From chemistry-request@server.ccl.net Wed Feb 26 12:52:05 2003
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Disposition-Notification-To: "Zottola, Mark" <MZottola@arl.army.mil>
Subject: Loops in Homology modeling
Date: Wed, 26 Feb 2003 12:52:36 -0500
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From: "Zottola, Mark" <MZottola@arl.army.mil>
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I am trying to model some proteins.  Unfortunately they have several
cysteines which are undoubtedly linked as disulfide bridges.  Are there
any good tomes, web pages, etc. for handling how to model these bridges.
The Wloop server seems intersting, but it seems to assume one already
understands how to model these loops.  Any pointers for this would be
rgeatly appreciated!

Best Regards,


Mark

************************************************
Dr. Mark A. Zottola
PET Director of Computational Chemistry and Materials
Army Research Laboratory
Aberdeen Proving Grounds
PB #134 939-I Beards Hill Road
Aberdeen, MD 21001
Voice: 410 278 7250  FAX: 410 297 9521
Email:  mzottola@arl.army.mil
 


From chemistry-request@server.ccl.net Wed Feb 26 15:17:59 2003
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To: chemistry@ccl.net
Cc: Vlad Cojocaru <Vlad.Cojocaru@mpi-bpc.mpg.de>, bashford@scripps.edu
Subject: Re: MEAD help
In-Reply-To: Your message of "Thu, 16 Jan 2003 12:27:53 +0100."
             <3E269739.8000103@mpi-bpc.mpg.de> 
Date: Wed, 26 Feb 2003 11:50:28 -0800
From: Don Bashford <bashford@scripps.edu>

>>>>> "Vlad" == Vlad Cojocaru <Vlad.Cojocaru@mpi-bpc.mpg.de> writes:

    Vlad> Dear CCLers, I am trying to use MEAD for the first
    Vlad> time. Since the documentation is very scarce I would like to
    Vlad> ask somebody that has already calculated electrostatic
    Vlad> potentials on macromocules using "potential" from MEAD suite
    Vlad> to give me some hints.  I am refering here to a simple basic
    Vlad> calculation. I tried to look at the examples in the
    Vlad> distribution but there is no examples for how to take a
    Vlad> structure from the pdb and calculate the potential and
    Vlad> visualizing it. All the examples deal with more advanced
    Vlad> stuff.  I tried "potential -epsin 1.0 -CoarseFieldOut file
    Vlad> molname" on a pqr file created with ambpdb (AMBER) and a ogm
    Vlad> file that looks like below:
    Vlad> 
    Vlad> ON_GEOM_CENT 41 1.0
    Vlad> ON_GEOM_CENT 41 0.25

    Vlad>    I got some warnings and errors that look like this:
    Vlad> 
    Vlad> WARNING: AtomChargeSet::get_cuberep: 162charges fall outside of the lattice,
    Vlad> WARNING: SAVanal_calc: vertex found with count = 2
    Vlad> WARNING: SAVanal_calc: vertex found with count = 2
    Vlad> WARNING: SAVanal_calc: vertex found with count = 1
    Vlad> WARNING: AtomChargeSet::get_cuberep: 2410charges fall outside of the 
    Vlad> WARINING from potential main program:
    Vlad> Could not open field point file, comp_test.fpt, for reading.  Exiting  without giving any potentials.

First the easy ones.  The warnings from SAVanal_calc are harmless, and
have to do with numerical degeneracies in the calculation of the
molecular surface.  If you really want to delve into it, see You and
Bashford (1995) JCC 16:743.  The complaint from main about the lack of
an .fpt file is a bug, but also essentially harmless.  Given that you
specified a course field file for output, the program should not
really require you to supply an .fpt file too, and in fact it doesn't
really, the course field file that you requested was generated. (At
least, it is when I try it!)  It's just the warning that's the bug,
and it's on my TO DO list.

