The phrase "activities shut down" is correct and usable in written English.
It can be used to describe a situation where various activities or operations have been halted or ceased.
Example: "Due to the severe weather conditions, all outdoor activities shut down for the day."
Alternatives: "activities suspended" or "activities halted".
Unfortunately, the newly built trust between Iran and the 5+1 powers is in danger of collapse because of the unreasonable insistence by hawkish politicians and pundits in the West who echo Tel Aviv's demands that Iran halt all enrichment activities and shut down the underground Fordo facility, even though the I.A.E.A. inspects it regularly.
Those activities were shut down last spring at the same time Obama proposed a major reorganization of federal science education programs.
Ceasing of state direct funding for most public institutions is inevitably going to affect all the extracurricular activities and shut down the few clubs that now remain free.
Swartz's activities ultimately shut down JSTOR's servers briefly, and eventually resulted in MIT's library being blocked by JSTOR for a few days.
A mine must eventually show activity or shut down and restore the land it used.
Just having a mindless activity to shut down my brain at the end of the day?
Over the last several days nearly all oil and gas production was halted, and over a third of refinery activity was shut down.
Alberta's energy regulator passed new guidelines after the January quakes, forcing industry to report seismic activity and shut down their operations for anything over 4.0 magnitude.
It is necessary that this reaction is very slow compared to the ubiquitination reactions so that the model output fits the experimental data when E1 activity is shut down (see section 4.4).
For example, with our original choice of parameters our model predicted that if E1 activity is shut down, then there is an almost immediate conversion of ubiquitin conjugates to monomeric ubiquitin.
