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From: Roy Jensen <royj@uvic.ca>
To: chemistry@ccl.net
Subject: SUMMARY: identifying single configuration systems
Date: Wed, 28 Aug 2002 22:51:57 -0700
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Thanks to those who responded. 

ORIGINAL QUESTION
**************************************
Is it possible to tell, a priori, if a system can be reasonably and
reliably represented by a single configuration method?

Are there any systems that generally fail? transition states,
partially filled orbitals, partially filled _degenerate_ orbitals,
etc.


RESPONSES
**************************************
From: Karl Irikura <karl.irikura@nist.gov>

Hi.  I think you are OK as long as there are no low-lying excited 
states of the same (computational) irreducible representation.


**************************************
From: Christoph van =?iso-8859-1?Q?W=FCllen?=
<Christoph.vanWullen@tu-berlin.de>

a priori is difficult, but you may run an MP2 or CISD calculation and
look at the occupation number of the natural orbitals. If they deviate
substantially from 2.0 and 0.0 (say, less than 1.9, more than 0.1)
this may be some indication for MR character.


**************************************
From: elewars <elewars@trentu.ca>

2002 Aug 23

Hello,

For a discussion of this see C. J. Cramer, "Essentials of
Computational Chemistry", Wiley, 2002, chapters 6 and 7.




From chemistry-request@server.ccl.net Wed Aug 28 14:59:47 2002
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From: "Tamas Gunda" <tamasgunda@tigris.klte.hu>
To: <chemistry@ccl.net>
Subject: chemory
Date: Wed, 28 Aug 2002 21:01:14 +0200
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Dear CCL'ers,

Not really CCL theme, rather education + fun  in chemistry. I made a
chemical memory card game called Chemory. The idea behind that I have quite
sad experiences about the students' knowledge of practical (organic)
chemistry - they know HOMO and LUMO, but fail when asking about xylene or
ketoglutaric acid. So I tried to weld a teaching aid  and some fun in the
form of a memory game. Don't grin, the chemistry in it is not so easy! It is
worth trying.
It has two versions: free/trial and registrated shareware. In the latter it
is possible to create new card template pages with ISIS/Draw.
Have a look to http://web.interware.hu/frenzy/chemory

Any feedback is welcomed, have fun,

Dr. Tamas E. Gunda
University of Debrecen
Research Group for Antibiotics
H-4010 Debrecen, POB 36
Hungary
tamasgunda@tigris.klte.hu
www.klte.hu/~gundat





From chemistry-request@server.ccl.net Wed Aug 28 15:10:13 2002
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From: Keith Taylor <K.Taylor@mdl.com>
To: Chemistry@ccl.net, CHMINF-L@LISTSERV.INDIANA.EDU, Eric_martin@chiron.com
Subject: RE: XML and combinatorial chemistry
Date: Wed, 28 Aug 2002 12:10:01 -0700
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MDL is developing an XML replacement for the SDfile and RDfile.  It will
accommodate all of MDL's structure representations, including generic
(Markush) structures, but it is not restricted to MDL structure formats.  If
you require more information please contact me directly at k.taylor@mdl.com.

-----Original Message-----
From: Stew Rubenstein [mailto:SRubenstein@cambridgesoft.com] 
Sent: Wednesday, August 28, 2002 7:18 AM
To: Chemistry@ccl.net; CHMINF-L@LISTSERV.INDIANA.EDU; Eric_martin@chiron.com
Subject: CCL:XML and combinatorial chemistry


ChemDraw, ChemOffice, and other CambridgeSoft tools support XML
representations and combinatorial chemistry.  This also includes our library
enumerator, plate inventory, BioAssay HTS, E-Notebook, and other
applications.  Please contact info@cambridgesoft.com to talk about this in
more detail.

-Stew Rubenstein
President and CTO
CambridgeSoft Corp.

