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Q. Why does not a long lasting vaccine against common cold exist yet?
Viruses that present a high mutation rate like the virus that causes the common cold escape easily from the action of vaccines against them. After a primary immune response (artificially or natural induced) against the virus in the next season of infection new mutant resistant strains appear and the protection obtained with the immune response of the last season is lost (One could say that the high mutation rate is a form of "immunization" found by these viruses.)
Define and compare bone modeling and remodeling Bone modeling is a surface-specific activity (apposition or resorption) that produces a net change in the sie and/or shape of a
Osseus defects around implants. They are classified into four main groups. Group I defects: These demonstrate moderate horizontal bone loss with a minimal intrabony component
How do biodiversity, the total number of living beings and the biomass respectively vary during the ecological succession? Biodiversity, the number of living beings and the bio
Name the Primary and secondary minerals found in soils Minerals such as silicate clays and iron oxide, which are formed by breakdown and weathering of less resistant materials,
Q. Can Diseases be etiological factor for diabetes? Diseases: In aging, a very important cause of diabetes could be an underlying disease. Diabetes occurs secondary lo some ot
Double helical structure of dna
Succession - Community Change The factors like fire, floods and human interventions affect an ecosystem considerably. They often lead to the depletion or stripping off of orig
What are the segments that form the body of the tapeworm called? What is their function? The body of the tapeworm is made of segments known as proglottids. The proglottids are
Explain Sodium alginate Sodium alginate helps in aiding cloud retention and inhibits clarification in orange squash and crush. It has been used as the most efficient stabilizer
why obelia is considered to be of special interest in zoology ass an animal showing intermediate grade of organisation
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