The "charges fall outside of the lattice" is potentially more serious.
Taking the coord file you sent me, I see that it's x-coordinates span
about 54 Ang (spans in y and z are less).  The coarse grid that you
specified, 41 points at 1.0 Ang spacing can only span 40 Ang, so some
atoms are bound to fall outside, and that's the source of the first of
the two warnings you get.  In principle, charges outside the box can
be taken care of through the box boundary conditions, but this
requires (in principle) solving already the Poisson eqn for those
charges!  In practice MEAD sets the coarsest-grid boundary conditions
using a simple analytical assumption about the potential on that
boundary due to all charges (inside or outside).  but its validity
depends on that boundary being entirely in the exterior (solvent)
region and relatively far (say, 10 to 15 Ang) from any dielectric
discontinuities.  Bottom line: expand your coarse grid so it spans,
say 80 Ang, either be increasing the number of points or the spacing
between them.

The second "charges fall outside of the lattice" warning is from the
fine grid calculation.  This is harmless if the coarse grid
calculation is good, since the fine-grid boundary conditions are set
up by interpolation from the coarse grid, and therefore include a
reasonable Poisson solution for the influence of the out-of-fine-box
charges on the within-fine-box potential.  However, in your case,
there are two problems: first the coarse-grid calculation is in doubt;
second, because you take the coarse grid as your final program output,
you're not getting any information from the fine grid calculations.
The multiple grids of the .ogm file just represent nesting or
"focusing" as Gilson et al have called it, the fine grid does not feed
information back to the coarse grid as it would in a "multigrid"
calculation. 

-Don



From chemistry-request@server.ccl.net Thu Feb 27 12:12:04 2003
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Reply-To: <p.smith@student.umist.ac.uk>
From: "p smith" <p.smith@student.umist.ac.uk>
To: <chemistry@ccl.net>
Subject: infra-red stretching frequencies
Date: Thu, 27 Feb 2003 17:10:37 -0800
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Hi,
     What is the cheapest method of producing reliable IR stretching
frequencies computationally i.e. which represents the best compromise
between cost and accuracy. I know these calculations can be performed
semi-empirically but I am not sure how accurate the results are.
Cheers,
            Paul
p.smith@student.umist.ac.uk

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<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial;mso-ansi-language:EN-GB'>Hi,<o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial;mso-ansi-language:EN-GB'><span style=3D"mso-spacerun:
yes">&nbsp;&nbsp;&nbsp;&nbsp; </span>What is the cheapest method of =
producing
reliable IR stretching frequencies computationally i.e. which represents =
the
best compromise between cost and accuracy. I know these calculations can =
be
performed semi-empirically but I am not sure how accurate the results =
are.<o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial;mso-ansi-language:EN-GB'>Cheers,<o:p></o:p></span></font></span></p=
>

<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
color=3Dblack
face=3DArial><span =
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Arial;mso-ansi-language:EN-GB'><span style=3D"mso-spacerun:
yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>Paul<o:p></o:p></span></font></span></p>

<p class=3DMsoNormal><span class=3DEmailStyle15><font size=3D2 =
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style=3D'font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:
Arial;mso-ansi-language:EN-GB'>p.smith@student.umist.ac.uk<o:p></o:p></sp=
an></font></span></p>

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From chemistry-request@server.ccl.net Thu Feb 27 08:33:58 2003
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From: Ian Hovell <HOVELL@cetem.gov.br>
To: "'chemistry@ccl.net'" <chemistry@ccl.net>
Subject: Solvation method
Date: Thu, 27 Feb 2003 10:38:57 -0300
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I am planning on carrying out an AM1 analysis on the solvation of aromatic
compounds in nitrobenzene.
Which method would be best?
1. Using explicit solvent molecules in a cage around the solute in vacuo or
period box
2. Or using an implicit solvent and minimising the molecule with AMBER
before using AM1
The first method as I see it would take a lot longer to compute but I am not
sure yet about how to go about the second method.
Any help would be greatly welcome
Thanks
Ian

