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Information × Registration Number 0205U002964, 0105U006455 , R & D reports Title The investigation of the effect of weightlessness on the processes of bone demineralization aimed at the training for piloted space flight popup.stage_title Head Brik O.B., Registration Date 19-10-2005 Organization nstitute of Geochemistry, Mineralogy and Ore Formation popup.description2 The investigation of properties of the bone tissue on the atomic-molecular level and the level of nanocrystals of bioapatite by spectroscopic methods was used. The investigation of the formation mechanisms and properties of paramagnetic free radicals in an organic matrix of the bone tissue was used. The properties of the radicals of tooth enamel and of the presenters from which they are formed by irradiation are investigated. Processes of a diffusion and mass-transfer in a mineral component of such biominerals as bones and tooth enamel have been investigated. It is shown that biominerals are special mineral-organic nano-associated systems. Not ions but nanocrystals and water-organic layers charged unlikely are taken as structural units in these systems. A nano-dimensional piezoelectric effect typical of subsystems with a size about nanometers is an important peculiarity of biominerals. Mechanisms of the effect of weightlessness on the processes of bone demineralization at the level of nano-scale subsystems of the bone tissue were investigated. A discussion is given to explain how the above results can be used to increase the reliability of retrospective EPR dosimetry, to determine the mechanisms of bone demineralization during space flight and to study the process by which implant materials (synthetic hydroxylapatite) are assimilated by bone tissue. Product Description popup.authors popup.nrat_date 2020-04-02 Close