Zeotropic mixture harmful effects that hydrochlorofluorocarbons (HCFC) and chlorofluorocarbons (CFC) have on the ozone layer and global warming. Researchers have focused on using new mixtures that have the same properties as past refrigerants to phase out harmful halogenated substances, in accordance to the Montreal Protocol and Kyoto Protocol. For example, researchers found that zeotropic mixture R-404A can replace R-12, a CFC, in household refrigerators. However, there are some technical difficulties for using zeotropic mixtures. This includes leakages, as well as the high temperature glide associated with substances of different boiling points, though the temperature glide can be matched to the temperature difference
United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances stereoisomers in EU Category 1. See also the article: drug precursors The salts of the substances listed in this Table whenever the existence of such salts is possible. The salts of the substances listed in this Table whenever the existence of such salts is possible. The salts of hydrochloric acid and sulphuric acid are specifically excluded from Table II. United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances The United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances of 1988 is one of three major drug control treaties currently in force. It provides additional