The phrase "actively prevents" is correct and usable in written English.
It can be used when describing an action that is taken to stop something from happening in a deliberate and ongoing manner.
Example: "The new policy actively prevents any form of discrimination in the workplace."
Alternatives: "effectively stops" or "proactively hinders".
"Our work in this area has identified a natural brake – a protein called SIK1 – that is activated by light and actively prevents the clock shifting.
Where drugs are concerned, however, it actively prevents people from making a reasonable assessment of the risks they are taking.
Texting someone when I'm feeling depressed just doesn't have the same impact as a real-life conversation, and shutting myself inside a wall entirely made of snarky tweets actively prevents me from seeking genuine help.
Indeed, it's arguable that tilting at this papery windmill of artistic superiority actively prevents a great many people from confronting the very real economic inequality and political disenfranchisement they're subject to, exactly as being compelled to chant the mantra "choice" drowns out the harsh background Muzak telling them they have none.
But now we have a system that actively prevents people from getting help.
According to the report, it's important that a workplace both promotes healthy lifestyles and actively prevents illness and injury by limiting employees' risk of exposure to things like stress, accidents and sexual harassment.
We found that both Wnt3a and BMP4 reduced the number of cells co-labelled with Olig2 in the nucleus, indicating that both factors were actively preventing the nuclear activity and differentiating capabilities of Olig2, possibly via ID2 induction.
Prevention of a defined motion at the site of the regional link was rated as a pass (able to demonstrate good active control) or fail (unable to actively prevent uncontrolled movement).
As I pointed out some 20 years ago, the problem is not that condom-based prevention work has failed but that prevention work itself has so often been actively prevented, not least in the United States.
The necessity to actively prevent the most posterior genes from premature activation is supported by their basal transcriptional activity in ES cells, where Hox clusters are less discrete than in subsequent negative tissues such as fetal brain cells.
Successive Australian governments have actively prevented journalists from getting access to detention centres, here or offshore.
