1 Wash off with lukewarm water once it dries down. 2  If this sticks to your skin, take a clean cloth and wet it with warm water. 3  Rub your face gently with this cloth to remove the oats scrub from your face. 4  Repeat 2 times a week to get rid of black spots on your face.
Please help improve the article with a good introductory style. (October 2009) (Learn how and when to remove this template message) A molecular probe is a group of atoms or molecules used in molecular biology or chemistry to study the properties of other molecules or structures.
In chemistry, a substrate is typically the chemical species being observed in a chemical reaction, which is organic in nature and reacts with a reagent to generate a product. In synthetic and organic chemistry, the substrate is the chemical of interest that is being modified. In biochemistry, an enzyme substrate is the material upon which an enzyme acts. When referring to Le Chatelier's principle, the substrate is the reagent whose concentration is changed.