negative control

neg·a·tive con·trol

regulation of an enzyme activity by an inhibitor of that enzyme or regulation of a protein by repression of transcription.

negative control

Lab medicine
A specimen or sample known to lack a particular substance, which is used as a standard for measuring a tested substance’s effect.

Molecular biology
The downregulation of gene transcription in response to the binding on DNA of negative regulatory elements.
References in periodicals archive ?
The low-dose group did not have significant difference with the negative control group past the 1st h suggesting that this dosage has a weak hypoglycemic effect.
Negative control group was treated with phosphate buffer saline (PBS) only.
In terms of TBV and total number of blood vessels (PBV + SBV + TBV), CAM of embryos treated with 5% extract displayed the lowest mean number, whereas those treated the negative control displayed the highest.
cepae and their effect on disease development, plant growth and various physiological parameters was studied in comparison with a negative control (without any addition of pathogen or plant material) and a positive control inoculated only with the fungus.
Data indicated that the PCE/NCE ratio in two FA exposure groups were statistically significant lower than the negative control group (P 0.
Therefore, all WSEB treatments, except for the negative control, included eave baffles fitted to all eave gaps, with and without exit traps, and identically treated screens fitted over all windows (Table; Figure 1).
Participants trained with the Standard and Semi-Standard MTS procedures that displayed both high within-class positive control and high between-class negative control had a high probability to form equivalence relations.
The rate of blastocyst development was analyzed 168 h after parthenogenetic activation, and there were no significant differences between the positive and negative control groups.
The percent reduction of resazurin to resorufin was calculated in comparison to a negative control which consists of media + alamarBlue with no cells.
Table 1 presents the Mitotic Indices obtained for the Positive Control, Negative Control and Jatoba Control treatment groups at concentrations of 0.