a-PROTEOBACTERIA

Domain     Bacteria

Phylum     Proteobacteria

Class        a-proteobacteria

Includes most organisms  growing in low level  nutrient environments, unusual morphology, prosthecae, ag. important/N-fix., plant/human  pathogens

                      AZOSPIRILLUM

Domain     Bacteria

Phylum     Proteobacteria

Class       a-proteobacteria

Order       Rhodospirillales

Family      Rhodospirillaceae

 Genus      Azospirillum

Azo- refers  to  N-fixing ag important, tropical  grasses, sugar  cane, corn 

            ACETOBACTER/GLUCONOBACTER  

Domain   Bacteria
Phylum   Proteobacteria
Class      a-Proteobacteria
Order      Rhodospirillales
Family    Pseudomonadaceae
Genus    Acetobacter

Industrially  important org.,  aerobic, converts ethanol to acetic  acid (vinegar), can destroy wine, used to intentionally acidify beer

                        RICKETTSIA

Domain   Bacteria
Phylum   Proteobacteria
Class      a-Proteobacteria
Order      Rickettsiales
Family    Rickettsiaceae
Genus    Rickettsia

 non-motile, G-, non-sporeforming, pleomorphic  cocci/rods/thread-like, obligate intracellular parasites, reproduce in mammalian cells,  @ tetracycline  parasites by  ticks, fleas, lice; typhus, rickettsialpox, Boutonneuse fever, Rocky Mountain spotted fever grow only in living cells

                       EHRLICHIA 

Domain  Bacteria
Phylum  Proteobacteria
Class     a-Proteobacteria
Order     Rickettsiales
Family   Ehrlichiaceae  

Genus    Ehrlichia

Rickettsialike G-, obligate within wbc, transmitted  by ticks, ehrlichiosis

[Rickettsiales,  endosymbionts,  mitochondria and related organelles developed from members of this group,  viruses might have developed from them]

         CAULOBACTER

Domain    Bacteria
Phylum    Proteobacteria
Class       A-Proteobacteria
Order       Caulobacterales
Family     Caulobacteraceae
Genus     Caulobacter

< nutr. aqua. envir. (lakes), stalked, > nutr. uptake, budding, prominent prosthecae 

                 HYPHOMICROBIUM

Domain    Bacteria
Phylum     Proteobacteria
Class       a-proteobacteria
Order       Rhizobiales
Family      Hyphomicrobiaceae

Genus      Hyphomicrobium

< nutrient aqua. environ. budding,   prosthecae,  rod-shaped with pointed ends, ovoid, or bean-shaped,

                     RHIZOBIUM

Domain   Bacteria
Phylum    Proteobacteria
Class      a-proteobacteria
Order      Rhizobiales
Family     Rhizobiaceae
Genus     Rhizobium/Agrobacterium group
 

G-, soil, agr., infect roots  leguminous Pl., form  nodules N fix. 

                      BARTONELLA

Domain  Bacteria
Phylum  Proteobacteria
Class    a-Proteobacteria
Order    Rhizobiales
Family  Bartonellaceae
Genus  Bartonella

(prev. Rochalimaea)  G-, Facultative intracellular parasites,  path., trans. ticks, fleas, sand flies and mosquitoes, 8 species/subspecies path.

                           BRUCELLA

Domain   Bacteria
Phylum    Proteobacteria
Class      a-Proteobacteria
Order      Rhizobiales
Family     Brucellaceae
Genus     Brucella

G-,sm. nonmotile coccobacilli, obligate parasites, cause brucellosis (fever, headache, night sweats, fatigue and anorexia) ,  zoonotic d., foodb/contact/inhal.( cattle, sheep, pigs)/ unpast. milk
 B. melitensis/abortus/suis/ovis/neotomae/pinnipediae.

                     NITROBACTER

Domain   Bacteria
Phylum   Proteobacteria
Class      a-Proteobacteria
Order     Rhizobiales
Family    Bradyrhizobiaceae
Genus    Nitrobacter

^{G-, rod-shaped, agr. chemoautotrophs important part of the nitrogen cycle,  oxidizing nitrite in the soil into nitrate.
NO2- + 1/2O2 -> NO3}

                      NITROSOMONAS

Kingdom Bacteria
Phylum   Proteobacteria
Class     B-Proteobacteria
Order     Nitrosomonadales
Family   Nitrosomonadaceae
Genus    Nitrosomonas

ellipsoidal soil bacteria. They are important in the Nitrogen cycle by transforming ammonium into nitrite.They obtain their energy from chemosynthesis ,by converting ammonia to nitrites.

                         WOLBACHIA

Domain  Bacteria
Phylum  Proteobacteria
Class    a-Proteobacteria
Order    Rickettsiales
Family   Rickettsiaceae
Genus   Wolbachia

genus of inherited (pathenogenesis) B. infects arthropod species (endosymbiotic),  high proportion of insects,  common parasitic microbes, potentially most common reproductive parasite in the biosphere, >16% of neotropical insect species carry bacterium; escape  usu. detection  methods