Acetobacter

Acid-producing, nitrogen-fixing bacteria that are associated with plants. They are able to fix atmospheric nitrogen under aerobic (oxygen present) conditions. Acetobacter also plays a role in the fermentation of vinegar from rice (komesu in Japanese).

Acinetobacter

Aerobic, non-fermentative bacteria that occur widely in water, soil and living organisms. They occur naturally on the human skin but can cause disease, especially through open wounds contaminated by soil. This has been a problem in war situations where these types of wounds occur. Acinetobacter species also exist in hospitals where they can be a source of infection for patients with low disease resistance thresholds. In general, Acinetobacter species do not cause disease in healthy individuals but in immunocompromised patients they can cause pneumonia, meningitis, bacteremia (bacteria in the blood), and skin and wound infections.

Aeromonas

Termed a facultative anaerobe, because it can exist in the presence of oxygen and use oxygen  for aerobic respiration, but it can also exist in anaerobic (non-oxygenated) conditions where it derives its energy from fermentation of organic substances such as carbohydrates. Found abundantly in fresh and brackish water, as well as in food. Can cause disease in humans in that it is one of the bacteria that can cause gastroenteritis (inflammation of the gut) with accompanying diarrhea, and wound infections. Can also cause disease in fish and frogs that are exposed to stressful conditions. About 14 species have been described.

Agrobacterium

Alcaligenes

Alcanivorax

Anabaena

Aquifex

Arthrobacter

Azoarcus

Azotobacter

Bacillus

Bacteroides

Bartonella

Bdellovibrio

Beggiatoa

Bifidobacterium

Bordetella

Borrelia

Bradyrhizobium

Brucella

Burkholderia

Campylobacter

Candidatus

Chloracidobacterium

Caulobacter

Chlamydia

Chlorobium

Chloroflexus

Chroococcus

Clostridium

Corynebacterium

Coxiella

Dehalobacter

Deinococcus

Desulfosarcina

Desulfovibrio

Desulfuromonas

Enterobacter

Enterococcus

Epulopiscium

Erysipelothrix

Erythrobacter

Erythromicrobium

Escherichia

Flavobacterium

Flexibacter

Frankia

Fusobacterium

Gallionella

Gemmata

Geobacter

Halomonas

Helicobacter

Klebsiella

Lactobacillus

Legionella

Leptospira

Leptospirillum

Leptothrix

Listeria

Marinobacter

Magnetotactic

Merismopedia

Methylobacterium

Micrococcus

Mitochondria

Mycobacterium

Mycoplasma

Myxococcus

Neisseria

Nitrosococcus

Nitrosomonas

Nitrospira

Nostoc

Pasteurella

Petrotoga

Pirellula

Planctomyces

Pleurocapsa

Porphyromonas

Prevotella

Prochlorococcus

Prochloron

Propionibacterium

Prosthecobacter

Prosthecomicrobium

Proteobacteria

Providencia

Pseudomonas

Psychrobacter

Rhizobium

Rhodobacter

Rhodopseudomonas

Rhodospirillum

Rickettsia

Roseobacter

Ruminobacter

Ruminococcus

Salmonella

Shigella

Sinorhizobium

Sphaerotilus

Sphingomonas

Spirillum

Spirulina

Staphylococcus

Streptococcus

Streptomyces

Succinomonas

Succinivibrio

Synechococcus

Thermodesulfobacterium

Thermotoga

Thermus

Thiobacillus

Thiocapsa

Thiomargarita

Treponema

Trichodesmium

Verrucomicrobium

Vibrio

Wigglesworthia

Wolbachia

Xanthomonas

Yersinia