title: Minimum threshold for hydrogen metabolism in methanogenic bacteria.
abstract: Methanogenic isolates did not consume hydrogen below partial pressures of 6.5 Pa. Thus, in contrast to a previous report, results from pure-culture studies do not invalidate the threshold model for methane production from hydrogen in sediments.
authors.affiliation: Department of Anaerobic Microbiology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
authors.forename: D R
authors.initials: DR
authors.lastname: Lovley