Monday, September 30, 2019

Learning and Determination Essay

What keeps you motivated to go the extra mile even when you want to give up? What helps you get through hard times and accomplish everything you want? Determination is why we get up in the morning. It is what drives us to do what we want to do. Everyone is driven by his or her own determination to be successful in life. The people that are determined to achieve various goals in life are known to succeed in all areas of their life. Determination isn’t a word that you can define with a sentence, it is a word that has plenty different meanings. People will always tell you that you can’t make it, and that you aren’t good enough. They will try to bring you down, so you won’t reach your highest potential. When I was in middle school, one of my teachers told me that I wouldn’t pass eighth grade and that I didn’t have it in me to make it to college. I believed her at the time. Throughout middle school, I was in a program where they helped students with learning disabilities. I was in this program, called Discovery. I always thought that I was unintelligent and couldn’t do anything on my own. Hence, I believed my teacher and had that mindset throughout middle school. As I got older, I learned that people learned differently from other people. It might have taken me longer to learn the subject, but I eventually learned it. Since then, I have been determined to prove that teacher wrong and to prove to myself that I can make it as I long as I put the work in. Determination means to have a strong intention to achieve a certain purpose; to have a strong will power to finish anything you put your mind. Determination is putting everything you have to make yourself better. Determination is putting the extra work in to further yourself. In my family, every person is musically gifted. My parents believe that each kid should know how to play one instrument, if not more. Therefore, when I was in fifth grade, I was obligated to start playing an instrument. I chose to play the clarinet. Learning to play the clarinet was very hard. I was the worst player out of the clarinet section; I sucked. The other students in the band were learning their instrument pretty fast. I started to feel left out because I couldn’t keep up with them. At times I wanted to quit, but I didn’t. I stuck with it. I started to practice every single day. I asked my mother if she could arrange for me to have private lessons. I was determined to get better, so I did everything a fifth grader could. All the extra time I put in, started to pay off. I was working my way to being the first chair in the clarinet section and just becoming a great musician. Determination is one of the greatest assets we can possess. It can bring the best out in us. Determination is the tool we use to defeat discouragement. My teacher told me that I would never be anything. So, I am determined to put everything I have into school and every aspect of my life. Determination is the instrument we use to overcome brief failures to prevent failures from becoming permanent. Determination is what we have to set goals and achieve them. I wanted to be a great clarinet player, so I put the work in and reached my goal. I was determined to be the best, and that’s what I achieved. Determination is the key to be successful. It drives us to be the best person we can possibly be.

