Main article: Nicotinic acetylcholine receptors. The nAChRs are ligand-gated ion channels, and, like other members of the cys-loop ligand-gated ion channel superfamily, are composed of five protein subunits symmetrically arranged like staves around a barrel.
Acrylonitrile butadiene styrene, otherwise known as ABS plastic, is a lightweight material popularly used in children's toys. There are two types: one suited for extrusion molding and one for injection molding. LEGO blocks are made from ABS plastic because it is so light and durable. Continue Reading.
Flexible Polyurethane Foam Flammability. Flexible polyurethane foam (FPF) is an organic material and, like all organic materials, is flammable. Organic materials include a variety of common substances including wood, paper, cotton, wool, nylon, polyester, polyethylene, and polystyrene and other plastic materials. Polyurethane Foam Association members have provided their customers with educational materials about FPF flammability for more than 20 years.