Biology2.1 Essay Example | Topics and Well Written Essays - 500 words

Biology2.1 - Essay Example sion of the virus to humans occurs as a result of human contact with an already infected fowl as well as contaminated surfaces (Centres for Disease Control and Prevention, par. 13). By definition, transmission is the spread or passing of a contagious infection from one person to another or from a contaminated surface or animal to humans. Contamination is very likely to occur in Asia due to poor hygiene amongst Asians contributed by high population. In these areas therefore, a pandemic is most likely to occur when birds are infected. In laymans terms, a pandemic is an outbreak. Centres for Disease Control and Prevention notes that the mortality or death rate as a result of a Bird Flu infection is between 90-100 per cent in most cases in forty eight hours (par. 3). This virus can pose a global threat if it changes to a form that can enhance or enable its transmission from one human being to another (Centres for Disease Control and Prevention, par. 15). Bird Flu replicates through a lytic cycle. Lytic cycle is whereby the virus invades the genetic material of the host animal and subsequently exploit the host cells to reproduce till the cells rupture hence killing them. In comparison, the virus in a lysogenic cycle reproduces without killing the cell (Brooker 379). Once a pathogen, in this case the virus attacks the human, the body reacts through adaptive immunity whereby it is able to identify the virus in case of re-infection and immediately produces antibodies that starts to attack the virus to destroy or kill it. The cells responsible for this process are B-cells and T-cells. T-cells kills the cells infected with the virus and trigger production of cells referred to as interferon that slows down its reproduction (Nathanson 88). To treat viral infections, antiviral drugs to prevent replication of the virus can be administered or drugs to kill the infected cells without killing the host (Nathanson 238). Flu vaccines are made using dead viruses. These dead viruses

Positive Psych Essay Example | Topics and Well Written Essays - 500 words

Positive Psych - Essay Example In any sphere of performance, this would require the leader to assume accountability for his role, provide appropriate guidance and coaching, and immense motivation. Applying situational leadership to Wiegand and Geller’s (2005) predicament on positive reinforcement gives this argument a stronger base. For instance, Wiegand and Geller (2005) emphasize the need for learning-based focus, goal-setting, planning, self-monitoring, and persistence to attain personal mastery, an important indicator for positive reinforcement. By adopting situational leadership, the leader assumes both directive and supportive roles depending upon the situation and the individual. For a starter, the leader is more directive as well as supportive thus providing a direction; guiding the individual through the task, and providing feedback. For an established performer, the leader will have to delegate tasks, monitor and acknowledge his/her performance. In both situations, the leader is being effective in achieving desired outcomes. Secondly, Wiegand and Geller (2005) indicate the need for personal control through tasks, opportunities and involvement in order for individuals to be motivated coupled with consistent feedback (Wiegand and Geller, 2005). Situational leadership explains when and why tasks and opportunities may be given to individuals; these aspects are not explained in both style and contingency approaches. Thirdly, reduction in anxiety and fear of failure is also accomplished by adopting a supportive role by the leader based on situation, which will enhance achievement motivation in individuals. The style approach explains nature and behavior of the leaders, but with little emphasis on situations and also does not consider developmental level of the followers. Northouse (2009) indicates that the style approach is only descriptive of leadership behavior but does not prescribe what