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Appl Environ Microbiol. 1972 May; 23(5): 870-874
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Effect of Several Clay Minerals and Humic Acid on the Survival of Klebsiella aerogenes Exposed to Ultraviolet Irradiation¹

^a Department of Plant Pathology and Microbiology and Department of Soil Science, The Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot, Israel

ABSTRACT

The effect of various clay minerals and humic acid on the survival of Klebsiella aerogenes exposed to ultraviolet (UV) irradiation was investigated. A protective effect was observed and found to depend on the specific light absorption and light scattering properties of the clay minerals and the humic acid used. The higher the specific absorption, the better was the survival of K. aerogenes after UV irradiation. Bacterial survival was lower in clays saturated with divalent cations (Ca, Zn) than in those homoionic to monovalent cations (K).

¹ Part of the Ph.D. dissertation of G. Bitton to be submitted to the Senate of the Hebrew University of Jerusalem, Rehovot, Israel.