The phrase "a certain reaction" is correct and usable in written English.
It can be used when referring to a specific but unspecified response or behavior in various contexts, such as scientific discussions or emotional responses.
Example: "After the experiment, we observed a certain reaction that was unexpected and required further investigation."
Alternatives: "a specific response" or "a particular reaction."
Solution samples were then stored at 5 °C for a certain reaction time.
And the other is the typology of the circus, which we understand to be a series of rather fantastic performances that edge on the grotesque and evoke a certain reaction in the public.
The activity of the electrode towards a certain reaction is given by both the available wetted surface area and the electron transfer constant k0.
Recent developments of theoretical methods based on density functional theory have enabled computational screening of catalysts, to achieve fundamental understanding of which catalyst is optimal for a certain reaction.
He only gets a C- for this effort, however, since as we all know, the trick here is not to apologise at all but to say you're sorry, playing on the ambiguity between being sorry for doing something wrong and sorry that something you said or did provoked a certain reaction.
During the initial polymerization period, the mixture remained homogeneous; at a certain reaction extent a thermodynamically stable rubber-rich phase with critical particle size rc or larger grew spontaneously.
The moving parts are connected to a network of channels that send liquid fuel (a hydrogen peroxide solution) to mix with a platinum-based catalyst in certain reaction chambers.
From the above-mentioned GPC results, some unimodal distribution means only one active species worked in the CMRP with the catalyzation of a dinuclear cobalt complex under certain reaction conditions.
MFA revealed a rich intermediary metabolic data for the different conditions with an increase certain reactions in the TriCarboxylic Acid [TCA] cycle [v17 v20] for the recovery stage comparison [Figure 4A].
Instead of saying that it is correct, or fitting, to have a certain emotional reaction to a certain object, we can say that contemplation of that object requires that emotional reaction.
What galls Flaubert most is the inevitability, given an action, of a certain standard reaction.
