Accession Number : AD0771446

Title :   Sub-Lethal Effects of Pollutants on Activities of Marine Microorganisms. I. Ecological Implications of Chemotaxis by Marine Bacteria. II. Inhibition of Inter-Microbial Predation by Chlorinated Hydrocarbons.

Descriptive Note : Interim technical rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS

Personal Author(s) : Mitchell,Ralph ; Walsh,F. ; Asketh,P.

Report Date : OCT 1973

Pagination or Media Count : 22

Abstract : Chemotaxis in marine bacteria is shown to be the basis for spatial location in moving aquatic ecosystems. Such response is of importance in the location of prey by bacterial predators. The introduction of a wide variety of compounds results in inhibition or enhancement of the bacterial chemotactic response with specific response dependent upon compound concentration. This observed dependence of level of chemotactic response on concentration suggests that more than one compound can be present in that receptor complex which dictates whether cell motion will be in a linear or a tumbling fashion. Low concentrations of chlorinated hydrocarbons cause a decline in the rate of kill of intestinal bacteria in seawater. This decline is associated with a blockage of chemotactic responses in motile bacteria which prey on Escherichia coli. (Author)

Descriptors :   *Bacteria, *Chemoreceptors, *Hydrocarbons, *Ecology, Sea water, Water pollution

Subject Categories : Microbiology
      Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE