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Spider silk structure: crystalline beta-sheets separated by amorphous linkages. Silks have a hierarchical structure. The primary structure is the amino acid sequence of its proteins (), mainly consisting of highly repetitive glycine and alanine blocks, [4] [5] which is why silks are often referred to as a block co-polymer.
Spiders make spider silk for various purposes such as weaving their webs, protecting their eggs or as a safety line. The amphipod Peramphithoe femorata uses silk to make a nest out of kelp blades. Another amphipod, Crassicorophium bonellii, use silk to build shelter. Carp produce fibroin units, a component of silk, to attach their eggs to rocks ...
Sericulture, or silk farming, is the cultivation of silkworms to produce silk. Although there are several commercial species of silkworms, the caterpillar of the domestic silkmoth is the most widely used and intensively studied silkworm.
Silk taken from various species has been used since ancient times, either in its natural state or after some form of preparation. Spider webs were used as a wound dressing in ancient Greece and Rome, [2] and as a base for painting from the 16th century. [3] Caterpillar nests were used to make containers and fabric in the Aztec Empire. [1] [4]
The average toughness of the fibres is 350 MJ/m 3, and some are up to 520 MJ/m 3, making the silk twice as tough as any other spider silk known. [8] The web of Darwin's bark spider is remarkable in that it is not only the longest spanning web ever observed, but is the largest orb web ever seen, at an area of up to 2.8 square metres (30 sq ft). [2]
These wolf spiders have smaller chelicerae and more wavy dorsal stripes than other spiders in this family. They have yellow spots on their abdomen and males have white hairs on their kneecaps. [ 5 ] Shore spiders are a smaller spider, as the largest female is approximately 6.2 mm in length and the largest male is approximately 4.7 mm. [ 6 ...
A couple has been arrested after authorities say they performed a botched circumcision on their son at their central Missouri home last week.. Prosecutors charged Tyler Wade Gibson, 35, with one ...
Silk is a naturally produced fibre obtained from many species of the silk moth. In 1700 the favoured silk was produced by a moth (Bombyx mori), that spun a cocoon to protect the larvae. The larvae fed on mulberry leaves grown in Italy. Silk fibres from the Bombyx mori silkworm have a triangular cross section with rounded corners, 5–10 μm wide.