منابع مشابه
How Spiders Spin Silk
Spider silk is wonderful stuff—light as the breeze and stretchy yet stronger than steel. People can manufacture synthetic fibers, such as Kevlar, that come close but can’t begin to match the process spiders use. Their silk proteins, called spidroins, rapidly convert from the soluble form to solid fibers at ambient temperatures and with water as the solvent. Not only is this beyond us, we don’t ...
متن کاملSilk Spinning in Silkworms and Spiders
Spiders and silkworms spin silks that outcompete the toughness of all natural and manmade fibers. Herein, we compare and contrast the spinning of silk in silkworms and spiders, with the aim of identifying features that are important for fiber formation. Although spiders and silkworms are very distantly related, some features of spinning silk seem to be universal. Both spiders and silkworms prod...
متن کاملGround spiders overwhelm victims with supersticky silk.
Most spiders are content to sit and wait for unsuspecting victims to blunder into their silken traps, but webs are only ever as good as the structures that secure them to the surfaces that support them. ‘This [attachment] is done with a special type of silk, called piriform’, says Jonas Wolff, from Macquarie University, Australia, adding that most spiders only produce this silk when they need t...
متن کاملA devonian spinneret: early evidence of spiders and silk use.
A nearly complete spider spinneret was found in Middle Devonian rocks (about 385 to 380 million years old) near Gilboa, New York. This is the earliest evidence yet discovered for silk production from opisthosomal spigots, and therefore for spiders. Two previously known Devonian fossils described as spiders lack any apomorphies of the order Araneae and are probably not spiders. The spigots of th...
متن کاملSpiders` Super-strong Silk Relies on Its Crystals
Spiders` silk is a natural material with great mechanical properties. Therefore, scientists are trying to find its secrets. Latest discovery has shown that spiders` silk is a protein, and its good mechanical properties lay in its tertiary structure: beta-sheet nanocrystals. The bonds in the structure are hydrogen, which are among the weakest bonds, however here in crystals hydrogen bonds brakes...
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ژورنال
عنوان ژورنال: Acta Arachnologica
سال: 1989
ISSN: 0001-5202
DOI: 10.2476/asjaa.38.21