PHYC452Biophysics:Assignments

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|HW #2
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| '''Due: Feb 20''':
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(1) Read Nelson Chapter 5-6
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(2) Ask or Answer a question related to our recent class content on the wiki page.
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(3) Nelson 5.5
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(4) You have two microcentrifuge tubes (a cylinder R=0.5cm, L=3cm), one with a solution of bacteria (R=1 micron) and one with a solution of eukaryotic cells (R=10 micron).  You want to exchange the buffer they are in, so you want to force all cells to a small pellet at the bottom of the tube using a centrifuge. You also don't want it to take more than 5 minutes.  If the centrifuge radius is 10 cm, how fast do you have to spin?  What is the acceleration in g?
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(5) Relate the last section of this paper: [http://www.biophysj.org/cgi/content/abstract/92/10/3706 Multiple Association States between Glycine Receptors and Gephyrin Identified by SPT Analysis] "Properties of the equilibrium of GlyR traveling into and out of gephyrin clusters" with the ideas in Nelson 6.6.4.  Make an argument that they calculated the potential energy in a cluster correctly (or incorrectly).
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(6) Physics Grads only: Derive the Hagen-Poiseuille relation from the Navier-Stokes equation.
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Revision as of 12:41, 14 February 2008

Physics 452: Biophysics, Spring 2008

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Homework Assignments

Homework is due at the beginning of class on the due date. No late homework accepted.

Homework Number Assignment, Due Date Links
HW #1 Due: Feb 11: Create an OWW Account and list yourself on our People Page. Read Nelson Chapter 1-4. Homework Problem Nelson #4.3.
HW #2 Due: Feb 20:

(1) Read Nelson Chapter 5-6

(2) Ask or Answer a question related to our recent class content on the wiki page.

(3) Nelson 5.5

(4) You have two microcentrifuge tubes (a cylinder R=0.5cm, L=3cm), one with a solution of bacteria (R=1 micron) and one with a solution of eukaryotic cells (R=10 micron). You want to exchange the buffer they are in, so you want to force all cells to a small pellet at the bottom of the tube using a centrifuge. You also don't want it to take more than 5 minutes. If the centrifuge radius is 10 cm, how fast do you have to spin? What is the acceleration in g?

(5) Relate the last section of this paper: Multiple Association States between Glycine Receptors and Gephyrin Identified by SPT Analysis "Properties of the equilibrium of GlyR traveling into and out of gephyrin clusters" with the ideas in Nelson 6.6.4. Make an argument that they calculated the potential energy in a cluster correctly (or incorrectly).

(6) Physics Grads only: Derive the Hagen-Poiseuille relation from the Navier-Stokes equation.