Question

In: Biology

describe why Filarial parasites undergo nocturnal periodicity and what accounts for this phenomenon.

describe why Filarial parasites undergo nocturnal periodicity and what accounts for this phenomenon.

Solutions

Expert Solution

Answer: Filariasis is a parasitic infection caused by Wuchereria bancrofti (helminthiasis). The infection is spread by blood-feeding insects (black flies, mosquitoes etc.). In host peripheral blood circulation the peak of parasite in night when the mosquito vectors are seeking a blood meal. Numerous auto fluorescence granules are present in nocturnal species of W. Bancrofti. The present granules act as photoreceptors responsible for negative phototoxic of microfilariae. So in day time these negative photoreceptor gives the negative signal for their movement. However, when the host (infected individuals) keep for long time in dark (in day time) or the individual working in coal mining these photoreceptors are not active even in day time due to lack of exposed sunlight then the microfilariae move in peripheral circulation. So the presence of autofulorescence photoreceptor is responsible for the nocturnal activity of parasite W. Bancrofti.Normally for diagnosis the blood samples can be collected in night (when the parasite concentration is high in blood circulation) or by the use of Diethylcarbamazine (DEC) even in day time. DEC induce the circulation of microfilariae in peripheral blood circulation.


Related Solutions

describe why filarial parasites undergo nocturnal periodicity. What account for this phenomenon and it relevance to...
describe why filarial parasites undergo nocturnal periodicity. What account for this phenomenon and it relevance to the parasite? Please this question is worth 30 marks. I don't want to fail. Help me
describe the different changes in the orbit of the Earth around the sun including their periodicity?
describe the different changes in the orbit of the Earth around the sun including their periodicity?
1. Describe the process of closing the accounts and why we close the accounts at the...
1. Describe the process of closing the accounts and why we close the accounts at the end of the year. 2. If management gets a bonus based on the Profit of the company, describe in your own words how management could change the net income using an estimate. Give a clear example. 3. If you were starting a restaurant, would you choose to start as a proprietorship, partnership, or corporation. Give a full analysis of your reasons.
Describe the photo electric event experimentally. Why can't the photoelectric phenomenon be explained by classical physics?
Describe the photo electric event experimentally. Why can't the photoelectric phenomenon be explained by classical physics?
Describe, briefly, the frost-heave phenomenon. How could you reduce the negative impacts of this phenomenon
Describe, briefly, the frost-heave phenomenon. How could you reduce the negative impacts of this phenomenon
why does himan skin color vary? What biological phenomenon is this a good example of? What...
why does himan skin color vary? What biological phenomenon is this a good example of? What is race? Does biological evidence support classic ideas of race? Why or why not?
10. What environmental factor contributes most to endangering animals in marine environments? Why do gut parasites...
10. What environmental factor contributes most to endangering animals in marine environments? Why do gut parasites increase in human populations in Africa when lion populations dwindle? How many General Shermans would it take to offset one day’s worth of gasoline usage in the US? Why will the lack of carbon output not last after quarantine ends? What are the most realistically effective means of conservation?
Biology Ecology Unit 1. A.) Describe how the phenomenon of bioaccumulation occurs in an ecosystem. What...
Biology Ecology Unit 1. A.) Describe how the phenomenon of bioaccumulation occurs in an ecosystem. What chemical/physical properties make a compound bioaccumulate? Which organisms are affected the most and why? B.) Which scientist is first credited for bringing this phenomenon to light, what book did she write? Briefly explain the reaction and ultimate outcomes that resulted. 2. Explain how the wildlife values of different seral (successional) stages change during the process of succession in the lowland forests of Western Washington...
What is a chart of accounts? Why is it important to develop a chart of accounts?...
What is a chart of accounts? Why is it important to develop a chart of accounts? What impact on a company would there be if a company's chart of accounts has errors or one was not developed? Provide 3 specific examples.
Compare and contrast alpha and beta decay. What type of decay should 32Si undergo, and why?
Compare and contrast alpha and beta decay. What type of decay should 32Si undergo, and why?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT