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Microbila Degradation of a Montmorillonite-Dextran Complex¹

ABSTRACT

Microorganisms capable of metabolizing the detran B-512F were isolated from a Webster clay loam soil. Suspension of cells were added to polysaccharide solutions or suspensions of clay-polysaccharide complexes in Warburg respirometers. Oxygen uptake curves, divided into three stages, indicated that the dextran was partially protected in the presence of clay. Rates of oxygen uptake in stage I (1 to 3 hours) were much higher for the systems with dextran alone than for those containing clay-dextran complexes. Rates for stages II (4 to 6 hours) and III (7 to 48 hours) were about equal for systems containing the same amount of dextran. The uptake rate in the first stage indicated a linear relationship to the amount of clay present, while the second stage was related to the amount of dextran initially present.

¹ Contribution from the Corn Belt Branch, Soil and Water Conserv. Res. Div., Agr. Res. Ser., USDA, in cooperation with the Dept. of Soil Science, Univ. of Minn. Paper no. 7247, Scientific Journal Series, Minnesota Agr. Exp. Sta. Presented before Div. S-3, Soil Science Society of America, Nov. 12, 1968, at New Orelans, La.

² Soil Scientist, ARS, USDA, Durant, Okla.; and Research Chemist, ARS, USDA, and Associate Professor, Univ. of Minn., St. Paul 55101.

Received for publication December 16, 1970. Accepted for publication September 17, 1971.