title: Bone demineralization mechanisms at level of free radicals and nanoscale subsystems of bone tissue.
abstract: Influence of simulated microgravity on characteristics of rat bones was investigated by electron paramagnetic resonance (EPR). For simulation of microgravity condition the hanging of animal by tail was used. The main measurements were performed for diaphysis of femoral bones. The quantity of native radicals Rn, localized in an organic matrix, and carbonate radicals CO2-, localized on a surface of bioapatite nanocrystals, were determined. The decrease of CO2- radical quantity in bones of experimental animals have shown, that due to simulation of microgravity the decrease of "collagen-nanocrystals" interaction takes place. It is shown that the EPR method open possibilities to receive the unique information about bone demineralization processes at level of free radicals and nanoscale subsystems of bone tissue.
authors.affiliation: Institute of Geochemistry, Mineralogy and Ore Formation, Kiev, Ukraine. ab@brik.relc.com
authors.forename: A
authors.initials: A
authors.lastname: Brik
authors.forename: V
authors.initials: V
authors.lastname: Oganov
authors.forename: L
authors.initials: L
authors.lastname: Rozenfeld
authors.forename: O
authors.initials: O
authors.lastname: Atamanenko
authors.forename: A
authors.initials: A
authors.lastname: Kalinichenko
authors.forename: L
authors.initials: L
authors.lastname: Ovsyannikova
authors.forename: N
authors.initials: N
authors.lastname: Bagmut
mesh_terms: D000818:Animals; D016880:Anisotropy; D018488:Bone Demineralization, Pathologic / Q000503:physiopathology*; D001842:Bone and Bones / Q000503:physiopathology*; D002245:Carbon Dioxide / Q000032:analysis / Q000737:chemistry; D003094:Collagen / Q000737:chemistry; D018483:Diaphyses; D004578:Electron Spin Resonance Spectroscopy; D005269:Femur; D005609:Free Radicals / Q000032:analysis*; D019417:Hindlimb Suspension; D049329:Nanostructures / Q000737:chemistry*; D051381:Rats; D018474:Weightlessness Simulation
chemical_list: D005609:Free Radicals; D002245:Carbon Dioxide; D003094:Collagen