Presentation on theme: "Appearance of real linear polymer chains as recorded using an atomic force microscope on surface under liquid medium. Chain contour length for this polymer."— Presentation transcript:
Appearance of real linear polymer chains as recorded using an atomic force microscope on surface under liquid medium. Chain contour length for this polymer is ~204 nm; thickness is ~0.4 nm. (The contour length of a polymer chain is its length at maximum physically possible extension). contour length Linear Polymers:
Functions of Proteins All enzymes are proteins. Structural: e.g. collagen in teehth and bone; keratin in skin, hair and nails. Contractile proteins: actin and myosin in muscles allow contraction and therefore movement. Hormones: many hormones have a protein structure (e.g. insulin, glucagon, growth hormone). Transport: for example, haemoglobin facilitates the transport of oxygen around the body Defence: immunoglobulins (antibodies) protect the body against foreign invaders; fibrinogen in the blood is vital for the clotting process.
(polymer of the N-Acetylglucosamine units) Chitin the exoskeletons of crabs, lobsters and shrimps
Cellulose nitrate Semi-synthetic Polymers: Cellulose nitrate and cellulose acetate Cellulose triacetate obtained from natural polymers by subjecting them to some chemical processes
Bakelite (1909) 1950s Black Bakelite Telephone Blue Bakelite Handle Synthetic Polymers Bakelite Sockets & Switches