PDA Technical Glossary
PDA Technical Reports are highly valued membership benefits because they offer expert guidance and opinions on important scientific and regulatory topics and are used as essential references by industry and regulatory authorities around the world. These reports include terms which explain the material and enhance the reader’s understanding.
The database presented here includes the glossary terms from all current technical reports. The database is searchable by keyword, topic, or by technical report. Each definition provided includes a link to the source technical report within the PDA Technical Report Portal.
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CFU: Genome Copy Ratio
The relationship between the number of colony forming units counted on solid media and the number of genome copies measured using a method suitable for quantitative assessment of genomic DNA. (TR50)
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Color Changing Unit (CCU)
The quantity of mycoplasma contained in the highest dilution of a test article that produces a color change in a pH-sensitive liquid medium (typically containing phenol red) within a specified time of incubation, used for end-point determination of growth. (TR50)
Source:
Comparability Study
An assessment of the similarities between the critical parameters and output results of two or more separate processes or methods. (TR50)