title: Special issue on Fourth International Symposium on Closed Ecological Systems: Biospherics and Life Support.
mesh_terms: D018504:Ecological Systems, Closed; D004780:Environment, Controlled; D005160:Facility Design and Construction; D008021:Life Support Systems; D018535:Mars; D016081:Moon; D013026:Space Flight / Q000639:trends; D018505:Waste Management / Q000379:methods; D014893:Weightlessness