> -----Original Message-----
> From: Shobe, Dave [mailto:dshobe@SUD-CHEMIEINC.COM]
> Sent: Wednesday, August 28, 2002 9:36 AM
> To: CHMINF-L@LISTSERV.INDIANA.EDU
> Subject: FW: XML and combinatorial chemistry
> 
> 
> Maybe someone in this community can answer this.  Please reply to Eric 
> Martin directly as he might not read CHMINF-L regularly.
> 
> --David Shobe
> Süd-Chemie Inc.
> phone (502) 634-7409
> fax     (502) 634-7724
> email  dshobe@sud-chemieinc.com
> 
> Don't bother flaming me: I'm behind a firewall.
> 
> 
> 
> -----Original Message-----
> From: Martin, Eric [mailto:Eric_Martin@chiron.com]
> Sent: Tuesday, August 27, 2002 7:51 PM
> To: chemistry@ccl.net
> Subject: CCL:XML and combinatorial chemistry
> 
> 
> Dear CCL,
> 
> Does CML or any other chemical XML application support combinatorial 
> chemistry? Specifically, I have in mind Markush or generic structures 
> with lists of R groups. Is specific support for Markush structures
> necessary or
> useful, or is there a way to do it with existing CML 
> elements? The CML FAQ
> (http://www.xml-cml.org/faq/index.html) notes that "Heteromers" e.g.
> modified proteins, are difficult to represent, which suggests 
> a Markush may
> be as well. Thanks in advance.
> 
> Regards, Eric
> ___________________
> 
> Eric Martin
> Chiron Corp, LSC 4.250
> 4560 Horton St.
> Emeryville, CA 94608
> (510)923-3306
> FAX 923-2010
> 
> 
> 
> CHMINF-L Archives (also to join or leave CHMINF-L, etc.) 
> http://listserv.indiana.edu/archives/chminf-l.html
> Search the CHMINF-L archives at: 
> http://listserv.indiana.edu/cgi-bin/wa?S1=chminf-l
> Sponsors of CHMINF-L: 
> http://www.indiana.edu/~cheminfo/chminf-l_support.html
> 


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From chemistry-request@server.ccl.net Thu Aug 29 04:57:43 2002
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Date: Thu, 29 Aug 2002 10:56:51 +0200
From: Vlad Cojocaru <Vlad.Cojocaru@mpi-bpc.mpg.de>
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Subject: an explanation for freq. in Gaussian 94
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Dear CCLers,
  I must say that is the first time I am doing vibrational analysis. So 
I have a question. Below is an output from a Gaussian job. As far as I 
know for the structure to be a minimum all the freq must be 
positive...while a single negative value means a transition state. 
Please correct me if the case.
   I also read on Gaussian documentation that they are looking at how 
close to 0 are the low freq
   Now, the thing is that I can not really identify everything in this 
file. On one hand there is a row of low freq. close to 0 and other with 
positive but much larger values. As calculation proceeds there are other 
freq. calculated.
   Could somebody guide me a bit on interpreting this output???
Thanks a lot in advance!!
Vlad
 
 Low frequencies ---   -1.2692    -.4883    -.0004     .0008     
.0009    1.9870
 Low frequencies ---   35.8128  138.7204  164.2523
 Harmonic frequencies (cm**-1), IR intensities (KM/Mole),
 Raman scattering activities (A**4/AMU), Raman depolarization ratios,
 reduced masses (AMU), force constants (mDyne/A) and normal coordinates:
                     1                      2                      3
                    ?A                     ?A                     ?A
 Frequencies --    35.8117               138.7204               164.2523
 Red. masses --     1.0475                 3.3764                 5.3678
 Frc consts  --      .0008                  .0383                  .0853
 IR Inten    --      .0139                 2.1122                 5.4316
 Raman Activ --      .1246                 1.7291                  .0713
 Depolar     --      .7372                  .7499                  .7106
 Atom AN      X      Y      Z        X      Y      Z        X      Y      Z
   1   6      .00    .00   -.04      .00    .00    .26      .00    
.00    .07
   2   7      .00    .00    .03      .00    .00   -.12      .00    .00   
-.13
   3   6      .00    .00    .00      .00    .00   -.10      .00    
.00    .19
   4   1      .00    .00    .01      .00    .00   -.11      .00    
.00    .39
   5   7      .00    .00   -.01      .00    .00   -.08      .00    
.00    .21
   6   6      .00    .00   -.01      .00    .00   -.06      .00    .00   
-.07
   7   6      .00    .00   -.02      .00    .00    .17      .00    .00   
-.08
   8   7      .00    .00   -.01      .00    .00    .20      .00    .00   
-.07
   9   6      .00    .00    .01      .00    .00    .00      .00    .00   
-.05
  10   7      .00    .00    .02      .00    .00   -.11      .00    .00   
-.28
  11   6      .00    .00    .01      .00    .00   -.11      .00    .00   
-.23
  12   7      .00    .00    .02      .00    .01   -.10     -.01   
-.01    .32
  13   1      .00    .00    .01      .00   -.03   -.01      .06    
.02    .51
  14   1      .00    .00    .03      .00   -.03   -.25      .06    
.02    .39
  15   1      .00    .00   -.03      .00    .00    .33      .00    .00   
-.05
  16   1      .44    .19   -.36      .23   -.16    .26      .09   
-.08    .09
  17   1     -.47   -.21   -.29     -.25    .17    .28     -.10    
.09    .09
  18   1      .03    .02    .54      .02   -.01    .54      .01   
-.01    .17
                     4                      5                      6
                    ?A                     ?A                     ?A
 Frequencies --   233.0433               280.7473               386.2434
..............  

