| 词汇 | melatonin |
| 释义 | melatonin noun[ U ] chemistry, biology specializeduk /mel.əˈtəʊ.nɪn/ us /mel.əˈtoʊ.nɪn/ a hormone in the body that produces changes in skin colour and is involved in controlling biorhythms such as our sleep pattern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 abductor accessorius ACL actin adductor fundus funiculus fusiform glomerular glomerulus myosin navicular neuroendocrine neurohormonal neurohormone tendinis tendinous tendinum tendo tensor Examples of melatoninmelatonin Evening saliva samples were obtained before and after treatment for ascertainment of circadian melatonin rhythm phase. Cloning and characterization of a mammalian melatonin receptor that mediates reproductive and circadian responses. Circadian clocks located in the photoreceptors and retinal neurons regulate melatonin synthesis in the eye. Effects of supplementing pregnant heifers with methionine or melatonin on the anatomy and other characteristics of their lateral hind claws. For instance, the relationship between melatonin and depression, the changes in testosterone levels, and diminished immune functionality cry out for further work. Significantly higher intensities of 580- and 650-nm light were required for melatonin suppression. During the procedure continuous measures of the circadian rhythm are taken, typically including rectal temperature, melatonin, and cortisol. Figure 4 illustrates the biosynthetic pathway for the synthesis of melatonin from tryptophan. The administration of exogenous melatonin has equivocal evidence in the promotion of a healthy sleep cycle and alleviation of behaviour problems. A probable explanation for the decrease in dopamine content is an inhibitory effect of melatonin on dopamine synthesis. There is considerable evidence for functional interactions of melatonin and dopamine in the retina. The output of the hormone melatonin, implicated in synchronization of the sleep/wake cycle, is frequently impaired in dementia. Additionally, the presence of melatonin receptor protein on putative retinal efferent fibers suggests a role for melatonin in the central control of retinal sensitivity. Indeed, dopamine and melatonin may act as mutually inhibitory retinal signals for day and night. Despite this general decrease in dopamine levels, our melatonin-injected mice displayed a clear rhythm of dopamine content. 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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