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Does muscle have the least protein content?

  1. Nov 16, 2006 #1
    I am in the middle of a physics experiment that has recently crossed over into biology...the details are not important, but what i found was that a certain property changed in this order as the following substances were scanned:

    1. muscle
    2. liver
    3. fat
    4. heart
    5. cartilage
    6. bone marrow

    is there any biological or physical property (density, protein content, etc??) that would change in that order? e.g. does muscle have the least protein content and bone marrow the most? or vice versa? or is it maybe the size of the molecules that vary in that order?
  2. jcsd
  3. Nov 16, 2006 #2


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    the details are important what are you measuring en what is your sample preparation┬┐
  4. Nov 16, 2006 #3
    Its an experiment on pulsed nuclear magnetic resonance spectroscopy and the factor that increases (roughly linearly for some reason) with muscle, liver......marrow is the spin spin relaxation time T2

    so I placed small samples of each type of tissue, scanned them, found an average relaxation time and standard error for each tissue, and plotted them....

    now my question is, why does T2 increase in that fashion for the biological samples...what is it about liver for instance that causes a higher T2 than muscle
  5. Nov 16, 2006 #4
    Fat has a very efficient energy exchange and therefore it has a relatively short T2.
    Water is less efficient than fat in the exchange of energy, and therefore it has a long T2 time
    So, I would look at ratio of water to fat in these various tissues. I note that your "fatty tissue" has shorter T2 than your bone marrow which should have relatively more water. Just a thought--good luck.
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