Abstract
The methanogenic activity in the presence ofEntodinium caudatum andEpidinium ecaudatum was well preserved after long-term cultivation. Microscopic observation revealed that methane production in the presence ofE. caudatum was probably caused by their intracellular methanogenic activity, while methane production in the presence ofE. ecaudatum f.caudatum etecaudatum could be atributed to both the methanogenic bacterial fraction of their external surface and their intracellular activity. Methane production per protozoan cell ofE. caudatum andE. ecaudatum was 2.1 nmol per cell per d and 6.0 nmol. per cell per d, respectively.E. caudatum was responsible for almost the entire methane production in the culture. The activity of free methanogens constituted approximately 50% of the total methane production in thee. ecaudatum culture. Decrease of digestibility of substrates and differences in the fermentation end products accompanied the inhibition of methanogenesis in both cultures by penicillin G. streptomycin, chloramphenicol, 2-bromoethanesulfonate, and pyromellitic diimideE. caudatum appeared to be more sensitive thanE. ecaudatum to the compounds tested. Hydrogen recoveries based on both volatile fatty acids and methane production suggested that the methanogenic population appeared not to be fully able to consume hydrogen produced in the protozoan cultures. The culture conditions tested were found to be suitable for experiments on the relationship between rumen ciliate and rumen bacteria.
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Kišidayová, S., Váradyová, Z., Zeleňák, I. et al. Methanogenesis in rumen ciliate cultures ofEntodinium caudatum andEpidinium ecaudatum after long-term cultivation in a chemically defined medium. Folia Microbiol 45, 269–274 (2000). https://doi.org/10.1007/BF02908958
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DOI: https://doi.org/10.1007/BF02908958