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Carpentier -Edwards Valve (C-E) : This is porcine aortic valve preserved in gluteraldehyde and mounted on flexible stent made of cobalt-chromium-nickel alloy (ELGILOY). Gluteraldehyde, a chemical used for tanning of leather causes stability to valve leaflets due to cross linkage of collagen fibres and it reduces antigenicity. It has sewing ring with polytetra fluoro ethylene (PTFEGoretex), incorporating silicon rubber. Valves are available for aortic and mitral position in various sizes. Biological deterioration will occur after 7- 10 years but mechanical failure is uncommon. The rate of biological deterioration 'is faster in children.
Penicillin, discovered by the Scottish doctor Alexander Fleming, in 1928, is a drug that inhibits enzymes essential for the synthesis of peptidoglycans, a constituent of the bacter
How plants control the opening and the closing of the stomata? The closing and the opening of the stomata depend upon the necessity of the plant to lose water and heat through
Polysaccharide - polymer composed of monosaccharide monomers Starch - Energy storage in plants à straight (amylose) and branched (amylopectin) chains of α-glucose Glycogen
what is respiratory system ?
Define Advantages of Direct Microscopic Count? 1. It is easy, inexpensive and relatively quick method. 2. It gives information regarding size and morphology of microorganism
Write an essay on cytological approach in taxonomy.
explain the mode of nutrition in paramecium, euglena and hydra
EXPERIMENTS OF MENDEL MONOHYBRID CROSSES When only a single pair of contrasting or differentiating traits is considered in a cross (or inheritance of only one pair of cont
Define Fat needs in Nutrient Requirement and Dietary Management? As we have learnt earlier on enteral and parenteral feedings; administration of lipids should be carried out ca
How different is the growth according to the biotic potential of a viral population from the growth according to the biotic potential of a bacterial population? The growth cur
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