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caffeine    音标拼音: [kæf'in]
n. 咖啡因,茶精(兴奋剂)

咖啡因,茶精(兴奋剂)

caffeine
n 1: a bitter alkaloid found in coffee and tea that is
responsible for their stimulating effects [synonym: {caffeine},
{caffein}]

caffein \caf*fe"in\, Caffeine \Caf*fe"ine\, n. [Cf. F.
caf['e]ine. See {Coffee}.] (Chem.)
A white, bitter, crystallizable substance, found in coffee
and tea. It is identical with the alkaloid {theine} from tea
leaves, and with {guaranine} from guarana. It is responsible
for most of the stimulating effect of coffee or tea.
[1913 Webster WordNet 1.5]

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  • Caffeine - Wikipedia
    The most common sources of caffeine for human consumption are the tea leaves of the Camellia sinensis plant and the coffee bean, the seed of the Coffea plant Steeping the plant product in water—a process called infusion —extracts the caffeine and other components for various purposes
  • Caffeine: What It Is, Benefits and Side Effects
    What is caffeine? Caffeine is a type of drug called a stimulant, meaning it increases chemicals in your brain called neurotransmitters
  • Caffeine - Zhorn Software
    If you have problems with your PC locking or going to sleep, caffeine will keep it awake It works by simulating a keypress once every 59 seconds, so your machine thinks you're still working at the keyboard, so won't lock the screen or activate the screensaver
  • Caffeine: How much is too much? - Mayo Clinic
    Up to 400 milligrams (mg) of caffeine a day seems safe for most adults That's about the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks Keep in mind that the caffeine content in drinks varies widely
  • Caffeine | Description, Stimulant, Adenosine, Diuretic, Facts . . .
    caffeine, naturally occurring nitrogenous organic compound of the alkaloid group, widely known for its effects on the central nervous system, particularly its ability to increase alertness Caffeine is found in tea, coffee, guarana, maté, kola nuts, and cacao
  • What Is Caffeine, and Is It Good or Bad for Health?
    Caffeine is a natural stimulant found in coffee, tea, and cacao that works by blocking adenosine receptors in your brain, reducing tiredness and promoting alertness
  • Caffeine | C8H10N4O2 | CID 2519 - PubChem
    Caffeine is a trimethylxanthine in which the three methyl groups are located at positions 1, 3, and 7 A purine alkaloid that occurs naturally in tea and coffee
  • Caffeine - The Nutrition Source
    Although we tend to associate caffeine most often with coffee or tea, the research below focuses mainly on the health effects of caffeine itself Visit our features on coffee, tea, and energy drinks for more health information related to those beverages
  • Caffeine - Alcohol and Drug Foundation
    Discover how caffeine affects your body and mind as the world's most consumed stimulant Learn about sources, recommended limits, withdrawal symptoms, and health impacts
  • Caffeine content for coffee, tea, soda and more - Mayo Clinic
    Find out how much caffeine is in coffee, tea, soda and energy drinks You may be getting more caffeine than you think you are





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