Zirconium hydride an ore, usually a zirconium silicate, such as zircon. Zirconium is extracted from zirconium ore by removing the oxygen and silica. This process, known as the Kroll process, was first applied to titanium. The Kroll process results in an alloy containing hafnium. The hafnium and other impurities are removed in a subsequent step. Zirconium hydride is created by combining refined zirconium with hydrogen. Like titanium, solid zirconium dissolves hydrogen quite readily. The density of zirconium hydride varies based the hydrogen and ranges between 5.56 and 6.52 g cm. Even in the narrow range of concentrations which make up zirconium hydride,
Synthetic cannabinoids were originally used for cannabinoid research focusing on tetrahydrocannabinol (THC), the main psychoactive and analgesic compound found in the cannabis plant. Synthetic cannabinoids were used in part due to legal restrictions on natural cannabinoids, which make them very hard to obtain for research. Tritium-labelled cannabinoids such as CP-55,940 were instrumental in discovering the cannabinoid receptors in the early 1990s. Some early synthetic cannabinoids were also used in clinics. Nabilone, a first generation synthetic THC analog, has been used as an antiemetic, a drug to combat vomiting and nausea, since 1981. Synthetic THC (marinol, dronabinol) has been used as an antiemetic