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Management and control of microbial populations' development in LSS of missions of different durations / L. A. Somova, N. S. Pechurkin // Advances in Space Research. - 2005. - Vol. 35, Is. 9 SPEC. ISS. - P1621-1625, DOI 10.1016/j.asr.2004.12.046 . - ISSN 0273-1177
Кл.слова (ненормированные):
Long-term missions -- LSS -- Macro- and microorganism -- Microbial populations -- Ecosystems -- Population statistics -- Probability -- Recycling -- Life support systems (LSS) -- Long-term mission -- Macro-and microorganism -- Microbial populations -- Microorganisms -- aerospace medicine -- bioreactor -- bioremediation -- Chlorella -- conference paper -- drug resistance -- human -- hygiene -- immune system -- instrumentation -- methodology -- microbiology -- microclimate -- physiology -- space flight -- waste management -- weightlessness -- Aerospace Medicine -- Biodegradation, Environmental -- Bioreactors -- Chlorella -- Drug Resistance -- Ecological Systems, Closed -- Environmental Microbiology -- Humans -- Hygiene -- Immune System -- Life Support Systems -- Space Flight -- Waste Management -- Weightlessness
Аннотация: The problem of interaction between man and microorganisms in closed habitats is an inextricable part of the whole problem of co-existence between macro- and microorganisms. Concerning the support of human life in closed habitat, we can, conventionally, divide microorganisms, acting in life support system (LSS) into three groups: useful, neutral and harmful. The tasks, for human beings for optimal coexistence with microhabitants seem to be trivial: (1) to increase the activity of useful forms, (2) decrease the activity harmful forms, (3) not allow the neutral forms to become the harmful ones and even to help them to gain useful activity. The task of efficient management and control of microbial population's development in LSS highly depends on mission duration. As for short-term missions without recycling, the proper hygienic procedures are developed. For longer missions, the probability of transformation of the neutral forms into the harmful ones is becoming more dangerous. The LSS for long-term missions are to use cycling-recycling systems, including system with biological recycling. In these systems, microbial populations as regenerative link should be useful and active agents. Some problems of microbial populations control and management are discussed in the paper. В© 2005 COSPAR. Published by Elsevier Ltd. All rights reserved.

Scopus
Держатели документа:
Institute of Biophysics, SB, RAS, Krasnoyarsk, 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Somova, L.A.; Pechurkin, N.S.

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Functional, regulatory and indicator features of microorganisms in man-made ecosystems / L. A. Somova, N. S. Pechurkin // Advances in Space Research. - 2001. - Vol. 27, Is. 9. - P1563-1570, DOI 10.1016/S0273-1177(01)00247-2 . - ISSN 0273-1177
Кл.слова (ненормированные):
Biomass -- Carbon dioxide -- Ecosystems -- Life support systems (spacecraft) -- Photosynthesis -- Sewage treatment -- Soils -- Human microfloras -- Microorganisms -- carbon -- carbon dioxide -- artificial ecosystem -- article -- biomass -- bioreactor -- ecosystem -- human -- intestine -- metabolism -- microbiology -- microclimate -- plant root -- sewage -- wheat -- Biomass -- Bioreactors -- Carbon -- Carbon Dioxide -- Ecological Systems, Closed -- Ecosystem -- Environmental Microbiology -- Humans -- Intestines -- Life Support Systems -- Plant Roots -- Sewage -- Triticum -- Waste Disposal, Fluid
Аннотация: Functional, regulatory and indicator features of microorganisms in development and functioning of the systems and sustaining stability of three man-made ecosystem types has been studied. 1) The functional (metabolic) feature was studied in aquatic ecosystems of biological treatment of sewage waters for the reducer component. 2) The regulatory feature of bacteria for plants (producer component) was studied in simple terrestrial systems "wheat plants-rhizospheric microorganisms - artificial soil" where the behavior of the system varied with activity of the microbial component. For example with atmospheric carbon dioxide content elevated microbes promote intensification of photosynthesis processes, without binding the carbon in the plant biomass. 3) The indicator feature for the humans (consumer component) was studied in Life Support Systems (LSS). High sensitivity of human microflora to system conditions allowed its use as an indicator of the state of both system components and the entire ecosystem. В© 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Somova, L.A.; Pechurkin, N.S.

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Mathematical modeling of population dynamics of unstable plasmid-containing bacteria during continuous cultivation in a chemostat / V. V. Ganusov, A. V. Bril'kov, N. S. Pechurkin // Biofizika. - 2000. - Vol. 45, Is. 5. - С. 908-914 . - ISSN 0006-3029
Кл.слова (ненормированные):
article -- bioreactor -- Escherichia coli -- fermentation -- genetics -- growth, development and aging -- Photobacterium -- plasmid -- theoretical model -- Bioreactors -- Escherichia coli -- Fermentation -- Models, Theoretical -- Photobacterium -- Plasmids
Аннотация: A structural approach to studying the regularities of the population dynamics of unstable recombinant bacterial strains in a chemostat was elaborated. The approach is based on the mathematical modeling of cell distribution in a population with different numbers of plasmid copies. The effect of decreased selective preference of plasmidless variants of the recombinant strain in the chemostat, which is related to a decrease in the number of plasmid copies in cells upon long-term incubation was analyzed. It is shown that the time of half-elimination of plasmids from the bacterial population in the steady state in the chemostat T1/2 does not depend on the maximum number of plasmid copies in cells N but is determined only by the mean time of generation g and the probability of the loss of one plasmid copy tau. The dependence of the preference of bacterial plasmidless variants on the efficiency of expression of genes cloned into plasmids in chemostat was analyzed using the recombinant strain E. coli Z905, whose plasmids pPHL-7 contain cloned genes for the luminescence system of marine luminescing bacteria Photobacterium leiognathi.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russia. : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Ganusov, V.V.; Bril'kov, A.V.; Pechurkin, N.S.

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Colony structure of a consortium of nitrifying bacteria / A. P. Puzyr' [и др.] // Mikrobiologiya. - 2001. - Vol. 70, Is. 1. - P. 98-105 . - ISSN 0026-3656
Кл.слова (ненормированные):
Colony architectonics -- Electron microscopy -- Nitrifying bacteria -- article -- bacterium -- bioreactor -- culture medium -- electron microscopy -- growth, development and aging -- nitrogen fixation -- ultrastructure -- Bacteria -- Bioreactors -- Culture Media -- Microscopy, Electron -- Nitrogen Fixation
Аннотация: Colonies produced by a consortium of nitrifying bacteria were studied using light and electron microscopy. The colonies were obtained by direct plating of inoculum from a two-stage nonsterile chemostat fermentor and by repeatedly passing the microbial community of the fermenter through selective media containing ammonium or nitrite. The colonies studied can be characterized by a specific combination of six types of cells differing in their ultrastructure and spatial location within the colony. The types of cells occurring within a given colony were found to depend on the nitrogen compound present in the medium. As a result of our study, morphological features of colonial bacterial communities were preliminarily identified. The proposed approach can be viewed as a method to describe microbial associations and communities.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Puzyr', A.P.; Mogil'Naya, O.A.; Gurevich, Y.L.; Babkina, E.A.

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