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From: Knut Teigen <knut.teigen@pki.uib.no>
Subject: isoelectric point calculation
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Dear CCL'ers

Could somebody please tell me if there is a code or software available that 
can calculate the isoelectric point of a folded protein?

I would like to calculate the isoelectric point based on the 3D structure, 
and not based purely on the primary sequence.

Kind regards
Knut Teigen
Ph.D. student
Faculty of Medicine
Dept. of Biochemistry
University of Bergen, Norway
knut.teigen@pki.uib.no


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Hi there.

I was wondering if anyone know if I can use TINKER for minimize
coordinates and cell parameters of cristal structure with rigid
molecules in the unit cell.
Actually, I use Tinker with optrigid but I can optimize the cell
parmeters.

Many thanks for your help

Sincerely
Sylvain


From chemistry-request@server.ccl.net Fri Jun 21 09:54:35 2002
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HI

I'm having a weird problem with my Athlon. It was running fine doing DFT
calculations for organometallic compounds for the last 3 months.
In the last 3 weeks it crashes constantly, actually, every day.

I though that could be a hacker, and dinsconnect the network cable, butthe
problem remains.
I also checked for the size of the files, and they don look to be bigger
than 2GB ( I'm doing direct calculations ).

Any one has ever had this problem?? Or has a tip for the solution??
I will appreciate any help

Thank you

 ______________________________________________________________________
|                                                                      |
|Antonio Luiz Oliveira de Noronha   -   noronha@dedalus.lcc.ufmg.br    |
|EEPEMM - Eletronic Spectra and Electromagnetic Properties of Molecules|
|Theoretical Physical Chemistry                                        |
|Chemistry Departament - DQ                                            |
|UFMG - Federal University of Minas Gerais - Brazil                    |
|Av. Antonio Carlos, 6627 - Campus Pampulha                            |
|CEP 31270-901 - Belo Horizonte - MG - Brazil                          |
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From chemistry-request@server.ccl.net Fri Jun 21 03:47:07 2002
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From: Wai-To Chan <chan@curl.gkcl.yorku.ca>
Message-Id: <200206210747.g5L7l1U05723@curl.gkcl.yorku.ca>
Subject: wavefunction stability issues
To: chemistry@ccl.net
Date: Fri, 21 Jun 2002 03:46:59 -0400 (EDT)
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>Date: Wed, 29 May 2002 18:29:02 +0200
>From: Patrick Bultinck <Patrick.Bultinck@rug.ac.be>

>Dear all,

>Can anybody refer me to a good reference on the different sources of wave
>function instability ? Especially as on how to judge whether a certain post
>SCF calculation will help. Also, it is sometimes stated that wave function
>instability would indicate the necessity of electron correlation. At this
>day and age, only single reference (Hartree-Fock) dynamical electron
>correlation techniques can be used for the larger molecules I am looking
>at. What good is MP2, CC etc. when the reference is not appropriate ?

  I don't think there is a clear-cut answer to your question. 
Switching to a reference UHF wavefunction in the region 
of a PES for a closed-shell system where the RHF wave is unstable towards
spin-symmetry breaking sounds theoretically more rigourous. 
To my knowledge it is not known whether a UHF-based MPn or CCSD(T) method 
would always give more accurate result than if you stick to the unstable
RHF wavefunction. At least from my limited experience
if the degree of distortion of the structure calcluated and its
degree of wavefunction instability are not too high it 
may be prudent to stick with RMP2 or RDFT for 
transition structure optimization to avoid spin 
contamination of the stable UHF wavefunction. 

These two references may be helpful to you:

"Evaluation of S^2 for correlated wavefunctions...." 
Chen and Schlegel, J chem phys, vol 101 (1994) 5957. 

"Spin-contamination of coupled-cluster wave functions"
A Krylov, J chem phys, vol 113 (2000) 6052. 

  The Schlegel paper compares the performances of variuos R and U method 
with full CI on potential curve calculations. It also reports 
the degree of spin-contamination of the correlated wavefunctions that 
allows you to judge which method can best handle an unstable reference
wavefunction. 

>Really, for a good result a technique like mrci would be very interesting,
>but for some systems (and computer resources), even a large CAS+PT is
>impossible. So how to handle this ? Any references ?

