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18 Cards in this Set
- Front
- Back
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Describe capsules.
Gram pos or neg? function? |
Capsule is non essential ( some bacteria don't have it)
can be slime layer, or glyococalyx sometimes Gram positive OR negative Function - protect against phagocytosis until opsonized; IMMUNOGENIC ( except Strep pyogenes - hyaluronic acid and type B N. meningitidis - silic acid NON IMMUNOGENIC) |
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Describe outer membrane
gram pos or neg? function? |
Gram NEGATIVE only
composed ot Liporotein, Porin and LPS (endotoxin) LPS - made up of O cantigen, core outer membrane protein , and Lipid A . Outer membrane proteins help with virulence and attachment - make harder to kill. |
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Describe cell wall
which special groups? |
Made of peptidoglycan
Gram pos - thick gram neg - thin Gram pos only have techoic acid - immunogenic, induces TNF alpha, IL 1 Acid fast only have mycolic acid |
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describe periplasmic space
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Gram neg only,
storage space between inner and outer membrane enzymes to break down lare molecules, and may have beta lactamase here |
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Function of bacterial endospores
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survival NOT reproductive (fungus is for reproduction)
adds resistance to chemicals, dessiccation, radiation, freezing and heat |
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Which growth media is required for anaerobes
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Thioglycolate
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Which growth media is required for corynebacteria - color?
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tellurite agar - black colonies
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Which growth media is required for vibrio cholerae
pH? |
TCBS (thiosulfate citrate bile salts Sucrose agar) Likes alkaline growth
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Which growth media is required for legionella
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Charcoal yest extract agar
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Which bacteria grow on chocolate agar?
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neisseria from normally steril sites
Haemophilus |
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what grows on thayer martin selective medium
what is thayer martin medium? |
neisseria from sites with normal flora.
thayer martin is a chocolate agar supplemented with Vanc, nustatin and colistitin to inhibit normal flora, including nonpathogenic neisseria |
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what growth REQUIREMENTS does mycoplasma need
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cholesterol and purines and pyrimidies
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what bacteria require cysteine for growth
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fransicella, brucella, legionella, paseurella NOT BORDATELLA Pertussis
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what growth requirements does haemophilus need, and what special medium does it grow in
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it NEEDs X(protoporphyrin) and Y(NAD)
gets it from lysed RBCs |
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which bugs are olbigate aerobes
what does that mean? |
they require oxygen, have no fermentative pathways.
Usually produce supraoxide dismutase mycobacterium psueodmonas bacillus |
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which bugs are microaerophilic? what does that mean?
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Campylobacter
helicobacter requires low but not full oxygen tension |
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what does it mean to be facultative anaerobe
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will respire o2, until o2 is complete, then ferment or respire anareobically
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which bugs are obligate anaerobes
what does that mean? |
they lack supraoxide dismutase
generally lack catalase they are fermenters cannot use O2 as terminal e- receptor Actinomyces, bacteroides, clostridium |
