1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Question about Cells and Cell Channels

  1. Mar 25, 2009 #1
    Imagine that it is possible to design cells of varying size. A cell is to be
    designed with a membrane that has a stable number of open channels. To
    this end, the number of channels must meet the following condition: the
    standard deviation of the number of open channels shall be no more than
    one percent of the expected number of open channels.

    (a) In terms of p and q, give the formula for M, where M is the
    minimum number of channels that the cell must have.

    (b) Assuming a spherical cell, give a formula for a, where a is the
    minimum radius that the cell must have to hold the required number
    of channels, at density D. (answer must be in terms of q, D and p,
    and constants only).

    (c) What is the minimum radius, a, that the cell must have to hold the
    required number of channels if the probability p is fixed at 0.05 and
    D is 200 channels per μm2?



    This is just review so if anyone could help me figure out this problem i would appreciate it. I know the answer to c is 8.69um, but unsure how to reach that result.
     
  2. jcsd
  3. Mar 25, 2009 #2

    Ygggdrasil

    User Avatar
    Science Advisor

    Read up on the Poisson distribution.
     
  4. Mar 25, 2009 #3
    thats not mentioned in our chapter at all (or in class) , could it be something else?

    some help with solving the problem would be helpful.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Question about Cells and Cell Channels
  1. Galvanic Cell Question (Replies: 0)

Loading...