    At present analytical gradient is available in neither method. 
It is safe to say that their applications to calculation of 
ground state as an alternate to single-reference method will be 
limited for some time.  You may check out this paper for an example of 
possibly an unusually large-scale CASMP2 calculations on a system 
presumably not amenable to single-reference method. 
I would be delighted to see some comparisons between
CASMP2 and the single-reference BD(T) method in this subject. 

"UDFT and MSCF description of the photochemical Bergman cyclization of enediynes"
Clark, Davidson and Zaleski
JACS, vol 123 (2001) 2650. 


>As a side question: would anybody have any idea what percentage of post-scf
>calculations being done has ever had the stability of its HF reference
>checked ?
 
  Perhaps the real question is how often stability of HF reference is an issue
in studies involving post-scf calculations. In principle 
instability of RHF wavefunction could be solved by using a MCSCF approach
which in practice is not straightforward to apply. My view is
there is not much one can do beyond standard methods in dealing with 
wavefunction instability in the intermediate bond-breaking region. 
Instability of UHF wavefunctions of radicals towards spatial symmetry breaking is 
hardly an overlooked issue. You may find this example of interest

"A detailed study on the symmetry breaking and its effect 
on the potential surface of NO3"
Eisfeld and Morokuma
J chem phys, vol 113 (2000) 5587. 

  This one concerns DFT but is still relevant

"On the performance of density functional theory for
symmetry-breaking problems"
Sherill, Lee and Head-Gordon
Chem phys lett, vol 302 (1999) 425.

    One area where some people may overlook the stability issue concerns
singlet diradicals. This paper convers two previous studies where
use of unstable RDFT wavefunctions lead to erroneous observations. 

J phys chem A, vol 104 (2000) 1748
Grafenstein, Hjerpe, Kraka and Cremer

Wai-To Chan

>Thanks,

>Patrick Bultinck
>Ghent University
>Belgium



From chemistry-request@server.ccl.net Fri Jun 21 08:58:09 2002
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Message-ID: <15635.8926.310772.589229@kohn.nd.rl.ac.uk>
Date: Fri, 21 Jun 2002 13:58:06 +0100
To: chemistry@ccl.net
Subject:  Brenner potential code
X-Mailer: VM 7.07-rfhacked under 21.4 (patch 8) "Honest Recruiter" XEmacs Lucid
From: "Keith Refson" <kr@isise.rl.ac.uk>

I am looking for any public domain/open source code which can handle
the Brenner potential.  I found some reference to various code at 

http://www.rahul.net/pcm/brenner/

and

http://www2.zyvex.com/DCAD/Software.html

but neither of these sites appear to exist -- or at least be reachable
> from here.

Does anyone have a pointer, or a copy of the released code?

Keith Refson
-- 
Dr Keith Refson, 
Building R3
Rutherford Appleton Laboratory
Chilton
Didcot
Oxfordshire OX11 0QX
T: 01235 446652		K.Refson@
F: 01235 445720		@rl.ac.uk



From chemistry-request@server.ccl.net Fri Jun 21 10:12:22 2002
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From: Richard Gillilan <reg8@cornell.edu>
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To: Sylvain BEAUCAMP <beaucams@ripault.cea.fr>
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Subject: Re: CCL:help about TINKER for optimize rigid molecules in cristal cell
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I don't know if TINKER is able to do this, but
Xplor (CNS) can define rigid bodies and minimize
in Euler coordinates and has some abilities to impose
some symmetry constraints. As you know, you cannot simply
apply periodic boundary conditions since that would
fix the cell. You need to allow the unit cell vectors
in the periodic boundaries to vary. I have seen a 
paper that does this for dynamics (sorry, the reference
is at home ... I will try to post it 
later). It was suggested to me by someone earlier on
this list so you can also find it by searching the
archives. I don't know of any available program 
able to do this, but groups that simulate crystallization
must deal with the issue. 

BTW, crystallographic water molecules and counter ions can
be quite important in the case, if they are well resolved in the
structures. 

Richard Gillilan
MacCHESS
Cornell

From chemistry-request@server.ccl.net Fri Jun 21 11:26:22 2002
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From: "T. Daniel Crawford" <crawdad@vt.edu>
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To: Wai-To Chan <chan@curl.gkcl.yorku.ca>
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Subject: Re: CCL:wavefunction stability issues
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We have done a number of studies directly addressing the question as to how
post-HF methods perform when reference functions are unstable.  My experience
with spatial symmetry breaking is that a strong instability in the MO's
(i.e., a negative eigenvalue in the MO Hessian/stability matrix) is often
not a problem (apart from practical difficulties such as finite-difference
vibrational analyses).  The difficult cases occur when the MO Hessian is
nearly singular, that is, when one of its eigenvalues is close to zero,
regardless of sign.  In such cases, even high-level coupled cluster cases
can give anomolous results --- e.g., vibrational frequencies > 5000 cm-1.