Sunday, September 29, 2019

Moral issues in like water for chocolate

Esquivel’s creates loose morals in several ways. First, she begins with the title â€Å"Like water for chocolate.† A locution which translates as â€Å"Water to the boiling point,† and is used as a simile in Mexico to describe any event or relationship that is so intense, hot, and extraordinary that it can only be compared to scalding water on the verge of boiling point. The second is the relationship between Pedro and Josephina, known as Tita. Born the youngest, of the three sisters, she is destined by Mexican culture to take care of her tyrannical righteous mother, Mama Elena, until she dies. The mother-daughter relationship is fraught with difficulty from its inception, when Tita is brought into the world prematurely after her father’s sudden death. Mama Elena is the opposite of a nurturer, never forging any bond with Tita. Tita, as a result develops a relationship with food that gives her power later. Tita’s oldest sister Rosaura marries Pedro after Mama Elena orders her too. Pedro agrees, and a heartbroken, angry Tita, begins to find her strength in her cooking, using it to express her sadness, love, joy, and anger. Her emotions and passions are impetus for expression and action, not through the normal means of communication, however through the food she prepares which begin to affect the people she feeds. It especially affects her sister’s husband’s Pedro, leading them to an affair. Only then she is able to consummate her love with Pedro through the food she serves. This is clearly much more than communication through food or mere aphrodisiac; this is a form of sexual release whereby the rose petal sauce the quail recipe represents Tita’s body. The revelation that Mama Elena had an adulterous affair with an African American, and her second daughter, Gertrudis is the offspring of that relationship is an important thematic compliment to Tita’s deprivation. This transgression of the norms of proper behavior remains hidden from public view, although there is gossip, however it is only when Mama Elena dies when Tita learns Gertrudis, is her half-sister. The life long tyranny of the mother toward Tita is a result of Mama Elena’s shame and lost love. The reaction of these women to Mama Elena’s predicament helps delineate their differing characters. Mama Elena is angry and punishes everybody else for her loss of love turning her into a sinister and domineering mother to her daughters meanwhile Tita, takes her sadness of her lost love, making it work for her through her cooking. The oldest daughter, Rosaura never questions her mother’s authority and tries to follow her dictation submissively. After she is married she becomes a pale comparison of Mama Elena, lacking the strength, skill, and determination of her mother. She therefore tries to live the model, invoking her mother’s authority because she has none of her own. Gertrudis does not challenge her mother but instead responds to her emotions and passions in a direct manner unbecoming a lady. This physical directness leads her to adopt an androgynous life-style and leaves home and her mother’s authority escapes from the brothel and becomes a general of the Revolutionary army, taking a subordinate as a lover. She returns home as a dominant sexual, being dressing like a man, and giving orders like a man. Tita, the youngest of the three sisters, speaks out against her mother’s authority arbitrary rule but cannot escape until she temporarily loses her mind. She induces sadness, and physical discomfort through her cooking by keeping Rosaura, fat, having bad breath, and frequently breaking nauseating wind, therefore keeping Pedro from having sexual  relations with her and becomes pregnant with Pedro’s child. Thus we get to know these woman as persons however, above all, becomes involved with the embodied speaking subject from the past, Tita, represents by her grand-niece (who tells the story) and her cooking. The reader receives verbal food as an imaginative refiguration of one’s woman response to the model that was imposed on her on her by accident of birth. The body of these women is in the place of the living. It is the dwelling place of the human subject. The essential questions of health, illness, pregnancy, childbirth, sexual, and morals are tied together very directly in the novel to the emotional and physical needs of the body. The preparation and eating of food is thus a symbolic representation of living. Mama Elena lingers on in partial madness until long after an attack on the hacienda by outlaws; convinced that Tita is trying to poison her. She cuts her death short to one sudden violent episode and having her visage returns to taunt Tita by cursing the child she is carrying and to renounce her heritage. Tita defeats the ghost by telling her that she knows Gertrudis is illegitimate and hates Mama Elena for everything she never been to her. The rigidity and harshness of Mama Elena is overwhelmingly sociocultural and not peculiar to Tita as a victim. The cook Nacha, who is the only one who gives Tita the love she always wanted from her mother, represents a symbol of integrity. She is the one who teaches Tita how to express her feelings through cooking. Tita herself is a symbol of integrity in the beginning of the book. The writer shows her as a victim of archaic cultural rules keeping her from her one true love. It is only until she realizes her power through her cooking when she loosens her moral integrity to take revenge at the people who have hurt her.   So, this makes Tita a hero fighting against the tyranny of Mama Elena. Tita’s magic are all related to food, with the exception of the kilometer long bedspread she knits during lengthy nights of insomnia. Tita’s cooking controls the pattern of those living in the household because the food she prepares is an extension of her. The vomiting and moroseness at Rosaura’s wedding, is the result of the guests eating the cake of Tita’s tears. Likewise, the sexual frenzy that compels Gertrudis to leave the ranch is occasioned by the transmission of Tita’s passion for Pedro into the dish she prepares for dinner. These incidents suggest a simultaneous and uncontrollability of emotion; food is a potent force in the world of the novel, and lets Tita assert her identity through immorality like her sisters and mother. Esquivel extends the religious–mythical morals of magical realism to the everyday world of the domestic realm of a female-dominated household. This strategy leads the reader to also explore the feminist properties of â€Å"Like water for chocolate†, which are also evident in the depictions of Tita’s struggle for independence and develop her identity through her immorality. In creating this female-centered cast of characters, Esquivel imagines a world in which men are physically present occasionally, though the legacy of sexism and the confinement of woman to freely express their emotions to the domestic sphere persist. Esquivel does not offer readers the vision of a Utopian sisterhood, Esquivel instead brings insight into the way women are restricted by standards of societal propriety perpetuated by other woman. Reference site: Like Water for Chocolate by Laura Esquivel                                                                                                                                                

Saturday, September 28, 2019

Leadership dyad outline Essay Example | Topics and Well Written Essays - 500 words

