[Changes in membrane potential and transport of ions through the S. typhimurium LT2 membrane induced by bacteriophages].

Bacteriophages P22 and dp8 cause the membrane potential depolarization for 10-30 mV, reversal rapid H+ influx into bacteria and K+ exit from S. typhimurium LT2, these effects depend on infection plural and are observed only in the presence of Ca+2 in the medium. delta psi depolarization and K+ efflux induced by phage dp8 are increased with the growth of Mg+2 concentration from 0 to 2 mM.

[Characteristics of K+ uptake in S. enteritidis bacteria].

Bacterial Salmonella enteritidis var. Issatchenko in media without exogenic energy source uptakes K+ in one step with Km 2.1 mM and Vmax 0.

[The nature of H+-K+-exchange in anaerobically and aerobically grown S. typhimurium].

H+-K+-exchange via the Trk-like system of K+ accumulation takes place in anaerobically grown S. typhimurium LT-2 with stable ratio of DCC-sensitive ionic fluxes, equal to 2H+ of a cell for one K+ of the medium. This exchange is now observed in the mutant S.

[The character of K+ uptake in anaerobically grown S. typhimurium].

Tre character of K+ uptake in anaerobically grown S. typhimurium LT-2 is studied. In the alkaline media with glucose and moderate K+ activity these bacteria uptake K+ in two steps, the first of which has a high rate of K+ uptake, Km 2.

[The capacity of anaerobically grown bacteria to exchange the 2H+ of the cell for the K+ of the medium and to maintain a high K+ distribution between cell and medium].

The N,N'-dicyclohexylcarbodiimide sensitive exchange of 2H+ of a cell for K+ of medium stable to pH, K+ activity and temperature changes has been discovered in anaerobically grown gram-negative Escherichia coli, Salmonella typhimurium. S. enteritidis, Proteus mirabilis, P.

[Structure of polylysine-DNA complexes].

By the methods of nuclease digestion and electron microscopy the complexes of poly-I-lysine with phage T2 DNA were studied. At micrococcal nuclease digestion of complexes polylysine--phage T2 DNA structures resistant to nuclease and containing fragments of DNA with lengths of about 300, 600, 1200 base pairs were revealed. On the electron micrographs structures superficially resembling nucleosomes were detected.