Please see:

@Article{
  author =       "T. D. Crawford and J. F. Stanton and W. D. Allen and
                  H. F. Schaefer",
  title =        "Hartree-Fock orbital instability envelopes in highly
                  correlated single-reference wavefunctions",
  journal =      JCP,
  year =         1997,
  volume =       107,
  number =       24,
  pages =        10626
}

for a detailed theoretical analysis of this.  Also, for a difficult singlet
diradical case:

@Article{
  author =       "T. D. Crawford and E. Kraka and J.F. Stanton and D.
                  Cremer,"
  title =        "Problematic p-Benzyne: Orbital Instabilities, Biradical
                  Character, and Symmetry Breaking",
  journal =      JCP,
  year =         2001,
  volume =       114,
  pages =        "10638-10650"
}

In this above, we applied a wide range of reference functions, including
Brueckner, GVB, RHF, and UHF, to the p-benzyne diradical.

-Daniel

-- 
T. Daniel Crawford                           Department of Chemistry
crawdad@vt.edu                                    Virginia Tech
www.chem.vt.edu/chem-dept/crawford    Voice: 540-231-7760  FAX: 540-231-3255
                            --------------------
 PGP Public Key at: http://www.chem.vt.edu/chem-dept/crawford/publickey.txt


From chemistry-request@server.ccl.net Fri Jun 21 10:30:59 2002
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From: "sdecker" <sdecker@uwo.ca>
To: <chemistry@ccl.net>
Subject: Graphics Programs for Visualizing ADF MOs
Date: Fri, 21 Jun 2002 10:30:31 -0400
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Hello All,

    I am relatively new to the ADF DFT package and I was wondering if =
someone could point me to a good molecular graphics viewer for ADF jobs. =
 In particular I am interested in viewing molecular structures, =
Molecular Orbitals and animating vibrational frequencies with it. =20

    Thanks in advance.

    Sincerely,

    Stephen A. Decker

_________________________________________________

 Dr. Stephen A. Decker, Ph.D.
 NSERC Postdoctoral Fellow

 Department of Chemistry =20
 University of Western Ontario
 London, Ontario,  Canada
 N6A 5B7

 phone: (519)-661-2111 ext. 86353         =20
 fax:      (519)-661-3022
 email:  sdecker@uwo.ca
_________________________________________________


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2713.1100" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hello All,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; I am relatively new =
to the ADF=20
DFT package and I was wondering if someone could point me to a good =
molecular=20
graphics viewer for ADF jobs.&nbsp; In particular I am interested in =
viewing=20
molecular structures, Molecular Orbitals and animating vibrational =
frequencies=20
with it.&nbsp; </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; Thanks in =
advance.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; =
Sincerely,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;&nbsp;&nbsp; Stephen A. =
Decker</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial=20
size=3D2>_________________________________________________</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;Dr. Stephen A. Decker, =
Ph.D.<BR>&nbsp;NSERC=20
Postdoctoral Fellow</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;Department of Chemistry&nbsp;=20
<BR>&nbsp;University of Western Ontario<BR>&nbsp;London, Ontario,&nbsp;=20
Canada<BR>&nbsp;N6A 5B7</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;phone: (519)-661-2111 ext.=20
86353&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
<BR>&nbsp;fax:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
(519)-661-3022<BR>&nbsp;email:&nbsp; <A=20
href=3D"mailto:sdecker@uwo.ca">sdecker@uwo.ca</A><BR>____________________=
_____________________________<BR></FONT></DIV></BODY></HTML>

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From chemistry-request@server.ccl.net Fri Jun 21 11:19:43 2002
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Date: Fri, 21 Jun 2002 17:19:32 +0200 (CEST)
From: Eugen Leitl <eugen@leitl.org>
To: Keith Refson <kr@isise.rl.ac.uk>
cc: <chemistry@ccl.net>
Subject: Re: CCL:Brenner potential code
In-Reply-To: <15635.8926.310772.589229@kohn.nd.rl.ac.uk>
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On Fri, 21 Jun 2002, Keith Refson wrote:

> I am looking for any public domain/open source code which can handle
> the Brenner potential.  I found some reference to various code at 

Try http://www.fungible.com/fungimol/
 
-- Eugen

P.S. sorry for public answer, but your blackhole rules are overzealous:

<kr@isise.rl.ac.uk>:
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Giving up on 130.246.135.154.




