The phrase "activate a call" is correct and usable in written English.
It can be used in contexts related to telecommunications or technology, where initiating a phone call or a communication session is required.
Example: "To connect with the customer, please activate a call using the provided number."
Alternatives: "initiate a call" or "start a call".
While the substance in question, resveratrol, is thought to activate a protein called SIRT1, I know of no evidence that it "actually inhibits SIRT1".
Just shake an iPhone 3G S with the latest version of Yelp's iPhone App three times to activate a feature called "Monocle".
In particular, inside cells, viral RNA can bind to and activate a protein called RIG-I.
This can activate a system called the unfolded protein response, which increases the number of chaperone proteins so that the proteins can be refolded correctly.
TGF- β can activate a program called epithelial-to-mesenchymal transition (EMT) in epithelial cancers, such as breast, prostate and lung cancer, leading to enhanced migration and infiltration capacities of these cells, being a more common feature of mesenchymal cells.
Zhang et al. now show that when any of a wide range of different signaling molecules bind to the GPCRs, the receptors activate a protein called ZBTB16 that leads to the degradation of Atg14L to inhibit autophagy.
When abscisic acid is present, the guard cells are sensitive to changes in their internal concentration of calcium ions so that calcium ions can activate a protein called SLAC1.
The new drugs are called sirtuin activators, meaning that they activate an enzyme called sirtuin.
For example, a feature called Zoom Ring allows the user to activate an in-call photo sharing feature by twisting the zoom ring on the device and then capturing and sending an image to the caller via MMS — all without having to suspend the call.
In response, cells activate an enzyme called poly(ADP-ribose) polymerase (PARP) to repair DNA damage.
