Re: [ccp4bb] on the resoution of crystal

2017-02-06 Thread Joel Sussman
6-Feb-2017 Dear Pavel & Tim, For a very good visualization & description of “Resolution”, please see the Proteopedia page created primarily by Eric Martz at: http://www.proteopedia.org/w/Resolution it includes a pointer to James Holton’s movie showing an Electron Density Map vs. Resolution (with m

Re: [ccp4bb] on the resoution of crystal

2017-02-05 Thread Tim Gruene
Dear Pavel, I believe words have a meaning, but they are not defined. This may make languages a little more demanding than mathematics, since you have to deal with a variety of a few hundred thousand to millions, depending how popular the language in question is, but personally I enjoy the chal

Re: [ccp4bb] on the resoution of crystal

2017-02-05 Thread Pavel Afonine
Hi Tim, hi Natesh, one expression is mathematically, the other one is technically 'more > correct'. > I favour the terms poor and good resolution to avoid confusion, or > explicitly > list the values. just out of curiosity.. what's your definition of 'poor' and 'good' resolutions? I suspect ther

Re: [ccp4bb] on the resoution of crystal

2017-02-05 Thread Natesh Ramanathan
Dear John, In protein crystallography, the ranges customarily applied to resolution are: Low resolution --> worse than 2.7 A Medium resolution --> better than 2.7 A but worse than 1.8 A High resolution --> better than 1.8 Aand worse than 1.2 A Atom

Re: [ccp4bb] on the resoution of crystal

2017-02-05 Thread Tim Gruene
Dear John, one expression is mathematically, the other one is technically 'more correct'. I favour the terms poor and good resolution to avoid confusion, or explicitly list the values. Best, Tim On Sunday, February 5, 2017 12:09:11 PM CET wrote: > Dear All, > For one protein crystal, its res

Re: [ccp4bb] on the resoution of crystal

2017-02-05 Thread Dale Tronrud
It is confusing, but "high" is meant to indicate the quality of the final electron density map based on the data. Your 1.8 A data set will give the better map, and is the high resolution data set. Dale Tronrud On 2/5/2017 4:09 AM, wrote: > Dear All, > > For one protein crystal, its resoluti

[ccp4bb] on the resoution of crystal

2017-02-05 Thread
Dear All, For one protein crystal, its resolution was 1.8 A. For another crystal for the same protein,  its resolution was 3.8 A. In literature, do we call the 1.8 A crystal as the high resolution crystal (because of quality), or do we call the 3.8 A crystal as the high resolution crystal (beca