The phrase "are activated only during" is correct and usable in written English.
It can be used to specify that something occurs exclusively within certain time frames or conditions.
Example: "The safety features of the vehicle are activated only during a collision to ensure maximum protection."
Alternatives: "are triggered solely during" or "activate exclusively during".
Sithe, the developer of the Sentry Station, decided in March to scale back its proposal from an 827-megawatt plant to a 510-watt "peaking unit" that would be activated only during periods of extreme demand.
COX-1 is thought to help supply prostaglandins that maintain the stomach lining and salt balance in the kidneys; COX-2 is activated only during injuries and infections.
NtrC, a global regulator, activates the transcription of many genes for the uptake and catabolism of various nitrogen sources and should be activated only during nitrogen limitation (Chubukov et al. 2014).
Costimulation is critical for the specificity of the immune response because it allows T cells to be activated only during acute infection.
During the active phase, EMG activity was significantly higher for the ECR (which had to move the hand during most of the extension phase against gravity) than for the FCR (which was activated only during the beginning of the flexion phase as anti-gravitational muscle) (muscle × condition × phase interaction F 3,33) = 38.512, p<0.00001).
In the left temporal lobe, the mSTS was activated only during categorization of P sounds, whereas categorization of NP sounds engaged the pSTS.
This led the authors to postulate that the oxidative part of the pathway is predominantly active during the early stage of the intraerythrocytic replication cycle, whereas the non-oxidative part is activated only during the later stages [ 18].
Importantly, majority of P. falciparum genes are activated only once during the infected RBC cycle attesting the importance of stringent gene regulation in stage-specific manner [ 11, 12].
According to this design, each antenna is activated only once during each block, making differential operation possible so long as the wireless channel remains unchanged over two successive HR-DSM blocks.
