Electrical Sensing-Zone Measurement of Particle Size

1966 ◽  
Vol 9 (1) ◽  
pp. 0102-0107 ◽  
Author(s):  
J. R. Cooke and H. D. Bowen
Keyword(s):  
Particle Size ◽  
Electrical Sensing

Sorption between microorganisms and clay minerals as determined by the electrical sensing zone particle analyzer

1968 ◽  
Vol 14 (4) ◽  
pp. 299-307 ◽  
Author(s):  
T. Santoro ◽  
G. Stotzky
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Clay Minerals ◽  
Benzalkonium Chloride ◽  
Yeast Cells ◽  
Monovalent Cations ◽  
Natural Habitats ◽  
Electrical Sensing ◽  
Trivalent Cations ◽  
Electronic Particle Counter

Sorption between microbial cells and clay minerals was determined by measuring changes in particle size distribution with an electronic particle counter. Sorption increased as the valency of the cations present on the clay and in the suspending electrolyte increased. Neither the size, motility, or Gram reaction of bacteria nor the size of the clay appeared to influence sorption. Sorption occurred between bacteria and montmorillonite homoionic to monovalent cations only at pH 2 to 4, but did not occur at any pH with yeast cells, which sorbed only in the presence of trivalent cations. Heat-killed cells of yeast lost their ability to sorb, whereas cells killed with benzalkonium chloride did not. The possible implications of these results in sorption of microorganisms in natural habitats are discussed.

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