The phrase "a concomitant decrease in the number" is correct and usable in written English.
It can be used when discussing a simultaneous reduction in quantity or frequency related to a specific subject or context.
Example: "The study revealed a concomitant decrease in the number of participants as the program progressed."
Alternatives: "an accompanying reduction in the number" or "a simultaneous decline in the number."
Immunohistochemical observations showed that the cell size of dopaminergic neurons in the VTA reduced significantly in the chronic morphine-treated rats with a concomitant decrease in the number of BDNF-positive cells compared to the saline-treated rats.
Consistent with the strong decrease in the level of 11-cis-retinal, Rpe65R91W/R91W mice suffer from S-opsin mislocalization at 1 month of age with a concomitant decrease in the number of S-opsin-positive cells with time [28].
Immunohistochemical analyses of microvessel density revealed a concomitant decrease in the number of tumor blood vessels.
The latter caused a concomitant decrease in the number of selected polymorphic markers from 631 to 384.
This increase was accompanied by a concomitant decrease in the number of cells in the G0/G1 phase (66.73% at 24 h, 63.33% at 48 h, 41.75% at 72 h) with prolonged exposure time.
10 Pathologically, the authors observed a decrease in the density of presynaptic proteins at the nerve terminals, a concomitant decrease in the number of synaptic vesicles at nerve terminals as well as subsequent neuronal degeneration.
However, when the differentiation of DA precursors was examined, we found a decrease in the numbers of TH+ and Pitx3+ cells at E13.5 without a concomitant decrease in the numbers of precursors (Nurr1+/TH−).
When this is done for study [ 10], the bias to count more interactions for abundant proteins is slightly reduced and there is a concomitant decrease in the association between evolutionary rate and the number of interactions (Table 1).
In public higher education, it has led to an increase in the number of poorly paid -- and poorly treated -- temporary faculty and a concomitant decrease in the population of tenured professors.
Additionally, we observed with increasing concentrations of Qtracker705 a concomitant decrease in the donor intensity.
Flowcytometric analysis with chrysin treatment caused an increase in G1 phase cells with concomitant decrease in the number of S and G2/M phase cells, thus confirming G1 cell cycle arrest nature of the compound.
