Bacteriological studies of the feces from methane-producers and nonproducers in the expired air.

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Bacteriological studies of the feces from 4 methane-producers and 11 nonproducers in the expired air were made.In all methane-producers, methane was detectable after incubation of the fecal specimens and methanogenic bacteria were present in their feces.In 7 of the 11 methane-nonproducers, methane was not detectable after incubation of the fecal specimens and methanogenic bacteria were absent in the feces. In the remaining 4 cases, however, positive results were obtained in both tests. The latter cases may not excrete methane in the colon.A methanogenic bacterium was isolated for the first time from the feces of a Japanese methan-eproducer. It was classified to the genus Methanobrevibacter since it was an anaerobic, gram-positive and short rod bacterium.
財団法人日本消化器病学会の論文