Cationic Antimicrobial Peptides in Humans

Cationic Antimicrobial Peptides in Humans Antimicrobial peptides Introduction Cationic antimicrobial peptides (AMPs) are gene-encoded peptides of the host defence system made up of 12-50 amino acids, with at least 2 positive charges conferred by lysine and arginine residues and about 50% hydrophobic amino acids (Hancock and Scott 2000). They are produced from gene transcription and ribosomal translation and often, further proteolytically processed (Zhoa 2003). The peptides are folded so that non-polar amino acid side-chains form a hydrophobic face and polar, positively charged residues form a hydrophilic face (Robert and Hancock 1997). Expression of antimicrobial peptides can be constitutive or inducible by infectious or inflammatory stimuli like cytokines, bacteria and lipopolysaccharides (LPS) (Cunliffe and Mahida 2004). They have diverse structures to effectively kill a wide range of microbes at prone sites e. g the skin and lungs, and in secretions such as sweat and saliva (Yeaman and Yount 2004; Santamaria 2005). Many mammalian antimicrobial peptides rouse the host’s innate immune system (Jenssen et al 2006) instead of directly killing the host. Peptides which are found in living organisms from bacteria to plants, insects, fish, amphibians to mammals including humans (Kamysz 2005) are recorded in numerous existing databases e. g. AMSDb (Eukaryotic peptides) (Tossi and Sandri 2002), BAPDb (bacterial peptides), ANTIMIC (natural antimicrobial peptides) (Brahmachary et al 2004) and APPDb. Currently, 1831 peptides are hosted by the Antimicrobial peptide database with 99 antiviral, 453 antifungal, 100 anticancer and 1179 antibacterial peptides (The Antimicrobial Peptide database 2010). In humans, antimicrobial peptides are produced by granulocytes, macrophages and most epithelial and endothelial cells. They boost the immune system, have anti-neoplastic properties and help in regulating cell signalling and multiplication. Amphibian AMPs have been discovered from the skin of frogs from families ra nging from Iomedusa, Pipidae, Hyperoliidae, Ranidae, Hylidae, Discoglossidae, Agalychnis and Litoria. The structure of these peptides as unravelled by CD spectroscopy, NMR spectroscopy and molecular modeling (Suh et al 1996) have been found to be generally 10-46 amino acid residues long (Rollins-Smith et al 2005), mostly linear and simple-structured, (Conlon et al 2004) the majority being hydrophobic, cationic and possessing an amphipathic a-helix in nature. Following production, they are stored in the granular glands (poison glands) of skin dermal layer to be secreted in response to injury (Bovbjerg 1963), or as defence against pathogenic bacteria, fungi, viruses and parasites. Biologically active molecules including antimicrobial peptides are produced as large proteins harbouring a signal and an acidic propiece which get cut off to give an active peptide prior to or at secretion from the poison glands (Amiche et al 1999). Cationic peptides are also expressed in the gastric mucosa cells and in the intestinal tract (Kamysz 2005). The best-known peptides isolated from frogs are caeruleins, tachykinins, bradykinins, thyrotropin- releasing hormone (Barra and Simmaco 1995), brevinins, esculentins, magainins, ranatuerins and temporins (Conlon et al 2004). In the past, peptides were extracted using solvents like methanol or acid from the skins of amphibians after sun-drying but with concomitant dwindling of many frog species, other alternative techniques have emerged, one of which comprises stimulating the frog using mild electricity and collecting the skin secretion; 2-4 weeks after, the secretion can be re-collected after replenishment of the glands (Barra and Simmaco 1995). Large amounts of small peptides and their analogues which are resistant to protease cleavage and contain D-amino acids can be chemically synthesised while larger peptides can be expressed in a prokaryotic host from cloned cDNAs coding for a fusion protein (Piers et al 1993). An efficient means of producing therapeutic peptides in transgenic mice red blood cells has been explained by Sharma et al (1994) whereby the required peptide is collected from proteolytic cleavage from the fusion protein where the peptide is at the C-terminal end of human a-globin.