-- 
Vlad Cojocaru 
Max Planck Institut for Biophysical Chemistry 
Deparment: 060 
Am Fassberg 11, 37077 Goettingen, Germany 
tel: ++49-551-201.1389 
e-mail: Vlad.Cojocaru@mpi-bpc.mpg.de  




From chemistry-request@server.ccl.net Thu Aug 29 06:32:05 2002
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Date: Thu, 29 Aug 2002 11:30:30 +0100
From: Laurence Cuffe <Laurence.Cuffe@ucd.ie>
Subject: Re: CCL:an explanation for freq. in Gaussian 94
In-reply-to: <3D6DE1D3.1090206@mpi-bpc.mpg.de>
To: Vlad Cojocaru <Vlad.Cojocaru@mpi-bpc.mpg.de>, chemistry@ccl.net
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Date sent:      	Thu, 29 Aug 2002 10:56:51 +0200
From:           	Vlad Cojocaru <Vlad.Cojocaru@mpi-bpc.mpg.de>
Subject:        	CCL:an explanation for freq. in Gaussian 94
To:             	CCL list <chemistry@ccl.net>

>Dear CCLers,
>  I must say that is the first time I am doing vibrational analysis. So 
>I have a question. Below is an output from a Gaussian job. As far as I 
>know for the structure to be a minimum all the freq must be 
>positive...while a single negative value means a transition state. 
>Please correct me if the case.
>   I also read on Gaussian documentation that they are looking at how 
>close to 0 are the low freq
>   Now, the thing is that I can not really identify everything in this 
>file. On one hand there is a row of low freq. close to 0 and other with 
>positive but much larger values. As calculation proceeds there are other 
>freq. calculated.
>   Could somebody guide me a bit on interpreting this output???
>Thanks a lot in advance!!
>Vlad
This output looks fine!  The really low frequencies -1.26 -.4883 etc
correspond to rotation and displacement modes and should be 
close to zero say < 3.0
these are and thus are nothing to worry about. All your proper 
frequencies (which are given with intensity information etc), are 
positive as they should be. 
A good source for more information is on the gaussian web site
in the paper by Joseph W. Ochterski at
http://www.gaussian.com/vib.htm
Hope this helps
Laurence Cuffe
> 
> Low frequencies ---   -1.2692    -.4883    -.0004     .0008     
>>.0009    1.9870
> Low frequencies ---   35.8128  138.7204  164.2523
> Harmonic frequencies (cm**-1), IR intensities (KM/Mole),
> Raman scattering activities (A**4/AMU), Raman depolarization ratios,
> reduced masses (AMU), force constants (mDyne/A) and normal coordinates:
>                     1                      2                      3
>                    ?A                     ?A                     ?A
> Frequencies --    35.8117               138.7204               164.2523
> Red. masses --     1.0475                 3.3764                 5.3678
> Frc consts  --      .0008                  .0383                  .0853
> IR Inten    --      .0139                 2.1122                 5.4316
> Raman Activ --      .1246                 1.7291                  .0713
> Depolar     --      .7372                  .7499                  .7106
> Atom AN      X      Y      Z        X      Y      Z        X      Y      Z
>   1   6      .00    .00   -.04      .00    .00    .26      .00    
>>.00    .07
>   2   7      .00    .00    .03      .00    .00   -.12      .00    .00   
>-.13
