The phrase "appears necessary for" is correct and usable in written English.
You can use it when you want to express that something looks like it needs to be done or is required in order to fulfill a certain action or goal. Example: Additional research appears necessary for a deeper understanding of the problem.
For this, a risk analysis appears necessary for each project.
Thus, coordinate activity of both the p38 and BMK1 pathways appears necessary for optimal transcription of c-jun and, pari pasu, VSMC proliferation.
AQP0 appears necessary for cell-to-cell adhesion and thereby to minimize light scattering since in the AQP0−/− and TgAQP1+/+/AQP0−/− lenses, fiber cell disorganization was evident.
Sleep appears necessary for our nervous systems to work properly, says the US National Institute of Neurological Disorders and Stroke NINDSS).
Even so, substantial further development of higher-brightness electron sources, preferably with the use of MeV energies, appears necessary for three-dimensional diffractive imaging of beam-sensitive specimens with close to atomic resolution and sub-nanosecond time resolution.
Hand-sorting appears necessary for sampling the total earthworm community in particular for endogeic species, but when only species richness is of interest, the application of a chemical expellant can be a time-efficient method.
The International Association of Machinists, which represents 36,000 mechanics and other ground workers, said that labor cost cuts did not appear necessary for United's financial well-being.
Dr. Diener said that although strong social bonds appeared necessary for happiness -- every very happy student had them -- a rich social life was not in itself sufficient to guarantee happiness.
Far more than appeared necessary for an app simply targeting AKI.
Keeping shade trees appeared necessary for wind protection of coffee on the slopes of the Kilimanjaro, also in northern Tanzania.
Somewhat surprisingly, the physical link between GPIb/V/IX and the membrane skeleton does not appear necessary for GPIb/V/IX-induced cytoskeletal reorganization.
