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Fecal specimens from 19 healthy humans were used to enumerate H 2 -utilizing microbial populations of methanogenic archaea (MA), acetogenic bacteria (AB) and sulfate-reducing bacteria (SRB). Eight subjects were methane (CH 4 ) excretors (CH 4 +) and 11 non CH 4 -excretors (CH 4 -), based on breath methane concentrations. The mean ± S.E. of the logarithm of...
A method is proposed that allows the enrichment and most probable number estimation of H 22 -utilizing acetogenic bacteria. It is based on the difference in acetate production for serial dilutions incubated under either a testH 22 (4:1), or a control N 22 (4:1) headspace atmosphere. A nutritionally non-selective medium was used, containing bromoethane-sulfonic...
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