"upon perception" is correct and usable in written English.
It is typically used to indicate the moment when something is seen, sensed, or understood. For example, "Upon perception of the severity of the situation, they knew they needed to act quickly."
Upon perception of the extracellular signal by the periplasmic or outer membrane proteins, degradation of the anti-sigma factor induces releasing of the sigma factor, which can promote the transcription of a specific set of target genes.
This particular study will focus upon the installation of temporary activities into the public realm and the impact that these can have upon perception, identity and activity within public spaces.
We speculate that HSI2-mediated transcriptional repression is naturally relieved upon perception of limiting water conditions.
The structure of message cues can impact upon perception of risk.
Upon perception of gibberellin, the DELLA proteins are degraded, relieving repression on cell responses to gibberellin [ 7– 9].
Nodule formation is initiated upon perception of lipo-chitooligosaccharide (LCO) signals excreted by compatible rhizobium bacteria [ 7].
They also look at the ways in which social and economic forces impact upon perceptions and responses.
12 Monkeys studies the subjective nature of memories and their effect upon perceptions of reality.
Clearly, the relentless media attacks - and occasional overt violence - directed toward immigrants has taken a toll, even upon perceptions of Hispanics who are legal residents.
"The practice of denying credentials based upon perceptions of bias can all too easily lead to viewpoint-based decisions made to protect the credentialing organization itself rather than the public.
Study 3 showed that Mormons and non-Mormons significantly differed both in perceived health and perceived spirituality but that perceptions of spirituality were based upon perceptions of health.
