But we can’t breed spiders because they kill each other … So, what is the solution ? So spider silk is very useful GRRR !!! Yum Yum !
How to reproduce artificially spider silk? Scientists have studied how spiders make their silk: Silk proteins are long molecules form a viscous solution passes in a very fine canal of spider’s gland molecules become aligned The spider stretches the gel before it dries viscosity drops by a factor of 500 or more…
that gives silk threads their amazing strength So, it’s the combination of the three things : The problem is how to produce the spider fiber silk proteins ? Scientists know how to stretch and dry the fiber.
One of the ideas is described in the following video : http://www.youtube.com/watch?v=fRTZMhYWKmY&NR=1
One of the ideas is : to produce the spider silk proteins in the milk of goats Transgenic goats produce in their milk spider silk proteins ! The spider silk genes are introduced into goat embryos The embryos are implanted in surrogate mothers At birth, kids are carriers of spider silk genes !!
Proteins are separated from the milk and purified They pass under pressure in microscopic holes to force them to align. The thread is stretched to give it its mechanical properties We obtain transgenic thread ! To obtain transgenic thread :
These synthetic fibers could be marketed to do surgical sutures
But they are not strong enough to produce bulletproof jackets so it remains to improve the quality of the fiber
The number of transgenic goats is insufficient to produce artificial silk in industrial quantity
Bibliography http://www.futura-sciences.com/fr/news/t/recherche/d/le-secret-des-proprietes-exceptionnelles-du-fil-daraignee_8589/ http://www.futura-sciences.com/fr/news/t/physique-1/d/le-fil-daraignee-ou-larme-de-la-biotechnologie_4934/ http://www.radio-canada.ca/actualite/decouverte/reportages/2002/09-2002/29sept_2002/araignee.html http://www.eurekalert.org/pub_releases/2006-10/miot-mep103006.php http://www.youtube.com/watch?v=fRTZMhYWKmY&NR=1 Does anyone have questions ? Thank you and bye bye !