>   3   6      .00    .00    .00      .00    .00   -.10      .00    
>>.00    .19
>   4   1      .00    .00    .01      .00    .00   -.11      .00    
>>.00    .39
>   5   7      .00    .00   -.01      .00    .00   -.08      .00    
>>.00    .21
>   6   6      .00    .00   -.01      .00    .00   -.06      .00    .00   
>-.07
>   7   6      .00    .00   -.02      .00    .00    .17      .00    .00   
>-.08
>   8   7      .00    .00   -.01      .00    .00    .20      .00    .00   
>-.07
>   9   6      .00    .00    .01      .00    .00    .00      .00    .00   
>-.05
>  10   7      .00    .00    .02      .00    .00   -.11      .00    .00   
>-.28
>  11   6      .00    .00    .01      .00    .00   -.11      .00    .00   
>-.23
>  12   7      .00    .00    .02      .00    .01   -.10     -.01   
>-.01    .32
>  13   1      .00    .00    .01      .00   -.03   -.01      .06    
>>.02    .51
>  14   1      .00    .00    .03      .00   -.03   -.25      .06    
>>.02    .39
>  15   1      .00    .00   -.03      .00    .00    .33      .00    .00   
>-.05
>  16   1      .44    .19   -.36      .23   -.16    .26      .09   
>-.08    .09
>  17   1     -.47   -.21   -.29     -.25    .17    .28     -.10    
>>.09    .09
>  18   1      .03    .02    .54      .02   -.01    .54      .01   
>-.01    .17
>                     4                      5                      6
>                    ?A                     ?A                     ?A
> Frequencies --   233.0433               280.7473               386.2434
>>..............  
>
>-- 
>Vlad Cojocaru 
>Max Planck Institut for Biophysical Chemistry 
>Deparment: 060 
>Am Fassberg 11, 37077 Goettingen, Germany 
>tel: ++49-551-201.1389 
>e-mail: Vlad.Cojocaru@mpi-bpc.mpg.de  
>
>
>
>
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From chemistry-request@server.ccl.net Thu Aug 29 10:41:19 2002
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Hi all,

I was interested in using the AIMPAC program from Bader's research group
at McMaster University.

I downloaded the source and managed to compile a few of the modules
(cubev, gridv, proaimv) but all of the others (bubble, contor, grdvec,
profil, releif, and schuss) failed. Has anybody had any experience with
this compilation ? Anybody might have suggestions for compiler options
that might help ??

I am using Redhat 7.3.

Thanks all.


---------------------------------------
Dr. David Smith
Department of Chemistry
Ludwig Maximilians University
Butenandt-Str. 5-13, D-81377 Munich
Germany
Tel.: +49 (0)89 2180 7740
Fax.: +49 (0)89 2180 7738
e-mail: David.Smith@cup.uni-muenchen.de
---------------------------------------

From chemistry-request@server.ccl.net Thu Aug 29 12:33:37 2002
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Date: Thu, 29 Aug 2002 18:33:30 +0200
From: "Dr. Hatice Can" <hatice@ws0e.pc.chemie.tu-darmstadt.de>
To: chemistry@ccl.net
Subject: SUMMARY:CASSCF: StateAverage calculation
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Dear All,

I am summarising the responses those were sent to me for my following
question.The question:

I am doing CASSCF calculations on a cation. I am not
clear about why state average calculations is done. What for is it? Is it
really necessary? If you would sent any suggestions or literature name, I
will be glad.

