The phrase "ascertained not" is not commonly used in modern written English, but it is grammatically correct.
It can be used in formal or literary contexts to indicate that something has not been determined or confirmed.
Example: "The results of the experiment were ascertained not to be reliable after further analysis."
Alternatives: "determined not" or "found not".
** Her value, as a virgin, is ascertained not by the young groom on the wedding night but, according to archaic folk custom, by the probing finger of a tribal crone: Eberstadt's partially renegade Gypsy friend Linda explains, "For Gypsies, it's a nasty old woman who is paid to penetrate the girl, like a gynecologist but with dirty hands, in front of all the husband's family.
Her value, as a virgin, is ascertained not by the young groom on the wedding night but, according to archaic folk custom, by the probing finger of a tribal crone: Eberstadt's partially renegade Gypsy friend Linda explains, "For Gypsies, it's a nasty old woman who is paid to penetrate the girl, like a gynecologist but with dirty hands, in front of all the husband's family.
However, a better understanding of the biological effects of these molecules must be ascertained, not least to identify any undesired secondary effects, such as tumorigenesis.
Females in reproductive age were ascertained not to be pregnant and informed to use effective contraceptive methods, if applicable.
Second, it should be remembered that this is an observational study and that only the associations between target and outcome can be ascertained, not cause and effect.
Subsequent harmonic balance analyses ascertain not only these two sustained oscillations, but also two other unstable limit cycles.
Practical reason, according to the vision, can ascertain not merely the means to achieve one's ends, but also the very telos or end for human beings.
What accounts for the disjuncture is difficult to ascertain, not because of the design of the framework but, rather, the relatively small sample size has not allowed for certainty in inferences.
Outcomes on learning are more difficult to ascertain, not least because measurement methods are still poor.
It is therefore important in any survival study to ascertain not only the extent of loss to follow-up, but also its independence of the probability of death.
Cause of death was not ascertained and could not be retrieved because the data were anonymized.
