Bräucker R, Machemer H and Fahn C (1999): A closed artificial ecosystem for ciliates.

ABSTRACT
MICROPOND is a minimalized ecosystem designed for the investigation of effects of long-term-microgravity in ciliates. The system is controlled automatically by a computer program. With the cell speciesStylonychiamytilus and Chlorogonium elongatum, the longest lasting experiment was stable for 48 days so far; a closed stand-alone culture of Chlorogonium has was continued for 197 days. During this time, important physical and chemical parameters of the system were controlled within acceptable limits.