Most organisms use oxygen to convert food into energy. However, in environments with little or no oxygen, life had found other ways to produce energy, using a process called fermentation. To better understand the range of bacteria and archaea that rely on this form of metabolism, researchers at UC Davis and UC Santa Barbara recently compiled a list of with more than 8,300 organisms from multiple sources, including the DOE Joint Genome Institute (JGI) and the DOE Systems Biology Knowledgebase (KBase). The researchers also built an interactive browser that allows other researchers to study the genomes and predict the metabolic abilities of microbes that are likely to thrive in environments with little or no oxygen.