| 单词 | melatonin |
| 释义 | melatonin noun[U] chemistry,biologyspecializeduk/mel.əˈtəʊ.nɪn/us/mel.əˈtoʊ.nɪn/ahormonein thebodythatproduceschangesinskincolourand isinvolvedincontrollingbiorhythmssuch asoursleeppattern 降黑素（体内的一种激素，能刺激肤色变化，与日常睡眠等生物节律有关）Substances & structures in the body
Examplesofmelatoninmelatonin Evening saliva samples were obtained before and after treatment for ascertainment of circadianmelatoninrhythm phase. From theCambridge English Corpus Cloning and characterization of a mammalianmelatoninreceptor that mediates reproductive and circadian responses. From theCambridge English Corpus Circadian clocks located in the photoreceptors and retinal neurons regulatemelatoninsynthesis in the eye. From theCambridge English Corpus Effects of supplementing pregnant heifers with methionine ormelatoninon the anatomy and other characteristics of their lateral hind claws. From theCambridge English Corpus For instance, the relationship betweenmelatoninand depression, the changes in testosterone levels, and diminished immune functionality cry out for further work. From theCambridge English Corpus Significantly higher intensities of 580- and 650-nm light were required formelatoninsuppression. From theCambridge English Corpus During the procedure continuous measures of the circadian rhythm are taken, typically including rectal temperature,melatonin, and cortisol. From theCambridge English Corpus Figure 4 illustrates the biosynthetic pathway for the synthesis ofmelatoninfrom tryptophan. From theCambridge English Corpus The administration of exogenousmelatoninhas equivocal evidence in the promotion of a healthy sleep cycle and alleviation of behaviour problems. From theCambridge English Corpus A probable explanation for the decrease in dopamine content is an inhibitory effect ofmelatoninon dopamine synthesis. From theCambridge English Corpus There is considerable evidence for functional interactions ofmelatoninand dopamine in the retina. From theCambridge English Corpus The output of the hormonemelatonin, implicated in synchronization of the sleep/wake cycle, is frequently impaired in dementia. From theCambridge English Corpus Additionally, the presence ofmelatoninreceptor protein on putative retinal efferent fibers suggests a role for melatonin in the central control of retinal sensitivity. From theCambridge English Corpus Indeed, dopamine andmelatoninmay act as mutually inhibitory retinal signals for day and night. From theCambridge English Corpus Despite this general decrease in dopamine levels, ourmelatonin-injected mice displayed a clear rhythm of dopamine content. From theCambridge English Corpus 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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