title: [The metabolic interactions between Paramecium bursaria Ehrbg. and Chlorella spec. in the Paramecium bursaria-symbiosis. I. The nitrogen and the carbon metabolism (author's transl)].
abstract: Symbiotic Chlorellae have been isolated from Paramecium bursaria Ehrbg. and cultivated under conditions of nitrogen deficiency. Reinfection of Chlorella-free Paramecium bursaria with these nitrogen-deficient algae resulted in a complete regeneration and multiplication of the algae within the host cells. The endosymbiotic algal cells of the Paramecium bursaria-symbiosis can be supplied by their host with nitrogen. The inhibition of photosynthesis by 3-(3,4-Dichlorophenyl)-1,1-dimethylurea (DCMU) leads in green Paramecium bursaria to a breakdown of the symbiotic steady state-system resulting in a loss of algal cells. Obviously the endosymbiotic algae cannot be fed heterotrophically by their host to such an extent that a stable symbiosis is maintained. The application of 3-(3,4-Dichlorophenyl)-1,1-dimethylurea (DCMU) can be used as a new method for culturing Chlorella-free Paramecium bursaria.
mesh_terms: D002708:Chlorella / Q000378:metabolism*; D004237:Diuron / Q000494:pharmacology; D009584:Nitrogen / Q000378:metabolism; D010247:Paramecium / Q000302:isolation & purification / Q000378:metabolism*; D010788:Photosynthesis; D013559:Symbiosis / Q000187:drug effects
chemical_list: D004237:Diuron; D009584:Nitrogen
vernacular_title: Die stoffwechselphysiologischen Beziehungen zwischen Paramecium bursaria Ehrbg. und Chlorella spec. in der Paramecium bursaria-Symbiose. I. Der Stickstoff- und der Kohlenstoff-Stoffwechsel