BIOL 201 Lecture Notes - Lecture 2: Cytoplasm, Reynolds Number
14 Jun 2016
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Cytoplasm is crowded lots of study inside it ions 0. 1 nm. Protein crystals 20-60% protein by weight (40-80 % is water) Rbc: 35 % protein by weight (65% water) Cytoplasm as crowded as a protein crystal. Cytoplasm is a rough and tumble place. All the molecules are being violently collided by other molecules at all time they are constantly collided by water molecules and proteins. Molecules move continuously die to brownian motion. Coming form the random kinetic energy of heat. Molecules diffuse with a characteristic diffusion coefficient (d) Smaller molecules -> faster diffusion -> larger d. Explores a lot of space but you get nowhere (on average) Cytoplasm is viscous inertia: resistance of an object to any change in its state of motion. A measure of a fluids resistance to flow. Cells, organelles and proteins are in a low reynolds number environment in water re = 10^4. The tendency of an object to return to its original shape after deformation.
