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Haemodynamics : The type of valves chosen should have excellent haemodynamics. In studies at rest and on exercise the valve should produce only acceptable diastolic gradients in the mitral position and systolic gradient in the aortic position. This will depend mainly on the effective orifice area (EOA) of the particular valve.
Prosthetic Valve haemodynamics
A high profile valve like Starr-Edward may cause problems if not properly used. In mitral stenosis with small left ventricle such a valve is better avoided. Similarly when the ascending aorta is narrow it has to be enlarged to accommodate a Stm-Edward valve.
Q. Do the -H groups bound to the central carbons participate in the peptide bond? The central carbons themselves, the -R groups and the hydrogen attached to the central carbons
Draw decanol, plamitic acid (C16:0 fatty acid) and the resulting wax ester generated by a dehydration reaction between both molecules
what is primitive fungi?
What is the main means by which autotrophic beings obtain energy? The major means by which autotrophs obtain energy is photosynthesis (There are also chemosynthetic autotrophs)
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The first ever australopithecine fossil was found in 1924 at Taung, South Africa. It was the skull of a 6 year old child showing a mixture of human and ape like features. This a
Ventilation of Gills Various mechanical devices are used to increase the flow of water over the gill's surface. There can be two means of increasing the flow of water over the
How can the abundance and diversity of living beings in the tropical forests be explained? The biodiversity of these ecosystems can be described by the great availability of th
In what way do chlorofluorocarbons (CFCs) cause global problems? Chlorofluorocarbons react with and deplete the ozone in the ozone layer. This permits more ultra-violet light f
Q. What are the major negative ions found in living beings? The main anions found in living beings are the chlorine anion (Cl - ), the sulphate anion (SO - ), the nitrate ani
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