Fraction

source

Found in the PeakData data format.

The corrected abundance of the labeled element in this PeakData as a fraction of the total abundance of this isotopomer in a PeakGroup for a particular compound. AccuCor calculates this as "Normalized", but Tracebase calculates this value as fraction to avoid confusion with other variables like normalized_labeling.

fraction = corrected_abundance / total_abundance

See:

• Corrected Abundance
• Total Abundance

Example

Alanine (C3H7NO2) measured with 13C and 15N labeling:

Labeled Element:Count	Corrected Abundance	Fraction
C:0; N:0	1090437	0.633529
C:0; N:1	154827.9	0.089953
C:1; N:0	0	0
C:1; N:1	0	0
C:2; N:0	3105.043	0.001804
C:2; N:1	0	0
C:3; N:0	33989.78	0.019748
C:3; N:1	438849.7	0.254966