From s.hogg@ic.ac.uk  Wed Aug 13 07:17:22 1997
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Date: Wed, 13 Aug 1997 11:57:12 +0100
To: CHEMISTRY@www.ccl.net
From: Simon Hogg <s.hogg@ic.ac.uk>
Subject: Holographic Representation of Molecules
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Does anyone have any information on producing holograms of molecular
structures?

The idea i have is to use such images for publication (or for posters,
etc.), that would make 3-D visualisation of the structure much simpler.

Any comments?



--	Simon Hogg, Imperial College, London, UK
Tel.	+44 171 589 5111 ext. 56721
Fax.	+44 171 584 3194
Email:	s.hogg@ic.ac.uk   Glass-List: glass-list@ic.ac.uk

From h.rzepa@ic.ac.uk  Wed Aug 13 09:17:23 1997
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Date: Wed, 13 Aug 1997 13:27:57 +0100
To: CHEMISTRY@www.ccl.net
From: "Rzepa, Henry" <h.rzepa@ic.ac.uk>
Subject: Java Virtual Machine Benchmark Times


In implementing a simple little  Java applet;

http://www.ch.ic.ac.uk/java/applets/f2m2f/

we noticed remarkable variation in the benchmark times. In
general Netscape 4 is the faster virtual machine, although MS
Internet Explorer 4 using the MS JIT option is only slightly
slower.  Earlier Version 3 browsers can be a lot slower.

To our surprise, we got the following typical selection
using Netscape 4.  This by the way is mostly for floating point operations.
Can anyone add new machine types to this list?  Java has been quite maligned
by developers for being slow, and this list perhaps confirms that
a  Java version of  Gaussian is probably not around the corner!

                                     Regular Bench   "Heavy Duty" Bench

Pentium Pro 200/NT           0.8s                   8s
Pentium 133/NT                  3
Pentium 75/Win95               4
Mac 8200/120                      8
SGI R10000 Power Ch      16 (??)

We have not been able to get good times on any  SGI machine.
Anyone with Linux times?

If anyone has any other benchmarks they could provide us with,
I will summarise for the list. Any explanation for the almost total
lack of correlation between processor performance for "regular
Comp chem" codes, and Java codes is also welcome. SGI, if you
folks are listening, would you like to comment?

Dr Henry Rzepa,  Dept. Chemistry,  Imperial College,  LONDON SW7 2AY;
mailto:rzepa@ic.ac.uk; Tel  (44) 171 594 5774; Fax: (44) 171 594 5804.
URL: http://www.ch.ic.ac.uk/rzepa/ 



From brain@amethyst.Chemie.Uni-Dortmund.de  Wed Aug 13 09:28:40 1997
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From: brain@amethyst.Chemie.Uni-Dortmund.de (Christoph Schwittek)
Message-Id: <9708131402.AA11928@amethyst.Chemie.Uni-Dortmund.de>
Subject: ADF: AE-Fit-functions (answer)
To: chemistry@www.ccl.net
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original question:

>Has anybody developed fit-functions for the all-electron-basis
>to be used in ADF? I ask this question because we would like to
>do a geometry-optimization in an electric field by hand (coordinate 
>driving) In our opinion it is important to take into account the
>inner shells too to explain a molecular electrostriction.
>Are there other opinions? 

answer:

