The phrase "activity was down" is correct and usable in written English.
It can be used to describe a decrease in the level or amount of activity in a particular context, such as business, sports, or social events.
Example: "Due to the recent economic downturn, overall activity was down compared to last year."
Alternatives: "activity decreased" or "activity declined".
Residential construction fell 2.9percentt and nonresidential activity was down 4.3percentthethe biggest decline since January 1994.
In the first quarter of 2012, mergers and acquisition activity was down 34 percent worldwide to $481 billion.
Agricultural activity was down 6.7percentt quarter-on-quarter and 2.8percentt lower than a year earlier, according to the state statistics institute.
Manufacturing sentiment improved in Richmond, manufacturing activity increased (but at a slower pace) in Texas, and manufacturing activity was down in Chicago.
There was an 8.6 percent month-on-month reduction in exports, and construction activity was down 13 percent in April from March.
Activity was down to about $90 billion this year from 1999, when a record $120 billion in utility assets changed hands, but investment bankers like Robert Hoglund, an energy industry expert at Salomon Smith Barney, expect it to bounce back to about $100 billion next year.
We therefore hypothesized that UNG activity was down-regulated in RNAi/DUT1 plants.
At the same time OPG, an inhibitor for osteoclast differentiation and activity, was down-regulated in primary human osteoblasts.
Invasion of hepatic and colon carcinoma cells containing C2GnT1 shRNA was significantly reduced compared to control cells in Matrigel assays and C2GnT1 activity was down-regulated in the latter cells.
As expected, GDH-NADH (aminative) activity was down-regulated in B-deficient C. sinensis roots.
Luciferase assays demonstrated that both endogenous and TRAIL-induced NF-κB activity was down-regulated by AdIKKβKA expression.
