11 Silk - TFTD Silk Silk Noun Latin sericus = fabric of the...

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TFTD: Silk Silk . Noun. Latin, sericus = fabric of the Seres (=Chinese). 1: A tough, lustrous fiber composed of two proteins: fibroin and sericin produced by a variety of arthropods
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Connections How does the national flag of India relate to a talk on silk?
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Who makes silk? Caterpillars (Lepidoptera) Some caddisflies (Trichoptera) Adult webspinners (Embioptera) Hymenoptera Arachnids
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What is silk? Silk is made up of amino acids produced in glands in various parts of the arthropod body and formed into chains of protein Between-chain Hydrogen bonds form sheets of protein
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Silk formation Silk Thread
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Properties of silk? Silk fibers have a triangular cross section with rounded corners This reflects light at many different angles, giving silk a natural shine
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Properties of silk Silk is one of the strongest natural fibers, but loses up to 20% of its strength when wet Its elasticity is moderate to poor: if elongated even a small amount it remains stretched Silk is a poor conductor of electricity and thus susceptible to static cling
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Tensile strength ( withstanding stress without permanent deformation or breaking ) is superior to that of high-grade steel, and as strong as Kevlar® Can stretch up to 40% of its length without breaking
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This note was uploaded on 11/08/2011 for the course PPSC 110 taught by Professor Staff during the Fall '04 term at Cal Poly.

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11 Silk - TFTD Silk Silk Noun Latin sericus = fabric of the...

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