>   Two comments on your question. First,  you can make the fit basis
>yourself. Any combination of two basis functions contributes to the
>density, and hence must be represented by the fit basis. For instance,
>if your basis has two p-sets with coefficients alpha1 and alpha2,
>then there is a d-type contribution in the density with coefficient
>alpha1 + alpha2 that must be represented by the fit basis (in fact,
>there are two more d-type contributions, with coefficients 2*alpha1
>and 2*alpha2). We had in Calgary an old utility program with ADF
>that would calculate from a given basis set all the possible combinations
>for the fit and their respective overlap, so that one can choose a reasonabl=
e
>fit basis from that. The program is called "alphas" -- maybe you can
>obtain it or its successor from Amsterdam. I have occasionally
>created basis sets with smaller cores, and consequently had to
>make a new fit basis each time.
>   Second, as you know, ADF uses numerical integration throughout.
>While this works well normally, I would be careful with all-electron
>calculations of heavy atoms because the very steep density near
>the nucleus might well strain the integration scheme over the limit,
>at least this was my experience sometimes. Admittedly, I haven't
>played with the detailed integration parameters here, and one can
>probably do a lot by just increasing the integration accuracy around
>the nuclei only.
>
>Hope this helps a little...
>
>Viele Gr=FC=DFe von Georg
>
>--
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>Dr. Georg Schreckenbach           Tel:     (USA)-505-667 7605
>Theoretical Chemistry T-12        FAX:     (USA)-505-665 3909
>M.S. B268, Los Alamos National      E-mail:  schrecke@t12.lanl.gov
>Laboratory, Los Alamos, New Mexico, 87545, USA
>Internet:    http://www.t12.lanl.gov/~schrecke/
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
Thank you for your hints, Georg!
  ---------------------------------------------------------------------
 -                 Dipl.-Phys.  Christoph Schwittek                    -
 -                                                                     -
 -             email: brain@citrin.chemie.uni-dortmund.de              -
 -              Organische Strukturchemie,  Ak Bleckmann               -
 -                       Universitaet Dortmund                         -
 -                        Otto-Hahn-Strasse 6,                         -
 -                          D-44227 Dortmund                           -
  ---------------------------------------------------------------------



From HINDE@novell.chem.utk.edu  Wed Aug 13 09:36:41 1997
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From: "Robert Hinde" <HINDE@novell.chem.utk.edu>
Organization:  Univ. of Tenn. Dept. of Chemistry
To: chemistry@www.ccl.net
Date:          Wed, 13 Aug 1997 8:28:11 EST
Subject:       re-using 2-e integrals with Gaussian 94 (long)
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Dear CCL colleagues:

I have a question concerning the re-use of 2-electron integrals
when performing counterpoise calculations using Gaussian 94.  I
would like to save the 2-electron integrals from a single point
energy calculation on the "full dimer" and then re-use these
integrals during the energy calculations on the individual mono-
mers.

Here is a csh script file that I thought would accomplish this for
the He-Ne dimer.  To conserve space, I'll omit the calculation for
the Ne atom in the full basis set, as it would be analogous to the
calculation for the He atom in the full basis set.  In addition,
I'll just deal with SCF energies here, but I should note that the
problem I describe below occurs during MP calculations as well.

=====
# full calculation 
# scf=conven and int=nosymm required to punch full 2-e file
g94 <<! > out.nogood.1
%chk=gt1
%int=gt1
# HF/6-311++G(d,p) scf=(conven,tight) int=nosymm

He-Ne test

0  1
He -2.00  0.00  0.00
Ne  2.00  0.00  0.00

!
# He atom in dimer basis set, reading 2-e file from above
# basis set and geometry are obtained from checkpoint file
/bin/cp gt1.chk gt2.chk
/bin/cp gt1.int gt2.int
g94 <<! > out.nogood.2
%chk=gt2
%int=gt2
%nosave
# HF/chkbasis scf=(conven,tight) geom=allcheck int=reuse massage

2 Nuc 0.0

!
# clean up from first run
/bin/rm gt1.chk gt1.int
=====

This gives me the following results:

           He-Ne: E(RHF) =  -131.386628606
He with ghost Ne: E(RHF) =  -2.86025182076

I obtain a different "He with ghost Ne" energy if I do not re-use
the 2-e integrals, as in the following script file:

=====
# He atom in dimer basis set starting from scratch
g94 <<! > out.ok
# HF/6-311++G(d,p) scf=tight massage

He-Ne test

0  1
He -2.00  0.00  0.00
Ne  2.00  0.00  0.00

2 Nuc 0.0

!
=====

This gives the following, higher energy:

He with ghost Ne: E(RHF) =  -2.85998673481

I found that I can trick Gaussian into giving me this higher energy
while re-using the 2-e integrals with the following script file,
which uses the MASSAGE keyword to break the symmetry of the full
dimer:

