[Changes in biological activity of turf-podzolic soil of different mechanical composition contaminated with heavy metals].

It has been shown that soil pollution with heavy metals (copper, nickel) lead to negative changes in parameters characterizing potential biological activity of soil (nitrogen-fixation, breath, invertase activity, bacteria and fungi count). More profound changes were observed in sandy soil compared to loamy soil. A direct relationship of these effects with the content of mobile forms of heavy metals in soil has been established.

[Psychrophilic pseudomonas from soil].

A psychrophilic culture of Pseudomonas inhabiting soil was cultivated at a temperature close to the minimum one (0 degrees C) and at a temperature close to a maximum one 28 degrees C) for growth on the original and diluted MPB. No changes were found in the formation of biomass, RNA and DNA. The maximum possible biomass yield was attained sooner at 0 degrees C on a diluted medium than on an original medium.