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BIOMATERIALS - Coggle Diagram

- - - - Fibrous protein found in : horn, hair hoof feathers, etc.
      - Important component: Amino acid cysteine
      - Hair Keratin (α-Kerathin)
        
        Fibrous Keratin, Secondary structure: Helix
        
        Herarchical structure
        
        Softening by water
        
        hightly viscoelastic
      - Feather keratin
        
        Fibrous protein
        
        Mechanical properties
        
        twice as stiff as hair
        
        Very elastic
        
        Structural properties
        
        non-crystalline sections rich in cystine
        
        large crystalline regions with many hydrophobic residues
    - - Firbous structural protein, based on beta sheets and not occuring in human body
      - Types
        
        Silkworm silk
        
        used for prduction clothing
        
        Beta sheet
        
        Regular arrangement of Alanine and Glycine
        
        Spider silk
        
        stiff and tough, complicated
        
        Strong and light-weight
        
        Dragline Silk
        
        Major ampullate silk
        
        Mechanical properties vary with production processes, but, in general High Strength
      - Capture Silk