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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sushchik N.N., Gladyshev M.I., Ivanova E.A., Kravchuk E.S.
Заглавие : Seasonal distribution and fatty acid composition of littoral microalgae in the Yenisei River
Место публикации : Journal of Applied Phycology. - 2010. - Vol. 22, Is. 1. - С. 11-24. - ISSN 09218971 (ISSN) , DOI 10.1007/s10811-009-9418-9
Ключевые слова (''Своб.индексиров.''): fatty acids--riverine microalgae--taxa composition--temperature adaptations--algae--bacillariophyta--chlorophyta--cyanobacteria
Аннотация: We studied fatty acid (FA) composition of littoral microalgae in the fast-flowing oligotrophic river, the Yenisei, Siberia, monthly for 3 years. Seasonal dynamics of species composition had similar patterns in all the studied years. In springs, a pronounced dominance of filamentous green algae occurred, in summer and autumn diatoms were abundant, and in late autumn and winter epilithic biofilms consisted primarily of cyanobacteria and detritus. In general, FA composition of the algal periphytic community was dominated by 16:0, 16:1?7, 20:5?3, 14:0, and 18:3?3 throughout the studied period. Several groups of FAs, which had peculiar seasonal dynamics, were differentiated by statistical analysis based on a method of correlation graphs. The seasonal changes in FA composition could be partly explained by the seasonal succession of species composition of the community. Besides, we found that populations of both diatom and green algae grown in summer at a higher water temperature were lower in polyunsaturated fatty acids than those in spring, at a lower temperature. Hence, we suppose that the regular seasonal dynamics of FA composition of the studied littoral microalgae was driven both by changes in species composition and by temperature adaptations of the algal populations. The highest content of essential polyunsaturated FAs, eicosapentaenoic and docosahexaenoic acids, in the spring "psychrophilic" populations of diatoms could make them of the higher nutritive value for zoobenthic primary consumers. В© Springer Science+Business Media B.V. 2009.
Scopus
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khizhnyak S.V., Tausheva I.V., Berezikova A.A., Nesterenko E.V., Rogozin D.Yu.
Заглавие : Psychrophilic and psychrotolerant heterotrophic microorganisms of Middle Siberian karst cavities
Место публикации : Russian Journal of Ecology. - 2003. - Vol. 34, Is. 4. - С. 231-235. - ISSN 10674136 (ISSN) , DOI 10.1023/A:1024537513439
Ключевые слова (''Своб.индексиров.''): caves--heterotrophic microorganisms--karst cavities--psychorophilic and psychrotolerant microorganisms--bacterium--cavernicolous species--fungus--heterotrophy--karst--low temperature--russian federation--arthrobacter--bacteria (microorganisms)--chrysosporium--corynebacteriaceae--fungi--mucor--penicillium--pseudomonas
Аннотация: The natural microflora of Middle Siberian karst cavities, which comprises psychrotolerant bacteria and fungi capable of growing at 3-15 and 3...+28В°C, respectively, has been studied. Bacteria are ubiquitous in caves, their count varying from 103 to 107 cells/g ground. The bacteria have been identified as Pseudomonas, Arthrobacter, Bacillus, and coryneform bacteria. Fungi have been found in places exposed to increased anthropogenic impact, their count being as large as 106 to 107 cells/g ground. Mucor, Penicillium, and Chrysosporium were dominant fungal genera.
Scopus
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khizhnyak S.V., Tausheva I.V., Berezikova A.A., Nesterenko E.V., Rogozin D.Y.
Заглавие : Psychrophilic and psychrotolerant heterotrophic microorganisms of Middle Siberian karst cavities
Колич.характеристики :5 с
Место публикации : Russ. J. Ecol.: MAIK NAUKA/INTERPERIODICA, 2003. - Vol. 34, Is. 4. - P231-235. - ISSN 1067-4136, DOI 10.1023/A:1024537513439
Примечания : Cited References: 12
Ключевые слова (''Своб.индексиров.''): psychrophilic and psychrotolerant microorganisms--karst cavities--caves--heterotrophic microorganisms
Аннотация: The natural microflora of Middle Siberian karst cavities, which comprises psychrotolerant bacteria and fungi capable of growing at 3-15 and 3...+28degreesC, respectively, has been studied. Bacteria are ubiquitous in caves, their count varying from 10(3) to 10(7) cells/g ground. The bacteria have been identified as Pseudomonas, Arthrobacter, Bacillus, and coryneform bacteria. Fungi have been found in places exposed to increased anthropogenic impact, their count being as large as 10(6) to 10(7) cells/g ground. Mucor Penicillium, and Chrysosporium were dominant fungal genera.
WOS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Larionova, Marina D., Markova, Svetlana V., Vysotski, Eugene S.
Заглавие : The novel extremely psychrophilic luciferase from Metridia longa: Properties of a high-purity protein produced in insect cells
Колич.характеристики :7 с
Коллективы : Bayer AG (Germany); Russian Academy of Sciences [01201351504]; RFBR; Government of Krasnoyarsk Territory [16-44-242099]
Место публикации : Biochem. Biophys. Res. Commun.: ACADEMIC PRESS INC ELSEVIER SCIENCE, 2017. - Vol. 483, Is. 1. - С. 772-778. - ISSN 0006-291X, DOI 10.1016/j.bbrc.2016.12.067. - ISSN 1090-2104(eISSN)
Примечания : Cited References:24. - The cloning of cDNAs encoding MLuc2 isoforms of M. longa was supported by Bayer AG (Germany) and the state budget allocated to the fundamental research at the Russian Academy of Sciences (project No. 01201351504); all other studies were funded by RFBR and Government of Krasnoyarsk Territory according to the research project No. 16-44-242099.
Предметные рубрики: CDNA CLONING
EXPRESSION
ENZYME
Ключевые слова (''Своб.индексиров.''): bioluminescence--coelenterazine--bioluminescent reporter--psychrophilic--enzyme--molecular adaptation
Аннотация: The bright bioluminescence of copepod Metridia longa is conditioned by a small secreted coelenterazinedependent luciferase (MLuc). To date, three isoforms of MLuc differing in length, sequences, and some properties were cloned and successfully applied as high sensitive bioluminescent reporters. In this work, we report cloning of a novel group of genes from M. longa encoding extremely psychrophilic isoforms of MLuc (MLuc2-type). The novel isoforms share only similar to 54-64% of protein sequence identity with the previously cloned isoforms and, consequently, are the product of a separate group of paralogous genes. The MLuc2 isoform with consensus sequence was produced as a natively folded protein using baculovirus/ insect cell expression system, purified, and characterized. The MLuc2 displays a very high bioluminescent activity and high thermostability similar to those of the previously characterized M. longa luciferase isoform MLuc7. However, in contrast to MLuc7 revealing the highest activity at 12-17 degrees C and 0.5 M NaCl, the bioluminescence optima of MLuc2 isoforms are at similar to 5 degrees C and 1 M NaCl. The MLuc(2) adaptation to cold is also accompanied by decrease of melting temperature and affinity to substrate suggesting a more conformational flexibility of a protein structure. The luciferase isoforms with different temperature optima may provide adaptability of the M. longa bioluminescence to the changes of water temperature during diurnal vertical migrations. (C) 2016 Elsevier Inc. All rights reserved.
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