Leadership dyad outline - Essay Example Bringing changes in the organizations is a basic need to expand the business activities by adopting new ways and strategies. An effective leader is also an innovative leader. Some researchers suggest that the Consideration structure of the leadership styles should be strong by comparing to the initiative structures. The consideration is strongly correlated to the job satisfaction criteria. Walter and Humphrey conducted a research on emotional intelligence and leadership styles to know the effective and performance based leaders’ emergence within the organizations. The result of the research shows that the emergence leadership style 100% effects on the emotional intelligence of the leaders. The effective behavior of the leaders influences 81% on the emotional intelligence. The effectiveness of the leadership influence 87.5% to the emotional intelligence. The research findings present a true picture of the emotional intelligent and its impacts on other variables. It is also included that the role of emotional competencies is important for leadership emergences to perform efficiently through effective strategies implementations. All the leaders are hardworking to perform efficiently. The leaders who have a few skills or not well educated, are called ineffective leaders. The qualities of decision-making choices differentiate the types of ineffective to effective leaders. The effective leaders are sensors, intuitivists, thinkers, feelers, extraverts, introverts, judgers, and the

Friday, September 27, 2019

Climate Change - Maldives Essay Example | Topics and Well Written Essays - 1000 words

Climate Change - Maldives - Essay Example The overall impact of rising of the sea level is flooding or even submergence of low-lying coastal areas. Therefore, low lying islands like the Maldives Islands that lie about 8 feet above the sea level are likely to be submerged. This is due to projections that the sea level is likely to rise for about 8 feet over the next century. Climate change will not only threaten the economy, culture and environment of Maldives, but also the existence of the country (Knox, 2009). Therefore, there is need for the country to revise its foreign policy in order to effectively push for global action on climate change. If the government cannot effectively lobby for global action on climate change then the citizens of Maldives are going to lose their country in the next century. According to the projections released by the Intergovernmental Panel on Climate Change (IPCC), the average global rise in sea level will be between 0.09m and 0.37m in the coming decades (Radic, 2008). This is likely to either submerge the nation’s beaches or increase beach erosion and bring about higher storm surges that threaten the country’s biodiversity (Dunya, 2015). Loss of biodiversity would put the country’s environment at jeopardy as it will result in extinction of various animal and plant species. Increased depths may hinder growth of coral polyps which will in turn affect fish breeding and the country’s fishing grounds. The loss of the coral reef biodiversity will have a devastating impact on human settlement in Maldives Islands. The rise in sea means that salt water will intrude into f resh water sources in the country which will impact negatively on agriculture and terrestrial ecosystems (WorldBank, 2010). Erosion and submergence of beaches in the Maldives Islands means that the country will no longer receive tourists. This will be the worst economic tragedy to the nation since its economy largely depends on foreign exchange earned from the tourism sector. In

Thursday, September 26, 2019

Vision Paper Case Study Example | Topics and Well Written Essays - 750 words

Vision Paper - Case Study Example Finally, the strategy statement establishes precisely how the organization will achieve its vision statement by leveraging its competitive advantage. Ultimately, these perspectives form a cornerstone element of an organization’s strategic plan. Statements a. The specific organization under consideration is L-3 Communications. This organization is a defense contractor. The organization designs products and services for the United States and this country’s allies and strategic partners. Specifically the organization designs Command, Control, Communications, Intelligence, Surveillance, Reconnaissance, as well as aircraft modernization and maintenance (â€Å"L-3 communications,† 2012). The company was founded in 1997 and is named L-3 for Frank Lanza, Robert LaPenta, and Lehman Brothers (â€Å"L-3 communications,† 2012). It was originally a subsidiary of Lockheed Corporation who decided they did not want to own the unit (â€Å"L-3 communications,† 2012). Since the organization’s 1997 beginnings it has progressively expanded through a number of prominent acquisitions (â€Å"L-3 communications,† 2012). b. Vision Statement L-3 Communications seeks to further establish its market position to benefit stakeholders by implementing state of the art research, organizational efficiency, and unparalleled commitment to excellence. Mission Statement Our organization aspires to develop cutting edge of defense innovation and efficient maintenance to effectively contribute to the United States mission at home and abroad. Strategy Statement We seek to gain further market share by building on already business partnerships with the United States government and their allies. This relationships will be advanced and strengthened through ensuring that L-3 Communications maintains an unrivaled commitment to excellence at the forefront of defense innovation. Statement Validation a. The vision, mission, and strategy statements are essential el ements of an organization’s strategic planning. The mission statement as a structural determinant of the organization’s purpose to ensure that its employees, leaders and customers recognize this framework. Still, it’s noted that this statement’s prime purpose is for â€Å"the leadership team and stockholders,† as it gives insight into the firm’s purpose and directs decision making in times of crisis ("Mission statements and," 2011). While the mission statement establishes bottom line measures, the vision statement establishes an approach to organizational planning that is more focused on values and purpose. As such, one recognizes that this statement is more applicable to employees, as it helps guide their conduct and contributes to the effectiveness, or ineffectiveness, of the organizational culture. In addition, the vision statement serves as a degree of advertisement and public relations, as the values and goals established therein work t o inform potential clients of the form of meaning and cultural elements driving the organization in question. Indeed, it has been noted that this statement â€Å"is a stable foundation on which to base planning-both for the long- and short-term† ("Building a team," 2011). Finally, the strategy statement functions to establish the means by which the organization will put into practice the values and intentions articulated in the mission and vision statements. b. The vision, mission, and strategy statements can drive change in the organization through a variety of means. One of the most prominent is that

