The phrase "an initial reaction" is correct and usable in written English.
It can be used when discussing someone's first response or feeling about a situation, event, or piece of information.
Example: "After hearing the news, my initial reaction was one of shock and disbelief."
Alternatives: "a first response" or "an immediate reaction".
To make the best use of the kinetic specificity of toehold domain for circuit reaction initiation, we developed a mathematical model and proposed an initial reaction rate detection mode to quantitatively differentiate the single-base mismatch.
The White House did not have an initial reaction.
In an initial reaction Tuesday, critics said their concerns have still not been answered.
In an initial reaction, BP said the complaint at this stage represented what were only the government's allegations.
McPherson relayed an initial reaction from Fallon, who spoke by telephone with his solicitor shortly after the verdict.
In an initial reaction in Brussels on Wednesday evening, European leaders said the ratification process should continue.
The Guardian approached a small number of firms for an initial reaction to the survey but was not offered an on-the-record response.
Though born in Japan, 52-year-old Uchida grew up and trained in Vienna; and, after an initial reaction against the city's stuffiness and traditionalism, she has made its music, especially Mozart and Schubert, the core of her repertoire.
In an initial reaction, Iran also appeared to reject new negotiations and indicated that it might even stick to the original agreement, which curtails significant aspects of its nuclear program.
The permeabilized cells were evaluated for the enantioselective hydrolysis of mandelonitrile, which showed an initial reaction rate of about 2-fold that of the cells without permeabilization.
Comparing the agitation systems, MCI-Lecitase presented an initial reaction rate more than 2-times higher in the ultrasound-assisted reaction than under traditional mechanical stirring.