Ian Hovell - Ph.D. 
NUCLEO DE MODELAGEM MOLECULAR-NMM 
Centro de Tecnologia Mineral - CETEM 
Ministerio da Ciência e da Tecnologia- MCT 
Avenida Ipê, No 900 - Cidade Universitaria 
Ilha do Fundão Rio de Janeiro RJ Brasil 
CEP 21941-590 
tel 00 55 (xx) 3865 7344 ou 3865 - 7216 
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e-mail hovell@cetem.gov.br 



From chemistry-request@server.ccl.net Thu Feb 27 14:22:46 2003
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From: "Dr. Antonio Buljan" <abuljan@udec.cl>
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Dear all,

I want to perform  CASSCF calculation in some organic molecules and its
excited electronic states..

Which is the best packages for this?
Gaussian98?  Molcas?  Molpro?, etc.

Thanks in advances for the replies.

Antonio



Antonio Buljan-Hernandez
Assistant Professor.
Facultad de Ciencias Quimicas
Universidad de Concepcion.
Concepcion
CHILE



From chemistry-request@server.ccl.net Thu Feb 27 09:06:43 2003
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From: "Lin Bolin" <berlin_lin@hotmail.com>
To: CHEMISTRY@ccl.net
Subject: A problem about the LANL2DZ Polarization basis set
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Dear CCLers,

     We are trying to do some single-point calculations upon some molecules 

containing Pd with the DFT/ECP Polarization method.From the literature(
Chem.Phy.Lett.,208(1993),111) we got the value of f exponent,but therein 
no other orbital parameters,such as contraction coefficient and scale 
factor
,can be found.Does the contraction coefficient equal to 1.000 because 
the degree-of-contraction is 1.000? And does the scale factor equal to 
1.000
too?
    Can anyone here give me the answers to the above questions?
    Thanks a lot! 

           

******************************************* 
Mr. Bolin Lin
Department of Chemistry 
University of Science & Technology of China 
Hefei, Anhui 230026P. R. China 
Tel:86-551-3636861(Dorm) 
86-551-3606640(Office) 
Fax:86-551-3606689 
E-mail: bllin@mail.ustc.edu.cn  
******************************************* 




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From: "Villa, Jordi" <jvilla@imim.es>
To: "Zottola, Mark" <MZottola@arl.army.mil>
Cc: CHEMISTRY@ccl.net
Message-ID: <3E5DCB5E.9000704@imim.es>
Date: Thu, 27 Feb 2003 09:25:02 +0100
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Subject: Re: CCL:Loops in Homology modeling
References: <3DEB727CED850444BC67A65ECB26796A2EDB5C@ARLABML01.ds.arl.army.mil>
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try

http://www1.imim.es/~boliva/form-loop.html

Zottola, Mark wrote:
> I am trying to model some proteins.  Unfortunately they have several
> cysteines which are undoubtedly linked as disulfide bridges.  Are there
> any good tomes, web pages, etc. for handling how to model these bridges.
> The Wloop server seems intersting, but it seems to assume one already
> understands how to model these loops.  Any pointers for this would be
> rgeatly appreciated!
> 
> Best Regards,
> 
> 
> Mark
> 
> ************************************************
> Dr. Mark A. Zottola
> PET Director of Computational Chemistry and Materials
> Army Research Laboratory
> Aberdeen Proving Grounds
> PB #134 939-I Beards Hill Road
> Aberdeen, MD 21001
> Voice: 410 278 7250  FAX: 410 297 9521
> Email:  mzottola@arl.army.mil
>  
> 
> 
> -= This is automatically added to each message by mailing script =-
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> 
> 
> 


-- 
Jordi Villà i Freixa
Computational Structural Biology Laboratory
Research Group on Biomedical Informatics (GRIB) - IMIM/UPF

