help to identify adverse effects in animals prior to conducting such testes are highly desirable. If a known toxic pharmacophore is identified and closely related to the pharmacophore required for activity at the therapeutic target then series specific SAR is needed to aid design of molecules with an adequate separation between the therapeutic dose and the dose threshold for the toxic effect. Since it is essential to have an in vitro surrogate that can model the desired in vivo effect on a significant number of compounds. Some of the more important end points for which in vitro surrogates that can model the desired in vivo effect on a significant numbers of compounds. Some of the more important end points for which in vitro surrogates have been used are QT prolongation in heart due to blockade of the hERG potassium channel, hepatotoxicity due to compounds that produce phospholipidosis and hepatotoxicity due to induction of CYP450 enzymes.To summarize, in drug design toxicity predictions can be useful for three purpose virtual screeing, prioritization of compounds and in vitro tests, and prediction of health effects in whole animal systems. Although many toxicologists are understandabl y farewell us with no choice but to make the attempt using available animal toxicity database.