Pleshakova Ekaterina Vladimirovna RussiaSaratovSaratov State University, 83, Astrakhanskaya Str., Saratov, 410012, Russiaprofessor of department of biochemistry and biophysicsDoctor of Biological Sciencesbiofac@sgu.ru Author's articles The Use of Microbial Indicators in Environmental Soil Monitoring of the City Mednogorsk Biogenic Migration of Cd, Pb, Ni, and As in the «Soil– Plant» System and Change in Soil Biological Activity