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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.
Define the role of Immunoglobin E in Food Allergy? Immunoglobin E (IgE) helps to eliminate parasites (helminthes) and is responsible for classic allergic reactions commonly ref
Write two functions of proteins in biological systems. The important functions of proteins in biological systems are as follows: enzymes membrane carriers anti
What are the basic constituents of the cell membrane? The cell membrane is produced of lipids, proteins and carbohydrates. The membrane lipids are phospholipids, a special t
Evaluation of Specific Radiographs Intra oral peri apical radiographs, cephalograms, panoramic radiographs and Computed tomographies are necessary for complete survey of teeth
What are the synthetic auxins and what are their uses? The Synthetic auxins like naphthalenic acid (NAA) and indolebutyric acid (IBA) are substances similar to IAA (a natural a
Q. Why does the urinary volume increase when alcoholic beverages are ingested? Alcohol inhibits the ADH (antidiuretic hormone) secretion by the hypophysis and Low ADH reduces t
Locomotion,nutrition and reproduction in ptotozoa
What are the advantages of the closed circulatory system over the open circulatory system? The closed circulatory system is more efficient. As blood circulates only inside bloo
What is Portal and Rental Circulation ? The body has other circulation systems that do not return blood directly to the heart. For instance, the blood that drains from the abdo
Sterility in Angiosperms Sterility in angiosperms may arise due to several causes. Either the anther may not be formed, or anthers are formed but meiosis may be abnormal. A
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