Medical Micro Lab Practical - Sheet1.csv

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dromero337
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149729
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Medical Micro Lab Practical - Sheet1.csv
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2012-04-23 23:57:40
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Medical micro lab practicle
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lab practical
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  1. Colony Morphology Terms
    Form. View from above (overall appearance). Margin (border) surrounding the colony. Elevation.
  2. TSA plate
    General purpose media. Used to streak for isolation.
  3. MaConky (MAC)
    Selective for gram negative (G-) bacteria. Differential for lactose fermentation. Lactose fermentation will be indicated by purple pink colonies
  4. Escherichia coli
    Gram negative coccobacillus. Colony are small circular doomed colonies that are yellow in color.
  5. Staphlyococcus aureus
    Gram positive cocci in clusters. Colony are large and yellow in colory shiny. Opportunistic pathogen. Causes septicimia. skin infections. pneumonia. and endocarditis.
  6. Bacillus cereus
    Gram positive rodes in chains. Dull spreading colony
  7. Manitol Salt Agar (MSA)
    Used for isolation of halotolerant microbes such as S. aureus. Selective 7.5% NaCl. Differential is mannitol. If bacteria ferments mannitol medium turns yellow due to phenol red pH indicator.
  8. Blood agar (BA)
    Used for hemolysis types. growth of fastidious microbes. No selective agent. Differential agent usually 5% sheeps blood. An enriched media.
  9. Baird-Parker (B-P)
    Selective and differential for Staphylococcus aureus. Selective agents tellurite and glycine. Differential if tellurite is reduced forms grey/black colonies. Differential with EGG YOLK which will show a clearing around indicating proteolysis/lipase. S. aureus will appear shiny gray/black with zone of clearing possible opaque zone withing clear zone (lecthinase)
  10. MRSA media
    Used for the isolation of methicillin resistant S. aureus. Selective agent is OXACILLIN. No differential agent. Will only grow MRSA strains of S. aureus.
  11. Brain heart infusion agar (BHI)
    Used as a general purpose media. Growth for most bacteria. Not differential or selective.
  12. Staphylococcus genus
    Opportunistic pathogens. Are all catalase positive. Metabolism respiratory fermentative. Are facultative anaerobes. Are cocci .5 -1.5 um in singles. pairs. chains. irregular clusters. Most are catalase positive and oxidase negative. Found on skin mucous membrane dust water food.
  13. Micrococcus genus
    Rarely cause opportunistic infections. Metabolism is repiratory. Areobic oxygen requirements. Cocci 1-1.2 um irregular clusters tetrades packets (NEVER IN CHAINS). Catalse positive. Most are OXIDASE POSTIVE. Found in soil dust food mostly saprphytes sometimes on mammalian skin. SENSITIVE TO BACITRACIN
  14. Staphylococcus aureus metabolic tests
    Mannitol (+). NOVOBIOCIN (sensitive). BETA HEMOLYTIC. DNase (+). COAGULASE (+). Phophatase (+)
  15. Staphylococcus epidermidis metabolic test
    Mannitol (-). Novobiocin (sensitive). Hemolysis (gamma). DNase (-). Coagulase (-). PHOSPHATASE (+).
  16. Staphylococcus saprophyticus
    Mannitol ferm. (negative/variable). NOVOBIOCIN RESISTANT. Gama hemolysis. DNase negative. Coagulase negative. PHOSPHATASE NEGATIVE.
  17. Micrococcus luteus
    Pigment Yellow. Acid aerobic from glucose (negative). GELATIN HYDROLYSIS (+). Nitrate reduced to nitrates (-). OXIDASE (+).
  18. Micrococcus roseus
    Pigment production pink/orange/red. Acid (aerobic) from glucose POSTIVIE. Gelatin hydrolysis (-). NITRATE REDUCTION (+). Oxidase (-).
  19. Antiobiogram
    Conducted on Mueller-Hinton agar is used to test antibiotic susceptibility or resitance by measuring zone of inhibition.
  20. DNase
    An exoenzyme produced by some bacteria (S. aureus). A agar plate contains DNA polymers is broken down by DNase and creates nucleotides that react with dye to produce a METACHROMATIC EFFECT. Giving a PURPLE/PINK indicates a positive test.
  21. Staph latex kit
    contains very fine latex beads covered with fibrin and antibodies IgG. The coagulase will bind to fibrin and Protein A will bind to antibodies. This will show agglutination.
