HARRY J. ALVIS
The ecology of sealed chambers can be divided into three levels of self-sufficiency. There is the simplest level, that of sealing the subject or subjects in with some oxygen, some carbon dioxide absorbent, some food and water, and leaving them there as long as they can manage to survive. The second level may be described as partially regenerative. The food supply is finite, but the processes of providing oxygen, removing carbon dioxide, and providing water are regenerative and can continue indefinitely. In this system, waste is thrown away.
The third and highest level is that of the closed ecologic system.
ALVIS HJ. ECOLOGY OF SHIPS OF INNER SPACE1. Ann Intern Med. 1959;51:1329–1334. doi: 10.7326/0003-4819-51-6-1329
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Published: Ann Intern Med. 1959;51(6):1329-1334.
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