2 Flashcards
commonly called broths, milk, or infusions, these are water-based solutions
that do not solidify at temperatures above the freezing point.
Liquid media
contain a solidifying agent such as 1.5%–2% agar, giving them a firm surface
on which cells can form discrete colonies.
Solid media
exhibit a clot like consistency at ordinary room temperature and contain
agar at concentrations of 0.5% or less that allows thickening of the media without producing a
firm substance.
Semi-solid media
contain chemically defined substances which are pure organic and/or
inorganic compounds.
Synthetic media
complex media that contain at least one ingredient that is not
chemically defined, which means that it is neither a simple or pure compound.
Non-synthetic media
are designed for primary isolation of a broad spectrum of microbes
and contain a mixture of nutrients that support the growth of both pathogenic and nonpathogenic organisms
General Purpose media
are designed to increase the number of desired microorganisms without
stimulating the rest of the bacterial population
Enrichment media
shows complete lysis of red blood cells resulting in complete
clearing around the colonies.
Beta hemolysis
shows incomplete lysis of red blood cells, producing a
greenish discoloration of the blood agar around the colonies
Alpha hemolysis
shows no hemolysis, resulting in no change in the
medium.
Gamma hemolysis