The hard outer shell of arthropods and insects like beetles is primarily made up of chitin, a naturally occurring biopolymer. Synonyms for chitinous in Free Thesaurus. Chitin Definition. Arthropod definition, any invertebrate of the phylum Arthropoda, having a segmented body, jointed limbs, and usually a chitinous shell that undergoes moltings, including the insects, spiders and other arachnids, crustaceans, and myriapods. In 1840 there were 53 Shell families living in Pennsylvania. The following BiologyWise article elaborates more on the structure, function, and uses of chitin. 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, a derivative of glucose.This polysaccharide is a primary component of cell walls in fungi, the exoskeletons of arthropods, such as crustaceans and insects, the radulae of molluscs, cephalopod beaks, and the scales of fish and skin of lissamphibians. See more. Chitin is found in the exoskeletons of insects, the cell walls of fungi, and certain hard structures in invertebrates and fish.In terms of abundance, chitin is second to only cellulose. Chitin is the main structural component of shells of crustaceans, exoskeleton of insects, fungal cell wall and protozoa. The annual worldwide turnover of chitin is around 100 billion tons 2. Chiton definition is - any of a class (Polyplacophora) of elongated bilaterally symmetrical marine mollusks with a dorsal shell of calcareous plates. Based on amino acid sequences present chitinases are the enzymes that catalyze chitin degradation and divided into Family 18 and 19 of glycosyl hydrolase 1. Nautilus Shell Meaning in Jewelry by Norma K on Oct 05, 2018 4 comments The chambered nautilus is an ancient creature related to squids and octopuses and … The intrinsic viscosities of the resulting chitin were determined and the intrinsic viscosities of the chitin from the different shrimp shell samples are shown in Table 3 together with their estimated molecular weights, as determined from the MHS-equation using K … What are synonyms for chitinous? Pennsylvania had the highest population of Shell families in 1840. The most Shell families were found in the USA in 1880. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Chitin Chitin is a major constituent of the exoskeleton, or external skeleton, of many arthropods such as insects, spiders, and crustaceans. This was about 23% of all the recorded Shell's in the USA. 3 words related to chitin: glucosamine, polyose, polysaccharide. 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