Foam Separation of Pseudomonas fluorescens and Bacillus subtilis var. niger
AUTOR(ES)
Grieves, R. B.
RESUMO
An experimental investigation established the effect of the presence of inorganic salts on the foam separation of Pseudomonas fluorescens and of Bacillus subtilis var. niger (B. globigii) from aqueous suspension by use of a cationic surfactant. For P. fluorescens, 5.0 μeq/ml of NaCl, KCl, Na2SO4, K2SO4, CaCl2, CaSO4, MgCl2, or MgSO4 produced increases in the cell concentration in the residual suspension (not carried into the foam) from 2.9 × 105 up to 1.6 × 106 to 2.8 × 107 cells per milliliter (initial suspensions contain from 3.3 × 107 to 4.8 × 107 cells per milliliter). The exceptional influence of magnesium was overcome by bringing the cells into contact first with the surfactant and then the salt. For B. subtilis, the presence of 5.0 μeq/ml of any of the eight salts increased the residual cell concentration by one order of magnitude from 1.2 × 104 to about 4.0 × 105 cells per milliliter. This occurred regardless of the sequence of contact as long as the surfactant contact period was sufficient. The presence of salts increased collapsed foam volumes with P. fluorescens and decreased collapsed foam volumes with B. subtilis.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=546846Documentos Relacionados
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