The phrase "absence of a base" is correct and usable in written English.
It can be used in contexts discussing foundational elements, such as in scientific, mathematical, or philosophical discussions.
Example: "The experiment yielded inconclusive results due to the absence of a base for comparison."
Alternatives: "lack of a foundation" or "deficiency of a base".
Electronic absorption measurements in protophilic solvents (dmso and dmf) in the presence and absence of a base disclosed deprotonation of the thioamide (NH) proton.
Solvent free oxidation of benzyl alcohol was investigated in the absence of a base using Au catalysts prepared by sol immobilization on titania and carbon supports.
Solid 1 can heterogeneously catalyze the cross-coupling of arylboronic acids with imidazole in the absence of a base or additive to generate the corresponding coupling products in excellent yields in methanol at 50 °C, which can be recovered and recycled by a simple filtration and was used for six consecutive cycles with consistent activity.
If oximes have relatively low pKa values and are deprotonated in the absence of a base in the active site, can these oximes be more nucleophilic than the catalytic serine hydroxyl group to drive the reactivation to completion?
In the absence of a base, the phenol inefficiently stabilizes the developing positive charge on the cyclogenerated carbocation.
Catalysis by the iron-bound dioxygen is generally proposed for IDO in the absence of a base, and seems reasonable from modelling simulations.
And in the absence of a significant base of users, that argument is going to be hard to make.
It is necessary to provide explanations that are more detailed in the absence of a knowledge base.
There had been little to propel Ban's chances for the presidency in the absence of a political base and the lack of a clear message after his return from New York, Kim said.
We included this comparison group owing to the absence of a data base of population 'norms' for our community.
To this kernel, we added information about the presence or the absence of a uridine base at the first position of the sequence.
