Re: [ccp4bb] poll: cutoff for "high resolution"

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Subject: Re: poll: cutoff for "high resolution"
From: Sue Roberts suer {- at -} EMAIL {- dot -} ARIZONA {- dot -} EDU
Date: 2008-05-15

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Subject: Re: poll: cutoff for "high resolution"
From: Ed Pozharski epozh001 {- at -} UMARYLAND {- dot -} EDU
Date: 2008-05-15

Subject: Re: poll: cutoff for "high resolution"
From: Bernhard Rupp bernhardrupp {- at -} SBCGLOBAL {- dot -} NET
Date: 2008-05-15

Optical reconstructions are intensity based.
Xtallographic FT are amplitude based.
The theoretical value for xray is about 0.9*dmin.
Reading:
Stenkamp, R.E. and L.H. Jensen. 1984 Resolution revisited. Acta Cryst., A40,
251-254.
and the SFCHECK paper for other considerations
Vaguine AA, Richelle J, & Wodak SJ (1999) SFCHECK: a unified set of
procedures for evaluating the quality of macromolecular structure-factor
data and their agreement with the atomic model. Acta Crystallogr. D55,
191-20.

BR

-----Original Message-----
From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of
William Scott
Sent: Thursday, May 15, 2008 10:56 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] poll: cutoff for "high resolution"

Actually, if you want to feel really good, I learned (in the context of
optics) that you can resolve two points separated by a distance x with a
diffraction limit of x/0.7, so this means you can start to see carbon -
carbon atomicity at 2.2 Å.
On May 15, 2008, at 10:12 AM, Gloria Borgstahl wrote:

> To me, it seems legal to use the words "atomic resolution" once we are
> within the carbon-carbon bond length. So I'm agreeing with Dr.
> Scott.
> Otherwise I'll never get to use the words...
>
> **********************************************************************
> ********
> Gloria Borgstahl
> Eppley Institute for Cancer Research and Allied Diseases
> 987696 Nebraska Medical Center
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> Interests: ThimbleTack, skateboarding, RAGBRAI, and rollerskating
> **********************************************************************
> ********
>
>
>
> William Scott Sent by: CCP4 bulletin
> board
> 05/15/2008 12:09 PM
> Please respond to
> William Scott
>
>
> To
> CCP4BB@JISCMAIL.AC.UK
> cc
>
> Subject
> Re: [ccp4bb] poll: cutoff for "high resolution"
>
>
>
>
>
>
> 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.

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CCP4bb <-- 2008 <-- May 2008 <-- 15 May 2008

Previous message:
Subject: Re: poll: cutoff for "high resolution"
From: Sue Roberts suer {- at -} EMAIL {- dot -} ARIZONA {- dot -} EDU
Date: 2008-05-15

Next message:
Subject: Re: poll: cutoff for "high resolution"
From: Ed Pozharski epozh001 {- at -} UMARYLAND {- dot -} EDU
Date: 2008-05-15