"decreased effect" is correct and usable in written English.
You can use it when you want to describe a decrease in the strength or power of something. For example, "The increased use of pesticides had a decreased effect on the infestation of insects."
Lower doses could result in a decreased effect but might still be effective in subclinical disease.
Two new features specific to recombination in heterozygous regions are also revealed: an effective increase in crossover interference and a decreased effect of a fancm mutation, which normally increases crossovers that do not exhibit interference.
Worse diarrhoea at baseline was associated with decreased effect of ondansetron (every 1 point baseline average stool form increase reduced effectiveness by 0.4 points, 95% CI 0.00 to 0.8, p=0.032).
Changes in signal transduction involved in the process of fibrogenesis, as SMAD, MAPK, Akt and GSK, pointed to the decreased effect of TGFβ1, and this was corroborated by the decreased mRNA expression of TIEG and the growth factor itself.
The content of rubisco was improved by SA only in plants treated with 50 mM NaCl, and the activity of rubisco was increased by SA resulting in the decreased effect of NaCl, but only in 50 mM NaCl treated plants.
It is possible that the observed decreased effect on the H-5 chemical shift might be a consequence of a charge distribution on the oxygen nitro atoms.
Delayed administration of nicotinamide resulted in decreased effects.
However, decorin-null tendons exhibited significantly decreased effects of aging compared to the other genotypes.
In the cerebral cortex, dopamine turnover was increased, and serotonin turnover decreased, effects opposite in direction to those seen in young mice.
The hearing aids she wore grew stronger, but with decreasing effect.
That decreasing effect increases with increasing aging years.