=====
# full calculation using massage to destroy symmetry
# scf=conven and int=nosymm required to punch full 2-e file
g94 <<! > out.trick.1
%chk=gt1
%int=gt1
# HF/6-311++G(d,p) scf=(conven,tight) int=nosymm massage

He-Ne test

0  1
He -2.00  0.00  0.00
Ne  2.00  0.00  0.00

1 Nuc 2.0

!
# He atom in dimer basis set, reading 2-e file from above
# basis set and geometry are obtained from checkpoint file
/bin/cp gt1.chk gt2.chk
/bin/cp gt1.int gt2.int
g94 <<! > out.trick.2
%chk=gt2
%int=gt2
%nosave
# HF/chkbasis scf=(conven,tight) geom=allcheck int=reuse massage

2 Nuc 0.0

!
# clean up from first run
/bin/rm gt1.chk gt1.int
=====

Using this script, I get the following results:

           He-Ne: E(RHF) =  -131.386628606
He with ghost Ne: E(RHF) =  -2.85998673481

which match those obtained without re-using integrals.

My question is this:  Why does destroying the symmetry of the full
dimer change the energy obtained for the helium monomer when the
2-e integrals are re-used?  Furthermore, I notice that the "wrong"
helium monomer energy is actually considerably lower than the "right"
energy.  For a comparison, the energy for an isolated helium atom
(i.e. with no neon ghost) using the 6-311++G(d,p) basis set is
E(RHF) =  -2.85998392082.

Any advice would be appreciated.

Robert Hinde / Univ. of Tennessee, Dept. of Chemistry / rhinde@utk.edu


From youngd2@mail.auburn.edu  Wed Aug 13 11:17:25 1997
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Hi,

	I've searched a number of sources and not come up with anything,
so I'm hoping someone can send me a reference or point me in the right
direction.

	What I am looking for is a proof of the existence of the
Hartree-Fock limit.  Is it possible that this is an observed result for
which no derivation has ever been done?

                                Dave Young
                                youngd2@mail.auburn.edu

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

          Live long and maintain marketable job skills.

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



From korkin@qtp.ufl.edu  Wed Aug 13 14:17:24 1997
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Date: Wed, 13 Aug 1997 14:09:07 -0400 (EDT)
From: Anatoli Korkin <korkin@qtp.ufl.edu>
Reply-To: Anatoli Korkin <korkin@qtp.ufl.edu>
Subject: Summary - B3LYP for H-bonded systems
To: chemistry@www.ccl.net
Cc: zuilhof@Sg1.OC.WAU.NL, leonid@tiger.jsums.edu, korkin@qtp.ufl.edu
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>Does any one know references on comparative ab initio and DFT (preferably 
>B3LYP) studies of H-bonded systems and proton transfer? Any reviews on
>this topic?

Dear CCLers,
CCLers,

Thanks to everybody who responded on my question. I have received as
much answers as requests for summary. It was also fun to hear from and
about my old friends and to make new contacts. H-boding seems to be a
nice topic for a chat, although I was surprized it is still so popular :-)

We have decided to extend our introduction a bit to cite and to discuss
some recent results.

Have a good day, everybody!

Anatoli

P.S. Sorry, I have no time to clean up messages properly. Please, substract 
what you need yourself. I also keep the addresses to let H-bonding community 
to have some local talks among them :-)

Summary:
--------


Dear Anatoli,

Dennis Salahub has worked on this extensively; several imporatant papers
were published recently, also with repsect to developing new functionals
for these purposes (BLap.. functionals).

What systems are you interested in? Please summarize the responses,
I'm curious.

Hope all is well at your end. It's finally HOT here (for German standards).

All the best,
Peter

-- 

    ////
___|--00___________________________________________________________________
   C   ^     Dr. Peter R. Schreiner
    \ ~/     Institut fuer Organische Chemie
    <><>     Georg-August Universitaet Goettingen
             Tammannstr. 2                    Phone: +49-(0)551-393287
             D-37077 Goettingen, Germany      FAX:   +49-(0)551-399475
	     http://www.gwdg.de/~ucoc/schreiner
___________________________________________________________________________



HI, ANATOLI -

     I can certainly give you one.
J. E. Del Bene, W. B. Person, and K. Szczepaniak,
J. Phys. Chem. 99, 10705 (1995).

