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14 Cards in this Set
- Front
- Back
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What is bacterial interference?
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-Normal flora prevent infection by more pathogenic organisms.
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What are the common oral flora and one found majorly in caries
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-Most common viridans streptococci (Gram +, facultiatively anaerobic cocci)
-S. mutans in caries |
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What organism is found in skin?
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-Skin: Propionibacterium acnes, Staphylococcus epidermidis, diptheroids (transient colonization of S. aureus)
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What organism is found in Oral cavity?
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-Viridans streptococci, Lactobacillus, Prevotella melaninogenicus, Actinomyces species, Peptostreptococcus species, Candida spp.
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What organism is found in nasopharynx?
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-Oral organisms, transient colonization by S. pneumoniae, Haemophilus species, Neisseria meningitidis
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What organism is found in Colon?
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-Bacteroides species, Clostridium species, Fusobacterium species, E. coli, Proteus species, Pseudomonas aeruginosa, Enterococcus species, other bacteria and yeasts
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What organisms is found in Vagina?
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-Childbearing years: Lactobacillus species, yeasts, Streptococcus species
-Prepuberty/Postmenopause: colonic and skin flora |
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What enzyme production can bacteria produce?
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-Hyaluronidase: break down hyaluronic acid to aid in digestion of tissue
-Protease: Digest protein to enhance the spread of infeciton -Coagulase: allows coagulation of fibrogen to clot plasma -Collagenase: breaks down collagen (CT) |
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Describe the different toxins produced by bacteria?
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-Exotoxin: protein, Gram +&-, Released extracellularly, Heat labile
-Endotoxin: lipopolysaccharides, Gram -, Part of outer membrane; not secreted, Heat stabile |
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What is the only bacteria do not have cell walls?
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-Mycoplasmas ureaplasma
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How is mycoplasmas and Chlamydia resistant to beta-lactam antibiotics (penicillin or cephalosporins)?
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-Mycoplasmas (ueraplasma) have NO cell wall
-Chlamydia lack muramic acid on cell wall |
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Describe the general properties of prokaryotic (single-celled = bacteria)
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-70S ribosomes (30S and 50S)
-Naked, single, circular chromosome (no true nucleus) -Lack membrane-bound organelles -Flagella- motility -Pili or Fimbraie-attachment to host cells, need in conjugation in G -. -Cell wall: peptidoglycan allows for staining. |
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What is Acid-fast staining?
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-Based on the ability to resist acid decolorization due to high content of waxes in the cell wall.
-Mycobacteria is acid fast and Nocarida is partially acid fast |
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Prokaryotic flagella do NOT have 9+2 microtuble arrangment found in eukaryotes and do NOT have microtubules (T/F)
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True
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