Wednesday, September 25, 2019

Night of the Living Dead Essay Example | Topics and Well Written Essays - 750 words

Night of the Living Dead - Essay Example So in what way are Vietnam War and Night of the Living Dead connected? First word that comes to mind in an attempt to answer this question is violence. Both this artistic and historical events are based on violence in its pure and essential form. Remembering ‘Nam we surely must say that children were murdered, civilian peaceful villages burned, young girls raped, prisoners of war tortured etc. Elliot Stein of The Village Voice said: "it was not set in Transylvania, but Pennsylvania – this was Middle America at war, and the zombie carnage seemed a grotesque echo of the conflict then raging in Vietnam". The Vietnam War shown in The Night of the Living Dead as a symbol or, better put, the Vietnam War and its perception by people are what moved George Romero towards creating such a movie. They are similar in details (for example search and destroy operations) and make viewer feel and see the impact of the war not in facts but in the whole structure of the film. To prove thei r connection a very popular underground comics Bulletproof Coffin by Shaky Kane and David Hine is inspired by The Night of The Living Dead and in this comics we can actually see war against zombies in Vietnam. So the connection is really there but of course the story and plot can be interesting without them. It is a horror and slasher film which makes action and violent gun shooting seem spectacular. But that is all and in the movie there is nothing else. But if you seek for symbols you should connect the movie with the time it was made and by that you achieve a seeing of a fiction that presents the feelings of those times. But the film which we discuss has a connection not only with Vietnam War. The main hero Ben played by Duane Jones is an Afro-American and up to that time the struggle for racial equality was near its culmination. Martin Luther King jr. was horribly assassinated the same year The Night of The Living Dead was released . It is a very interesting detail that both two main

Tuesday, September 24, 2019

Strategic perpectives - THIS HAS TO BE IN REPORT FORM AND NOT ESSAY

Strategic perpectives - THIS HAS TO BE IN REPORT FORM AND NOT FORM - Essay Example The capabilities of individuals are enhanced through learning which requires assessment of the information gathered (Bolton, 2010). Confucius one of the most renowned Chinese thinker quoted that wisdom can be acquired through three methods. One is by assessment and reflection which is noble, second through imitation which is easy and convenient and lastly by experience which is the most toughest and bitter of them all. I consider that self-assessment and reflection are the most effective ways using which the barriers can be reduced. There are different road blocks which come in light through assessment. Through this, the things are tackled, and appropriate solutions are structured. The seminar in particular and the entire teachings of the Strategic Perspectives have helped me assess the things which are holding me back. The seminar on Mega Learning from October- December 2013 has not only enhanced the learning, but it has also enhanced the experience. Some experiences have been positive, and some have also been negative. However, to conclude both the experiences had some sort of value associated with them. The learning acquired through the seminar will surely benefit me with my career in the future. This will make accomplishing the common goals and encountering the challenges easier. In this assessment, the learning acquired as an individual along with the challenges faced as a group will also be discussed. This will be done by providing three critical incidents which arose during the training and the experience acquired as an individual and by the whole group. The assessment and review will assist in analyzing each of the situations independently. Through this, the actions taken, and their suitability in the particular situation can also be discussed. Discovering the realities and finding the core potential and standings of the individuals in the markets are the true forms through which the assessment can be done. In the self-reflection