     DFT/B3LYP can be quite erratic.  What's up?????   Janet



hi Anatoli, 

I've been working for a while in H-bonded systems comparing dft (b3lyp is
included) and ab-initio methods. 
Maybe this can help:

"Cooperative effects in water trimers. The performance of density
functional approaches" L. Gonzalez et al.  J. Molec. Struct. (Theochem)
371 (1996) 1

"High level ab initio versus DFT calculations on (H2O2)2 and H2O2-H2O
complexes as prototypes of multiple h-bonded systems" L. Gonzalez et al. 
J. Comput. Chem. 18 (1997) 1124.

Best wishes, 

	Leticia Gonzalez
*********************************
*  Leticia Gonzalez             *
*  Dept. of Chemistry           *
*  Dalhousie University         *
*  Halifax, NS  B3H 4J3         *
*  Canada                       *
*                               *
*  Phone:   902-494 7021        *
*  e-mail: gonzalez@is.dal.ca   *
*********************************


Hi Anatoli,

I assumed you already received a message from Leti Gonzales about her 
work done on water dimers (she sits next door in Boyd's lab).

I also can add to that list a paper J.Chem.Soc., Faraday Trans., 
1997, 93(2), 333.

Best regards,

Vladimir


**********************************************************************
Vladimir V. Murashov                 

Department of Chemistry                  tel   : +1-902-494-6538
Dalhousie University                     fax   : +1-902-494-1310
Halifax, NS                              E-mail: murashov@is2.dal.ca
Canada B3H 4J3
**********************************************************************
                      

I hope you find the following references useful.

Sim et al. JACS 1992, 114, 4391 "Gaussian density functional calculations on h 
bonded systems"

Kovacs et al J. Comp. Chem. 1996, 17(16), 1804 "Theoretical study of 
intramolecular hydrogen bonding ... "

Gonzalez et al J. Comp. Chem. 1997, 18, 1124 " High level ab initio versus dft 
calculations on ... "

Hobza et al J. Comp. Chem. 1995, 16(11), 1315 " density functional theory and 
molecular clusters"

Kind Regards,
Damian Moran

    email: damian.moran@mq.edu.au  voice:(+61) 2 9850 8278 
fax:(+61) 2 9850 8313 www:http://www.chem.mq.edu.au/~dmoran
School of Chemistry,Macquarie University,NSW 2109 Australia

        

H-bonded, i don't know, but you might find


@ARTICLE{Jursic1996a,
        AUTHOR             = {Branko S. Jursic},
        JOURNAL            = CPL,
        PAGES              = {603-608},
        TITLE              = {Density functional theory study of radical 
hydrogen abstraction with hydrogen and hydroxyl radicals},
        VOLUME             = {256},
        YEAR               = {1996}
}


interesting anyway.
---------------------------
Dear Anatoli,

a comparison between HF, MP2, different DFT methods and experimental data 
for the water dimer and hydrogen bonded base pairs is given in:

A. St-Amant, Density functional methods in biomolecular modeling, Reviews 
in Computational Chemistry 7, chapter 5, VCH 1996.

We have carried out some calculations of hydrogen bonded nucleic acid base 
pairs at MP2/6-31G**//HF/6-31G** and B3LYP/6-31G** level. The B3LYP-
intermolecular distances seem to be somewhat better than the HF- 
distances and the interaction energies from single point MP2 and B3LYP 
are in reasonable agreement.

Michael Meyer

-- 
----------------------------------------------------------------------------
Michael Meyer                              
Institut fuer Molekulare Biotechnologie (IMB)     
Biocomputing                                      E-mail: mmeyer@imb-jena.de
Beutenbergstrasse 11, Jena                        Tel.:   +49-3641-65-6203
Postfach 100 813, D-07708 Jena, Germany           Fax:    +49-3641-65-6210
----------------------------------------------------------------------------


Anatoli, in response to your question about proton transfer and DFT
methods, we have been doing alot of calcs on the effectiveness of 
various DFT methods for the study of short, strong (or low-barrier)
hyrogen bonds. One of these studies will come out this month in JACS,
watch for it!

