title: [Gas-exchange profiles of different algae communities as applied to biological system of human life support].
abstract: Previous modeling of the human-chlorella-microorganisms system showed that the absolute balance of atmospheric oxygen and carbon dioxide is unattainable because of inequality of the human respiration factor and chlorella assimilation factor. Analysis of patterns of gas-exchange regulation in a system with open trophic human-algae interrelations revealed that the sine qua non condition for this balance is identity of synthesized algal biomass and digestible part of human ration which is impractical with cultivation of only one algal species. We undertook experimental testing of this supposition with three algae communities: chlorella-chlamydomonas, spirulina-chlamydomonas and spirulina-chlamydomonas-clorella during accumulative cultivation. Investigation of their gas-exchange profiles made it clear that the assimilation factor of such photosynthetic component varies with community structure. The data can be useful in choosing the algae species and specifying their ratio that would permit to keep good balance of oxygen and carbon dioxide in atmosphere of closed systems.
authors: E L
authors: EL
authors: Nefedova
authors: M A
authors: MA
authors: Levinskikh
mesh_terms: D001272:Atmosphere; D002245:Carbon Dioxide / Q000378:metabolism; D002708:Chlorella / Q000378:metabolism*; D018504:Ecological Systems, Closed; D006801:Humans; D010100:Oxygen / Q000378:metabolism; D010788:Photosynthesis; D018531:Spacecraft
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen