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proteins [2012/11/20 11:36]
landon [Software for analyzing protein structure]
proteins [2013/01/09 14:19] (current)
ethanminot
Line 133: Line 133:
  
 So an oxygen molecule will take about 5 seconds to diffuse through 10 microns of water. However, to move 1 cm through water (by pure diffusion) it would take a full day. Cells (which are about 10 microns in size) are designed to work by diffusive transport on the time scale of seconds to minutes. So an oxygen molecule will take about 5 seconds to diffuse through 10 microns of water. However, to move 1 cm through water (by pure diffusion) it would take a full day. Cells (which are about 10 microns in size) are designed to work by diffusive transport on the time scale of seconds to minutes.
 +
 +===== Lengths scales vs. Concentration =====
 +
 +^Concentration^Number density^Avg separation|
 +|10 mM|6e24 per cubic meter|5 nm|
 +|10 uM|6e21 per cubic meter|50 nm|
 +|10 nM|6e18 per cubic meter|500 nm|
  
 ===== Electrostatics ===== ===== Electrostatics =====

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