Passeig Marítim de la Barceloneta 37-49.  Tel: +34 93 224 0886
E-08003 Barcelona (Spain)                 Fax: +34 93 224 0875
e-mail: jvilla@imim.es http://www1.imim.es/~jvilla


From chemistry-request@server.ccl.net Thu Feb 27 21:08:25 2003
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Date: Thu, 27 Feb 2003 18:08:13 -0800 (PST)
From: "J. Zheng" <jzheng73@u.washington.edu>
To: chemistry@ccl.net
Subject: charge group information in psf file
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Dear CCLers:

  I have a basic question about protein structure file (psf) in CHARMM. In
psf file, the last section lists the charge group information. But I have
not figured out what relationship is among those atom index. It is very
straight forward to understand bonds, angle, dihedral, and improper atom
lists.

 here is a part of ALA residue PSF file.

      12 !NBOND: bonds
       2 1    3 1     4 1    7 5
       1 5   11 5     5 6    7 8
       7 9   7 10   11 13   11 12
.....
      3 0 !NGRP NST2
      0   2    0    6    1    0    10   2   0

 I don't undertand what those number stands for.

 I will appreciate for any hint or help.

 good day

 jie


From chemistry-request@server.ccl.net Thu Feb 27 17:48:55 2003
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Date: Thu, 27 Feb 2003 14:48:55 -0800 (PST)
From: Anna Krylov <krylov@almaak.usc.edu>
Subject: Electronic Structure Symposium in NYC
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An international symposium entitled "Making and breaking chemical
bonds in gas and condensed phases: Theory and Applications" will
be held at the 226th National ACS Meeting in New York during
September 7-11, 2003. The symposium will highlight recent
developments in electronic structure methodology targeting
the description of bond-breaking processes. The symposium
views bond-breaking in the broadest possible terms, ranging
> from small gas phase molecules that can be studied with the most
accurate quantum chemical methods to materials and biomaterials
that require innovative hybrid methods. Topics include
multi-reference and coupled-cluster methods, density
functional  theory, extensions to macro- and bio- systems,
as well as cutting-edge  applications to photochemical and
chemical reactions. The symposium will be a 4-day event
(eight half-day sessions), and will also include poster
sessions (as a subgroup of the Physical Chemistry poster
sessions). Contributed papers are welcomed, and poster
presentations are also strongly encouraged. The deadline
for submitting an abstract on OASYS (http://oasys.acs.org/oasys.htm)
is April 11.  Invited talks will be 40 minutes long, including
5-10 minutes for discussion. Contributed talks will be 20
minutes long, including 4 minutes for questions.

Conference website: http://www-rcf.usc.edu/~krylov/ACSNY/bbm2003.html

Organizers:
Prof. Anna I. Krylov (USC), http://www-rcf.usc.edu/~krylov
and
Prof. Mark S. Gordon (ISU/Ames NL), http://www.msg.ameslab.gov

Invited speakers:
Roi Baer (The Hebrew University of Jerusalem)
Kim Baldridge (UCSD, SDSC)
Rodney Bartlett (U. of Florida)
Maria Bartelt (Livermore NL)
Emily Carter (UCLA)
Galina Chaban (NASA-Ames)
Daniel Crawford (Virginia Tech)
Graham Fletcher (NASA-Ames)
Richard Friesner (Columbia)
Robert Harrison (Oak Ridge NL)
Martin Head-Gordon (UC Berkeley)
So Hirata (Pacific Northwest NL)
Steven Gwaltney (Mississippi State)
Joe Ivanic (NCI)
Jan Jensen (U. of Iowa)
Elfi Kraka (Goteborg University, Sweden)
Haruyuki Nakano (Tokyo U.)
Alexandr Nemukhin (Moscow State)
Marcel Nooijen (U. of Waterloo)
Massimo Olivucci (Universita di Siena)
Piotr Piecuch (Michigan State)
Jamie Rintelman (Iowa State/Ames NL)
Julia Rice (IBM)
Michael Schmidt (Iowa State/Ames NL)
Sason Shaik (The Hebrew University of Jerusalem)
Yihan Shao (UC Berkeley/Q-Chem)
David Sherrill (Georgia Tech)
Lyudmila Slipchenko (USC)
Xueyu Song (Iowa State)
John  Stanton (Texas, Austin)
Theresa Windus (Pacific Northwest NL)
Weitao Yang (Duke U.)

