A Comparative Study of Antioxidant Enzymes Activity to Heat Shock in Amphipods Gmelinoides fasciatus of Littoral Community of Lake Baikal and Thermal Springs

The aim of the current study was to comparative assessment of the antioxidant enzymes activity (peroxidase, catalase, glutathione S-transferase) in endemic species Gmelinoides fasciatus (Stebbing, 1899) inhabitants of the littoral community of the Lake Baikal and the thermal spring under short term thermal stress. It was shown, that the exposure of G. fasciatus from different areas to acute temperature stress didn’t lead to changes in the activities of three key enzymes of the antioxidant system. However, it was found that the activity of glutathione S-transferase in the control animals of thermal springs population is higher than in animals of Lake Baikal. This can be determined by peculiarities of environment of different populations

The Estimation of the Antioxidant Enzymes Activity in Representatives of Different Populations of Lymnaea stagnalis Differ in the Degree of Infestation Under Temperature Stress

The aim of this study was to assess the impact of effects of thermal stress and parasitic infestation on the activity of antioxidant enzymes (peroxidase, catalase and glutathione S-transferase) in different populations of wide-spread species of pulmonate mollusk Lymnaea stagnalis from water bodies with different levels of anthropogenic pollution in Belarus - unpolluted Narach Lake and polluted Chizhovsky reservoir. There are several differences were found under thermal stress exposition (35 °С). In non infected mollusсs of both populations the peroxidase activity decreased and activity of catalase increased. An activity of glutathione S-transferase increased in non infested mollusks that inhabit polluted Chizhovsky reservoir

Estimation of experimental cohabitation between Holarctic and Baikal Endemic Amphipods Species: G. lacustris against G. fasciatus

The aim of the present study was to estimate the cohabitation effect of two invasive amphipods species (Gammarus lacustris and Gmelinoides fasciatus) by the cellular stress markers such as activity of antioxidant enzymes (peroxidase, catalase, glutathione S-transferase) and content of heat shock protein 70 (HSP70). Changes of antioxidant enzymes activity were shown in both amphipods species. It was observed that in G. lacustris cohabitation with other species led to the activation of all studied enzymes, whereas in G. fasciatus only peroxidase activity alteration was recorded. Notably, the activation of all studied enzymes was short-term. There were no changes of HSP70 content for both species. According to obtained data less sensitivity of G. fasciatus stress markers can be one of the key advantages for further successful distribution and adaptation to the new conditions

Culturable Actinobacteria Associated with Baikal Algae: Diversity and Antimicrobial Activity

The aim of the study was to assess the biodiversity of culturable strains of actinobacteria isolated from freshwater Baikal algae Draparnaldioides baicalensis and to assess the antimicrobial activity of compounds against Gram-positive bacteria. In the course of this study, we isolated both widespread strains of the genus Streptomyces, and rare representatives of the genus Saccharopolyspora, Nonomuraea, Rhodococcus and Micromonospora. We demonstrated that the strains produce natural products with antimicrobial activity. Considering the large number of rare and active strains associated with the endemic algae D. baicalensis, we shown that these microorganisms have a value for biomedical and biotechnological development and to discovery of new natural compounds, including antibiotics