| 词汇 | chitin |
| 释义 | chitin noun[ U ] biology specializeduk /ˈkaɪ.tɪn/ us /ˈkaɪ.tən/ a hard substance in the outer shell of insects and animals such as shrimp and lobster, and in the cell walls of some fungi壳质（某些生物体表坚硬的保护层，如昆虫、虾，龙虾的外壳和部分真菌的细胞壁） Fruits & seeds & their parts ackee aronia barberry bergamot bur caryopsis chaff cone flesh peel pine nut pip pith pithy poppy seed radicle radicular seed coat seed pod seedless You can also find related words, phrases, and synonyms in the topics: The skin, hair & bone of non-human animals Chitin, a white horny substance found in the exoskeleton of several invertebrate animals. It would be soft but for the chitin, as the horny substance is called. The whole outer shell of the insect is made of the horny chitin. There is no chitin in the skin between the segments. They are worked by powerful muscles, and are supported, like a fan, by ribs of chitin, which may be accompanied by air-tubes, blood-channels, and nerves. chitin | American Dictionarychitin noun[ U ] us/ˈkɑɪ·tən/ biology a strong substance in the outer covering of insects and animals such as lobsters, and in the cell walls of some fungi Examples of chitinchitin The protein elements may be derived from reticulate granules and chitin from the glycogen reserves of the oocyte. Alvinellids make complex chitin tube colonies on the flanks of black smoker chimneys. Within marine chitin-containing organisms, the -type is abundant and chitosan can also be found. Each lamella was generated by the deposition of parallel sheets or laminae of chitin microfibrils. The residual antifungal activity of the inactive mutant forms might be due to their ability to bind chitin. Body-wall with one bilateral pair of incisions, each surrounded by a circular patch of dark chitin. The pogonophorans produce tubes that consist of protein and chitin. The change in appearance of the developing shell layers as they became more fibrillar may reflect the formation of chitin-protein complexes. Accessory plates -long superficial strips of hard chitin, salient posteriorly. Activity on nascent and preformed chitin. The structure of chitin is comparable to the polysaccharide cellulose, forming crystalline nanofibrils or whiskers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Many organisms can easily break down starches into glucose, however, most organisms can not metabolize cellulose or other polysaccharides like chitin and arabinoxylans. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Chitin color differs between males and females, being blue for the males and aquamarine for females, deepening to purple in old age. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are streaked with brown and purple and are housed in a transparent, gelatinous sheath composed of protein and chitin. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This serosa secretes a cuticle rich in chitin that protects the embryo against desiccation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. 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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