The phrase "a key constituent" is correct and usable in written English.
It can be used to refer to an essential part or element of a larger whole, often in contexts such as discussions about components of a system, organization, or concept.
Example: "Sustainability is a key constituent of our business strategy, guiding our decisions and practices."
Alternatives: "an essential component" or "a crucial element".
The capping effect on the country's mining sector – comprising a key constituent of the FTSE – has kept the UK tied to a tight 20-point range, unable to make any real gains through 6720.
For whites, the development has been more recent, and it has occurred at the same time as the emergence of anti-abortion sentiment as a key constituent of conservative political identity.
What this means is that identifying oneself with this secret is a key constituent of the very identity of a Christian priest: if a priest seriously (not just rhetorically) denounces these scandals, he thereby excludes himself from the ecclesiastic community, he is no longer "one of us".
GN per panicle, as a key constituent of rice yield, has been studied extensively.
Importantly, galactofuranose is a key constituent of major cell envelope polysaccharides in pathogenic mycobacteria.
Ironically, the DMK party, a key constituent of India's federal coalition, supported the protest - but the AIADMK party, which is in power in Tamil Nadu, did not.
V2O5 is an attractive key constituent for such a membrane because of its reversible red/ox behavior (V2O5/V2O3) and related textural variations able to regulate membrane permeance.
Alethea is a novel proprietary technology composed of three key constituent compounds; the hitherto unexplored compound potassium dihydrojasmonate, an analogue of jasmonic acid; sodium benzoate, a carboxylic acid precursor to salicylic acid, and the α-amino acid L-arginine.
One of them is Jakob Kellenberger, head of the International Committee of the Red Cross, who argued that the fighting in Homs and Idlib has been intense enough for long enough now that it matches the criteria defining a non-international armed conflict (another key constituent of that is the level of organisation shown by the Free Syrian Army).
For high-temperature application beyond the range of Ni-base superalloys, Mo Si B alloys with composition that yield the ternary intermetallic, Mo5SiB2, T2, phase as a key microstructure constituent, offer an attractive property balance of high-melting temperature, oxidation resistance, and useful high-temperature mechanical properties.
Phosphatidylinositol is an important lipid, both as a key membrane constituent and as a participant in essential signaling processes in all plants and animals.
