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Chitin (C 8 H 13 O 5 N) n (/ ˈ k aɪ t ɪ n / KY-tin) is a long-chain polymer of N-acetylglucosamine, an amide derivative of glucose. Chitin is the second most abundant polysaccharide in nature (behind only cellulose); an estimated 1 billion tons of chitin are produced each year in the biosphere. [1]
Arthropod cuticle is a biological composite material, consisting of two main portions: fibrous chains of alpha-chitin within a matrix of silk-like and globular proteins, of which the best-known is the rubbery protein called resilin. The relative abundance of these two main components varies from approximately 50/50 to 80/20 chitin protein, with ...
The following other wikis use this file: Usage on ar.wikipedia.org كايتين; استخدام أسيتات الكايتين لالتقاط غاز ثاني أكسيد الكربون والحد من التلوث
Pure chitin is a clear flexible substance and needs to be mixed with different proteins to form the structure found in other creatures. Chitin is combined with calcium carbonate when it is within crustacean shells and is combined with sclerotin to form insect cuticles. Chitin is used by several species most notably fungi and insects.
A free body diagram is not a scaled drawing, it is a diagram. The symbols used in a free body diagram depends upon how a body is modeled. [6] Free body diagrams consist of: A simplified version of the body (often a dot or a box) Forces shown as straight arrows pointing in the direction they act on the body
Many fossil tubes look like those made by modern sessile polychaetes, [60] but the first tubes clearly produced by polychaetes date from the Jurassic, less than 58] In 2012, a 508 million year old species of annelid found near the Burgess shale beds in British Columbia , Kootenayscolex , was found that changed the hypotheses about how the ...
By this method, body diagrams can be derived by pasting organs into one of the "plain" body images shown below. This method requires a graphics editor that can handle transparent images, in order to avoid white squares around the organs when pasting onto the body image. Pictures of organs are found on the project's main page. These were ...
In the anatomy of some taxa, such as many Cicadomorpha, the front of the head is fairly clearly distinguished and tends to be broad and sub-vertical; that median area commonly is taken to be the frons. [9] The clypeus is a sclerite between the face and labrum, which is dorsally separated from the frons by the frontoclypeal suture in primitive ...