In science writing—as opposed to, say, literary criticism or cultural studies—a premium is placed on precise, clear language. Unambiguous communication of information is in fact the fundamental goal of science writing. One way to achieve this goal is to consistently use the most precise language possible: choose a precise word or phrase and use it consistently. Consider the following (simplified) sentences taken from the abstract, introduction, discussion, and conclusion of a chemistry paper:
We investigated the antiatherogenic properties of the compound.
We investigated the antiatherosclerotic properties of the compound.
We investigated the antiatherosclerosis activity of the compound.
We investigated the atherosclerosis-preventing activity of the compound.