Crossword clues for xanthine
The Collaborative International Dictionary
Xanthine \Xan"thine\, n. Also Xanthin \Xan"thin\ . [Gr. xanqo`s yellow.] (Physiol. Chem.) A type of purine obtainable as a white microcrystalline powder, C5H4O2N4, present in muscle tissue, in the liver, spleen, pancreas, and other organs, and also in urine (in small quantities) and some urinary calculi, and in the juices of certain plants; -- so called because it leaves a yellow residue when evaporated to dryness with nitric acid. It is also present in guano. Xanthine is closely related to uric acid.
Wiktionary
n. (context chemistry English) Any of a group of alkaloids that include caffeine, theophylline, and theobromine as well as the parent compound, a precursor of uric acid found in many organs of the body.
WordNet
n. crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine
Wikipedia
Xanthine ( or ; archaically xanthic acid) (3,7-dihydropurine-2,6-dione), is a purine base found in most human body tissues and fluids and in other organisms. A number of stimulants are derived from xanthine, including caffeine and theobromine.
Xanthine is a product on the pathway of purine degradation.
- It is created from guanine by guanine deaminase.
- It is created from hypoxanthine by xanthine oxidoreductase.
- It is also created from xanthosine by purine nucleoside phosphorylase (PNP).
Xanthine is subsequently converted to uric acid by the action of the xanthine oxidase enzyme.
Studies reported in 2008, based on C/C isotopic ratios of organic compounds found in the Murchison meteorite, suggested that xanthine and related chemicals, including the RNA component uracil, were formed extraterrestrially. In August 2011, a report, based on NASA studies with meteorites found on Earth, was published suggesting xanthine and related organic molecules, including the DNA and RNA components adenine and guanine, were found in outer space.
Usage examples of "xanthine".
Nitroso Dye-stuffs -- Nitro Dye-stuffs -- Azo Dye-stuffs -- Substantive Cotton Dye-stuffs -- Azoxystilbene Dye-stuffs -- Hydrazones -- Ketoneimides -- Triphenylmethane Dye-stuffs -- Rosolic Acid Dye-stuffs -- Xanthene Dye-stuffs -- Xanthone Dye-stuffs -- Flavones -- Oxyketone Dye-stuffs -- Quinoline and Acridine Dye-stuffs -- Quinonimide or Diphenylamine Dye-stuffs -- The Azine Group: Eurhodines, Safranines and Indulines -- Eurhodines -- Safranines -- Quinoxalines -- Indigo -- Dye-stuffs of Unknown Constitution -- Sulphur or Sulphine Dye stuffs -- Development of the Artificial Dye-stuff Industry -- The Natural Dye-stuffs -- Mineral Colours -- Index.
I pick up the kettle and carefully pour boiling water into the funnel, where it will damp down the coffee grounds, extract the xanthine alkaloids and dissolve the half tab of Ex-Lax hidden in the powder, draining the sennoside glycosides and the highly diuretic caffeine into the mug of steaming coffee that, with any luck, will give Fiore a strong urge to take ten minutes on the can about half an hour after he drinks it.