Re: [ccp4bb] Fine Phi Slicing

2017-07-13 Thread Dyda
I could be wrong here, but isn't the case that fine slicing is an option
with a CCD and a necessity on a PAD b/c of dead time and/or counter dynamic 
range 
issues?

(no current and/or former financial ties to any manufacturer)

Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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[ccp4bb] Molrep

2017-05-25 Thread Dyda
Dear All,

Does anyone know by any chance what to do when Molrep crashes with:

  Radius of gyration  :   27.85
  WARNING: Radius of integration  >42.40
  Radius of integration   :   42.40
  Resolution  :   29.824.00
 --- rfcoef for model ---
 --- rfcoef for Fobs ---
  NCS (from Self rotation Function): 1
  ERROR: in RFROT: RF overflow
  ERR: in CALC_SRF

This is with "anisothermal correction of Fobs" whatever that means.

It runs fine with "default scaling".

Data are very anisotropic, so "anisothermal correction of Fobs" sounded 
attractive.  

Thanks.

Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] Parallelization?

2017-02-09 Thread Dyda
Am I correct that OpenMP parallelized crystallographic software is in Fortran?

While I think there is OpenMP extensions for C and variants, but not so for 
python.
Is this correct?

Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] How to create electrostatic surface of modified DNA by APBS?

2014-04-24 Thread Dyda
Hi Xiaoming,

I would download pdb2pqr 1.8 from the apbs website and install it.
(linux)
It can handle nucleic acid, (3 letter code) .
After you installed it run it with
python /whereeveritis/pdb2pqr-1.8/pdb2pqr.py -h

it will print the options.

Hope this helps.

Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] Align linux version

2013-11-11 Thread Dyda
Please correct me if I'm wrong, but I think lsqman implements G. Cohen's 
operator
improvement in DP_improve. Assuming of course if that was the reason why someone
wanted to use align.

Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] CCP4 Update victim of own success

2013-04-11 Thread Dyda
Or nx, which works very well, although the server has to be installed at
the remote end and client on the local.

www.nomachine.com

Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] PNAS on fraud

2012-10-18 Thread Dyda
I think that the jump between fraud and other quality indicators is
a bit too steep for me. Poor quality indicators may suggest poor data
that the xtal was willing to diffract, a concept that to me is very
orthogonal to fraud.

Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] Fun Question - Is multiple isomorphous replacement an obsolete technique?

2012-06-06 Thread Dyda
I suspect that pure MIR (without anomalous) was always a fiction. I doubt that 
anyone has ever used it. Heavy atoms always give
an anomalous signal

Phil

I suspect that there was a time when the anomalous signal in data sets was 
fictional.
Before the invent of flash freezing, systematic errors due to decay and the need
of scaling together many derivative data sets collected on multiple crystals 
could render
weak anomalous signal useless. Therefore MIR was needed. Also, current 
hardware/software
produces much better reduced data, so weak signals can become useful.

Fred

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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] Fun Question - Is multiple isomorphous replacement an obsolete technique?

2012-06-06 Thread Dyda
Just for clarification: I didn't try to claim that there was no anomalous
signal, simply that in some cases it was difficult use it, because the
data weren't that great.

fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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Re: [ccp4bb] very informative - Trends in Data Fabrication

2012-04-03 Thread Dyda
I think that to review a paper containing a structure derived from
crystallographic data should indeed involve the referee having access
to coordinates and to the electron density. Without this access it
is not possible to judge the quality and very often even the 
soundness of statements in the paper.

I think the argument that this may give a competitive advantage
to the referee who him or herself maybe working on the same thing
should be mute, as I thought article refereeing was supposed to
be a confidential process. Breaching this would be a serious 
ethical violation. In my experience, before agreeing to review,
we see the abstract, I was always thought that I was supposed to
decline if there is a potential conflict with my own work. 
Perhaps naively, but I always assumed that everyone acts like this.

Unfortunately however, there is another serious issue.

After a very troubling experience with a paper I reviewed, I discussed
this issue with journal editors. What they said was that they already
have a hell of time to find people who agree to referee, by raising the
task level (asking refs to look at coords and density) they feared
that no one would agree.  Actually, perhaps many have  noticed the  
large number  of 5 liner referee reports saying really not much about a
full length research article. People simply don't have the time to
put the effort in. So I am not  sure how realistic is to ask even more,
for something that at some level, is pro bono work.

   
Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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[ccp4bb] pdb-l: Retraction of 12 Structures....

2009-12-12 Thread Dyda
On Sat, 12 Dec 2009 11:58:27 +0530 Dr. Anthony Addlagatta wrote:

Bernhard,

I would be worried about sending the structure factors and the coordinates 
along with
the manuscript.


I wonder why?

Cheers

   Fred
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Fred Dyda, Ph.D.   Phone:301-402-4496
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