The elemental composition dynamics of large polyphosphate granules in Acinetobacter strain 210A |
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Authors: | C F C Bonting G J J Kortstee Abraham Boekestein Alexander J B Zehnder |
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Institution: | (1) Department of Microbiology, Agricultural University Wageningen, Hesselink van Suchtelenweg 4, NL-6703 CT Wageningen, The Netherlands;(2) Technical and Physical Engineering Research Service (TFDL-DLO), Mansholtlaan 12, NL-6706 PA Wageningen, The Netherlands;(3) Present address: EAWAG/ETH, CH-8600 Dübendorf, Switzerland |
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Abstract: | Electron microscopy and energy dispersive X-ray micro-analysis were used to examine the elemental composition of large polyphosphate granules in unfixed and unstained intact cells of Acinetobacter strain 210A. When grown in medium with butyrate, Acinetobacter strain 210A possessed 1 or 2 large granules with a diameter of 0.4 m besides a relatively large number of small granules. The large granules were composed of phosphorus, magnesium and potassium. A decrease in the Mg/Ca-ratio of the medium from 5.95 to 0.0073 resulted in a decline in the intracellular Mg/Ca-ratio from 15 to 0.56. At a high intracellular Mg/Ca-ratio, magnesium was the dominant counterion in the polyphosphate granule. Calcium became the major cation in the polyphosphate bodies at a low intracellular Mg/Ca-ratio. Omission of Ca2+ or modification of the K/Mg ratio in the medium did not significantly affect the cation composition of the polyphosphate granules. The dissociation constants for Mg- and Ca-polyphosphate were 9.3×10-2 mol/l and 1.5×10-1 mol/l, respectively. |
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Keywords: | Acinetobacter Polyphosphate granules Energy dispersive analysis of X-rays (EDAX) Polyphosphate solubility |
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