 This differs from the usual behaviour of hydrogen oxidizing bacteria, which in general thrive strictly under microaerophilic conditions (<10% O2).This strain is also capable of coupling the hydrogen oxidation with the reduction of sulfur compounds such as thiosulfate and tetrathionate.Knallgas bacteria are a group of bacteria which are able to fix carbon dioxide using H2 as the electron donor and O2 as the terminal electron acceptor and energy source.