Sponsors: IBM, Petroleum Research Fund, Q-Chem

	"Every attempt to employ mathematical methods in the study
	of chemical questions must be considered profoundly
	irrational and contrary to the spirit of chemistry.  If
	mathematical analysis should ever hold a prominent place
	in chemistry - an aberration which is happily almost
	impossible - it would occasion a rapid and widespread
	degeneration of that science."
					A. Comte (1830)








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Reply-To: "DrHuang.com" <DrHuang@drhuang.com>
From: "DrHuang.com" <drhuang@drhuang.com>
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Subject: Review of Polar 4.5
Date: Fri, 28 Feb 2003 13:12:52 +1100
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Journal of Physical Science Educational Review, 2002, Nov., 3(2), 26-27, =
reviewed "This program is excellent." at =
http://dbweb.liv.ac.uk/ltsnpsc/swrevs/5polar.htm.=20

New version 5.1 add features of color, checking, etc that is lack in =
this review.

***********************************************************
* Dr Weiguang Huang,    BS, MS, PhD, MACS      *
* 124 Eastern Ave, Kingsford, Sydney, NSW 2032, Australia *
* Phone: 0413 008 019       *
* Fax: (61 2) 96620516       *
* email: DrHuang@DrHuang.com, Huang@racePrediction.com      *
* FREE trial Investment software from        *
* http://www.DrHuang.com, www.DoctorHuang.com      *
* 20001-2002 Golden Web Award winner     *
***********************************************************


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<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>Journal of Physical Science Educational Review, 2002, Nov., 3(2), =
26-27,=20
reviewed "This program is excellent." at <A=20
href=3D"http://dbweb.liv.ac.uk/ltsnpsc/swrevs/5polar.htm">http://dbweb.li=
v.ac.uk/ltsnpsc/swrevs/5polar.htm</A>.=20
</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>New version 5.1 add features of color, =
checking,=20
etc that is lack in this review.</FONT></DIV>
<DIV><FONT face=3DArial=20
size=3D2><BR>***********************************************************<=
BR>* Dr=20
Weiguang Huang,&nbsp; &nbsp;&nbsp;BS, MS, PhD, MACS&nbsp;&nbsp; =
&nbsp;&nbsp;=20
*<BR>* 124 Eastern Ave, Kingsford, Sydney, NSW 2032, Australia *<BR>* =
Phone:=20
0413 008 019&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *<BR>* Fax: (61 2)=20
96620516&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; *<BR>* email: <A=20
href=3D"mailto:DrHuang@DrHuang.com">DrHuang@DrHuang.com</A>, <A=20
href=3D"mailto:Huang@racePrediction.com">Huang@racePrediction.com</A> =
&nbsp;=20
&nbsp;&nbsp; *<BR>* FREE trial Investment software =
from&nbsp;&nbsp;&nbsp;=20
&nbsp;&nbsp;&nbsp; *<BR>* <A=20
href=3D"http://www.DrHuang.com">http://www.DrHuang.com</A>, <A=20
href=3D"http://www.DoctorHuang.com">www.DoctorHuang.com</A>&nbsp;&nbsp;=20
&nbsp;&nbsp; *<BR>* 20001-2002 Golden Web Award =
winner&nbsp;&nbsp;&nbsp;&nbsp;=20
*<BR>***********************************************************<BR></FON=
T></DIV></BODY></HTML>

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