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Unformatted text preview: 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. take the bacteria in by phagocytosis and reproduction occurs inside the cell by binary fission....
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.
- Fall '09