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Bacteria can be forced to make the hardest kind of spider silk



Bacteria help to make engineering silk, which competes with the strength and stretch of hard silk of the spider, the type from which the spider-like hairs are hanging.

Pound per pound, silk silk is stronger and harder than steel. Engineers of the decade tried to create synthetic mimics from genetically modified bacteria, yeasts and even goat's milk, but they were always short. Part of the problem is that genetic information for silk draglane is a long chain of repetitive DNA. And those devices that previously tested the organisms, accidentally changed or broken such series. To overcome this problem, the researchers accurately divided the repeat DNA into bits and inserted each repeat part in E. coli microbe. These smaller pieces were less likely to be further modified within the bacteria, and each microbe then followed the genetic instructions for a short silk thread. The researchers added to the end of each thread a chemical label that glued individual fibers together.

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