title: New problems to be solved for establishing closed life support system.
abstract: New test bed facilities such as Bioplex and CEEF have been constructed to test the new advanced technologies for solving the various problems as follows, (1) how to develop air content stabilization technologies with gas balance between the generation and the absorption by living organisms, (2) how to solve the mismatching between the assimilation rate of autotrophic organisms and the respiration rate of heterotrophic organisms, (3) how to balance the speed of the waste decomposition with the absorption speed of nutrient components in the sequential plant cultivation, (4) how to develop new nutrient adjusting subsystems for each plant species, (5) how to compensate the denitrification during the waste decomposition and anaerobic microbes in the nutrient solution.
authors.affiliation: Institute for Environmental Sciences, Aomori, Japan. nitta@ies.or.jp
authors.forename: Keiji
authors.initials: K
authors.lastname: Nitta
mesh_terms: D000389:Air Conditioning / Q000379:methods*; D000818:Animals; D001673:Biodegradation, Environmental; D002245:Carbon Dioxide / Q000378:metabolism; D018504:Ecological Systems, Closed; D004780:Environment, Controlled; D005069:Evaluation Studies as Topic; D006801:Humans; D008021:Life Support Systems; D009584:Nitrogen / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D010944:Plants / Q000378:metabolism; D013026:Space Flight / Q000295:instrumentation*; D018505:Waste Management / Q000379:methods; D014893:Weightlessness
chemical_list: D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen