Natural rubber Natural rubber Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water. Malaysia and Indonesia are two of the leading rubber producers. Forms of polyisoprene that are used as natural rubbers are classified as elastomers. Currently, rubber is harvested mainly in the form of the latex from the rubber tree or others. The latex is a sticky, milky colloid drawn off by making incisions in the bark and collecting the fluid in vessels in a process called "tapping". The latex then is
Substance-related disorder Substance-related disorders were originally subcategorized into "substance use disorders" (SUD) and "substance-induced disorders" (SID). Though DSM-IV makes a firm distinction between the two, SIDs often occur in the context of SUDs. Substance-induced disorders include medical conditions that can be directly attributed to the use of a substance. These conditions include intoxication, withdrawal, substance-induced delirium, substance-induced psychosis, and substance-induced mood disorders. Substance use disorders include substance abuse and substance dependence. In DSM-IV, the conditions are formally diagnosed as one or the other, but it has been proposed that DSM-V combine the two into a single condition called "Substance-use disorder". The more