| 词汇 | melanin |
| 释义 | melanin noun[ U ] uk /ˈmel.ə.nɪn/ us /ˈmel.ə.nɪn/ a dark brown pigment (= substance that gives colour), found in eyes, skin, hair, feathers, etc. It helps to protect the skin against harmful light from the sun.黑色素 Biochemistry adipose adrenalin albumin aldosterone amino acid endonuclease endorphin enzymatic enzymatically enzyme mRNA mycoprotein non-enzymatic nuclease nucleic acid spike protein T level testosterone trace element transfer RNA Examples of melaninmelanin A crystal of phenylthiourea was added to samples to be used for electrophoresis to inhibit melanin formation. The precise structure of natural melanin is not known, because of its poor solubility and its association with proteins and lipids. This suggests that dark-adapted thresholds are directly related to rhodopsin levels regardless of the level of ocular melanin. The melanin content did not increase with fish length. Very occasionally, melanin pigmentation of the skin may occur. This lack of generality stands contrary to the proposed role of melanin pigment in retinal development and thus militates against this mechanism. The liver macrophages of chub which never aggregate contain haemosiderin but are devoid of melanin. The conjunctiva, sclera and iris are heavily pigmented with melanin granules and the iris contains gold-reflecting material, which is mostly obscured by the pigmented layer. The snail tissue is also nearly transparent, except for the digestive gland and mantle tissue which is spotted with melanin. The monotonic absorption profile with no specific features can be explained by the complexity of the melanin structure. Our findings have implications for understanding the role of melanin or related agents in the process of mammalian retinal development. It leaks more slowly and, due to the stimulating wavelength, provides greater visualization of structures hidden by blood, exudate, lipid or melanin. It is suggested that the delayed production in hardness may be associated with the presence of a reducing chemical environment produced by antioxidant properties of melanins. Does melanin do more than protect from light? Melanin containing cells of teleost fish and their relation to disease. 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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