- My team are currently trying to produce molecular hydrogen within an in vivo system. To do that we will introduce into R. etli a hydrogenase as well as other genes which imrpove the production of hydrogen; this hydrogenase belongs to a gruop of enzymes which contain Fe-S cores necessary for protons reduction. The activity of these enzymes is affected by O2, so for their proper functionality an anaerobic enviroment is needed. R. etli is a symbiont of the common bean Phaseolus vulgaris supplying N2 to the plant. To do it R. etli acquires a bacteroide conformation within structures located in the root of the bean, called nodules, where there is an anearobial microenviroment necessary for the production of N2, and also ideal for the production of H2.