The phrase "a trend of activity" is correct and usable in written English.
It can be used to describe a pattern or tendency in a particular type of behavior or action over time.
Example: "There has been a noticeable trend of activity in the local art scene, with more galleries opening and events being organized."
Alternatives: "a pattern of behavior" or "a tendency of actions".
But trading volume hit its lows for the year, continuing a trend of slow activity as unseasonably hot weather hit New York City and traders skipped out early.
All of the income gains, reported the Post, "effectively came in cities and suburbs, while none of them flowed to rural areas — continuing a trend of economic activity concentrating more and more in a few large metropolitan regions". In fact, non-metropolitan areas actually saw their incomes decline two percent over the last year.
However, there was still a trend of reduced activity (i.e., higher fluorescence) for the tissues previously incubated in MX, MK, HHCB, and ADBI.
The results also revealed a trend of increased activity on both substrates, as the intermodular linker length increased from no linkers at all to short 5-residue linkers, and from short to long linkers.
A similar trend of activity was also observed when Ti-KIT-6 (calcined, Si/Ti = 200, 100, and 50 ratios) was used.
A similar trend of activity was obtained against MMS-induced mutagenicity.
A similar trend of activity changes for the various mutants is also observed when the initial velocity for the deamination assay was performed (Supplementary Table S2).
The results of the National Cancer Institute's (NCI) 60 cell line screening assay show a distinct structure activity relationship (SAR), wherein a trend of the highest activity for molecules with one N-methylpyrrole peptide.
The HSE data found a trend of decreased physical activity with increasing age; yet, in this study, prostate survivors (the oldest subgroup) reported higher physical activity levels.
A trend of increased apoptotic activity for VSMC and 7721 cells was observed with increasing H2O2 concentration in solution (Fig. 4b).
