“theophylline”的英文意思_释义_用法

单词

theophylline

释义

theophylline Chem.|θiːəʊˈfɪlaɪn|
[irreg. f. mod.L. thea tea + Gr. ϕύλλον leaf + -ine⁵.]
A colourless alkaloid, C₇H₈N₄O₂, found in tea-leaves.
1894in Morley & Muir Watts' Dict. Chem. IV. 682/2. 1899 Syd. Soc. Lex., Theophyllin,..an alkaloid discovered in tea. It is isomeric with the base obtained from cacao (theobromine) and with paraxanthin, but differs from them in its reactions.1957[see oral a. 4 b].1976Lancet 20 Nov. 1115/2 Theophylline..and caffeine have been shown to be strong prostaglandin antagonists and weak agonists.1983Daily Tel. 18 Aug. 8/6 The council found that tea has three bracing ingredients—caffeine which stimulates the nervous system, and theophylline and theobromine which relax muscles and stimulate the heart.

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