The phrase "a parallel decrease in" is correct and usable in written English.
It can be used when discussing two or more variables that are decreasing at the same time or in a similar manner.
Example: "The study found a parallel decrease in both temperature and pressure during the experiment."
Alternatives: "a simultaneous decline in" or "a concurrent reduction in".
In the first case one would expect a parallel decrease in NADH signal while in the second one would expect an increase in NADH.
Besides, a parallel decrease in intensities and slight blue shift of the bands located at 663 nm could also be observed.
Comparing the occurrence and the nature of the three subnetwork typologies, we verify in the second period an increase in the type A (open science) subnetwork and a parallel decrease in the type C (disconnected subnetworks).
The incoming nociceptive impulses converging on the trigeminal nucleus caudalis result in pain summation (wind-up), a decrease in activation threshold (CS), a parallel decrease in headache attack threshold and, finally, headache chronification [25].
There was a significant increase in the percentage of apoptotic cells in the rat AF cells cultured on soft and intermediate substrates relative to those on plastic surface, with a parallel decrease in the area of cell spreading and nucleus.
A parallel decrease in the medium pH within 24 hours was noted (7.7 to 4.77 and 5.8, respectively).
Moreover, in the hypertrophic zone, where Col2a1 transcription is normally down regulated, we saw a parallel decrease in Flag-Dlx5 transcript abundance (compare Fig. 2G,I).
In cause-effect experiments, we and others noticed a parallel decrease in NF-Y binding, H3K4me3, H3K79me2 and transcription using a dominant negative NF-YA mutant [22] [24].
Increasing the level of cytokines characteristic of Th2 cells and a parallel decrease in the amount of Th1-type cytokines, ameliorate the signs and symptoms of the disease [35].
C-fibre responses in eight fascicles had a Type A profile indicating that during stimulation at 2 Hz a monotonic slowing of latency and a parallel decrease in excitability index were observed (Figure 4A & 5A).
Contrary to our expectation, the lack of an increase in p53 in PBMC of MS patients when compared to HC in the presence of TSA, was not associated with a parallel decrease in the transcription of p53 upregulated apoptotic genes.
