| 单词 | alkaloid |
| 释义 | alkaloid noun[C] chemistryspecializeduk/ˈæl.kə.lɔɪd/us/ˈæl.kə.lɔɪd/atypeofchemicalfoundinplantsthat oftenactsas adrugorpoison, or is used inmedicines: 生物碱（植物中的化学物质，常用于制药或作为毒物）Morphine andcocainearepowerfulalkaloids.吗啡和可卡因是强力的生物碱。 Chemistry: types of chemical
Examplesofalkaloidalkaloid In many leaves,alkaloidconcentrations range from 100 to 500 g g-1 fresh weight. From theCambridge English Corpus Most of the alkaloids and flavonoids are present in the flowers and in the ripe fruits. From theCambridge English Corpus The administered doses ofalkaloidand flavonoid fractions correspond to the proportion of these components in the crude extract used in the experiment. From theCambridge English Corpus Coffee plants containalkaloidcompounds that discourage herbivory. From theCambridge English Corpus This equation was also used to quantify consumption of saponins, cyanogenic glycosides and alkaloids. From theCambridge English Corpus A colour change from white to orange indicates presence ofalkaloidor related amines. From theCambridge English Corpus No differences were detected between lipid-poor and -rich seasons in levels of alkaloids, fibre or saponins. From theCambridge English Corpus It is not known whether disproportionately higher levels of alkaloids in other tissues, principally the phloem, contribute to this aphid resistance. From theCambridge English Corpus Table 3 shows the binding capacities of the soils from data set 1 for four alkaloids. From theCambridge English Corpus However, there is a difference because unexpectedly no changes in enzyme activity of cauda treated with crude andalkaloidextracts were noticeable. From theCambridge English Corpus The toxin adsorption capacities of soils in the first sample set were determined by capillary gas liquid chromatography using the alkaloids lupanine, sparteine, quinine and atropine. From theCambridge English Corpus All the ergot alkaloids increase the motor activity of the uterus, by producing persistent contractions in the inner zone of myometrium through a calcium channel mechanism. From theCambridge English Corpus There were no alkaloids or triterpenes. From theCambridge English Corpus The crude extract was obtained from plants collected at the beginning of the vegetative cycle, when they contained 0.095 g alkaloids and 1.50 g flavonoids per 100 g dry plant. From theCambridge English Corpus The working party on naturally occurring toxicants in food has completed its study of pyrrolizidine alkaloids in milk. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0 These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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