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Why doesn't a long lasting vaccine against common cold exist yet?
Viruses that show a high mutation rate like the virus that causes the common cold escape simply from the action of vaccines against them. After a primary immune response (natural or artificially induced) against the virus in the next season of infection latest mutant resistant strains appear and the protection get with the immune response of the last season is lost. (One could say that the high mutation rate is a produce of "immunization" found by these viruses.)
Contact guidance - Modes of Cell Movement Besides chemical / ionic factors that regulate cell movement in developing embryos, physical factors as well appear to play a role in
Explain Glycerol esters of fatty acids Glycerol esters of fatty acids, which make up to 99% of the lipids of plant and animal origin have been traditionally called fats and oi
Carpentier: Edwards or similar annuloplasty ring is then sutured into place by interrupted sutures to support the repair and reduce the annulus to a measured amount. The ring m
What is the difference between osmosis and diffusion? Osmosis is the occurrence of movement of solvent particles (in general, water) from a region of lower solute concentration
what are the adaptive features of this fish
Explain the Decolourizing Agent - Stain Technique? 95% ethanol is used as a decolourizing agent. It has two functions - (1) It acts as protein - dehydrating agent, and (2
Define Methods of Determination of Proteins and Amino Acid Content in Foods? The methods for protein quality evaluation are grouped under the following headings: I) Analytic
Meaning of Behaviour Change Communication Now day's very common term used for giving health education to people and for giving information to bring change in behaviour is Behav
A genetic trait which is considered to be harmful in the present day might prove to be beneficial in future. For example by removing the trait for sickle cell we may increase the s
what are the principle sources of excessive nitrate and phosphate in rivers and lakes?
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