The phrase "activity is restricted to" is correct and usable in written English.
It can be used to indicate that a certain activity is limited to specific individuals, groups, or conditions.
Example: "Access to the laboratory is restricted to authorized personnel only."
Alternatives: "activity is limited to" or "activity is confined to".
With this information it can be concluded that the region of the activity is restricted to the first 3 rows.
The live-cell protease activity is restricted to intact viable cells and is measured using a fluorogenic, cell-permeant, peptide substrate (glycyl-phenylalanyl-aminofluorocoumarin; GF-AFC).
As evidenced by subnivean infilled tunnels, winter activity is restricted to the upslope (and hence upwind) meadow edges, which correspond to high snow cover and warm (>~0 °C) shallow subsurface soil temperatures.
Present day glacial activity is restricted to the highest part of the area, above 5500 m a.s.l., mainly in the Cerro El Potro (5879 m) where a permanent ice field exists, as well as small mountain glaciers.
Furthermore, subcellular fractionation indicated that, while HPPD activity is restricted to the cytosol, TAT activity is detected in both cytosolic and plastidic fractions of Arabidopsis leaf tissue, suggesting that an unknown aminotransferase(s) having TAT activity is also present in the plastids.
Most activity is restricted to the night-time.
As enzymes are proteins, they contain many ionizable groups; hence, the catalytic activity is restrict to a small level of pH.
No rearrangements were observed when endonuclease activity was restricted to on-target β-globin cleavage.
Bone surface analyses indicate that hominids had primary access to fully fleshed carcasses, and that carnivore activity was restricted to post-depositional ravaging.
As shown in Figure 2C, GUS activity was restricted to the vascular tissues around the wounded area, but not in the mesophyll cells, guard cells, epidermal cells and vascular tissues in the BLB and wounded areas.
By this time, all the convection activity was restricted to the northeast quadrant of the system.