If I had to summarize, I would say that in general the B3LYP functional
gives geomtries and energies of reactions almost identical to MP2 in all
cases. BLYP itself often gives hydrogen bond energies a little larger
than either MP2 or B3LYP.  For the hydrogen bifluoride system (coming
out in Theochem shortly) the B3LYP, BLYP, MP2, MP3, MP4, QCISD,and CCSD
results are almost identical. The SVWN and HF results are somewhat 
different than the other correlated methods.

If you are interested in more specifics just contact me.

Mike M.

**************************************************************************
   Michael A. McAllister		
   Assistant Professor of Chemistry	voice: 940-565-4584
   University of North Texas 	 	  fax: 940-565-4318	
   P.O. Box 305070			email: McAllister@unt.edu
   Denton, TX 76203			  www: http://people.unt.edu/~mam0008	
**************************************************************************

hese may be of some use:
Proton affinity and DFT  Phys Chem (jpc) 100 (1996) 11595

Deprotonation (E2 reactions) jpc 100 (1996) 16892

Gas-phase acidity            jpc 100 (1996) 17465

C-H...O hydrogen bonds, MP2 cf. B-LYP
                             Chem Phys Letters 266(1,2) (1997) 23
----------

Your friend Igor Svishchev has just joined our Department.

   Best Wishes,

   E. Lewars
=================


Dr. Korkin - 
Forgive me if I recommend a couple of my own publications:
A. T. Pudzianowski, "A Systematic Appraisal of Density Functional
Methodologies for Hydrogen Bonding in Binary Ionic Complexes," 
J. Phys. Chem. 100 (12), 4781-4789 (1996)     and

A. T. Pudzianowski, "Current computational approaches to the strong
hydrogen bond," Recent Res. Devel. in Physical Chem., 1, 81-97 (1997).

The first deals with the strong H-bond and has a lot to say about
comparisons of B3-LYP and B-LYP with MP2, mostly with the 6-311++
G(d,p) basis set. The second is a review of the whole area of com-
putational descriptions of the strong H-bond. The reference is
a bit obscure, so if you're interested please let me know and I'll
send you a reprint.
            Hoping this will be helpful,
             Andrew Pudzianowski
***********************************************************************
Andrew T. Pudzianowski,Ph.D.       
Bristol-Myers Squibb PRI      
Box 4000                  *   "There are two ways to do things.
Princeton NJ 08543-4000   *    There's the scientific way, and               
(609) 252-4248            *    there's the disgusting way."
(609) 252-6030: fax       *          
pudzianowski@bms.com      *        "Beakman's World", 1994
***********************************************************************

Perhaps

J. M. L. Martin, V. Aviyente, and C. Lifshitz, ``The insertion of amines 
and alcohols into proton bound dimers. A density functional study'', 
Journal of Physical Chemistry A 101, 2597-2606 (1997) 

might interest you.

JM
---------------------------------------------------------------------------
dr. Jan M.L. Martin                Senior Lecturer, Computational Chemistry
       Department of Organic Chemistry/Kimmelman Building, Room 262
            Weizmann Institute of Science/Rechovot 76100/ISRAEL
FAX +972(8)9344142 Phone +972(8)9342533 E-mail comartin@wicc.weizmann.ac.il
  *** research group WWW home page  http://theochem.weizmann.ac.il/   ***
---- kol ha-olam kulo gesher tzar me'od, v'ha-ikar lo l'hitfached k'lal ---


See for a very recent review :
	
	Carlo Adamo, Vincenzo Barone
	Structural and Dynamical Features of Hydrogen Bonds
	from Conventional and Hybrid Density Functional Methods
	in : Recent Advances in Density Functional Meythods, Part II,
	Ed.: Delano P. Chong, World Scientific, 1997, Chap. 5,
	pp. 115-164
	( Recent Advances in Computational Chemistry, Vol.1 )

