The phrase "a significant activity" is correct and usable in written English.
It can be used to describe an action or task that holds considerable importance or impact in a given context.
Example: "Participating in community service is a significant activity that fosters social responsibility among students."
Alternatives: "an important task" or "a meaningful endeavor".
These structures exhibited a significant activity but a very low platinum electrochemically active surface area (Pt-EASA) due to the grafted molecules on the platinum core nanoparticle surface.
However, the midpoint of the hERG1 activation is around −30 mV, so that it possesses a significant activity down to −40 mV, which is close to resting potential in some nonexcitable cells, including lymphocytes.
However, unfortunately, we could not detect a significant activity of the FoF1 due to low yields.
Additionally, market gardening is a significant activity in the region, as is the production of flowers and nursery plants.
Forestry is a significant activity and has helped to retain population in Scotland's rural areas.
The compressive strengths of mortars have shown a significant activity of TS with cement.
All derivatives exhibited a significant activity with minimum inhibitory concentrations (MICs) in the low micromolar range.
As compared with PdSn/C, the trimetallic catalysts show a significant activity enhancement for ethanol and formic acid electro-oxidation.
The practice of mediumship enjoyed a rebirth in the 1970s as a significant activity within the New Age movement, which looked to the coming of an idealistic culture in the 21st century.
Bimetallic PdxAuy/C catalysts had a significant activity for a selective hydrogenation of HMF toward DMF comparing to monometallic Pd/C and Au/C catalysts.
Maintenance of Pressure Safety Valves (PSVs) is a significant activity because they are usually in quite high number and are recertified regularly.
