Words similar to upon

Example sentences for: upon

How can you use “upon” in a sentence? Here are some example sentences to help you improve your vocabulary:

Treatment of lines A and B with T-RA induces a fraction of the cells to adopt an atypical elongated cell morphology, which to our knowledge has not been previously seen upon differentiation of F9 cells.
"The Prime Minister and the Foreign Secretary must now convince the President that his reputation, and NATO's future credibility, rests upon a willingness to use the tools at his disposal."
Fluorescence rather than radioactivity can detect the labeled ligand, which provides more information on the localization of the receptor upon SP activation.
The cells were passaged weekly upon reaching confluence.
Upon arrival from Europe, now more than two decades ago, I was taken aback by the level of violence in the American media.