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What is the virus that causes flu? Why doesn't the body create permanent immunity against that virus? How does the vaccine against flu work?
Flu is a disease caused by the influenza virus, a highly mutant DNA virus. Because of the high mutation rate of the virus, that forms many dissimilar strains, flu always presents epidemic features in affected populations and people may have some flu episodes during life (the immune response made from previous infections is not efficient in future infections).
The vaccine against flu is a vaccine made of attenuated virus of three dissimilar strains. Each year the WHO (World Health Organization) researches and determines which are the strains that should compose the vaccine. This is a method to face the high mutation rate of the virus.
Gibberellins in plant growth Gibberellins were first isolated from the culture of a fungus Gibberella fujikuori. Gibberellins has a significant effect on stem elongation
What are typical structures of the seed? What is the endosperm? A typical seed is the composed of the embryo, endosperm and shell. Inside seeds of angiosperms there are one or
Community Gradients and Boundaries It is often difficult or impossible to determine where one community ends and the next begins. Many communities, in fact, grade continuousl
GREGOR JOHANN MENDEL 1. Mendel was born on 22 July 1822 at Heizendorf in Austria at Selesia village. 2. Mendel was worked in Augustion Monastry as monk at Br
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Describe in detail about Retina The retina is a highly complex layer of nervous tissue. The photoreceptors are rods and cones for scotopic and photopic vision respectively. Th
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The human blood group, related to the MN system is controlled by two alleles, S and s. Three distinct phenotypes can be identified by mean of biochemical tests. Among 1000 Britishe
Viruses Viruses are sub cellular, ultramicroscopic infectious agents of 20 nm-300 nm size range Many of them cause diseases like polio, dengue, small pox, measles, rabies, com
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