Low incidence disabilities in education and what medical supports are Assignment

Low incidence disabilities in education and what medical supports are available - Assignment Example There are specialized interventions that cater for students with hearing impairments in the society. This involves cochlear implants that provide a sense of sound to low incidence students that have a problem with hearing. The surgical electronic device is essential for students with partial damages on the sensory hair cells in the cochlea. Its relevance in hearing is evident in different ways. In this case, adults benefit immediately through experiencing improvement in the first three months of implantation. The children may improve at a slower pace since they need a lot of training during implantations process. In general, victims who undergo cochlea implantation perceive loud, medium and soft sounds as they understand speech through lip reading (Niparko, 2009). At the same time, there are autism interventions that involve communication and behavioral strategies. In most cases, this treatment develops treatment protocols that are compatible to the phenotype of each person. Practitioners adopt ABA based interventions, dietary, bio medical, and pharmacological Interventions. In such ways, ABA based interventions are paired with the treatment of children. It reduces disruptive behaviors and is used in teaching complex communication and self-help skills in children. Also, dietary interventions involve the gutten and casein free diet. This composes of an elastic protein in wheat procedure that gives cohesiveness to dough. Many people use this procedure in improving communication and social interaction patterns. Others use the bio medical interventions in chelation and vitamin therapies. In this case, clinical practices are deigned to get rid of the metal toxins that exist in the body. The final pharmacological interventions are used by scientist s in treating symptoms similar to hearing dysfunctions. It is effective in treating symptoms and behavior sin individuals (Trevarthen, 1998). Vision impairment

Palomar Hotel's overall property and operation description Research Paper

Palomar Hotel's overall property and operation description - Research Paper Example The hotel offers free Yoga mats in all the rooms. The organization has onsite fitness centre which remains open 24*7 for the customers of the hotel. In their in-room spa services the hotel offers message treatments, body treatments and facial treatments. It shows the focus of the hotel towards the wellness of the customers. Unique services related with the pets of the customers are also unprecedented that Palomar offers. The hotel takes special care of the pets of the visiting customers (Bing and John 112-117). The hotel provides sophisticated luxury experiences to customers and also provides simple elegant services to them. The business purpose of this hotel is to provide an elegant, sophisticated experience to the customers and to offer unique services to them. With its large scale operation the organization manages large number of employees. The hotel has rich history and it was founded in 1981. State of the art facilities, different modern services and the geographic location of the hotel are the significant competitive advantages of Palomar. ADR of the hotel is $ 4.7 million. All the information given in the above section is significantly important for the customers because all those information will help them to identify the scale of operation of the hotel. It will make them aware about the different services that the hotel offers to its customers. The information related with different signature items of the hotel will inform the guests about the level of special offering to customers. Special offerings showcase the uniqueness of the hotel. The history of the hotel will create a brand image in the minds of the guests. It will create a sense of trust in among of the customers and they will be able to know the rich culture and back ground of the hotel. ADR is a metric which will indicate average realized room rental of the hotel to the customers. The full form of ADR is average daily rate.

HR Management, Training and Development Essay Example | Topics and Well Written Essays - 750 words

HR Management, Training and Development - Essay Example Where Mel tends to believe that the feedback generated daily, by Jennifer, should be enough to enhance the levels of productivity within the subordinate staff members, Jennifer believes that a more formal approach to identifying strengths and weaknesses would create a more positive outcome in terms of overall productivity. Using Abraham Maslows Hierarchy of Needs as an appropriate example to support Jennifers position, under this theory employees cannot reach the apex of their abilities (this being self-actualization) without the receipt of self-esteem (Morris & Maisto, 2005). In the business world, self-esteem has been known as a positive outcome of continuous reinforcement, both positive and critical (Green, 2004). Though the case study suggests that Jennifer is routinely aware of the activities of her subordinate employees and makes attempts to highlight their strengths and weaknesses, it is important to formalize these discussions so as to promise an offer of various rewards for performance. For instance, if the goal of this particular organization is to increase sales, then Jennifer (and Mel) should adopt the formal appraisal process not only to secure a more motivated and productive staff, but to ensure that the employees clearly understand their job-related expectations and receive the necessary self-confidence (esteem) to genuinely enjoy coming to the workplace. This creates a perception of fairness and balance in the management team where the employees can come to rely on truthful reporting of their competency levels and build camaraderie between the management staff and themselves. With this in mind, avoiding the formal appraisal process in exchange for other business-related issues that are considered priority, the organization is denying themselves the opportunity to create a more cohesive staff who works toward strategic objectives in exchange for a fair analysis of their function within the business. Though Mels arguments are somewhat

Cross cultural management Essay Example | Topics and Well Written Essays - 1500 words

