Lecture_6_2011

Lecture_6_2011 - Introduction to Biophysics Lecture 6...

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Introduction to Biophysics Lecture 6 Brownian motion Diffusion
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Transport across the membrane and inside the cell, role of thermal fluctuations.
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Brownian motion Botanist Robert Brown, 1828 Pollen grains 1 μ m in diameter can be observed in visible microscope (the wavelength of visible light is about 1/2 μ m.) Concerns: How collisions with very small molecules (nm size) can move “huge” pollen grain? Displacements seen in microscope are huge in comparison with size of molecules. Collisions rates of water molecules are about 10 12 per seconds (10 3 m/sec / 10 -9 nm). Our eyes can resolve events at rates no faster than 30 s -1 http://www.youtube.com/watch?v=2Vdjin734gE
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Calculating probabilities 2 steps walk, probability of coming back to starting point P 0 = 2/2 2 =0.5 How to do calculation for large number (10000 steps)? M 0 – number of different outcomes that land us at the starting point. Should have equal number of heads and tails (5000). Describe them as list containing 5000 different integers (n
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This note was uploaded on 12/09/2011 for the course PHYS 570 taught by Professor Staff during the Fall '08 term at Purdue.

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Lecture_6_2011 - Introduction to Biophysics Lecture 6...

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