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Stentless Devices : A bioprosthesis mounted on a stent reduces the effective orifice area (EOA). The newer version (third generation) stentless gluteraldehyde preserved porcine valves are now available for clinical use. The
commonly used one is Toronto stentless prosthetic valve (SPV) made by St. Jude Medical. The other type is Medtronic free style porcine bioprosthesis. Both are preserved in gluteraldehyde. It can be implanted in the sub-coronary position in the aorta or as a full aortic root replacement with reimplantation of corollary arteries. Usually the cusps remain free of calcium at six years and 85 per cent have freedom from structural deterioration at the end of nine years.
How is plant tissues classified according to their functions? Plant tissues are separated into growth (embryonic) supporting, tissues, filling and photosynthetic tissues (groun
What is vernalisation? How is the process of vernalisation benefits to plants?
Q. How is the light from the sun transformed into chemical energy to be used by the living beings on earth? Light from the sun is converting into chemical energy contained in o
Iron deficiency should be treated with supplemental iron. • Osteoporosis should be treated with calcium and vitamin D supplements. • Depending on individual factors, patien
Define Procedure for Detection of Chalk in Flour Carry out the experiment following the procedure given herewith: 1. Take a teaspoon of flour in a test tube and shake it wit
Types of Development of Animals Different animals have evolved various methods of development. These methods can be broadly categorized into two categories (i) Direct devel
Starch is a large molecule consisting of between 300 to 500 glucose molecules joined together. A glucose molecule is only very small, consisting of 24 atoms. Cellophane is simila
What is the contraceptive mechanism of the IUD? The IUD (intrauterine device) is a piece of plastic coated with copper that is inserted within the uterus by a doctor. Copper is
Which is the vertebrate class that is considered the first entirely terrestrial? The first totally terrrestrial vertebrate class, totally independent from the aquatic habitat,
Tissue culture The ability of a plant cell to give rise to a whole plant is called totipotency. The culture of a cell or a tissue in a suitable medium to produce new plan
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