The phrase "at a trace" is not correct and does not convey a clear meaning in written English.
It may be intended to refer to something related to a trace, but without additional context, it is unclear when it could be used.
Example: "The data showed a significant anomaly at a trace, indicating a potential error in the readings."
Alternatives: "at a hint" or "at a mark".
One is present at a trace level and is preferentially adsorbed.
AOB produce soluble microbial products (SMPs) and nitrous oxides (N2O), respectively, as aqueous and gaseous products at a trace level in their metabolism and decay processes.
Pseudopolarography can be used to distinguish labile metal complexes from the inert complex species and to estimate the distribution of metal ions at a trace level.
The 3D cubic Fd3m supermicrosensors also exhibited easy accessibility of target ions, such as ion transports; and high affinity binding events, particularly at a trace level of target ions.
The key advantage of 3D cubic Fd3m supermicropores is the easy access to target ions, such as ion transports, and high affinity responses of the receptor-metal analyte binding events, resulting in the easy generation and transduction of optical color signals even at a trace level of Cu II) target ions.
The lowest possible detectable amounts (μg/spot) of SC, SDC and STC on 5%(aq) 1-methylimidazolium chloride impregnated silica gel (S4) plates developed with M2 (2-methyltetrahydrofuran) were 0.7, 0.4 and 3.5, respectively, showing reasonably good sensitivity of the proposed method for the identification of surfactants at a trace level with preliminary separation from their mixture.
Lithe and shy, with short gray hair, he still has, at sixty-two, a trace of the ropy ocean sylph you see in photographs from his early days aboard Hokule'a.
I had found a place where at least a trace of what I lost on that journey from Columbia to Ito-land, the dream I had believed in, the closeness I once knew, could be found.
Human genome biology is extremely complex and much of the genome shows at least a trace of biochemical activity.
We want a planet with seasons, at least a trace of oxygen in the atmosphere, and abundant underground water.
