click below
click below
Normal Size Small Size show me how
Microbiology
First Aid - Microbiology
Question | Answer |
---|---|
Same btwn gram+ and gram- | flagellum, pilus, capsule, peptidoglycan, cytoplasmic membrane |
unique to gram positive | lipoteichoic acid (combo of lipids and teichoic acids), has a cell wall |
unique to gram negative | endotoxin, lipopolysaccharide outer membrane, periplasm |
mycoplasmas | have no cell walls (do not gram stain) , also contain sterols |
mycobacteria | TB, contain mycolic acid, high lipid content, detected by acid fast stain |
obligate aerobes | O2 dependent, ex. pseudomonas aeruginoasa (burns, diabetes, pneumonia), TB - reactivation of TB goes to apices of long b/c highest pO2 |
obligate anaerobes | lack catalase and/or superoxide dismutase susceptible to oxidative damage, normal flora in GI tract, but pathogenic elsewhere |
encapsulated bacteria | capsules serve as antiphagocytic virulence factor, capsule + protein conjugate serve as an antigen in vaccines, strep pneumoniae, H. flu, E.coli, salmonella, Klebsiella pneumonia. usually opsonized and cleared by spleen. asplenics at risk for severe dz |