Assay

An assay is a procedure for the determination of the amount of a particular constituent of a mixture.

DNA

\nAssays for studying interactions of protein with DNA include:\n*DNase footprinting assay\n*electron microscopy\n*filter binding

Coins

\nAn assayor is often assigned to each mint to determine and assure that all coins produced there have the correct content or purity of each metal in them. This is particularly important with gold coins, and with silver ones as well.