The phrase "a much higher activity" is correct and usable in written English.
It can be used when comparing levels of activity in different contexts, such as scientific research or performance metrics.
Example: "The new treatment resulted in a much higher activity of the enzyme compared to the control group."
Alternatives: "significantly greater activity" or "considerably increased activity".
Although both the CeO2 nanorods and the CeO2 nanowires predominantly expose the reactive {1 1 0} and {1 0 0} planes, the CeO2 nanowires favor to expose a large proportion of active planes on the surface, resulting in a much higher activity for CO oxidation than the nanorods.
It's a much higher activity level, playing the ball and having to play every play.
In clear difference to the grains, twins have a much higher activity which can be proved in cyclovoltamograms as well as with metal deposition.
They yielded a much higher activity than Pd supported on non-doped carbons used as blanks, thus suggesting a synergistic between the NDCs and Pd.
The Rh, Pd and Pt catalysts prepared from microemulsions were found to exhibit a much higher activity for the hydrogenation of carbon dioxide than those from impregnation.
The heterosystem shows a much higher activity than Bi2S3 alone where efficient H2-photoevolution can be realized with concomitant oxidation of X2−.
However, a very much higher activity was obtained when the gels were incubated in the presence of both, Ca2+ and Mg2+, showing an increased activity in CPT-treated cells.
One day, when they decided to reinvestigate a cell homogenate after keeping it for a day or two in a fridge, they found much higher activity of this enzyme compared to the initial measurement.
The Cu/CeO2 nanotubes exhibit much higher activity and lower activation energy than Cu/CNF.
While the three Pdc isoenzymes exhibit a low activity with KIV, their much higher activity and affinity for pyruvate [ 13] renders them unsuitable for high-efficiency production of isobutanol and other fusel alcohols.
Most centres use a fixed dose of 7.4 GBq (200 mCi), but some use (much) higher activity doses.