-- 
Dr. Heinz Schiffer              Phone   ++49-69-305-2330                        
Hoechst CR&T                    Fax     ++49-69-305-81162                       
Scientific Computing, G864      Email   schiffer@h1tw0036.hoechst.com           
65926 Frankfurt am Main                 Schiffer@CRT.hoechst.com


Hi Anatoli,

try

1. P. Hobza, J. Sponer, T. Reschel: "Density Functional Theory and
   Molecular Clusters", J. Comput. Chem. 16 (1995) 1315

2. M. Planas, C. Lee, J. Novoa: "Kinetic of the Proton Transfer in X-(H2O)4
   Clusters (X=H2O, NH3, H2S, and HCl): Evidence for a Concerted Mechanism",
   J. Phys. Chem. 100 (1996) 16495

3. J. Del Bene, W. Person, K. Szczepaniak: "Properties of Hydrogen-Bonded
   Complexes Obtained from the B3LYP Functional with 6-31G(d,p) and 6-31+G(d,p)
   Basis Sets: Comparison with MP2/6-31+G(d,p) Results and Experimental Data",
   J. Phys. Chem. 99 (1995) 10705

4. Z. Latajka, Y. Boutellier, S. Scheiner: "Critical assessment of density
   functional methods for study of proton transfer processes. (FHF)-", Chem.
   Phys. Lett. 234 (1995) 159

5. Z. Latajka, S. Berski: "Density functional study of the H3N-Cl2 system - the
   importance of Hartree-Fock exchange in density function methods", J. Mol.
   Struct. (Theochem) 371 (1996) 11

6. J. Lundell, Z. Latajka: "Density Functional Study of Hydrogen-Bonded Systems:
   The Water-Carbon Monoxide Complex", J. Phys. Chem. A 101 (1997) in press.

Sincerely yours,
Bernd


-----------------------------------------------------
Dr. Bernd Kallies
Institut fuer Physikalische und Theoretische Chemie
Universitaet Potsdam
Am Neuen Palais 10
14469 Potsdam
GERMANY
e-mail: kallies@serv.chem.uni-potsdam.de
WWW   : http://www.chem.uni-potsdam.de/~kallies/kallies.htm
Tel   : [+49] (0)331 / 977-1313
Fax   : [+49] (0)331 / 977-1315
-----------------------------------------------------









From qftramos@usc.es  Wed Aug 13 15:17:27 1997
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Date: Wed, 13 Aug 1997 20:30:02 +0200 (MET DST)
From: Antonio Fernandez Ramos <qftramos@usc.es>
To: Lista computacional <CHEMISTRY@www.ccl.net>
Subject: Euler angles
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Dear netters:
	
	Anybody know a subroutine (in Fortran) be able to rotate a geometry as 
regard as another geometry as a funtion of Euler angles?

Thank you very much,
Antonio Fernandez E-mail:qftramos@usc.es



From info@intersearch.net  Wed Aug 13 16:17:27 1997
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From: info@intersearch.net (Intersearch Information )
To: "'chemistry@www.ccl.net'" <chemistry@www.ccl.net>
Subject: Warum Werbungen im Internet versagen!
Date: Wed, 13 Aug 1997 20:09:32 +-200
MIME-Version: 1.0
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Sehr geehrte Damen und Herren!

Anbei erhalten Sie Hinweise und Tips wie Sie Ihren Werbeerfolg
im Internet verbessern koennen. Hierzu sollten Sie folgendes
Wissen:


1) Warum die meisten Werbungen im Internet versagen!

   a) Das Internet ist eine hoechst persoenliche Sache!
      Ihre Werbung sollte daher das persoenliche Interesse Ihrer
      Besucher wecken und keinesfalls allgemein gerichtet sein.
      Sprechen Sie Ihre Zielkunden direkt und persoenlich an,
      so als ob Sie mit einer Person direkt in Kontakt sind.

