Spread-plate method Solid agar Incubate Culture, diluted as needed Bacterial colonies 0.1-0.2 mL appear only on surface. Spread cells onto surface of pre-poured solid agar. Pour-plate method 0.1-1.0 mL Melted cooled agar Incubate FIGURE 4.18 Spread Plates and Pour Plates Some colonies appear on surface; many are below surface. These techniques can be used for plate counts. Add melted cooled agar and swirl gently to mix.

Basic Clinical Laboratory Techniques 6E
6th Edition
ISBN:9781133893943
Author:ESTRIDGE
Publisher:ESTRIDGE
Chapter7: Basic Clinical Microbiology
Section7.4: The Gram Stain
Problem 5RQ
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Why are the results of plate counts expressed as the number of colony-forming units, rather than the number of cells?

Spread-plate method
Solid agar
Incubate
Culture, diluted
as needed
Bacterial colonies
0.1-0.2 mL
appear only on surface.
Spread cells onto surface
of pre-poured solid agar.
Pour-plate method
0.1-1.0 mL
Melted cooled agar
Incubate
FIGURE 4.18 Spread Plates and Pour Plates
Some colonies appear on
surface; many are below surface.
These techniques can be used for plate counts.
Add melted cooled agar
and swirl gently to mix.
Transcribed Image Text:Spread-plate method Solid agar Incubate Culture, diluted as needed Bacterial colonies 0.1-0.2 mL appear only on surface. Spread cells onto surface of pre-poured solid agar. Pour-plate method 0.1-1.0 mL Melted cooled agar Incubate FIGURE 4.18 Spread Plates and Pour Plates Some colonies appear on surface; many are below surface. These techniques can be used for plate counts. Add melted cooled agar and swirl gently to mix.
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