The reaction results in (the) oxidation of these compounds.
These goals can be achieved through (the) creation of large-scale databases.
(The) addition of fruit flavor enhances the popularity of yogurt in general.
My understanding is that the definite articles are optional in all the three sentences above and they mean almost the same thing with out without a "the." But I am inclined to think that the versions with a "the" sound more formal than ones without one.
Would you agree?
What other differences are there between the versions with and without a "the"?