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Errors-To: <morales@combichemlab.com>
From: Guillermo A Morales <morales@combichemlab.com>
To: CHEMISTRY@ccl.net
Reply-To: morales@combichemlab.com
Subject: Computational solutions for the PC to prepare molecules for docking experiments.
Date: Fri, 21 Jun 2002 12:37:49 -0700 (PST)
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Dear all,

I am trying to prepare compounds for docking
experiments and for this I use PC-available programs
(Windows and Linux).

When molecular structures are created or modified
(i.e. ligand extracted from an pdb file) their
coordinates are set relative to their own internal
x,y,z points of origin.

My problem is that the coordinates of the molecules
need to be modified so the molecules are positioned at
specific places relatively to the protein of interest
for docking.

Do you know how of any program for the PC (Windows or
Linux) that allows the manipulation of molecular
structures so they can be re-oriented and saved (with
their internal cooridantes reflecting the new 3-D
position and orientation) for their use in docking
experiments?

I'll summarize the answers I receive and post them
here later.

Thank you very much for your help in advance.

Sincerely,

Guillermo.
-- 
Guillermo A. Morales
Email: morales@combichemlab.com
Website: http://www.combichemlab.com
Member of Combi-Web Consortium: 
http://www.combi-web.com


From chemistry-request@server.ccl.net Fri Jun 21 11:49:29 2002
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From: Alexander.Hillisch@Jenapharm.de
Date: Fri, 21 Jun 2002 17:49:18 +0200
Subject: Antwort: CCL:Graphics Programs for Visualizing ADF MOs
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Hi Stephen,

have a look at MOLEKEL (http://www.cscs.ch/molekel/). This program is
ideally suited for the type of applications you are thinking about - and it
is freely available.

Best regards,

Alexander

------------------------------------------------------------------------------

Dr. Alexander Hillisch
EnTec GmbH
Structural Bioinformatics and Drug Design
Adolf-Reichwein-Str. 20        Phone:  +49-3641-65-8430
D-07745 Jena,                        Mobile: +49-170-7521496
GERMANY                              Fax:       +49-3641-65-8436
e-Mail: alexander.hillisch@jenapharm.de
URL: http://www.entec-jena.de



                                                                                                        
                    "sdecker"                                                                           
                    <sdecker@uwo.ca>                                                                    
                    Gesendet von:                                                                       
                    "Computational                                                                      
                    Chemistry List"                                                                     
                    <chemistry-reques An:                                                               
                    t@ccl.net>                    <chemistry@ccl.net>                                   
                                                                                                        
                                                                                                        
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                                      Thema:                                                            
                                                  CCL:Graphics Programs for Visualizing ADF MOs         
                                                                                                        
                                                                                                        



Hello All,

    I am relatively new to the ADF DFT package and I was wondering if
someone could point me to a good molecular graphics viewer for ADF jobs.
In particular I am interested in viewing molecular structures, Molecular
Orbitals and animating vibrational frequencies with it.

    Thanks in advance.

    Sincerely,

    Stephen A. Decker

 _________________________________________________

 Dr. Stephen A. Decker, Ph.D.
 NSERC Postdoctoral Fellow

 Department of Chemistry
 University of Western Ontario
 London, Ontario,  Canada
 N6A 5B7

  phone: (519)-661-2111 ext. 86353
 fax:      (519)-661-3022
 email:   sdecker@uwo.ca
(See attached file: C.htm)


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From chemistry-request@server.ccl.net Fri Jun 21 23:51:11 2002
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From: "zjcao" <zjcao@jingxian.xmu.edu.cn>
To: <chemistry@ccl.net>
Subject: The calculation of solvation free energy
Date: Sat, 22 Jun 2002 11:50:11 +0800
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Dear all,
 
The free energy of solvation is the key parameter in describing solvation.
Would you please to teach me how to calculate it for several solvation models, e.g. Onsager model, PCM model and discrete-continuum model? References are invited too.

Thanks in advance!

ZJ Cao


