Also in the following sentence you edited, I think the word "require" should be "requires". since the subject is "the efficacy" singular. PLease also clarify this as well.<br /><br />
<p>The efficacy of such strong oxidants as DMDO, however, decreases over time due to volatilization and decomposition, and thus <strong>require</strong> immediate use after preparation (Wallace et al., 2005).</p>