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The phylum Bacteroidetes is composed of three large groups of bacteria. By far, more is written about and known about the Bacteroides class, than the other two, the Flavobacteria and the Sphingobacteria classes. They are related by the similarity in the composition of the small 16S subunit of their ribosomes. Members of the bacteroides class are human commensals and sometimes pathogens. Rarely are members of the other two classes pathogenic to humans. Over 600 different species of yeast are known and they are widely distributed in nature. They are found in association with other microorganisms as part of the normal inhabitants of soil, vegetation, marine and other aqueous environments. Some yeast species are also natural inhabitants of man and animals. While some species are highly specialized and found only in certain habitats at certain times of the year, other species are generalists and can be isolated from many different sources. Click on following items to see more information: Anaerobic bacteria, Antibiotics, Antibiotics, Antimicrobial, Bacillus, Bacillus, Bacteria, Bacteriological, Bacteriophage, Beta lactamase, Burkholderia, Candida tropicalis, Cephalosporin, Clostridia, Denitrifying, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Escherichia coli, Enterococci, Fermentations, Yeasts, Growth media, Halophilic bacterium, Listeriosis, Microbial, Microbiological, Morganella, Paenibacilli, Prokaryotes, Pseudomonas aeruginosa, Rhizobacter, S. cerevisiae, Saccharomyces yeast, Salmonella typhimurium, Shigella, Staphylococcus aureus, Streptococci, Streptococci, Vibriosis, Yeasts The Proteobacteria are a major group of bacteria. They include a wide variety of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter, and many other notable genera. Others are free-living, and include many of the bacteria responsible for nitrogen fixation. The group is defined mainly in terms of ribosomal RNA sequences, and is named for the Greek god Proteus, who could change his shape, because of the great diversity of forms found in it. All Proteobacteria are Gram-negative, with an outer membrane mainly composed of liposaccharides. Many move about using flagella, but some are non-motile or rely on bacterial gliding. The last include the myxobacteria, a unique group of bacteria that can aggregate to form multicellular fruiting bodies. There is also a wide variety in the types of metabolism. Most members are anaerobic and heterotrophic, but there are numerous exceptions. P. aeruginosa usually causes problems to humans who have already have had their immune systems weakened. This bacteria usually infects the urinary tract, burns, wounds, and also causes other blood infections. One in ten hospital acquired infections is from Pseudomonas. Cystic fibrosis patients are also predisposed to aeruginosa infection of the lungs.
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