Responses:

Tomasz Borowski <borowski@chemia.uj.edu.pl
Dear Hatice,
         State Averaged CASSCF calculations are usually done to get
         the wave functions and enegies of higher excited states. For
         example, it is normally possible to converge the single root
         calculations for the second or third state for given symmetry.
         However, it is almost always impossible to get higher roots
converged
         (due to root floping or other numerical problems). Thus, if you
are
         interested in, let say, five lowest states of a given symmetry
and
         you want to use CASSCF, then you have to resolve to state
averaged
         calculations, unless you are exceptionally lucky :)
         Kind regards,
         Tomek


timr@alkali.otago.ac.nz

Hi Hatice,
The CASSCF like an ordinary SCF calculation is an iterative
process,
         minimizing the energy until its change is within certain cutoffs.
If yo u are doing calculations on say the ground and one excited state you
         can choose to minimize the AVERAGE of the energies of the two
         states, this is known as state averaging. An alternative would be
to
         minimize the energy of the ground state, but this might be seen
as
         being "biased" towards the ground state.
         Hope this helps,
         Cheers, Tim


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Date: Thu, 29 Aug 2002 07:16:55 +0000 (GMT)
From: Szilveszter Juhos <szilva@ribotargets.com>
To: "Ibrahim M.Moustafa" <im17@st-andrews.ac.uk>
cc: chemistry@ccl.net
Subject: Re: CCL:Docking and binding affinity
In-Reply-To: <5.1.1.6.0.20020828182638.00a4f548@bute.st-andrews.ac.uk>
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On Wed, 28 Aug 2002, Ibrahim M.Moustafa wrote:
>     Is there any correlation between the binding constant, Ki, of the 
> ligand and the ability of the docking program to predict its interaction 
> with the binding site?

Well, short answer is no, the long answer is a long-long debate. In
general, scoring functions have nothing to do with solvation (though PMF
claims to inherently include solvation). Apart from solvation there are
other interactions that are not considered or poorly implemented, or are
different in a target family than in a the trainig/validation set. Other
pain is the entropy loss that you can only guess. The whole business is
even worse when it is about weak binders. I would say: scores are more
related to some probability that the ligand will bind to the target. With
clever pre/post-filtering you can have feasible results for virtual
screening, but its relation to dG is, well, debatable.

Cheers:
Szilva



From chemistry-request@server.ccl.net Thu Aug 29 10:46:36 2002
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Date: Thu, 29 Aug 2002 16:43:51 +0200 (CEST)
From: =?iso-8859-1?q?Michele=20Lunelli?= <efunit@yahoo.it>
Subject: MOPAC and spin density
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Hi all,
how is calculated in MOPAC the unpaired spin density
for odd electron systems, performing ROHF calculation
(i.e., using the ESR keyword)? I assume it is
calculated as described in Medrano et al., J. Phys. B,
26, 827-833 (1993). Is this correct?

Thanks in advance,
Michele Lunelli


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From chemistry-request@server.ccl.net Thu Aug 29 19:40:13 2002
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Date: Thu, 29 Aug 2002 19:40:11 -0400 (EDT)
From: rlw28@cornell.edu
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To: chemistry@ccl.net
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Subject: When is 14 less than 13?
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Hi all 

I have another strange problem.  

I'm running a PBC simulation in CHARMM.  It crashes and I get the 
following error message:

 ***** LEVEL  0 WARNING FROM <NBONDS> *****
      ***** CUTNB is larger than CUTIM: List incomplete.
      ******************************************
      BOMLEV (  0) IS REACHED - TERMINATING. WRNLEV IS -5

Yet, in my input file as shown below

DYNA  START VERLET  NSTEP 40000 TIMESTEP 0.001 IHBFRQ 10 -
IPRFRQ 1000 IHTFRQ 100 IEQFRQ 0 NTRFRQ 0 NSAVC 100 ISEED  314159 -
NSAVV 0 FIRSTT 100 FINALT 300 IUNCRD 21  IUNREAD 23 CDIE EPS 1.0 GROUP 
SWITCH -
IUNWRI 20 ISVFRQ 1000 INBFRQ 20 TEMINC 0.5 CUTNB 13.0 CTOFNB 12.0 CTONNB 
10.0 -
TWINDL -3.0 TWINDH 3.0 IASORS 1 IASVEL 1 ICHECW 1 VSWITCH IPRFRQ 1000 -
cutim 14.0 imgfrq 5

you can CLEARLT see that CUTNB (13.0) is LESS than CUTIM (14.0), and not 
LARGER.  What gives????

Richard

