Presentation on theme: "Spider Silk Dawson Bausman March 28, 2002. Variations Golden Orb Web Weaver."— Presentation transcript:
Spider Silk Dawson Bausman March 28, 2002
Variations Golden Orb Web Weaver
Spider Silk Where does it come from? What is it? What are its advantageous properties? How can it be mass produced? What are the applications?
Where does it come from?
The seven glands are: Ampulleceae major and minor for walking threads and dragline Pyriformes for the attaching threads Aciniformes for encapsulating prey Tubiliformes for the silk of the egg-sac Coronatae threads for the axis of the sticking threads Glandula aggregata for the sticky binding material
Silk Releasing Tubes ,000 tubes Strands as small as 20 nanometers
Each fiber only 4 to 5 microns in diameter Entire strand about 15 to 20 microns in diameter
What is it? 30% to 45% crystalline
What is it? More than 50% of silk is a polymerized protein called fibroine.
What is it? Exact sequence and structure unknown (at least unpublished) Main contents are 7 natural Amino Acids Alanine and Glycine Glutamine, Leucine, Arginine, Tyrosine, Serine
What is it? 2 Alanine rich proteins embedded in a jelly like glycine rich polymer 1 protein is highly ordered crystalline, other is not ordered. These proteins give toughness.
What is it? How can proteins compete with Kevlar???
Advantageous Properties Tailorable Properties
Advantageous Properties Normal5x20x
Diameter Average is.15 mm Smallest Measured is.02 mm Human Detection Insect Detection of the web
Advantageous Properties Coated with antiseptic agents (pyrolidin, potassium hydrogen phosphate and potassium nitrate) Process proteins from water based solutions Water
Mechanical Properties Inelastic or Elastic Tough at low temperatures Tensile Strength of 400,000 lbs / sq. in 25% lighter than other synthetic petroleum based fibers Specific Strength
Nature vs. Man Nature is uncertain and slow Farming is not possible
Mass Production 22,000 base pairs to the genetic sequence Believed to only need 300 of these pairs
Mass Production Plants, Fungi, Bacteria Mammals
Webster and Pete
Uses Past – WWI Cross hairs, Tribal uses
Uses Medical - sutures, tendons, ligaments –$10,000/gram
Uses Textile Industry
Bullet Proof Vests
Space Station Coatings
Biodegradable Fishing Line
Conclusions: Spider Silk is an excellent tailorable fiber material There is quite a bit of work yet to be done to perfect the process of making silk There are many potential applications of silk
Acknowledgements: Jeffery Turner and Chantal LaRouche of Nexia Biotechnologies David Knight and Fritz Vollrath of Oxford University Randy Lewis of the University of Wyoming