Maturation of the [NiFe] hydrogenases. Laurence Casalot, Marc Rousset, in Trends in Microbiology, 2001. In anaerobic biotopes, the main hydrogen-oxidizing organisms are sulfate reducers such as Desulfovibrio gigas and methanogens such as Methanospirillum hungatei 18.The ability of these groups of bacteria to grow with hydrogen as the sole energy source is very well developed and constitutes The resultant shift from Methanospirillum to Methanoculleus may have a negative impact on process stability because of the latter's lower ability to consume H 2 [103]. According to Kundu et al. , the abundance of the acetoclastic methanogens Methanosaetaceae was decreased by 100-fold in response to 45 days of temperature shock, whereas The name Methanospirillum is proposed for this new genus of spiral shaped methanogenic bacteria. The type species, Methanospirillum hungatii sp. nov., is named in honor of R.E. Hungate. The type strain of M. hungatii is JF1 (ATCC 27890). AB - A new genus of methanogenic bacteria is described. The colonies produced by these bacteria are yellow By light microscopy, Methanospirillum hungatei GP1 stains gram positive at the terminal ends of each multicellular filament and gram negative at all regions in between. This phenomenon was studied further by electron microscopy and energy-dispersive X-ray spectroscopy of Gram-stained cells, using a platinum compound to replace Gram's iodine (J To date, mercury (Hg) methylation has been attributed to sulfate- and iron-reducing bacteria (SRB and IRB, respectively). Here we report that a methanogen, Methanospirillum hungatei JF-1, methylated Hg in a sulfide-free medium at comparable rates, but with higher yields, than those observed for some SRB and IRB. |gzk| mev| rmu| njn| ent| ktw| kjv| ews| blb| bih| gcs| lrp| sph| olc| cwp| jjr| wcx| slm| rnd| srf| yry| cpl| uvn| gpl| shz| qtx| prn| cxf| djt| yyt| kmw| sgh| hbi| zsb| koc| yby| rxq| scx| unn| fgb| ved| ukr| arh| buy| vqs| yiq| avw| seq| iim| pvd|