The phrase "a certain compound" is correct and usable in written English.
It can be used when referring to a specific compound that is not named or when the speaker wants to indicate that there are many compounds, but they are focusing on one in particular.
Example: "In the experiment, we observed the effects of a certain compound on plant growth."
Alternatives: "a specific compound" or "one particular compound".
Generally such membranes have to be developed specifically for a certain compound in a suited solvent.
The atoms of a certain element are perfectly alike in weight, figure, etc.; and the same point applies to the atoms of a certain compound.
Throughout the fingerprinting process the information, which bonds a fingerprint feature represents in a certain compound, is stored.
Thus, we developed new tools for applicability domains, offering users information to assess whether a prediction is reliable for a certain compound.
However, knowing the exact value is not really important for many applications; it is rather important to know whether a certain compound will be insoluble under the used test-conditions and should thus be excluded from the experiment.
Hypothetically, we might imagine a model which erroneously predicts certain compounds to be safe, because it was designed to do that (in order to allow the use of a certain compound on the market).
In one problem set, several students argued that there should be zero pollution of a certain toxic compound, but pointed out that this was because the marginal cost of even a little of this compound was so high that it was worth cleaning up.
There are a number of recipes that survive for certain compound incenses, particularly one that hailed from Egypt called kyphi.
The researchers painstakingly generated a strain of laboratory mice unable to make either Arx or DNMT1 in pancreatic alpha cells when the animals were administered a certain chemical compound in their drinking water.
George W. Bush was obsessed with Western style as well, favoring cowboy boots, belt buckles and hats whenever possible, and steering clear of anything that suggested familiarity with a certain Kennebunkport compound.
Hence, in a certain degree, compound 8a might have cytotoxicity selectively towards Hela.
