Mechanisms of microbial movement in subsurface materials

摘要: The biological factors important in the penetration of Escherichia coli through anaerobic, nutrient-saturated, Ottawa sand-packed cores were studied under static conditions. In saturated with galactose-peptone medium, motile strains E. penetrated four times faster than mutants defective only flagellar synthesis. Motile, nonchemotactic did chemotactic parental strain. This, plus fact that a galactose mutant peptone medium at same rate or without gradient, indicates chemotaxis may not be required for bacterial unconsolidated porous media. effect gas production on was by using and nonmotile together their respective isogenic non-gas-producing mutants. No differences observed between rates two galactose. However, both detected nonmotile, gas-producing strain five to six mutant, which is an mechanism movement bacteria For strains, decreased increasing concentrations core decreasing inoculum sizes. Also, growth had rates. These results imply that, bacteria, regulated situ rate.(ABSTRACT TRUNCATED AT 250 WORDS)