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Aortic Allograft (Homograft) : In the earlier years fresh antibiotic preserved aortic allografts were tried. As the shelf life is limited, availability of all sizes at all times could not be guaranteed. At present cryopseservation is preferred. The valve is harvested under sterile conditions and is frozen using liquid nitrogen tissue culture medium containing 10 per cent dimethyl sulploxide (DMSO). It is stored a1 -180°C. They are durable and free from structural deterioration in 80 per cent of the patients at 15 years.
Response to Flooding Prolonged flooding or water-logging creates anaerobic conditions for the sub-surface parts of the plant and synthesis of alcohol dehydrogenase (ADH) helps
Why is the proximity between ribosomes and amino acids important for the protein formation? What is the enzyme that catalyzes that reaction? The proximity among ribosomes and a
Define effect of Antioxidants on athletes? Antioxidants like ascorbic acid (vitamin C), tocopherols (vitamin E), selenium, glutathione (GSH) Supplementation (singly or in combi
how respiration takes place in mammls and reptiles
Q. What do you mean by pollen? Pollen grains are the male gametophytes of the phanerogamic (flowering) plants So within the pollen grains the male gametes of these plants are f
Nature defences against viral infections 1. Interferons - In 1957 Issue and Lindenmann discovered that vertebrate cells infected with viruses, produce a diffusible antiv
Chronic Mitral Regurgitation : In chronic mitral regurgitation, the asymptomatic phase is much longer than in mitral stenosis. Onset of symptoms may also mean the onset of l
Gifted Species - Biological Nitrogen-Fixation Biological nitrogen fixation remains mainly confined to a few distinct nutritional types of prokaryotes, some of which are free-l
In what forms are nitrogenous wastes excreted in birds, humans and aquatic turtles respectively ? Why so, describe?
What is the relationship among environmental resistance and the population growth according to the biotic potential curve and the real population growth curve? The difference
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