[Bacterial motion in porous media].

The motion of chemotactically different Escherichia coli C600, cheB287, and AW405 cells was studied using a column packed with silica gel. The model chemotaxis of bacteria in porous media seems to be adequate to natural bacterial chemotaxis in soils. The porous structure of silica gel prevents interfering convective flows.

[Bacterial chemotaxis to naphthalene].

The chemotaxis of two pseudomonads, P. putida AZ (Naph+) and P. putida AZ (Naph-), differing in the ability to metabolize naphthalene was studied by the known capillary method of Adler and the densitometric method devised in our laboratory.

[Kinetic analysis of behavior of chemotactic bacterial population at the interface of two media].

The behavior of a population of bacteria at the boundary with a chemotactically active water medium containing the sites of specific binding to cell receptors was analyzed. A kinetic model of chemotaxis was used for the analysis. Differences in the behavior of strains metabolizing and not metabolizing the substrate were revealed.

[Kinetic analysis of the chemotaxis of bacteria].

On the basis of a kinetic model of bacterial chemotactic movement the system of differential equations was reduced to describe the phenomenon of bacterial bonds migration. It follows that Keller-Segel equation is a private case of a more general "diffusion approximation" of the kinetic model. The functional parameters of the reduced equation for E.