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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.)
photosynthesis moderates global warming, briefly explain this statement
Which are the germ layers present in cnidarians? Which tissues of the animal do they originate? These beings there ectoderm and endoderm, two germ layers. Animals with only two
Define Endocrine Systems and Metabolism? As mentioned earlier, the main endocrine gland-pituitary gland secretion decreases. Another important feature in elderly is decline in
Q. Describe Sensory Receptors? Receptor organs can detect external or internal stimuli. They can be classified according to the stimulus to which they respond: • Photorecep
Two major objectives must be achieved to treat IE effectively. The infecting micro-organism in the vegetation must be eradicated. Also, invasive, destructive intracardiac and foca
Predation is a process by which one organism (predator) eats another organism (prey). If the prey population is abundant, the predator population also becomes abundant. If the pred
Nutrition intervention Nutrition intervention, the third step of the nutrition care process, is a specific set of activities and associated materials used to address the prob
what si tubal pregnancy ,
Branemark's Theory of Osseointegration In 1952, Swedish orthopedic surgeon, Branemark, conducted microscopic studies done in situ of the bone marrow in rabbit's fibula with in
Human Impact on Carbon Cycle Human activities have greatly influenced the carbon cycle. The discharge of CO 2 , into the atmosphere is steadily increasing owing to burning of
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