Query: NC_009615:1354122 Parabacteroides distasonis ATCC 8503 chromosome, complete genome Lineage: Parabacteroides distasonis; Parabacteroides; Porphyromonadaceae; Bacteroidales; Bacteroidetes; Bacteria General Information: Normal gastrointestinal bacterium. This group of microbes constitute the most abundant members of the intestinal microflora of mammals. Typically they are symbionts, but they can become opportunistic pathogens in the peritoneal (intra-abdominal) cavity. Breakdown of complex plant polysaccharides such as cellulose and hemicellulose and host-derived polysaccharides such as mucopolysaccharides is aided by the many enzymes these organisms produce. Parabacteroides distasonis is one of the most common fecal isolates, however, this organism is rarely isolated from clinical specimens.
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General Information: This strain is a freshwater organism and is extensively studied due to its circadian clock which controls the expression of upwards of 800 genes during a 24 hour period. These unicellular cyanobacteria are also known as blue green algae and along with Prochlorococcus are responsible for a large part of the carbon fixation that occurs in marine environments. Synechococcus have a broader distribution in the ocean and are less abundant in oligotrophic (low nutrient) regions. These organism utilize photosystem I and II to capture light energy. They are highly adapted to marine environments and some strains have evolved unique motility systems in order to propel themselves towards areas that contain nitrogenous compounds. An obligate photoautotroph, it has been studied extensively by an international research community with respect to acquisition of organic carbon, transport and regulation of nitrogen compounds, adaptation to nutrient stresses, and reponse to light intensity.