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Explain about Bioactive materials
Bioactive materials: Certain glasses, ceramics, and glass-ceramics that contain oxides of silicon, sodium, calcium and phosphorus (SiO2 , Na2O, CaO, and P2O5 ) form a chemical bond with bone, resulting in a strong mechanical implant bone bond. These materials do bond to bone through a time-dependent, kinetic modification of the surface triggered by their implantation within living bone. An ion-exchange reaction between the bioactive implant and surrounding body fluids results in the formation of a biologically active calcium phosphate layer on the implant. This layer is chemically and crystallographically equivalent to the mineral phase in bone which is responsible for the strong interfacial bonding.
Heparinisation : The patient should be fully heparinised before the start of cardio pulmonary bypass. Baseline activated clotting time is measured (ACT). 3 mg (300 units) per k
Thickness and toughness of plant walls are increased by deposition within original cellulose wall, of a substance called as lignin. Process of deposition is called: a) Lignific
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Fresh Water Water, a universal solvent, invariably contains many soluble salts. In fresh water the total salt content remains under 15 percent. Different types of soluble salts
Explain Fontan Operation ? The original Fontan operation was done in a case where classical Glenn operation had been done (end-Lo-end anastomosis of superior vena cava and lig
Does every amino acid have a central carbon? To which organic group is that central carbon bound? A carboxyl group -COOH, an amine group - NH 2 , an atom of hydrogen -H and a v
Mechanisms of different species of animal In an animal when the need to change the focal power of the eye arises, different mechanisms are there in different species of animal
Cell Determination Cell determination is a process through which portions of embryonic genome are selected for expression in particular embryonic cells. Determination to follo
Lipids Lipids are oily or greasy organic compound forming about 3% of protoplasm. These are also compound of carbon hydrogen and oxygen but unlike carbohydrates. The hydrogen a
Q. Are protozoans presenting pulsatile or contractile vacuoles easily found in fresh or in salt water? Fresh water is the less concentrated of solutes than sea water and it fre
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