However, this requirement of certainty is where verbal contracts invariable encounter difficulties when a dispute between the parties has arisen, since those terms are very difficult to ascertain.
Chief among them is that optical sectioning of the terminal end bud (TEB) and ductal epithelium allows the appreciation of abnormalities in structure that are very difficult to ascertain using either bright field imaging of the stained gland or the conventional approach of hematoxylin and eosin staining of fixed and paraffin-embedded sections.
"There is no objective test for backache so it's very difficult to ascertain its seriousness," explains Dr Levinson.
In any event, just from video images and photographs it is very difficult to ascertain exactly what the cause of such an incident would have been.
It is very difficult to ascertain when tattooing came about in human culture because there are few written records and scientists must instead look at the archaeological record.
The full death toll from the violence is very difficult to ascertain: medical staff are under instructions not to disclose information, and security forces routinely dispose of bodies secretly, local human rights officials and activists say.
Emile Schrijver, the current curator of the Bibliotheca Rosenthaliana — whose collection was successfully returned to Amsterdam, via Offenbach, after the war — said that it can be very difficult to ascertain the true history of a particular book.
It still remains unknown, and it will be very difficult to ascertain, whether many of the most prolific grunters intentionally grunt to interfere with their opponent's performance.
It had been very difficult to ascertain whether IMGs were adequately trained or prepared for U.S. residency programs [ 12].
However, with the uncertainty about the true source population for the Heligoland mice, this would be very difficult to ascertain.
In general it is very difficult to ascertain whether biomarker proteins are generated by the cancer itself or by secondary effects, such as immune response.
