The part of the sentence 'a concomitant decrease in the' is correct and usable in written English.
You can use it when you want to describe an accompanying decrease in something. For example, "The increased regulation had a concomitant decrease in investment opportunities."
An increase in oxygen and cerulenin levels resulted in a concomitant decrease in the DHA to docosapentaenoic acid (DPA) (DHA/DPA) ratio in BL10 oil.
A concomitant decrease in the levels of toxic intermediate, 3-HPA, was observed, with the specific productivity levels being 25% lesser than that of the native strain.
Detachment of the radial from the calcified zone resulted in swelling of the cartilage plug in physiological saline and a concomitant decrease in the quadrupolar splitting.
Vibrational spectroscopy indicates interaction between Na+ and the EA carbonyl groups, with a concomitant decrease in the sulfonyl interaction, facilitating Na+ motion, as well as lowering Tg.
Upon the addition of catechin-AuNPs, the appearance of 4-AP was monitored by the emergence of a peak at 300 nm with a concomitant decrease in the intensity of the peak at 400 nm (Figure 7A).
In agreement with this structural observation, substitution of the R3 position of the aromatic ring with longer aliphatic groups has been shown to increase the inhibitory effect with a concomitant decrease in the MIC value from previous study.
Decrease in GSH content and increase from the level of lipid peroxidation due to Fl toxicity simultaneously decreased the activities of GST and GPx with a concomitant decrease in the activity of GSH-regenerating enzyme, glutathione reductase (GR).
In Yugoslavia, an economic and cultural policy of centralization as well as an accelerated industrialization starting in the 1960's led to an exodus from the countryside to towns and a concomitant decrease in the agricultural sector (Hadživuković 1989).
The proportion of bole biomass in the CRM and CRM+DRF increased slightly with increasing decay class, which resulted in a concomitant decrease in the biomass of other tree components.
Importantly, transduction promoted a neuronal phenotype characterized by neurofilament M (NFM) with a concomitant decrease in the embryonic marker, nestin, without significant change in glial fibrillary acidic protein (GFAP).
Furthermore, the mRNA expression patterns of osteoprotegerin, osterix, runx2, and osteopontin were increased by 3.6, 2.3, 1.8, and 1.7-fold, respectively, with a concomitant decrease in the mRNA expression levels of adipocyte marker genes.