Cross cultural management - Essay Example Studies of the ancient china are useful in the understanding of the leadership models in modern china. Research on Chinese leadership is accredited to a scholar known as Misumi, who was Japanese. According to his research, he categorized Chinese leadership into two major classifications notably the model of performance and the maintenance. Maintenance factor is the step taken towards improvement of the human labour force. An interesting close examination of the leadership style adopted in China reveals that leadership characteristics are spread along the organizations with close similarity. For example, according to Mobley, Wang and Li, the survey conducted on state owned enterprises and the private owned enterprises shows that the managers are more sensitive to the environment, are less authoritarian, and encourage a lot of moral behaviors. In particular, the traditional cultural values have more often shaped the styles of leadership and mode of management in china. According to Bod en, leadership in china originates from various qualities as compared to other nations; leaders are created on the basis of knowledge and attitude. The advantage that the ruler has is that the Chinese are very loyal to their leaders and are always ready to take up the responsibility whenever a need arises. The current leaders in china are more linked to the olden traditional rulers because they share certain traditional similarities. According to Boden (2008), these values are Confucian approach, legalistic approach, naturalistic approach, as well as the strategic approach. The Confucian approach, which is also known as the humanistic leadership requires a leader to have moral character and proper conduct. He is also expected to be a lifelong learner. The legalistic approach demands that a leader undergoes punishment whenever he goes wrong; it articulates for stricter codes of conduct. This leader is also expected to have the skills of attracting skilled and knowledgeable followers, rather than them having to display their skills. In this case, the leader is expected to be wise, and at all times, avoid getting into trouble. The delegated duties should be accompanied by rewards if a worker performs well. China is a unique nation with a different cultural setup compared to other nations in the West; this has led to its unique ways of leadership styles that do not conform so much to those of the Western countries. The methods of leadership practiced in other nations have to be greatly modified if they are to fit the nation of China and the vice versa. Gallo points out that â€Å"in fact many of them will never work well here† (2011, p. 5), meaning in China. There are cultural differences that exist between China and the countries from the west. There is also difference in which expectations are laid between the workers and the leaders. Another contributing factor to these differences in leadership styles are the societal values that do vary; some of the values from other nations that may be seen as good can be perceived differently in China. Challenges of leadership are complicated and harder especially when members of an organization come from different cultural setups from that of their leader. The naturalistic appr

Discussion on developmental Democracy Research Paper

Discussion on developmental Democracy - Research Paper Example To better comprehend the strands of republican impression it is crucial to understand its origin in early liberal thought (Held, 2006). The concept of ‘social democratic’ politics has emerged from the beliefs and theories of developmental democracy but it actually fructified in the real politics and policies of the popular Keynesian and interventionist state only after the 2nd World War. The fast economic development after the 2nd World War helped finance a program of make-believe sort of greater welfare but the worldwide economic recession of the 1970s reduced the appeal of the welfare program for not serving the cause of common welfare by both the left and the right. Various stakeholders of the concept of greater social welfare such as politicians, trade unionists and industrialists could not hold the torch together any more but the concept of equality and justice for all cleared the path of a comprehensive program of state intervention in civil society. But no decisiv e limitations were stipulated for the state intervention, thus promoting paternalism, bureaucracy and hierarchy throughout the state politics, which had their own outcomes on the dynamics of democracy (Held, 2006). Developmental democracy is one of the classical models of democracy. It holds that people can bring about change for the better in society through participation in government and community matters for the common welfare of all. Developmental is a part of democracy that states the process used by people to inculcate human prowess to help in creating consciousness of their actions aimed at people themselves to take care of their overall welfare. Citizens play an active role in government and local administrative matters via voting and sharing their opinion with the elected representatives, and also with the government spokespersons. Democracy becomes a medium of educating people and increasing their self-welfare potential. Politics offers a platform to them to use their pow er of taking crucial decisions in other fields. The developmental model employs indirect representation just for the reason that direct involvement is not practically possible like participatory democracy. Developmental democracy offers the possibility of political and social equality. In general, the development model takes it for granted that people can gain civic traits and improve upon their human virtues by actively playing their part in democracy (Library, Think Quest). The purpose of electoral democracy is to promote social and political awareness but this notion inclines to provide greater attention to the ‘professionalization of public policy’ by laying increased focus on political parties and civil society ignoring the fact that democracy is not only of the people and by the people but for the people. Worldwide, a new inclination is being observed towards consumer democracy taking the place of citizen democracy with citizens playing various roles such as consu mers, customers, users, and observing of government offerings as products available in the reach of those only who have the resources to buy (Edigheji, 2005). Thus, negative trends can be observed in the form of sectarian disputes, parties divided on the distribution of private wealth, and disinterest of