Monday, September 23, 2019

HR Strategy Essay Example | Topics and Well Written Essays - 2000 words

HR Strategy - Essay Example The King Faisal Medical City is just one of the elements in the plan of the Saudi government to structure world-class healthcare institutions all through the kingdom. PESTEL Analysis The King Faisal Medical City has hospitals that specialize in neurology, cardiology, rehabilitation, oncology, and ophthalmology. These hospitals have a capacity of more than 1000 beds. The city also has other social institutions like mosques, retail outlets, apartments and a hotel within the King Faisal Medical City. The main aim for concentrating such modern healthcare facilities in one region was to try and facilitate for the de-institutionalization of healthcare by availing family and patient-centred healthcare delivery options to the public. The King Faisal Medical City, which is based in Saudi Arabia’s Southern Province, is a 262,836-square-meter medical city. There are different external factors that affect the manner in which operations within it take place. Political Review Even though it is a recognized fact that the Middle East is an area that tends to be politically unstable, the nation of Saudi Arabia does not usually have many incidents of political instability because of its authoritarian government. The nation also holds approximately 25% of the world’s total supply of oil reserves. This means that not only is the nation well able to structure and plan for modern medical facilities for its population, the existence of its reserves in oil also encourages other nations to push for stability in the nation even when many of its neighbours are embroiled in conflicts. Saudi Arabia’s political stability has encouraged health-related organizations in developed nations to invest in it. Economic Competitive Review Saudi Arabia’s economy, propelled forward by its oil reserves, has been instrumental in the transformation of all of the nation’s different sectors- among which is the healthcare sector. Today, Saudi Arabia’s economy is rank ed as one of the most competitive ones in the international arena (AlFaris, Abdulgader, and Alkhenizan, 431). It pharmaceutical market has been witnessing double digit growth on an annual basis since half a decade ago (Al Juhani and Kishk, 167). This is quite an impressive and attractive platform for foreign health-based corporations which are looking to invest in a vibrant market. According to Almalki, Fitzgerald, and Clark, Saudi Arabia, along with other nations such as Russia, China, Brazil, and India, present the best markets for health based companies (Almalki, Fitzgerald, and Clark, 1481). Socio-Cultural Review The Saudi Arabian healthcare sector is mostly reliant on expatriate medical personnel to fill vacancies for medical practitioners such as nurses, doctors, and pharmacists. Being probably the most conservative culture in the world, Saudi Arabia’s nationals may not be able to take over many of these vacancies because of existing cultural prohibitions that bar them from engaging in some medical practices. The reality of foreign workers taking over the majority of jobs in Saudi Arabia’s medical sector means that the overall culture is constantly being exposed to different changes from foreigners. Technological review The majority of local Saudi firms do not have the technology required to create products such as are required to effect

Sunday, September 22, 2019

The Perfect Pizzeria Essay Example for Free

The Perfect Pizzeria Essay Please answer the following questions applying OB concepts and theories as appropriate. While the case primarily focuses on motivational approaches, you find that other OB concepts that we have covered are applicable. 1. Consider the situation where the manager changed the time period required to receive free food and drink from six to twelve hours of work. Apply the appropriate motivational approaches (theories) to explain what happened. 2. For the situation in which the manager worked beside the employees for a time and then later returned to his ofï ¬ ce, which motivational and/or learning approaches (you may refer to previous chapters) can be applied to explain what happened? 3. Establish and justify a motivational program based on one or a combination of motivation theories to more effectively deal with the situation as it exists at the end of the case.

Saturday, September 21, 2019

Inter-organizational Cooperation Essay Example for Free

Inter-organizational Cooperation Essay The fundamental principle of a resonance inter-organizational cooperation is that an agency must give up something in order to get something else in return. The cooperation of local or international organizational is fostered to ensure that both organization benefit from each other. The inter-organizational attraction brought about by trust plays a big role in helping such collaborations to achieve their goals. Paying much attention on developing leadership styles that will promote effectual and collaborative value chains through building of a closer relationship which comprises of trust, commitment, cooperation, and coordination needed between organization members guarantees success of the alliance. Inter-organizational cooperation has continued focusing on leadership as the key for its success. A clear leadership of a focal organization accounts for a stable alliance by guaranteeing legitimacy and authority within the alliance. Effective leadership helps to deal with social, economic and environmental concerns within the inter-organization (Ebers, 1999). In addition, the inter-organization cooperation are increasingly focusing on leadership so as to ensure coordination by merging resources to achieve new things and address common issues through group decision making. Consequently, the leadership behavior of adapting to the competitive global environment through inter-organizational cooperation rather than competing in an adversarial manner ensures survival of the collaboration. This can be attained through impacting leaders with supply chain management skills so that they may be able to establish and maintain effective inter-organizational networks. Proper investment in leaders will ensure that the desired business results are met given that leaders will facilitate an open exchange of proposals which will foster collaboration. Examples include; Economic and Social Council (ECOSOC), International Labor Organization (ILO) and Consortia and Enduring Construction firms in the U. S.

