Abstract
The experiment lasting half a year was with a crew of 3 men. The recovery of O2 and water was accomplished through photosynthetic process. A part of wheat and vegetables was also produced in the system. All the processes were controlled by the crewmen. The result obtained established beyond question that a small closed ecosystem is quite feasible. The possibility of biological systems to support the Life through closed substance turnover is their great advantage which should be realized at the coming stage of manned space activity. Solution obtained with developed ecosystems will find applications in the Earth as an important problem today concerning the protection of the Earth's large ecosystem from contamination by waste products.
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