Glossary Terms (Simple List)
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Trend Analysis
Analysis of environmental data over time indicating a shift; adverse trends require investigation. (TR70)
A review performed in response to an alert or action condition. This review provides an analysis of specific environmental monitoring data to identify adverse trends.(TR13)
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True Copy (FDA)
21 CFR 211.180(d) requires records to be retained "either as original records or true copies such as photocopies, microfilm, microfiche, or other accurate reproductions of the original records". Electronic copies can be used as true copies of paper or electronic records, provided the copies preserve the content and meaning of the original or raw data, which includes associated metadata and the static or dynamic nature of the original records.(TR80)(TR84)
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True Copy (MHRA)
A copy (irrespective of the type of media used) of the original record that has been verified (i.e., by a dated signature or by generation through a validated process) to have the same information, including data that describe the context, content, and structure as the original.(TR80)(TR84)
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True Copy (WHO)
A true copy is a copy of an original recording of data that has been verified and certified to confirm it is an exact and complete copy that preserves the entire content and meaning of the original record including, in the case of electronic data, all essential metadata and the original record format as appropriate.(TR80)(TR84)
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Tub
Plastic box that contains a vertically oriented syringe nest and is sealed with a lid. (TR73)
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Turbidity
Finely dispersed particles causing cloudiness or haziness in water or other fluid. Turbidity may be measured using a nephelometer. (TR45)
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Turbulent Flow
Movement of a fluid in which its velocity at any point varies in a random or erratic (nonlaminar) manner. (TR69)
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Two One-Sided T-Test
A method for declaring the comparability of equivalence that is built around comparing two or more group means and their respective mean difference confidence intervals against predetermined equivalence limits. (TR57-2)
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Tyndall Lighting
Collimated lighting at right angle to the viewing direction, typically against a black or dark background, which is useful during manual visual inspection to detect fine dispersions of small particulate that scatter the light making them more detectable. (TR79)
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Ultracentrifugation
Subjection of material to an exceedingly high g-force. The technique can be used to band or sediment virus particles. (TR47)