Economics Essay Example for Free

Economics Essay 1. What did Keynes think some of the chief benefits and defects of capitalism were? Keynesian theory which was developed by Keynes advocates for a mixed economy where the government and private sector are important. In Keynesian model economy is assumed to be below full employment.   Keynesian argues that the aggregate demand for good which seek to increase employment of resources in the country is the driving force of an economy.   According to Keynes, the government’s role is to reduced unemployment rate and deflation level to enhance increased output in an economy (Baqliano and Bertola, 2003). Capitalism developed by Max argues that the poor in capitalistic society are so because of exploitation by the merchants who own the means of production and distribution.   The merchants are said to exploit the poor through low wages.   Marx argued that the value of any economic good should be determined by the labor used to manufacture.   Any cost that is higher than the cost of labor represents the surplus which is the profits the capitalists realize from exploitation of their laborers.   Marx believes that all means of production should be owned by the government or should control by the government.   Marx advocated for socialist government that owns the means of production or democratic administration that control them. Economists who include Keynes deny the claims of Marx that labor is the only measure for surplus.   According to Keynes who support capitalism, employers and employees are guided by the prevailing market wages hence employers offer employment to willing workers. John Keynes believes in capitalistic economy and called on the government to stimulate it but not eliminate it.   However, Keynes site defect in capitalism where he argues that capitalism does not promote full employment, wealth and incomes which the model seeks to achieve in the long run. Keynesian ideologies have been employed by politician but both abuse of the model, inflation has resulted.   This is evident with government manipulating policies to make economic conditions favorable during election which has led to high inflation in most state.   Action by government leads to reduce real wages and real incomes which do comply with Keynes model.   Capitalism has led to segregation of the society into strata according to income and wealth owned.   Most politician use Keynes ideologies by making promises that will earn them votes.   Implementations of the promises require higher taxation which reduces income of individuals (Baqliano and Bertola, 2003). Keynesian advocate for full employment which should be accompanied buy steady controlled inflation level as an effective means of guiding the economy in he interests of capital.   Keynes argue that real wages can be allowed to fall, government expenditure on schools, hospitals and infrastructure can be reduced as anti-inflationary measures and this inflationary measure should be continued until employment level desired is achieved. According to Keynes denied that unemployment is contributed by capitalism. However Keynes argued that unemployment in capitalism is brought by inadequate demand of personal articles of consumption and productive articles of consumption.   Keynes argue that inadequate demand is as a result of the workers tending to accumulate part of their incomes through savings and the inadequate demand   for productive consumption is brought by failure of people to invest their capital profitability which would lead to increase in output and hence reduced unemployment. Keynes advocates that employment can be increased by lowering real wages through inflation introduction and decreasing rate of interest.   Increased rate of interest will encourage investment of capital which will increase aggregate demand.   The government should then expand its budget to allow mass investment. Consumptive demand can be increased through increased extravagance of the ruling class; investing in war prone areas and increased non-productive expenses by the state.   The increased non-productive expenses to attain full employment of the population will actually lead to diminished living standards of laborers. Keynes in his support for capitalism argued that the workers should not be assisted to rise above the capitalists because capitalists who consist of intellectuals are the quality of life and they carry seed of achievement.   Keynes argued against socialism where the government owns the production. Keynes in support of capitalism advocates the governments to support monopoly.   The wage freezing policy by the federal government in Middle East helped increase the profits of the monopolies while lowering the living standards of the workers. Keynes argue that inflation bring about equilibrium position I n capitalism.   In Capitalism â€Å"Boom lead to increased profits and hence increased prices.   Production expands up to overproduction point where equilibrium is achieved through â€Å"boom bursting. 2. What is the `identification problem` in using econometric analysis? Identification problem in ecometrics involves solving unique values of the parameters of the structural model from the values of the parameters of the reduced form of the model.   Reduced form of a model presents a model where endogenous variables are expressed functions of exogenous variables. For example prices in a marker are determined by supply and demand, hence must establish the demand and supply functions.   However, the equation obtained by regressing quantity on market price cannot be identified specifically as either supply or demand function.   In special cases, we use regression to get demand function.   While holding supply function constant or vice versa, but cannot obtain regression while accommodating fluctuation changes in both (Baqliano and Bertola, 2003).