The phrase "and only upon" is correct and usable in written English.
It can be used to indicate that something will happen exclusively under certain conditions or circumstances.
Example: "The contract will be enforced and only upon the completion of all required payments."
Alternatives: "exclusively when" or "solely if".
They are, as yet, on probation, and only upon gaining the rights of full citizenship will the young males be expected to shoulder its duties.
Acetyl-CoA synthetase 2 (AceCS2) is acetylated in its active site at K642, and only upon deacetylation by SIRT3 does AceCS2 become active30.
His first language was English, and only upon entering politics did he acquire a command of Chinese as well as Malay and Tamil.
Participants' initial descriptions of prototypes were less sophisticated than how they later described using them, and only upon prompted reflection did participants recognize more specific benefits of using prototypes.
But Michael seized power, declaring himself king; and only upon abdicating the Brazilian empire (1831) was Peter able to proceed to Europe, occupy the island of Terceira in the Azores, and launch an expedition to conquer the mainland in Maria's name.
In France the Constitutional Council can set aside unconstitutional statutes only before they have been promulgated and only upon petition by either the president of the republic, the prime minister, the chairman of either of the two legislative assemblies, or a parliamentary minority that includes at least 60 deputies or senators.
This began the extraordinary process by which the territories and subsequently the nations of East Africa were blocked out first upon the maps far away in Europe and only later upon the ground in East Africa itself.
During germ cell specification in the mouse, nascent germ cells begin to express Oct3/4, Nanog, and Sox2, and express c-Myc and Klf4 only upon conversion to embryonic germ (EG) cells [40], [41].
Dihydrorhodamine 123 is a fluorophore that is localized to mitochondria and fluoresces only upon oxidation and as such can be used to make comparative measures of the rate of ROS production.
The Bt proteins are highly specific and only lethal upon ingestion, limiting the scope of toxicity to target insects.
Why not be truly green and replace those plastic, nonrecyclable, everlasting straws with paper ones and only offer upon request?
