The phrase "activity can only be" is correct and usable in written English.
It can be used to indicate that a certain activity is restricted to a specific condition or context.
Example: "This type of activity can only be performed during the designated hours of operation."
Alternatives: "activity is limited to" or "activity may solely be".
MutH binds to hemi-methylated GATC sites but its latent endonuclease activity can only be activated through association with the MutL-MutS complex.
The mechanism by which these extracts exhibited their antitrypanosomal activity can only be speculated since the active ingredient(s) were not isolated.
"Such an activity can only be seen as an abject failure of the deployment, a gross abuse of their role and their position as a police officer and an individual and organisational failing.
HydA is nuclear-encoded by the hydA gene, and its transcription and activity can only be observed under anaerobic or sulfur-deprived conditions.
Full DR4 reporter activity can only be achieved upon overexpression of TRβ (data not shown).
Since the partial Nuc sequence has no signal peptide, its nuclease activity can only be detected outside of the host cells when it is fused to a polypeptide that is targeted for extracellular localization [15].
"If schools follow government-approved curriculums, some activities can only be done in a [bigger] group.
In the RCPSP-ROC, activities can only be executed in a single mode and, therefore, with one specific value for duration and resource consumptions.
Both work and leisure activities thus impose a schedule constraint on workers, meaning that these activities can only be performed at specific times or within a specified time frame.
However, graduate assistants do not lectures but rather they supervise tutorial, seminar presentations and practical., It also identifies that university teaching activities can only be conducted by staff with a master's and Ph.D. qualification for undergraduate programmes and staff with Ph.D. qualifications for postgraduate degree programmes (TCU 2014).
[However], these activities can only be enjoyed only on weekends or holidays and all of them require training and practice," he continues.
