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Glossary
Applied Biosystems 7500/7500 Fast Real-Time PCR System Getting Started Guide for Relative Standard Curve
and Comparative C
T
Experiments
216
amplification stage
Part of the instrument run in which PCR produces amplification of the target. The
amplification stage is called a cycling stage in the thermal profile and consists of
denaturing, primer annealing, and polymerization steps that are repeated.
For quantitation experiments, fluorescence data collected during the amplification stage are
displayed in an amplification plot, and the data are used to calculate results. For genotyping
or presence/absence experiments, fluorescence data collected during the amplification
stage are displayed in an amplification plot, and the data can be used for troubleshooting.
See also cycling stage.
assay
In the 7500/7500 Fast system, a PCR reaction mix that contains primers to amplify a target
and a reagent to detect the amplified target.
Assay ID
Identifier assigned by Applied Biosystems to TaqMan
®
Gene Expression Assays and
TaqMan
®
SNP Genotyping Assays.
assay information
file (AIF)
Data file on a CD shipped with each assay order. The file name includes the number from
the barcode on the plate. The information in the AIF is provided in a tab-delimited format.
assay mix
PCR reaction component in Applied Biosystems TaqMan
®
Gene Expression Assays and
TaqMan
®
SNP Genotyping Assays. The assay mix contains primers designed to amplify a
target and a TaqMan
®
probe designed to detect amplification of the target.
AutoDelta
In the run method, a setting to increase or decrease the temperature and/or time for a step
with each subsequent cycle in a cycling stage. When AutoDelta is enabled for a cycling
stage, the settings are indicated by an icon in the thermal profile:
• AutoDelta
on:
• AutoDelta
off:
automatic baseline
An analysis setting in which the software calculates the baseline start and end values for the
amplification plot. You can apply the automatic baseline setting to specific wells in the
reaction plate. See also baseline.
automatic C
T
An analysis setting in which the software calculates the baseline start and end values and
the threshold in the amplification plot. The software uses the baseline and threshold to
calculate the threshold cycle (C
T
). See also threshold cycle (C
T
).
baseline
In the amplification plot, a line fit to the fluorescence levels during the initial stages of PCR,
when there is little change in fluorescence.