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A. I. Kopylov Ya. V. Stroinov E. A. Zabotkina A. V. Romanenko T. S. Maslennikova 《Biology Bulletin》2013,40(3):337-341
In July 2010, abnormally high water temperature (25–29°C), as well as increased biomass and phytoplankton production caused intensive development of heterotrophic bacteria and heterotrophic nanoflagellates. It was found that the abundance, biomass, and production of heterotrophic bacterioplankton, as well as the abundance and biomass of heterotrophic nanoflagellates, and the number of planktonic viruses, which were calculated on average for the reservoir under study, turned out to be higher in the years with lower water temperature (20–23°C). The virus-induced mortality of bacterioplankton in the Oka River and the Cheboksary Reservoir averaged 25.4 ± 3.4 and 22.4 ± 2.7% of the daily bacterioplankton production. 相似文献
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Bacterial bioluminescence was applied to detection of general toxicity (MIT test) and genotoxicity (SOS-lux test) of some chemicals, seawater, and fresh water. The SOS-induced luminescence of E. coli WP2s (cda::luxCDABE) cells was higher than in E. coli C 600 (cda::luxCDABE) at 37 degrees C and pH 6.5. The mutagenic effect of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), mitomycin C, and hydrogen peroxide determined from the induction of E. coli WP2s cell luminescence was detected at lower concentrations than in the assessment of reversion frequencies. General toxicity was demonstrated by using luminescence inhibition for hydrogen peroxide, Zn2+, and Cd2+ at low concentrations. Regions of the Krasnodar Krai where sea and fresh waters exerted toxic action on luminescence were determined by the microbioluminescent method. 相似文献
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Maslennikova AV Varlamov AA Strelets VB 《Zhurnal vysshe? nervno? deiatelnosti imeni I P Pavlova》2012,62(3):286-291
Human perception of dissonant and consonant chords was studied by analyzing brain evoked activity. It was found that the perception of dissonant chords was accompanied by activation of the right frontal lobe, which controls negative emotions. Consonant chords activated the left frontal region, which controls positive emotions. 相似文献
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D. R. Maslennikova Ch. R. Allagulova K. A. Fedorova A. A. Plotnikov A. M. Avalbaev F. M. Shakirova 《Russian Journal of Plant Physiology》2017,64(5):665-671
We investigated effects of sodium nitroprusside (SNP), the donor of nitric oxide (NO), on the growth and hormonal system of wheat plants (Triticum aestivum L.) in normal conditions and after salt stress (2% NaCl). During germination of seeds treated with SNP (50–500 μM), we obtained the SNP concentration (200 μM) optimal for stimulation of seedling growth estimated by increase in seed germination capacity and seedlings' linear sizes and their fresh and dry biomass. A comparative analysis of SNP (200 μM) effects, after seed germination in the medium with SNP or pretreatment of 3-day-old seedlings, showed SNP ability to increase the wheat plant resistance to subsequent effects of sodium chloride salinity at both treatment methods. Protective SNP effects appeared in the reduction of stress inhibitory action on seedling growth rates and significant reduction in the level of lipid peroxidation and exosmosis of electrolytes. An important contribution to realization of the growth-stimulating and protective effects of NO is associated with its ability to influence the state of the hormonal system of wheat plants due to an increase in the concentration of hormones of a cytokinin nature under normal conditions and the prevention of a decrease in their level under stress. 相似文献
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Orlova AG Maslennikova AV Golubiatnikov GIu Kamenskiĭ VA Shakhova NM Babaev AA Snopova LB Ivanova IP Plekhanov VI Prianikova TI Turchin IV 《Biofizika》2011,56(2):349-355
The potentialities of diffuse optical spectroscopy for the noninvasive estimation of the oxygen state of experimental tumors have been demonstrated. The distribution of total, oxygenated and deoxygenated hemoglobin, as well as the level oxygen saturation of blood have been shown using two tumor models differing in the histological structure and functional characteristics. The results obtained by the optical method have been verified by immunohistochemical examination of tissue specimens with the exogenous hypoxia marker pimonidazole. 相似文献
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A. I. Kopylov D. B. Kosolapov E. A. Zabotkina T. S. Maslennikova 《Inland Water Biology》2016,9(4):359-367
Virioplankton and bacterioplankton abundance has been determined in the pelagic and littoral zones of the Rybinsk Reservoir during the ice-covered period. The role of viruses in heterotrophic bacterioplankton infection and mortality is assessed. At water temperatures between 0.3 and 0.9°C, the number of planktonic virus particles and planktonic bacteria varies from 37.1 × 106 to 84.1 × 106 particles/mL, (57.3 ± 2.1) × 106 particles/mL on average and from 2.50 × 106 to 6.11 × 106 cells/mL, (3.66 ± 0.16) × 106 cells/mL on average, respectively. The ratio of the virus number to the bacteria number varies from 8.8 to 27.9, being 16.5 ± 0.7 on average. Visually infected cells comprise 0.3–0.5% (1.5 ± 0.2% on average) of the total number of bacterioplankton. Infected bacterial cells contain from 5 to 107 (17 ± 4 on average) mature virus particles. The average virus-induced mortality of bacteria accounts for 13.0 ± 1.9% (variations range from 2 to 55%) of the daily bacterial production, indicating that viruses play an important role in the regulation of bacterioplankton production and abundance in the Rybinsk Reservoir during the ice-covered period. 相似文献
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The 525 strains of heterotrophic bacteria isolated from natural and cultured populations of the mussel Mytilus trossulus and the surrounding seawater were identified to a genus level on the basis of phenotypic analysis and the fatty acid composition of cell lipids. Gram-negative isolates were dominated by six genera of the family Enterobacteriaceae and by the genera Pseudoalteromonas, Vibrio, Photobacterium, Cytophaga/Flavobacterium/Bacteroides, Pseudomonas, and Moraxella, Gram-positive isolates were mainly represented by the genus Streptomyces. The taxonomic compositions of natural and cultured populations of the mussel M. trossulus in Peter the Great Bay were similar. 相似文献
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