| 词汇 | caffeine |
| 释义 | caffeine noun[ U ] uk /ˈkæf.iːn/ us /ˈkæf.iːn/ a stimulant chemical (= something that makes people more active) that is found in food and drink made from some plants, including coffee, tea and chocolate Specific types of drug acaricide alprazolam amnesiac anaphrodisiac anti-AIDS Dexedrine digoxin dissociative E, e ecstasy gas and air heroin pep pill popper roach smack tetrahydrocannabinol truth serum visionary Xanax Caffeine wakes us up and gives us energy. Many people like tea and coffee because of the caffeine in these drinks. Effects of Tea and Coffee. —In addition to the stimulating agent caffeine, tea and coffee contain a bitter, astringent substance, known as tannin. In chemical composition caffeine closely resembles a waste, called uric acid, and in the body is converted into this substance. Tea and coffee contain a drug, called caffeine, which acts upon the nervous system and which may, on this account, interfere with the proper control of the heart. The first trial to combat or prevent this drowsiness was made with caffeine. They are usually so addicted to caffeine, cigarettes, alcohol, and so forth, that when they had fasted, even briefly, their bodies were forced to dip into highly-polluted fat reserves while simultaneously the body begins withdrawal. caffeine | American Dictionarycaffeine noun[ U ] us/kæˈfin, ˈkæf·in/ a chemical found in coffee and tea that is a stimulant (= something that tends to make you more active) Examples of caffeinecaffeine These results clearly indicate that caffeine treatment during prolonged maturation culture decreases the frequency of development to the blastocyst stage but not embryo quality. The majority of caffeine-treated oocytes had a germinal vesicle with a nucleolus surrounded by ring- or horseshoe-shaped chromatin. However, an association of caffeine use with breech birth was found. However, no study of the effect of caffeine on the meiotic process of porcine oocytes has been performed. The authors found that doses of caffeine higher than 450 g/ml in the culture medium inhibited oocyte maturation. The initial fertility consultation: recommendations concerning cigarette smoking, body mass index, and alcohol and caffeine consumption. Participants were permitted to use their typical amounts of tobacco and caffeine in order to avoid confounds associated with nicotine or caffeine withdrawal. However, the effects of caffeine during oocyte aging on embryonic development have not yet been studied. Quantitative liver function in the elderly assessed by galactose elimination capacity, antipyrine demethylation and caffeine clearance. All participants were asked to abstain from caffeine for the day and to ingest only fluids after 1500 hr on the day of the study. Nor did the year 1800 bring with it any lessening of interest in caffeine. They provided the institutional framework for a flourishing culture of caffeine. Synergistic effect of caffeine and heparin on in vitro fertilization of cattle oocytes matured in culture. However, slightly increased penetration activity was shown also in spermatozoa incubated with heparin and caffeine (42.3% and 37.3%, respectively). We confirmed that the rates of blastocyst formation from aged oocytes treated with or without caffeine were significantly lower than that of the control group. 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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