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Billaud camille m1_eftis_spider_silk_2nd_passage


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Billaud camille m1_eftis_spider_silk_2nd_passage

  1. 1. The amazing properties of spider silk BILLAUD Camille - M1 EFTIS
  2. 2. Plan <ul><li>What are the amazing properties of spider silk? </li></ul><ul><li>What could we do with spider silk? </li></ul><ul><li>How to reproduce artificially spider silk? </li></ul>
  3. 3. What are the amazing properties of spider silk? <ul><li>Stronger and more elastic than steel </li></ul><ul><li>More resistant than kevlar </li></ul><ul><li>Insoluble in water </li></ul><ul><li>Light </li></ul>Spider silk is :
  4. 4. <ul><li>Can absorb as much water as wool </li></ul><ul><li>A spider doesn't swing in its thread and spins it in a straight line </li></ul><ul><li>Shape memory </li></ul>
  5. 5. What could we do with spider silk? <ul><li>In the army : </li></ul><ul><li>bulletproof clothes </li></ul><ul><li>In medicine : </li></ul><ul><ul><li>stronger surgical sutures </li></ul></ul><ul><ul><li>artificial tendons </li></ul></ul><ul><ul><li>artificial ligaments </li></ul></ul><ul><li>In sport : </li></ul><ul><li>stronger parachutes </li></ul>
  6. 6. 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 !
  7. 7. 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…
  8. 8. <ul><li>The alignment of protein fibers </li></ul><ul><li>The stretching by the spider </li></ul><ul><li>The drying </li></ul>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.
  9. 9. One of the ideas is described in the following video :
  10. 10. 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 !!
  11. 11. 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 :
  12. 12. Conclusion <ul><li>These synthetic fibers could be marketed to do surgical sutures </li></ul><ul><li>But they are not strong enough to produce bulletproof jackets so it remains to improve the quality of the fiber </li></ul><ul><li>The number of transgenic goats is insufficient to produce artificial silk in industrial quantity </li></ul>
  13. 13. Bibliography Does anyone have questions ? Thank you and bye bye !