00000nam 2200000za 4500 9.841511 CaOODSP 20221107152115 cr ||||||||||| 170811s1971 oncad ob f000 0 eng d CaOODSP eng eng fre n-cn--- M34-20/140E-PDF M34-20/140 Ahmed, S. M. (Syed M.), 1943- The use of a 'cytopherometer' in electrophoretic studies of minerals and mineral-leaching bacteria [electronic resource] / Syed M. Ahmed, Mineral Sciences Division. Ottawa : Information Canada, 1971. iv, 18 p. : charts, ill. Technical bulletin ; TB 140 Cover title. "August 1971." Digitized edition from print [produced by Natural Resources Canada]. Includes bibliographical references. “The application of a 'Cytopherometer' (Carl Zeiss Inc.) to electrokinetic studies of mineral suspensions in aqueous electrolyte solutions has been investigated. The Cytopherometer was modified by incorporating palladium electrodes with electrochemically occluded hydrogen. Thus modified, the Cytopherometer enables fast and accurate electrokinetic measurements to be made on mineral suspensions in liquids. Precautions to be taken in the use of palladium electrodes are given. It was found from electrokinetic studies that the mineral-leaching bacteria, thiobacillus-ferrooxidans did not acquire any surface charge in acidic solutions of KNO3, KCl, Fe2+, Fe3+, NH4+, Mg2+, and Ca2+. This electrical neutrality of the bacterial surface is probably due to the protective action of the bacterial membrane. However, the bacteria developed a strong negative charge in alkaline solutions of KNO3 and KCl which is attributed to the rupture of protective membrane and the formation of R< NH2/COO- groups on the cellular surface. Any ionic surfactant that may be used to enhance the bacterial leaching of minerals (in acid solutions) should have a charge that is opposite to the charge on the mineral surface. The amount of surfactant to be used may also be critical"--Abstract, p. i. Includes abstract in French. gccst Minerals gccst Bacteria Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 140 (CaOODSP)9.834857 PDF 3.24 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-140-eng.pdf 300025