Effect of Fe on inorganic polyphosphate level in autotrophic and heterotrophic cells of Rhodospirillum rubrum.

Inorganic polyphosphate is involved in metal homeostasis in microorganisms. The aim of the study was to reveal differences in polyphosphate metabolism of Rhodospirillum rubrum under autotrophic and heterotrophic cultivation in the presence of Fe (2.3 mg Fe L) and without Fe (traces).

Effects of combined magnetic fields on bacteria Rhodospirillum rubrum VKM B-1621.

Bacteria are the simplest model of living organisms and thus are a convenient object for magnetobiological research. This paper describes some effects of combined magnetic fields (CMFs) on the bacterium Rhodospirillum rubrum strain VKM B-1621, which is not a pathogen but was selected due to its wide spectrum of growth abilities. The authors chose magnetic field-resonant phosphorus and iron (Fe ) because P-containing biochemical compounds (standard abbreviations PP , AMP, ADP, ATP) provide energy flows in bacteria while iron could take part in formation of magnetosensitive intracellular inclusions.

The biosorption of cadmium and cobalt and iron ions by yeast Cryptococcus humicola at nitrogen starvation.

Yeasts Cryptococcus humicola accumulated cadmium, cobalt, and iron (~ 50, 17, and 4% of the content in the medium, respectively) from the medium containing glucose, phosphate, and 2 mmol/L of metal salts. The effects of metal absorption on the levels of orthophosphate (Pi) and inorganic polyphosphate (polyP) varied for the metals under study. The levels of Pi and polyP increased in the case of cadmium and cobalt, respectively.

Application of static and impulse magnetic fields to bacteria Rhodospirillum rubrum VKM B-1621.

The paper presents effects of different magnetic fields (MFs) (static-SMF and impulse-IMF) on bacteria Rhodospirillum rubrum VKM B-1621. The MFs had different magnetic strength: SMF-up to 173 mT; IMF-25 mT. The studied object was amylase activity which was measured by decrease in the starch concentration during incubation in the MFs.