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19 Cards in this Set
- Front
- Back
Proteobacteria
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most gram-negative chemoheterotrophic bacteria. largest taxonomic group of bacteria. phylogeny based upon rRNA similarities. subgroups designated by Greek letters.
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Alpha Proteobacteria
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includes most proteobacteria capable of growth with low nutrient levels. some have prosthecae(bud-like protusions). some agriculturally important(nitrogen fixation). some plant and human pathogens.
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Rickettsia
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gram-negative rod-shaped bacteria or coccobacilli. obligate intracellular parasites. transmitted to humans by bites of insects and ticks. infections damage permeability of blood capillaries resulting in a spotted rash.
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Rickettsia prowazekii
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organism that causes the disease epidemic typhus(human body lice).
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Rickettsia rickettsii
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organism that causes the disease Rocky Mountain Spotted Fever. transmitted by ticks.
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Ehrlichia
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gram-negative rickettsialike bacteria. obligate intracellular parasites. live within white blood cells. transmitted by ticks to humans. causes ehrilichiosis, a sometimes fatal disease.
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Bartonella
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gram-negative baccilus. human pathogen. Bartonella henselae causes cat-scratch disease.
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Brucella
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small nonmotile gram-negative coccobacilli. obligate parasites of mammals. can survive phagocytosis, an important element of body's defense against bacteria. Brucellosis is disease that is caused.
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Beta Proteobacteria
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some overlap with alpha-proteobacteria. can use hydrogen gas, ammonia, and methane for nutrient production. some are pathogenic.
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Bordetella
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nonmotile, aerobic, gram-negative rod. serious pathogen. Bordetella pertussis is the cause of pertussis, or whooping cough.
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Neisseria
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aerobic, gram-negative cocci. usually inhibits the mucous membranes of mammals. pathogenis species include Neisseria gonorrhoeae, the causative agent of gonorrhea and Neisseria meningitidis, the causative agent of meningoccal meningitis.
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Gamma Proteobacteria
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largest subgroup and most diverse of proteobacteria.
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Francisella
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small gram-negative rod. human pathogen. transmitted by wild animals and anthropods. Francisella tularensis causes the disease tularemia.
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Pseudomonas
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aerobic, gram-negative rod. motile by polar flagella. common in soil and other natural environments. resistant to many antibiotics. opportunistic pathogen. causes food spoilage. Pseudomonas aeruginosa produces blue-green pigment.
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Moraxella
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strictly aerobic coccobacilli. human pathogen. Moraxella lacunata is implicated in conjunctivitis.
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Legionella
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aerobic, gram-negative rod. human pathogen. common in streams and can grow in water-supply lines. Legionella pneumophila causes the disease legionellosis, a bacterial pneumonia.
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Coxiella
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obligate intracellular parasites. cattle ticks harbor the organism making it commonly transmitted by aerosols or contaminated milk. Coxiella burnetti causes Q fever(a bacterial pneumonia)
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Vibrio
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facultative anaerobic, gram-negative rods that are often curved. human pathogen. transmitted mostly by raw or undercooked shellfish. Vibrio cholerae causes cholera, characterized by profuse, watery diarrhea. Vibrio parahaemolyticus causes less severe gastroenteritis.
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Escherichia
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facultative anaerobic, gram-negative rod.
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