Friday, September 20, 2019

Virus-host Receptor Interactions in Biology

Virus-host Receptor Interactions in Biology Abstract Viruses are obligate intracellular parasites and, as such, must penetrate a suitable host cell in order to replicate their genomes and disseminate. Most viruses are limited to a specific set of cells or tissues in which they can successfully replicate, and this may be in one or more particular species. When viruses are able to bind a variety of cells, the pathogenesis and overall effect on the organism may differ. The main determinants of viral tropism differ between different virus families, but in order to take the first, and arguably most important step, in the infection of a host cell, the virus must attach via specific interactions between cell surface molecules and viral proteins. Enveloped viruses usually have proteins embedded in their envelope, assembled at the host cell surface prior to budding. In the case of some viruses (such as HIV-1), these may even consist of cellular proteins from the host cell itself. Non- enveloped viruses are usually internalized in some way and uncoated in an endosome in a pH-dependant manner. Many viruses require a number of cell surface receptors for cell entry, and it is this combination, added to other factors such as replication proteins, that determine whether or not a virus can penetrate and replicated within a certain cell. Introduction As obligate intracellular parasites, the life cycle of viruses depends on an intracellular replication phase and they are thus dependant on living cells. The first essential interaction a virus makes with a host cell is with a cell-surface receptor. A viral receptor may be defined as any cell surface component that mediates recognition of a cell and facilitates entry of the virus and subsequent infection. Receptors serve to ensure infection by overcoming repulsion between the virus and cell. (Baranowski, Flint, Jindrak, modern virol) Cellular receptors are generally proteins, although other types of receptor, such as carbohydrates, may be used (see table 1). These molecules are essential components of the cell or extracellular matrix and functions may include cell adhesion, signalling e.g. chemokine and growth factor receptors. (Baranowski 2003) While some viruses require only one receptor, binding to one cellular receptor alone may not be sufficient for initiation of infection for other viruses. Viruses may bind two or more receptors in sequence in order to initiate endocytosis or membrane fusion. For some viruses, the first contact with a cell is through a low-affinity interaction with a ubiquitous molecule, which allows the primary receptor-virus interaction to take place. The primary receptor is generally unique to certain cells and therefore partly defines the tropism of that particular virus, as cells are rendered susceptible to infection by a certain virus if the receptor required for attachment and entry is present. The primary attachment receptor may induce a conformational change in the viral envelope protein bound, to induce further interaction with the cell. (Modern Virology) A further interaction may then be required to initiate infection, performed by a coreceptor.The definition of the term coreceptor may sometimes be ambiguous, but generally, it is taken to be the molecule that induces fusion or penetration of a cell. This may be a further determinant of tropism, for example the interaction of HIV-1 Virus entry into a cell is the first step in the life0cycle of a virus; various mechanisms of viral cell enrty are shown in figure 1. The mechanism of entry varies between viruses, but all begin with the binding of a cellular receptor by a viral protein. Binding of a cellular receptor may induce endocytosis or formation of an endosome, the acidic environment of which induces uncoating; this may be dependent upon cellular proteins clathrin or caveolin. Enveloped viruses may require an acidic environment that will induce conformational changes in envelope proteins required to induce membrane fusion, while others, including the measles and HIV viruses, can fuse directly with the plasma membrane at neutral pH. (Baranowski) Fusion at the plasma membrane releases the nucelocapsid into the cytoplasm, where the virus can make its way to the nucleus or begin replication in the cytoplasm. The differences in these entry pathways are due to the nature of the molecular interactions between the vi ral components and target-cell receptors, for example, viruses that mimic the natural ligand of receptors for signalling molecules interefere with their signalling to promote viral entry into the cell and spread of infection. (Bomsell) Conformational changes resulting from the binding of a primary receptor that allow the binding of a fusion receptor are a common mechanism among various types of virus, including influenza and HIV type 1, examples and brief description. Similar to Influenza . Multiple receptors could be coreceptors and act together either to modulate each other or to contribute complementary functions. Alternatively, the receptors might act sequentially. Binding of the virus to the first receptor could cause changes in the virus or host that are necessary before the second receptor can bind (50). For those viruses in fluids with flow, such as blood or respiratory secretions, the initial binding must be able to effect rapid docking of the virus to its host cell. (Haywood) As previously stated, some viruses recognise more than one cellular receptor. The same receptor may also be used by more than one type of virus. (see table 1) Often, these are highly abundant in many tissues, for example, heparan sulfate can serve as a receptor for many viruses, including Human immunodefiecieny virus, Hepatitis C and Dengue Virus and as a co-receptor for Herpesviruses (excluding EBV). (ODonnel) CAR, acts as a receptor for both coxsackie and adenoviruses. (Schneider) Table 1 illustrates the diversity of cell surface molecules which viruses have adapted to recognise. Some viruses use more than one type of molecule as a primary receptor e.g. reoviruses bind to the beta-adrenergic receptor as well as NAN. (Flint) While the presence of certain receptors on host cells is vital to initiate infection, these