The phrase "an additional reason is" is correct and usable in written English.
You can use it when introducing another point or justification in an argument or discussion.
Example: "While the initial findings are promising, an additional reason is the long-term sustainability of the project."
Alternatives: "another reason is" or "a further reason is".
An additional reason is the inertness of the electrode surface due to the CH2 groups in the negative and CO groups in the positive region.
An additional reason is that microarray data analysis has largely been treated in the past as a set of separate steps, with the majority of emphasis being placed on statistical analysis and visualization of the data.
An additional reason is the ISS attitude change (performed for the Shuttle docking) leading to decreasing of dose rates in two of Liulin-5 detectors because of the East West proton fluxes asymmetry in SAA.
An additional reason is that the Fluorotron Master may have measured residual fluorescein in the tear film.
An additional reason is that they also lacked insurance coverage to purchase more appropriate controller asthma medications [ 39].
An additional reason is that syntenic QTLs are difficult to identify and validate due to the limited number of orthologous markers commonly positioned among unrelated families or species.
This made the German government join the process of organizing research teams in that area; an additional reason was to make achievements of German scientists outmatch achievements of other nations.
And the f off-spinners don't turn.' I think an additional reason was that he found some difficulty in accepting the conventions of English cricket as it was then.
That additional reason is our critical association with a vast microbial partnership that is crucial to our immunological balance.
But there's an additional reason to be angry at the schools who don't even make an effort.
Additional reasons are presented elsewhere [30].
