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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.)
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Class angiospermae (Flowering plants) Flowers are the reproductive structures. Ovules are protected within ovary, xylem vessels are present. After fertilisation the ovary develop
Which law of thermodynamics explains the fact that we must eat to gain the energy to perform the functions of life, such as breathing? a. fourth law b. first law c. second law d
Weiss's Theory of Fibroosseous Fixation Weiss' theory stated that there is a fibro-osseous ligament formed between the implant and the bone and this ligament can be considered
E mb ryonic stem cells (ES): These are pleuripotent cells of early embryo (blastocyst) capable of giving rise to all differentiated cells, including germ line cells. Em
Q. Use of Chemicals to Control and Destruct Microorganisms? Ans. The use of chemicals, as a process of food preservation, has been used since long, ever since man found
Neurosecretory Cells and Neurosecretion We have before said that the neurosecretory cells are an important component of the non- chordate endocrine system. Of course, they are
Q. What are the Common congenital heart disease? Fossa Ovalis ASD Commonest defect is fossa ovalis ASD. It can be closed by devices. ASD should be sized in various views
How old is the earth? It is believed that the earth is about 4.5 billion years old.
Q. What are the Physical Signs of aortic stenosis? Typically the carotid pulse in severe aortic stenosis is delayed (pulsus tardus). It is also decreased in amplitude (pulses p
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