interactions are not always sufficient to explain all aspects of cell, tissue and species tropism. (Flint)(Haywood, Schneider) Binding of a viral protein to a cell surface receptor does not necessarily mean a productive infection will follow, since a co-receptor may be absent or functional domains of the receptor may be blocked. (Baranowski) Absence of specific cytoplasmic or nuclear molecules may hinder the replication of some viruses, despite their permissivity. However, even a non-productive infection may induce pathogenic effects, for example, binding to specific receptor may induce the secretion of cytokines. (Schneider) A virus generally cannot infect a cell successfully in the absence of its specific receptor, so the distribution around the body of the receptor will act as a restriction on the range of tissues that can be infected and hence on the number of systems in the body where sig ns and symptoms of infection might be experienced. (Flint) In the true sense of the word, Tropism refers to the specific cells a particular virus is able to replicate in, although the use of receptor by a virus is increasingly a valid definition in the field of virology. Additional factors the cause viral tropism will not be considered in the context of this essay, although they may be mentioned briefly where relevant, since the focus of this review is the link between specific receptor usage and virus tropism and pathogenesis. (Kuhmann) The primary topics explored here are the virus-receptor interactions with cells that allow viruses to enter cells and initiate infection and how this relates to the tropism of the virus at a cellular and organismal level. I am to demonstrate how viral attachment and entry is often a complicated multi-step process, sometimes requiring many different cell and virus molecules. The viruses largely used to illustrate these points, Human Immunodeficiency Virus type 1 (HIV-1), Influenza A and Herpes Simplex Virus type 1 (HSV-1) are human viruses of medical significance, but the tropism of these particular viruses in other animals, along with other viruses specific to other animals will be discussed where relevant. The structure and genomic organisation of these viruses is irrelevant and is only discussed where it relates to the glycoproteins that interact with cellular receptors. Viruses of plants, fungi and bacteria are not discussed The presence on the cell surface of a protein that has been identified as the receptor for a given virus may not be sufficient for a productive viral infection, and there may be multiple mechanisms behind such restrictions: functional domains of the receptor may be blocked in some cellular context, additional proteins (or other cofactors) may be needed, or cells may exhibit impediments for completion of the infection cycle, despite an initial successful interaction with a functional receptor. HSV- Demonstrates how viruses may use a large number of viral proteins and receptors to bind and enter specific cells. (Hayashi and Yoon) and how the interactions are a complex multi-step process. Influenza multiple steps. binds many cell types Tropism is dependent on other receptors and interactions. Of the many examples, the interaction of  the human influenza A virus hemagglutinin  with N-acetylneuraminic acid, and the ensuing  conformational alterations involved  in pH-dependent membrane fusion, are one  of the best characterized at the structural  and functional levels (11) (Baranowski 2001)  example of proteolytic cleavage to aid spread and pathogenesis. Conformational change required for fusion HIV A well-documented case of use of multiple receptos is that of HIV-1 viruses and related viruses. Illustrates how a virus may use multiple coreceptors to mediate entry to different types of cells and thus influence the tropism of this virus. Uses some of the same receptors as other viruses (parallels between HIV, HSV and influenza) Multi-step process The interaction of the virion with the attachment receptor leads to the first conformational changes in the envelope proteins. This step enables the interaction with co-receptors, or entry mediators and further conformational changes at the plasma membrane. In enveloped viruses (top), this may deliver the energy for the direct fusion of the viral envelope and cellular membrane. Some enveloped and non-enveloped viruses require the low pH in acidic endosomes to induce this conformational change. Enveloped viruses may require the low pH to induce membrane fusion (centre). These mechanisms lead to the release and possibly uncoating of the virus genome, and the initiation of the virus replication cycle. Role of Viral Receptor Destruction While non-enveloped viruses typically undergo relase through cytolysis. Influenza and HIV-1 Viruses also demonstrate the importance of receptor-destroying activity on the infectivity of some viruses. This is imperative for the efficient release and cell-cell spread of the virus by preventing the glycoproteins on the newly-emerged virus from binding to the host cell receptors. It is also important for preventing superinfection of cells by the same or different viruses utilising the same receptor, which may result in cell death. The efficient budding and release of Influenza A virus from the host cell relies on the removal of Sialic Acid residues by Neuraminidase. In contract, the HIV-1 virus gp120 envelope glycoprotein downregulates the CD4 receptor after infection of monocytes, by stimulating TNF-ÃŽÂ ± production. Other cellular mechanisms contribute to down-modulation of CD4, including the gene product Nef, which causes CD4 internalisation respectively. The precursor of gp120 and gp41, gp160, has also been found to bind CD4 intracellularly in the presence of viral protein Vpu, resulting in retention of CD4 in the Endoplasmic Rectilium. Enveloped particles leave the infected cell inconspicuously  by budding and secretion. Nonenveloped viruses  are usually thought to undergo release through cell lysis,  but some may escape by secretory mechanisms after  budding into membrane bound compartments and then  losing their membrane (Altenburg et al., 1980). Others  may subvert cellular autophagy pathways to gain access  to exocytic organelles (Jackson et al., 2005).  (Marsh)

