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Medium that allows growth of certain types of bacteria while permitting growth of another, bacterial isolation
Medium that allows one to distinguish between different microorganisms based on a difference in colony appearance (color, shape, or growth pattern) on a colony
MacConkeys agar is a good example of this because it contains bile salts and crystal violet which inhibit gram positive organisms and allow gram negatives to grow.
Mannitol salt agar
yellow means mannitol positive, pink means/ carbohydrate mannitol. Staphylococci exhibit yellow zone surrounding their growth. Change in coloration
media that have been supplemented with highly nutritious material, blood serum, yeast.
TSI Triple sugar-iron test
designed to differentiate among the different groups of genera of the enterobacteriaceae, which are all gram negative bacilli caple of fermenting glucose with production of acid.
No carbohydrate fermentation, Red/Red or orange, Alkaline/Alkaline or Alkaline/No change
groups of bacteria that are found in the intertinal tract of humans and lower mammals are classified as these members.
Citrate positive culture
Identified by the presence of growth on the surface of the slant and is accompanied by blue color.
Forming an insoluble black ferrous sulfide precipitate that is seen along the line of the stab inoculation and in indicative of H2S production.
Chemical substance that destroy or inhibit the growth of microorganisms in living tissue.
Influences its effects on microorganisms with higher concentrations producing a more rapid death.
length of exposure
All microbes are not destroyed within the same exposure time. Sensitive forms are destroyed more rapidly that resistant ones.
Conditions under which a disinfectant or antiseptic affects the chemical agent, Temperature, pH. type of material on which microorganisms exist.
Normal skin flora
Skin has staphylococci, streptococci, enterococci, diptheroid, bacilli, yeast and fungus.
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