Ozone–oxygen cycle Ozone–oxygen cycle The ozone–oxygen cycle is the process by which ozone is continually regenerated in Earth's stratosphere, converting ultraviolet radiation (UV) into heat. In 1930 Sydney Chapman resolved the chemistry involved. The process is commonly called the Chapman cycle by atmospheric scientists. Most of the ozone production occurs in the tropical upper stratosphere and mesosphere. The total mass of ozone produced per day over the globe is about 400 million metric tons. The global mass of ozone is relatively constant at about 3 billion metric tons, meaning the Sun produces about 12% of the ozone layer each day. And if
S-Nitrosothiol exist for their synthesis. They can be synthesized from thiols using NaNO/H+, NO, NO, HNO, NOCl, RONO, NO, HNO, bovine aortic endothelial cells, among others. NaNO/H+ and "tert"-butyl nitrite (tBuONO) are commonly used. Once formed, these deeply colored compounds are often thermally unstable with respect to formation of the disulfide and nitric oxide: "S"-Nitrosothiols release NO upon treatment with acids: and they can transfer nitroso groups to other thiols: "S"-Nitrosothiols can be detected with UV-vis spectroscopy. S-Nitrosothiol "S"-Nitrosothiols, also known as thionitrites, are organic compounds or functional groups containing a nitroso group attached to the sulfur atom of a thiol.