Response of Aquatic Organisms Communities to Global Climate Changes and Anthropogenic Impact: Evidence from Listvennichny Bay of Lake Baikal.

Recent studies have revealed how the freshwater biota of Lake Baikal responds to climate change and anthropogenic impacts. We studied phyto- and zooplankton, as well as phyto- and zoobenthos, in the open coastal waters of the southern basin of the lake and of Listvennichny Bay. A total of 180 aquatic organism taxa were recorded.

[Seasonal dynamics of chrysophyte stomatocyst formation in the plankton of Southern Baikal].

The results of studies on the phytoplankton of Southern Baikal in 2004 show that siliceous stomatocysts (cysts) of chrysophyte algae make a significant contribution to this community. Their abundance reaches a peak of 46 800 cysts/l between August and October, when the concentration of biogenic elements is minimum. The D/C coefficient (the ratio of diatom cells to cysts) varies during the year, reflecting the seasonal succession of phytoplankton and changes in the concentration of biogenic elements in the photic layer.

Estimation of the prevalence and causes of infertility in western Siberia.

The study examined the epidemiology and causes of infertility in Tomsk, Western Siberia, using methodological approaches recommended by WHO and was based on the findings for a randomly selected sample of 2000 married women aged 18-45 years. Among the respondents, 333 couples were considered infertile since they had not conceived after 12 months or more of unprotected intercourse. This group of infertile couples was offered comprehensive clinical investigations but only 186 couples completed them.

[Disorders of neurohumoral regulation in rats exposed to the poison of the scorpion Buthus eupeus].

The intraperitoneal injection of Buthus eupeus to rats (2,5 mg/kg) results in increasing of catecholamines and cyclic nucleotides content in blood. The hyperinsulinemia is observed simultaneously with the development of hyperglycaemia. It is believed that the activation of the cyclic system is a key mechanism of the neuro-humoral disturbances of homeostasis in case of scorpion venom influence.