Lowering the formic acid concentration did not significantly change the retention times, but it can lead to a lower background signal and higher sensitivity [ 34].
However, these differences would lead to a higher background risk for contralateral breast cancer and worse survival in the CPM group and therefore might only strengthen our findings.
Reflections from the fiber faces and optical components lead to a significant background signal that uses up dynamic range of the camera and limits the available range of the desired interference signal.
This is particularly evident since they appear to be ubiquitously distributed throughout the water pathway and can thus lead to an increased background contamination of the environment.
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Second, irradiation of the substrate (e.g., glass) might lead to an increased background fluorescence.
An elevated spectral background signal is a persistent issue when dealing with lignocellulosic biomass fermentation processes – lignin is made up of highly conjugated phenolic groups [ 13], which can lead to an elevated background signal in the same spectral region as the compounds of interest, potentially masking the Raman features of the spectra [ 14].
The longer emission wavelengths lead to a reduction of background auto-fluorescence and substantially increase tissue penetration.
Accurately defined, constant experimental conditions across all experiments as well as their parallel conduction probably have lead to a relatively consistent background level across all samples.
In later experiments where mutants were re-analyzed in replicates, a second batch of anti-CP5 antibodies with a higher degree of purity was used, which lead to a reduction of background signals to ± 0.20 (measured against air, i.e., including absorbance of the polystyrene plate and buffer), independent of the type of pglB expression plasmid.
