This made it impossible to yield meaningful results if patients were stratified according to age, preoperative scores, etc.
It is almost impossible to yield food of animal origin which is completely free from traces of drugs or chemicals (Campbell 1978).
For their part, Republicans blame Mr. Brown for the breakdown, saying that his loyalty to unions made it impossible for him to yield in some key areas, like restrictions on public employee pensions and a permanent cap on state spending.
These pseudogenes are very similar in nucleotide sequence to the corresponding functional genes, but they include terminating codons and other mutations that make it impossible for them to yield functional hemoglobins.
Experts claimed the measurements were fake and suggested it was impossible to produce a yield so large.
The impossible subject has yielded a feast of moviemaking.
Here in the heart of the nation's largest concentration of Arab-Americans, where those interviewed have been allowed to bring lawyers or other guests and to tape-record the conversations, many who have participated say that the meetings have been friendly and professional, but that it seems impossible for the pro-forma questioning to yield useful information.
But to expect an inference from the observed to the unobserved to yield certainty is to expect the impossible.
Teasing out the precise contribution of a particular efficiency improvement isn't just difficult, however; it may be impossible, because the endlessly ramifying network of interconnections is too complex to yield readily to empirical, mathematics-based analysis.
This allows multi-cellular organisms to switch fates and states to yield diversity, such as for development or stress, which, otherwise, may be impossible from a purely deterministic system.
