The phrase "an isolated observation" is correct and usable in written English.
You can use it when referring to a single instance or remark that stands alone without context or additional examples.
Example: "The researcher noted an isolated observation during the experiment that warranted further investigation."
Alternatives: "a singular observation" or "a lone observation".
This is not an isolated observation.
The yellow discoloration of semen was an unexpected finding and appears to be an isolated observation attributable to one or more colored metabolites.
From a chemical point of view, some foam-positive compounds have been isolated and characterized whereas foam-negative ones have been suggested but not yet sufficiently investigated, although the negative influence of lipids on foamability seems to be more than an isolated observation.
It opened at the Paramount last night.As an isolated observation of a middle-aged man's pathetic try to get a little love from a sensitive young woman of a sort that he has evidently never known, this major component of the picture has considerable warmth and sympathy.
The point here is that the 'falsification/corroboration' disjunction offered by Popper is far too logically neat: non-corroboration is not necessarily falsification, and falsification of a high-level scientific theory is never brought about by an isolated observation or set of observations.
Hence, an observation with one neighbour within 100 km distance received the weight 0.5, while an isolated observation was weighted as 1.
They then hurried past ominous looking, space-suited health workers, whose instructions were to lead away anyone with a fever for isolated observation.
United Nations officials said the kidnapping of the Ukrainians was discovered on a routine check that found the Serbs in control of the isolated observation post and the Ukrainians nowhere to be seen.
Yet this was also a great gift, since it turned seemingly isolated observations into figures in an equation, something to be solved.
To systematically evaluate whether these recent reports are isolated observations or reflect a changing trend in the etiology of childhood diarrhea hospitalizations, we reviewed studies of rotavirus detection among children hospitalized with diarrhea published from 2000 through 2004 and compared the data with those of the previous review of studies published from 1986 through 1999.
There have been isolated observations of walruses preying on seals up to the size of a 200 kg bearded seal.
