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- W2083669128 abstract "1. It had been found previously that after 2 h of shaking with radioisotopelabeled Ca2+ and Zn2+ solutions, the uptake of radioisotope by anorganic bone exceeded uptake by bone powder. In the present work, when the period of shaking was extended to 24 h, results were reversed, the total uptake of radioisotope per mg Ca2+ by bone powder exceeding that by anorganic bone. Possible reasons for this are discussed. 2. Data on 47Ca2+ and 65Zn2+ uptake and on stable Ca2+, P, Zn2+ and Mg2+ in solution and bone indicated that neither bone powder nor anorganic bone showed pure exchange with the solution. Both the Mg2+ and the Ca2+ in bonewere replaced by 47Ca2+ and by 65Zn2+. 3. At pH 6.0 there was considerable reaction with H+, leading to dissolution of the bone mineral. Bone powder dissolved much more readily than anorganic bone and more readily in solutions of Ca2+ than of Zn2+. At pH 7.3, the concentration of H+ was so low that its action could be disregarded. 4. H+ at pH 6.0 was about 1000 times as effective in exchanging with the bone surface as Ca2+. 5. To explain the retardation of Zn2+ uptake by bone powder and anorganic bone following the initial stage of very rapid uptake, it was suggested that Zn2+ that first substituted for Ca2+ in the bone crystal, distorted the surface by attracting negative ions more strongly than Ca2+ did, thus causing expansion of the neighboring crystal surfaces and making them less capable of accepting additional Zn2+ to replace Ca2+." @default.
- W2083669128 created "2016-06-24" @default.
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- W2083669128 date "1969-11-01" @default.
- W2083669128 modified "2023-10-18" @default.
- W2083669128 title "Slow reactions of Ca2+ and Zn2+ with the surfaces of bone powder and anorganic bone" @default.
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- W2083669128 doi "https://doi.org/10.1016/0304-4165(69)90359-6" @default.
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