The phrase "at which particular" is correct and usable in written English.
It can be used when specifying a certain point in time, place, or context that is being referred to.
Example: "There are several factors at which particular moments in history that influenced the outcome of the war."
Alternatives: "at which specific" or "at which exact".
The estrogen-receptor complexes enter the cell nucleus, where they modulate protein synthesis by influencing the rate at which particular genes are transcribed.
When choosing among plausible interpretive options, we should always choose the one that makes the most sense of the entire Constitution, regardless of the date at which particular provisions were enacted.
They must then be approved by the board in a public session, and ultimately by both governors, who traditionally signal approval or disapproval by signing or not signing the minutes of board meetings at which particular actions are taken.
Middlebury College, private, coeducational institution of higher learning in Middlebury, Vt., U.S. It is a small liberal arts college at which particular emphasis is given to the study of modern languages.
I have often thought that there must be an uncanny valley of politics, a point at which particular politicians rouse our discomfort because there's something about them that people connect with, but there's something else about them — intangible, unbelievable and not relatable — that produces a sense of unease.
But when geo-information supports surveillance of human activities, there is a point at which particular interests are going to be affected.
That means that an observer can't tell that a Tor user has even visited the site at all, let alone which particular Tor user.
Permeability is measured as the rate at which a particular substance in solution crosses the membrane.
(A threshold is the lowest point at which a particular stimulus will cause a response in an organism).
There is no bright line at which a particular piece of statistical evidence goes from being meaningful to meaningless.
No longer do consumers want to search the Web like the index of a book — finding links at which a particular keyword appears.
