| 词汇 | keratin |
| 释义 | keratin noun[ C or U ] biology specializeduk /ˈker.ə.tɪn/ us /ˈker.ə.tɪn/ a strong natural protein, which is the main substance that forms hair, nails, hooves, horns, feathers, etc.: 角蛋白（一种坚韧、无色的天然蛋白质，是发、甲、蹄、角、羽毛等的主要组成物） Rhino horn is made of keratin, the same material as hair and fingernails. We have studied the composition, shape, and behaviour of feather keratins. Without biotin, also known as vitamin B7 or vitamin H, the body cannot metabolize keratin to make nails. Keratin makes the nails strong, but external trauma or an underlying health condition can cause thin layers of the nail to peel away. Mohair fibre, like wool, is composed chiefly of the protein substance keratin. Scientists have documented population collapses among these frogs due to a fungus which infects keratin, a hard protein that forms the outer layer of frogs' skin. Different types of filaments are composed by a variety of proteins, including keratins. 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 keratinkeratin These data indicate that these keratin intermediate filament may have a ' hollow ' core. It remains to be seen whether this observation is a general one for all intermediate filaments or whether it relates specifically to the trichocyte keratins. Conservation of the structure of keratin intermediate filaments : molecular mechanism by which different keratin molecules integrate into preexisting keratin intermediate filaments during differentiation. The cellular and molecular biology of keratins: beginning a new era. The protein contained a glycinerich region with similarity to host keratins and collagen. However, in the 1970s two other sequences, both from sheep wool keratins were characterized. So far no discussion has been made of the trichocyte keratins. Similarly, in keratinocytes, keratin molecules containing one particular chain pair will ultimately be replaced by molecules comprising a different chain pair as differentiation proceeds. The most common were actinrelated and keratin-associated proteins. Plakins serve two roles: they anchor the keratin intermediate filaments to the nuclear and plasma membranes, and they connect intermediate filaments, microtubules and microfilaments together. Repeating patterns of amino acid residues in the sequences of some high-sulphur proteins from keratin. Diversity of intermediate filament structure : evidence that the alignment of coiled-coil molecules in vimentin is different from that in keratin intermediate filaments. These may not be inhibited by heavy metals, but are unable to initiate a proper cyst without the presence of the ' keratin-like ' granules. A thick layer of keratin develops, to which the patient is usually oblivious, and autolysis takes place underneath. 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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