Thursday, September 19, 2019

Life :: essays research papers

"Life" In the novel "A Raisin in the Sun" an African American family suffers the loss of one of their family members. He was the oldest person in the family and had always had dreams of his family having a better life. When he died the life insurance company sent the rest of the family a check for ten thousand dollars. The family argues impatiently about how they should spend the money when they finally recieve the money. Walter Lee, the oldest son, wants to invest the money into a liquor store but his younger sister, Beneatha, wants to save most of it to help pay her college tuition. Walters' wife, Ruth, does not know how the money should be spent. The following paragraph will be told in her point of view. My name is Ruth Younger, I am married to Walter Lee and I love him dearly. He is a good husband but he can also cause me much grief. He is always explaining to me his newest dreams about how he is going to make life better for me and the rest of the family. Walters' father just passed away and the life insurance company sent us a hefty check for ten thousand dollars in the mail. No one can decide how to spend the money. I think that Walters' mom should spend the money and go on a trip somewhere far away. Walter keeps telling me about his newest dream of buying a liquor store and how I should try to persuade his mom into letting him spend the money on it. I don't know how we should spend the money so I joined Walters' side and tried to get Mama to let him spend it on his dream. Apparently I joined the wrong side because as soon as Walter gave the money to Willy Harris, one of his buddies who wants to go into business with him, he ran off with the money.

Wednesday, September 18, 2019

Aristotles Nicomachean Ethics: Happiness :: Nicomachean Ethics Essays

From pursuing pleasure to avoiding pain, life seems to ultimately be about achieving happiness. However, how to define and obtain happiness has and continues to be a widely debated issue. In Nicomachean Ethics, Aristotle gives his view on happiness. Aristotle focuses particularly on how reason, our rational capacity, should help us recognize and pursue what will lead to happiness and the good life.';(Cooley and Powell, 459) He refers to the soul as a part of the human body and what its role is in pursuing true happiness and reaching a desirable end. Aristotle defines good'; as that which everything aims.(Aristotle, 459) Humans have an insatiable need to achieve goodness and eventual happiness. Sometimes the end that people aim for is the activity they perform, and other times the end is something we attempt to achieve by means of that activity. Aristotle claims that there must be some end since everything cannot be means to something else.(Aristotle, 460) In this case, there would b e nothing we would try to ultimately achieve and everything would be pointless. An ultimate end exists so that what we aim to achieve is attainable. Some people believe that the highest end is material and obvious (when a person is sick they seek health, and a poor person searches for wealth). Most people think that the highest end is a life of pleasure. Hedonists have defined happiness as " an equivalent to the totality of pleasurable or agreeable feeling.';(Fox, 3) Some pleasures are good and contribute to happiness. Not all ends are ultimate ends but the highest end would have to be something ultimate; the only conceivable ultimate end is happiness. Happiness is perhaps the only clear ultimate end. Happiness is what we strive for by itself and not to get anything else. "So it appears that happiness is the ultimate end and completely sufficient by itself. It is the end we seek in all we do.';(Aristotle, 461) Mans' good is related to his purpose; the purpose of a man involves the actions of his soul (the soul being a part of his reasoning). By carrying out the activities of his soul and doing so with proper excellence and virtue, man is able to reach a desirable end. Virtue, then deals with those feelings and actions in which it is wrong to go too far and wrong to fall too short but in which hitting the mean is praiseworthy and good†¦.