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G01AD01
Source
TFDA
BacillatiFusobacteriatiPseudomonadatiThermotogati
And seetext
"Ca.Aegiribacteria""Aerosphaera""Anhaltia"ArchaeoscillatoriopsisCyanotheca"Eoleptonema""Ferrimonilis""Ca.Ferristratum""Hafniella""Hygrocrocis""Koukoulia""Magnoovum""Nonospora""Ca.Ovibacter""Plutoneptunites""Primaevifilum""Proteusbacillus""Ramacia""Rappaport""Sphingoterrabacterium""Terrahaemophilus""Thiodendron""Microvibrio marinus""Pedodermatophilus halotolerans""Pelosigma cohnii"
"Bacteria"(Cohn1872)Cavalier-Smith1983"Bacteria"Haeckel1894"Bacteria"Cavalier-Smith 2002"Bacteriaceae"Cohn 1872a"Bacteriobionta"Möhn 1984"Bacteriophyta"Schussnig 1925"Eubacteria"Woese and Fox 1977"Neobacteria"Möhn 1984"Schizomycetaceae"de Toni and Trevisan 1889"Schizomycetes"Nägeli 1857
Bacteriaare ubiquitous, mostly free-living organisms often consisting of onebiological cell. They constitute a largedomainofprokaryoticmicroorganisms. Typically a fewmicrometresin length, bacteria were among the first life forms to appear on Earth, and are present in most of itshabitats. Bacteria inhabit the air,soil, water,acidic hot springs,radioactive waste, and thedeep biosphereofEarth's crust. Bacteria play a vital role in many stages of thenutrient cycleby recycling nutrients and thefixation of nitrogenfrom theatmosphere. The nutrient cycle includes thedecompositionofdead bodies; bacteria are responsible for theputrefactionstage in this process. In the biological communities surroundinghydrothermal ventsandcold seeps,extremophilebacteria provide the nutrients needed to sustain life by converting dissolved compounds, such ashydrogen sulphideandmethane, to energy. Bacteria also live inmutualistic,commensalandparasiticrelationships with plants and animals. Most bacteria have not been characterised and there are many species that cannot begrownin the laboratory. The study of bacteria is known asbacteriology, a branch ofmicrobiology.
Like all animals, humans carry vast numbers (approximately 1013to 1014) of bacteria.Most are in thegut, though there are many on theskin. Most of the bacteria in and on the body are harmless or rendered so by the protective effects of theimmune system, and many arebeneficial,particularly the ones in the gut. However, several species of bacteria arepathogenicand causeinfectious diseases, includingcholera,syphilis,anthrax,leprosy,tuberculosis,tetanusandbubonic plague. The most common fatal bacterial diseases arerespiratory infections.Antibioticsare used to treatbacterial infectionsand are also used in farming, makingantibiotic resistancea growing problem. Bacteria are important insewage treatmentand the breakdown ofoil spills, the production ofcheeseandyogurtthroughfermentation, the recovery ofgold,palladium,copperand other metals in the mining sector (biomining,bioleaching), as well as inbiotechnology, and the manufacture of antibiotics and other chemicals.
Once regarded asplantsconstituting the classSchizomycetes("fission fungi"), bacteria are now classified asprokaryotes. Unlike cells of animals and othereukaryotes, bacterial cells contain circular chromosomes, do not contain anucleusand rarely harbourmembrane-boundorganelles. Although the termbacteriatraditionally included all prokaryotes, thescientific classificationchanged after the discovery in the 1990s that prokaryotes consist of two very different groups of organisms thatevolvedfrom anancient common ancestor. Theseevolutionary domainsare called Bacteria andArchaea.UnlikeArchaea, bacteria contain ester-linked lipids in the cell membrane,possess elongation factors that are resistant to ADP-ribosylation by diphtheria toxin,use formylmethionine in protein synthesis initiation,and have numerous genetic differences, including a different16S rRNA.