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ADSORPTION OF SODIUM BENTONITE PARTICLES ON BACILLUS SUBTILIS

N. LAHAV
Plant and Soil
Vol. 17, No. 2 (October 1962), pp. 191-208
Published by: Springer
Stable URL: http://www.jstor.org/stable/42931969
Page Count: 18
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ADSORPTION OF SODIUM BENTONITE PARTICLES ON BACILLUS SUBTILIS
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Abstract

A. The influence of sodium bentonite particles smaller than bacterial cells on the electrophoretic mobility of Bacillus subtilis was investigated. Measurements were carried out in sodium chloride and sodium phosphate solutions at various hydrogen ion concentrations and ionic strengths. a. The adsorption of sodium bentonite on the bacteria was found to be a reversible process. b. The bacteria population was observed to be composed of two types of bacteria. The electrophoretic mobility of one type was affected, that of the other type was unaffected by the addition of bentonite to the bacteria suspension, i.e. they represent adsorbing and non-adsorbing groups of bacteria. These two types can be detected only after the addition of bentonite. c. The influence of bentonite on bacteria mobility is dependent on the pH, ion strength, and the electrolyte in solution. The change in mean mobility caused by bentonite is higher the lower the pH and the higher the ionic strength. Also the change is greater in the presence of chloride ion than in the presence of orthophosphate ion. The effect of the hexa-metaphosphate ion was found to be similar to that of the orthophosphate, the effect of the maléate to that of the chloride ion. d. The adsorption of the clay on the bacterial cells was measured quantitatively using a micro-electrophoretic method. B. The mechanisms possible in the adsorption of clay on bacteria were discussed*. Three hypothetical ones were treated: a. Adsorption of the particles by their plane surface ("face-to-face adsorption"). b. Adsorption of the particles at their edges ("edge adsorption"). c. Adsorption combining both face-to-face and edge adsorption ("mixed adsorption")

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