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Terrestrial food webs of Antarctica are simple and dominated by microorganisms. Soil bacteria play an important role in nutrient cycling, yet little is known about their capacity to utilize different carbon sources and to participate in site nutrient turnover. Biolog EcoPlate™ was applied to study the catabolic activity and physiological diversity of(More)
Bacterial activity and physiological diversity were characterized in mining and milling impacted soils collected from three abandoned uranium mine sites, Senokos, Buhovo and Sliven, using bacterial dehydrogenase activity and Biolog (EcoPlate) tests. The elemental composition of soils revealed high levels of uranium and heavy metals (sum of technogenic(More)
Uranium mining and milling activities adversely affect the microbial populations of impacted sites. The negative effects of uranium on soil bacteria and fungi are well studied, but little is known about the effects of radionuclides and heavy metals on archaea. The composition and diversity of archaeal communities inhabiting the waste pile of the Sliven(More)
Ore mining and processing have greatly altered ecosystems, often limiting their capacity to provide ecosystem services critical to our survival. The soil environments of two abandoned uranium mines were chosen to analyze the effects of long-term uranium and heavy metal contamination on soil microbial communities using dehydrogenase and phosphatase(More)
Mutagenic and lethal effects of gamma-radiation, N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) and 4-nitroquanidine-1-oxide were investigated on spore suspensions of Streptomyces hygroscopicus SU-A5. It was shown that all the agents induced high percentage of plus mutants. The most stable and active ones were induced by gamma-radiation. The frequency of the(More)
The soil microbiota of a grassy ecosystem in the subalpine belt of the Rila Mountain National Park showed greater amounts of fungal biomass. This remained relatively constant throughout the months of sampling while bacterial biomass was a dynamic value fluctuating within a wide range. The two groups of microorganisms also differed in their in-depth(More)
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