Abundance and Taxonomic Composition of Bacterioplankton in Freshwater Lake Gusinoye (Buryatia) in the Warm Water Zone of the Gusinoozerskaya Thermal Power Plant

The abundance and taxonomic composition of bacterioplankton was determined in different parts of Lake Gusinoyе, which is the largest freshwater lake in Buryatia (Russia) and is used as a cooling reservoir for the Gusinoozerskaya thermal power plant (TPP). The lake is also used as a public water supply and for commercial fishing. The chemical composition of water in the warm water discharge channel did not differ from that in the lake. The total number of bacteria in the water ranged from 0.1 to 2.5 million cells/ml; the maximum counts of bacterial cells were obtained close to the mouth of the Zagustai River, where household effluents are discharged. Seasonal dynamics showed an increase in bacterial numbers that corresponded with the spring peak of phytoplankton development in May. The maximum numbers of organotrophic bacteria were observed in the warm water discharge channel, the point of its influx into the lake and near the inflowing rivers’ mouths. There were no significant differences between the number of bacteria in the zones subjected to and those not subjected to the thermal impact of the power plant. However, total abundance and numbers of organotrophic bacteria were higher in the warm water discharge channel and in the mouth areas of the rivers. This observation suggests that a “barrier zone” with increased number and activity of microorganisms, typical of river mouths, may also be formed in the discharge channel. The patterns of bacterioplankton diversity in the parts of the lake exposed to the thermal pressure were similar. The phyla Cyanobacteria (average 28%), Actinobacteria (average 28%) and Proteobacteria (average 22%), Firmicutes (average 9%) and Bacteroidetes (average 7%) dominated. The peculiarity of the taxonomic composition of this community was the dominance of the phyla Cyanobacteria and Actinobacteria, which indicates that production and destruction processes can be intensifie

Single spin asymmetry measurements for π0\pi^0 inclusive productions in p+p↑→π0+Xp+p_{\uparrow} \to \pi^0 + X and \pi^-+\p_{\uparrow}\to \pi^0+X reactions at 70 and 40 GeV respectively

The inclusive $\pi^0$ asymmetries were measured in reactions $p+p\uparrow \to \pi^0+X$ and $\pi^-+p\uparrow \to \pi^0+X$ at 70 and 40 GeV/c respectively. The measurements were made at the central region (for the first reaction) and asymmetry is compatible with zero in the entire measured $p_T$ region. For the second reaction the asymmetry is zero for small $x_F$ region ($-0.4<x_F<-0.1, 0.5<p_T(GeV/c) <1.5$) and increases with growth of $\mid x_F\mid$. Averaged over the interval $-0.8<x_F<-0.4, 1<p_T(GeV/c)<2$ the asymmetry was $-(13.8\pm 3.8)$.Comment: 4 pages, 2 figures; Presented at SPIN-2004 at Trieste, October 10-16,200

Численность и таксономический состав бактериопланктона в пресном озере Гусиное (Бурятия) в зоне влияния теплых вод Гусиноозерской ГРЭС

The abundance and taxonomic composition of bacterioplankton was determined in different parts of Lake Gusinoyе, which is the largest freshwater lake in Buryatia (Russia) and is used as a cooling reservoir for the Gusinoozerskaya thermal power plant (TPP). The lake is also used as a public water supply and for commercial fishing. The chemical composition of water in the warm water discharge channel did not differ from that in the lake. The total number of bacteria in the water ranged from 0.1 to 2.5 million cells/ml; the maximum counts of bacterial cells were obtained close to the mouth of the Zagustai River, where household effluents are discharged. Seasonal dynamics showed an increase in bacterial numbers that corresponded with the spring peak of phytoplankton development in May. The maximum numbers of organotrophic bacteria were observed in the warm water discharge channel, the point of its influx into the lake and near the inflowing rivers’ mouths. There were no significant differences between the number of bacteria in the zones subjected to and those not subjected to the thermal impact of the power plant. However, total abundance and numbers of organotrophic bacteria were higher in the warm water discharge channel and in the mouth areas of the rivers. This observation suggests that a “barrier zone” with increased number and activity of microorganisms, typical of river mouths, may also be formed in the discharge channel. The patterns of bacterioplankton diversity in the parts of the lake exposed to the thermal pressure were similar. The phyla Cyanobacteria (average 28%), Actinobacteria (average 28%) and Proteobacteria (average 22%), Firmicutes (average 9%) and Bacteroidetes (average 7%) dominated. The peculiarity of the taxonomic composition of this community was the dominance of the phyla Cyanobacteria and Actinobacteria, which indicates that production and destruction processes can be intensifiedОпределены численность и таксономический состав бактериопланктона в различных участках крупнейшего в Республике Бурятия пресного озера Гусиное, которое является водоемом-охладителем Гусиноозерской ГРЭС, также используется для хозяйственно-питьевого водоснабжения и в рыбохозяйственных целях. По химическому составу вод не выявлено отличий между сбросным каналом теплых вод и акваторией озера. Общая численность бактерий в воде озера колебалась от 0.1 до 2.5 млн. кл/мл, максимальные значения выявлены около устья реки Загустай, где происходит сброс очищенных сточных бытовых вод. В сезонной динамике наблюдалось увеличение численности почти на всех станциях в мае, в весенний пик развития фитопланктона. Максимальная численность органотрофных бактерий обнаружена в сбросном канале теплых вод и месте впадения сбросного канала в озеро, а также в местах вблизи впадения в озеро рек. Явных различий по показателям численности бактерий между зоной теплового влияния ГРЭС и зоной, не подверженной тепловому влиянию, не наблюдалось. Можно отметить увеличение численности микроорганизмов в термальном сбросном канале и в участках около устьев рек. Возможно, в сбросном канале образуется «барьерная зона», характерная для устьев рек и характеризующаяся увеличением численности и активности микроорганизмов. Разнообразие бактериопланктона в участках озера, подвергающихся тепловому прессу, было схожим. В составе сообщества доминировали представители филумов Cyanobacteria (в среднем 28%), Actinobacteria (в среднем 28%) и Proteobacteria (в среднем 22%), Firmicutes (в среднем 9%) и Bacteroidetes (7%). Особенностью таксономического состава сообщества было доминирование филумов Cyanobacteria и Actinobacteria, что указывает на возможную интенсификацию процессов продукции и деструкци