The phrase "a sample was expressed" is correct and usable in written English.
It can be used in contexts such as scientific research or data analysis when referring to the presentation or representation of a sample.
Example: "In the study, a sample was expressed to illustrate the findings of the experiment."
Alternatives: "a sample was presented" or "a sample was demonstrated".
The expression level of HO-1 mRNA in a sample was expressed as arbitrary units, which were determined by the formula 1AU = (HO-1 mRNA/GAPDH mRNA) × 100.
The hemagglutination titer (one hemagglutinating unit) of a sample was expressed as the reciprocal of the highest dilution exhibiting visible agglutination of rabbit erythrocytes (Li et al. 2008).
With these corrections, the concentration of each element (C) in a sample was expressed by the model: C = A − a b 1 R F rep F dil (1).
The relative amount of TNFα, IL-1α and IL 1β mRNA in a sample was expressed as a ratio versus the amount of mRNA for the housekeeping gene GAPDH.
The starting concentration of each transcript in a sample was expressed relative to the starting concentration of reference transcript.
The relative levels of target mRNAs in a sample were expressed as relative quantification normalised against GAPDH mRNA levels.
ΔCt was the difference in the Ct values derived from the specific genes being assayed and GAPDH, the N-fold differential expression in a specific gene of a tumor sample was expressed as 2ΔCt [ 23].
In order to present the relative changes in gene expression measured in qRT-PCR in the same scale as that found in microarray analysis the quantity of a transcript in one biological sample or state relative to that in a calibrating sample was expressed as log2 (fold change) in gene expression.
The relative gene expression level of each sample was expressed as a relative quantitation (RQ) value determined by the 2−ddCT method that represents the fold change in gene expression normalized to the housekeeping gene, Gapdh.
Finally, the fold change in the target gene of the sample was expressed as a ratio compared to the target gene expression in the empty vector control.
For inter-gel comparison, the optical density of proteins in each sample was expressed as a percentage of reference samples on a given gel, and these values were used for statistical analysis.
