Phenomena and Processes [G] » Biological Phenomena [G16] » Ecological and Environmental Phenomena » Environment » Ecosystem » Ecological Systems, Closed
Health Care [N] » Environment and Public Health [N06] » Environment » Ecosystem » Ecological Systems, Closed
Health Care [N] » Environment and Public Health [N06] » Environment » Environment, Controlled » Ecological Systems, Closed
Systems that provide for the maintenance of life in an isolated living chamber through reutilization of the material available, in particular, by means of a cycle wherein exhaled carbon dioxide, urine, and other waste matter are converted chemically or by photosynthesis into oxygen, water, and food. (NASA Thesaurus, 1988) MeSH
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