The phrase "as fold difference" is not correct and does not make sense in written English.
It seems to be a misinterpretation or typo, and without context, it is unclear what it is intended to convey.
Example: "The results showed a significant change in performance, but the as fold difference was not clearly defined."
Alternatives: "as a factor difference" or "as a multiple difference".
In addition, we found that the probe expression levels, typically expressed as fold difference between probe and mismatch probe are problematic to compare between ORFs with differing GC content.
Results were presented as fold difference of the mean compared to the control (ΔΔCt).
Data is presented as fold difference compare to the control and the error bars represent SDEV (n = 8).
An individual sample from the control group was arbitrarily assigned as a calibrator against which all other samples were expressed as fold difference.
Results were normalized with Pgk1 as the endogenous control, and expressed as fold difference from the vehicle-injected WT mice, as previously reported [41], [42].
qRT-PCR data is presented as fold difference of expression in H37Ra relative to H37Rv using the 2−ΔΔCt method as described previously [34] with a 71 bp product (henceforth called rrnAP1) from the promoter region of rrnS (Rvnr01) in Mtb [35] and dnaK used as normalizing genes.
Expression of ATF6 mRNA relative to β-actin (data presented as fold differences) was determined using the 2(−ΔΔCt) method (details on primers are shown in Table 3).
Data are expressed as fold differences between means and were considered significant at P<0.05.
Data are presented as fold differences of mean normalised expression values ± standard error of mean (SEM).
CT (threshold cycle) values for each sample were expressed as "fold differences", calculated relative to control diet and normalized for each gene against those obtained for 18S.
For the quantification of ENT4 in UV9, UF5 and UED5 cells, the level of ENT4 transcripts (normalized to GAPDH) in the absence of tetracycline was expressed as fold differences to the level of ENT4 in the presence of tetracycline (arbitrarily set to 1).
