Estimating Volumes of Amino Acids in nm^3

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Discussion Overview

The discussion revolves around estimating the volumes of various amino acids in nanometers cubed (nm3). Participants explore different methods for volume estimation, considering the geometric shapes and atomic structures of amino acids.

Discussion Character

  • Homework-related
  • Exploratory
  • Technical explanation

Main Points Raised

  • One participant suggests treating amino acids as spheres for volume estimation, using the formula V = 4/3*pi*r3.
  • Another participant challenges the assumption that amino acids can be treated as spheres, proposing that a combination of bond lengths and atomic radii may be more appropriate.
  • A different approach is proposed where the volumes of individual atoms are calculated and summed, acknowledging that this method may lack accuracy due to overlapping electron orbitals.
  • One participant expresses uncertainty about the best method and references a book that uses 3-D shapes for estimation, indicating a desire for a more refined approach.
  • Another participant notes that fitting amino acids into a spherical model may not be suitable for all, citing phenylalanine as an example due to its bulky and flat ring structure.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method for estimating volumes, with multiple competing views on how to approach the problem remaining evident throughout the discussion.

Contextual Notes

Participants acknowledge limitations in their proposed methods, such as the assumption of spherical shapes and the potential inaccuracies from overlapping electron orbitals. There is also a recognition that the estimations may not need to be exact.

Krazer101
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Homework Statement


Estimate the volumes of the various amino acids in units of nm^3


Homework Equations


V = 4/3*pi*r^3


The Attempt at a Solution


Is it alright to treat the amino acids as spheres? Using this I was thinking of measuring the distance, atomic radii and bond length, between end of R group and C terminus. Is this the right way to go or am I missing the problem completely?
 
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Assumption about spheres won't hold. But I think you are right that some combination of bond length and atomic radii is the way to go. My guess is that nobody expects exact answer, you are just expected to be creative and find a reasonable way of finding the answer that will be in a correct ballpark.
 
I'd just calculate the volume of the individual atoms and add them up
It won't be very accurate (because of overlapping electron orbitals) but I don't think its meant to be

hint:watch out for hydrogen
 
That was my first thought, I just decided to not post it :-p
 
I was thinking along the lines of that too, but I was just wondering if there was a better solution. The book solved many of the estimation problems by fitting the molecule, atom, etc into a 3-D shape, so I was thinking along those lines. Thank you for the help though, its much appreciated.
 
Fitting into 3-D shape is a good idea, but sphere won't work for all amino acids - for example phenylalanine has rather bulky and flat ring attached.
 

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