Receptor: 1. In cell biology, a structure on the surface of a cell (or inside a cell) that selectively receives and binds a specific substance. There are many receptors.
The most common is EPNS (Electro Plated Nickel Silver) but many other symbols are used: 1  EPBM (Electro Plated Britannia Metal). 2  EPCA (Electro Plated Copper Alloy). 3  ESM (Electro Plated Silver Mounts).he most common is EPNS (Electro Plated Nickel Silver) but many other symbols are used: 1  EPBM (Electro Plated Britannia Metal). 2  EPCA (Electro Plated Copper Alloy). 3  ESM (Electro Plated Silver Mounts).
Electroplated nickel silver, or EPNS, is an alloy of nickel, copper, and zinc that's covered with a layer of pure silver in an electrochemical process. Nickel's resemblance to silver helps disguise any worn spots in the plating.lectroplated nickel silver, or EPNS, is an alloy of nickel, copper, and zinc that's covered with a layer of pure silver in an electrochemical process. Nickel's resemblance to silver helps disguise any worn spots in the plating.