Movement at the molecular level Diffusion:<rp2>=6Dt(D≈6πμa) Typical numbers 10 nm protein in water D=10-10 m2/s Image removed due to in cells D=10-12 m /s(D=10-14 m2/s lipids) copyright considerations [<r2>12=1 um, t-0.2 sec in cells [<r2>12=10 um, t-20 sec in cell Slow and isotropic How to generate fast vectorial motion Axonal transport of organelles in giant squids 22803BEH410-10.537JMovement at the Molecular Level Diffusion: <r2> = 6 D t (D≈6 π µ a) Typical numbers: Image removed due to 10 nm protein in water D= 10-10 m2/s ….in cells D= 10-12 m2/s (D= 10-14 m2/s lipids) copyright considerations. [<r2>]1/2 =1 µm, t ~0.2 sec in cells [<r2>]1/2 =10 µm, t ~20 sec in cells Slow and isotropic. How to generate fast vectorial motion ? Axonal transport of organelles in giant squids 2/28/03 BEH 410-10.537J 1