Arginine. Arginine, or L-arginine as it is called with its L-structure, is a semi-essential amino acid. Arginine is involved in many metabolic processes and important in the treatment of heart diseases and high blood pressure.
Layman's explanation: Nitric acid was first discovered in 1648 by a German chemist, Johann Rudolf. However, in 1901 Wilhelm Ostwald developed the Ostwald Process, which became the principle way of producing nitric acid.
Oxygen was discovered in 1772 by Carl Wilhelm Scheele, but he did  not publish his discovery until after Joseph Priestly had published  his independent discovery of oxygen i â¦ n 1775. As a result, Priestly  is usually credited with the discovery.oseph Priestly, an English chemist, independently, discovered oxygen in 17 â¦ 74 and published his findings the same year, three years before Scheele published.