Webster Dictionary(0.00 / 0 votes)Rate this definition: Melanin(noun) a black pigment found in the pigment-bearing cells of the skin (particularly in the skin of the negro), in the epithelial cells of the external layer of the retina (then called fuscin), in the outer layer of the choroid, and elsewhere. It is supposed to be derived from the decomposition of hemoglobin.
How to prepare your insulin dose if you are using two types of insulin: 1  When you mix regular insulin with another type of insulin, always draw the regular insulin into the syringe first. When you mix two types of insulins other than regular insulin, it does not matter in what order you draw them into the syringe.
The next step is to swab the rubber stoppers with alcohol. The regular insulin should be drawn first; the shorter-acting insulin should always be drawn first. The NPH insulin should be drawn next, being careful not to inject any short-acting insulin into the bottle. The skin of the injection site should be prepared with alcohol, and the insulin injected at a 90-degree angle.