ALPHA - ALPHAPROTEOBACTERIA PROTEOBACTERIA)...

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ALPHA-PROTEOBACTERIA ( α  -PROTEOBACTERIA)— this group includes most of the  proteobacteria that can grow with low levels of nutrients.  Some have unusual morphology Nitrogen-fixing bacteria are important in agriculture Several plant and human pathogens are included All are gram-negative The majority are rods, although other forms are also found a.  Azospirillum —organisms of this genus grow in soil in close association with the roots  of certain plants such as sugar cane, corn, and tropical grasses. These organisms fix  nitrogen.  b.  Acetobacter  and  Gluconobacter  both are used in industry to convert ethanol into vinegar  (acetic acid) c.  Rickettsia —rods or coccobacilli which are obligate intracellular parasites (reproduce only  inside a mammalian cell). Most are transmitted to humans by the bites of insects or ticks. Cells  take the bacteria in by phagocytosis and reproduction occurs inside the cell by binary fission. 
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