The electrons on the hydrogens won't be centered about the proton
nucleus, so if you want to resolve that as anything more than a bump,
you will need a lot better than 1 Å (or neutrons). But in fairness
the original question asked what you can call "high" resolution, not
what you can call atomic resolution. I think anything better than ~3
Å should allow unambiguous definition of nucleotide and amino acid
positions.
On May 15, 2008, at 11:28 AM, Ed Pozharski wrote:
> Of course. However, C=0 bond is ~1.2A, and bonds made by those pesky
> hydrogens are ~1A. And I would think (it is semantics again) that to
> reach atomic resolution you have to resolve all atoms, otherwise
>
> "All atoms are equal, but some (non-hydrogens) are more equal than
> others."
>
> Cheers,
>
> Ed.
>
> On Thu, 2008-05-15 at 10:08 -0700, William Scott wrote:
>> On May 15, 2008, at 10:01 AM, Ed Pozharski wrote:
>>
>>> 1.2A (not surprisingly since this is about the length of covalent
>>> bond).
>>
>> A carbon-carbon single bond is about 1.55 Å.
> --
> Edwin Pozharski, PhD, Assistant Professor
> University of Maryland, Baltimore
> ----------------------------------------------
> When the Way is forgotten duty and justice appear;
> Then knowledge and wisdom are born along with hypocrisy.
> When harmonious relationships dissolve then respect and devotion
> arise;
> When a nation falls to chaos then loyalty and patriotism are born.
> ------------------------------ / Lao Tse /
>
>
>
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