Microbiology 16

Front 1

the most frequently used method of measuring bacterial populations, which measures the number of viable cells:

Back 1

plate counts

Front 2

when the quantity of bacteria is very small as in lakes or relatively pure streams, bacteria can be counted by:

Back 2

filtration

Front 3

statistical estimating technique that is based on the fact that the greater the number of bacteria in a sample the more dilution is needed to reduce the density to the point at which no bacteria are left to grow in the tubes in a dilution series:

Back 3

the most probable number method

Front 4

a measured a volume of a bacterial suspension is placed within a given client area on a microscope slide -- this method is often used to count the number of bacteria in milk

Back 4

direct microscopic count

Front 5

indirect methods of estimating bacterial numbers:

Back 5

turbidity, metabolic activity, dry weight

Front 6

culture media purpose -- growth of chemoautotrophs and photoautotrophs; microbiological assays

Back 6

chemically defined

Front 7

culture media purpose -- growth of most chemoheterotrophic organisms:

Back 7

complex media

Front 8

culture media purpose -- growth of obligate anaerobes:

Back 8

reducing media

Front 9

culture media purpose -- suppression of unwanted microbes; encouraging desired microbes:

Back 9

selective media

Front 10

culture media purpose -- differentiation of colonies of desired microbes from others:

Back 10

differential media

Front 11

culture media purpose -- similar to selective media, but designed to increase number of desired microbes to detectable levels:

Back 11

enrichment media