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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.
DEET DEET is available in the US in many formulations with concentrations of 5%-40% and 100%; higher concentrations present complete protection for a longer period of time, bu
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Arteries - Circulation The arteries deliver blood from the heart. Figure shows the structure of arteries and the different layers of the vessel wall. The thick walls of these
What are the alleles of a gene? The Diploid individuals have paired chromosomes. For instance in humans there are 23 pairs of chromosomes totaling 46 chromosomes. Every pair co
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What is the mode of nutrition in fish,human,amoeba,scorpian & toad ?
Q. Show the important groups of bacteria? The important groups of bacteria are: a) Bacillus: rod-shaped. b) Coccus: spherical. c) Coccobacillus: oval-shaped. d)
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How to Calculate the Requirements for the Calcium in Body? Requirements for calcium depend upon the rate at which calcium is incorporated into bone; they are therefore highest
Q. Show Non-Modifiable Risk Factors for cardiovascular disease? Age: Earlier men less than 55 years were more prone but now heart disease has caught up with a younger age-gro
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