  22. Oxyicillin
    same as methycillin
  23. Beta-lactamase
    Exoenzymes produced by some bacteria used to break down the beta lactam ring on penicillin
  24. Streptococcus genus
    Gram positive chain in cocci. CATALASE NEGATIVE. Only fermentative. Grow in increased CO2 (not anaerobic) CAPNOPHOLIC. Cause oppoertunitic infections. Necrotizing fascitis. Sore throat. (pharyngitis). Endocarditis. Menigitis. Strep normally occuring in mouth. Are normally classified by Hemolysis and lancefield typing. Lancefield is are surages located on surface of bacteria used for identification. \
  25. Mitis-salivarius agar (Mit-Sal)
    Selective for Streptococcus and Enterococcus. Selective agents is TELLURITE is slective against Gram negatives. Differential agent is sucrose if bacteria ferment sucrose colonies turn blue. S. mitis creates small blue colonies. S. salivarius creates blue gumdrop shaped colonies. ENTEROCOCCUS SMALL BLACK COLONIES.
  26. Bile esculin agar (BEA)
    Used for the identification of Enterococcus. Selective agent is bile for enterococcus species. Differential agents Esculin will turn the media black. Also used for identification of listeria and bacteriodes.
  27. Carrot broth
    Used for isolation and enrichemnt of Group B strep. Selective agent unknown. Differential agent is starc. peptone. GBS produces pigment that turns the media brick red/organge. Used for identification of Streptococcus agalactiae from clinical specimens.
  28. MGP broth
    Differentation of vancomycin resistant enterococci. Differenetial using methyl-alpha-D glucopyranoside (MGP) if fermented yeloow color develops. E. FAECALIS AND E. FACEIUM ARE NEGATIVE. E. GALLINARUM AND E. CASSELIFAVUS ARE POSITIVE
  29. Streptococcus pyogenes
    BETA HEMOLYSIS. Bacitracian sensitive. LANCEFIELD A. PYR (+). Bile esculin (-). 6.5% NaCl (-). MB milk (-) Hippurate (-). CAMP (-)
  30. MB milk
    Used to identify Enterococcus. Will turn from a blue color to white in a postivie test. E. faecalis and E. faecium.
  31. Streptococcus agalactiae
    Weakly Beta hemolytic. BACITRACIAN RESISTANT. LANCEFIELD B. PYR (-). Bile (-). 6.5% NaCl (-). MB milk (-). HIPPURATE (+). ***CAMP (+)****. CARROT BROTH POSITIVE
  32. PYR
    Small disk place on the media and test for the presence of L-pyrolidonyl arylamidase. Used for the presumptive identification of group A ß-hemolytic streptococci Enterococcus strain. Rub bacteria on dish place on plate and let stand 3 minutes. Add PYR reagent. PINK (+).
  33. Streptococcus pneumoniae
    ALPHA HEMOLYSIS. OPTOCHIN SENSITIVE. PYR (-). Bile-Esculin (-). 6.5% Bile (-). BILE SOLUBILITY (+). MB milk (-). CAMP negative. MAKES A CAPSULE
  34. Streptococcus mitis
    ALPHA HEMOLYSIS. Optochin resistant. PYR (-). Bile-Esculin (-). 6.5% NaCl (-). Bile solubility (-). MB milk (-). CAMP (-). SMALL BLUE COLONIES ON MIT-SAL
  35. Streptococcus salivarius
    Alpha and Gamma hemolysis. Optochin resistant. PYR (-). 6.5% NaCl (-). Bile solubility (-). MB milk (-). CAMP (-). MAKE CAPSULE. LARGE BLUE GUM DROP COLONIES ON MIT-SAL
  36. Viridans
    S. mitis and S. salviaris are in this gorup.
  37. Enterococcus specific tests
    Bile esculin (black + result). MB milk reduces methyl blue to turn white (reduces milk). 6.5% NaCl Salt tolerant.
  38. Hippurate
    S. agalactiae. Uses wee tabs check to see if it hydrolyzes hippurate. Blue/purple color positive test. Inoculate sample incubate then add indicator dye and place in water bath 30 minutes
  39. Enterococcus faecalis
    gamma and beta hemolysis. Bacitracin Resistant. Optochin Resistant. LANCEFIELD TYPE D. Catlase (-). PYR (+). BILE-ESCULIN (+). 6.5% NACL (+). Bile solubility (-). MB MILK (+). Hipppurate (-). CAMP (-)
  40. Enterococcus faecium
    gamma and beta hemolysis. Bacitracin Resistant. Optochin Resistant. LANCEFIELD TYPE D. Catlase (-). PYR (+). BILE-ESCULIN (+). 6.5% NACL (+). Bile solubility (-). MB MILK (+). Hipppurate (-). CAMP (-)
  41. Distinguish between E. faecalis and E. faecium
    Fermentation of arabinose is often used. E. faecilius is negative.

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