|At Nymph creek, we saw healthly biomass of putative Aquificales. The sample we collected and then analyzed by PCR (using 16S rDNA primers specific for the Aquificales, below), we showed that indeed these organisms are members of the order, Aquificales. Since they are growing so well at low pH, they are probably related to the only acidophilic Aquificales isolate, Hydrogenobaculum acidophilum.
||At "New Pit", Mammoth Terraces, the microbial mats we saw were composed primarily of 2 different anoxygenic phototrophs: the purple sulfur bacterium- Chromatium, a proteobacterium, and the green sulfur bacterium, Chlorobium. Recall that these phototrophs do not evolve oxygen during photosynthesis, but rather produce sulfur as a biproduct of photosynthesis.