Crucially, in that gel were plenty of thioketals, compounds that fall apart when exposed to reactive, oxygen-containing molecules, plus just a sprinkle of titanium dioxide--an inert material that, when exposed to ultrasound, releases just those molecules.

至关重要的是，这种凝胶中含有大量的硫酮化合物，这种化合物接触到活性的含氧分子就会分解，外加少量二氧化钛--一种惰性物质，暴露在超声波下时，这些分子就会被释放。