ammonium quaternary cations

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• Quaternary ammonium cation — Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR4+ with R being alkyl groups. Unlike the ammonium ion NH4+ itself and primary, secondary, or tertiary ammonium cations, the quaternary… …   Wikipedia

• Quaternary ammonium muscle relaxants — are quaternary ammonium salts used as drugs for muscle relaxation, most commonly in anasthesia. It is necessary to prevent spontaneous movement of muscle during surgical operations. Muscle relaxants inhibit neuron transmission to muscle by… …   Wikipedia

• Ammonium — This article is about the cation. For the ancient city, see Siwa Oasis. The NH4+ ion …   Wikipedia

• Onium compounds — are cations derived by the protonation of mononuclear parent hydrides of elements of the nitrogen group (Group 15), chalcogens (Group 16), or halogens (Group 17), and similar cations derived by the substitution of hydrogen atoms in the former by… …   Wikipedia

• Neuromuscular-blocking drug — Global view of a neuromuscular junction: 1. Axon 2. Motor end plate 3. Muscle fiber 4. Myofibril …   Wikipedia

• ion-exchange reaction — ▪ chemical reaction Introduction       any of a class of chemical reactions between two substances (each consisting of positively and negatively charged species called ions (ion)) that involves an exchange of one or more ionic components.… …   Universalium

• Amine — For other uses, see Amine (disambiguation). Primary amine Secondary amine Tertiary amine …   Wikipedia

• chemical compound — Introduction  any substance composed of identical molecules consisting of atoms (atom) of two or more chemical elements (chemical element).       All the matter in the universe is composed of the atoms of more than 100 different chemical elements …   Universalium

• protein — proteinaceous /proh tee nay sheuhs, tee i nay /, proteinic, proteinous, adj. /proh teen, tee in/, n. 1. Biochem. any of numerous, highly varied organic molecules constituting a large portion of the mass of every life form and necessary in the… …   Universalium

• Classification of surfactants — Surfactants are classified according to their chemical structure (head and tail) and their counter ion. Contents 1 Classification 1.1 According to the composition of their tail 1.2 According to the composition of their head …   Wikipedia

• Zwitterion — Two isomeric forms of an amino acid. The isomer on the right is a zwitterion …   Wikipedia