   b) Ihre Seiten muessen VOR ALLEM gut getextet sein. Es sind
                          --------- ------------------
      weder AktivX, Yava noch langsam zu ladende Bilder welche zu
      Erfolg fuehren. Lassen Sie sich hier auch von Ihrem Provider
      nicht taeuschen. Die Vorfuehrungen gehen meist schnell.=20
      Im Weltnetz siehts dann anders aus, wenn Ihre Nachricht ueber
      zahlreiche Router und Maschinen uebertragen werden muss.

   c) Werben Sie nicht auf Servern auf welchen hunderte oder gar
      tausende Mitbewerber werben. Besonders dann nicht, wenn auf=20
      Ihren Seiten Links zu diesen vorhanden sind.=20
      (Das gilt besonders fuer den Toursimus. Allein in Europa
      sind rd. 500.000 Tourismusanbieter im Netz).

   d) Suchmaschinen gelten als die Orientierungsmittel im Internet.
      Sie sollten bei moeglichst vielen Suchdiensten eingetragen sein.
      Es ist massgeblich bei Suchmaschinen an der richtigen Stelle=20
      plaziert zu sein. Wenn Ihr Angebot nicht unter den ersten 100
      ist, hat dieses nur geringe Chancen gefunden zu werden.


2) Argumente wie "80 Millionen Internetbenutzer", "Werbung weltweit,
   annaehernd zum Nulltarif", usw. zaehlen dabei nicht, oder sind=20
   bedeutungslos.

   Ihr Angebot kann nur einen Bruchteil der Anwender erreichen.
   Das Nutzerverhalten ist immer gleich. Kaum ein Internetbenutzer
   ist bereit Muehsam nach ihm interessierenden Angeboten zu suchen.
   Die Menschen wollen die Information einfach und rasch.=20

   Sie sollten dafuer sorgen, dass Ihr Angebot entsprechend einfach
   gefunden wird.=20

   Pruefen Sie die verschiedenen Suchmaschinen! Sie werden feststellen,
   dass Ihr Angebot in den wenigsten Faellen unter den ersten 100, 50=20
   oder gar 10 ist.=20

   Bei der Pruefung sollten Sie auch nicht nach Ihrem Namen suchen,
   sondern zumindest nach dem Produkt oder der Dienstleistung welche
   Sie anbieten bzw. verkaufen moechten.=20

2) Noch ein Wort zu Werbeagenturen:
   Was glauben Sie warum viele (nicht alle) traditionelle Werbeagen-
   turen das Internet ablehnen? Ganze einfach, weils weniger Geld=20
   kostet als herkoemmliche Werbung.=20
   Viele Agenturen denken in Auflagen, Minuten oder Sekunden.=20
   Die hier erreichbaren Mittlerprovisionen koennen sich sehen lassen.
   Das Internet wird von diesen meist als Pfennigfuchserei betrachtet.

   Die Argumente gegen das Internet scheinen auch noch richtig zu=20
   sein, weil die wenigsten Firmen mit Internetwerbung Erfolg haben.=20
   Jene die erheblichen Erfolg haben, haben darueber genau nachge-
   dacht und die richtigen Schritte eingeleitet. Es gibt genuegend
   Firmen welche Millionenumsaetze ueber das Internet erzielen.

   Das Internet ist ein sehr gutes Medium. Es geht nur darum diese=20
   richtig und mit know how fuer sich zu nutzen. Weil das erforder-
   liche know how die wenigsten Webdesigner haben, scheinen die=20
   Argumente gegen das Internet richtig zu sein.


Weiteres und sehr wesentliches erfahren Sie unter:
http://www.kso.co.uk/
Beachten Sie hier im besonderen die Seiten Marketing.=20
Hier erfahren Sie uebrigens auch wieviel ein Werbebanner kosten
darf. Rechnen Sie mit 3% Ruecklauf, dann liegen Sie gut und haben
Sicherheiten hinsichtlich moeglicher Verbesserungen.

Hinsichtlich Webpromotion empfehlen wir Ihnen die folgende Seite
zu besuchen: http://at.intersearch.net/prospekt.html

Profis arbeiten mit Profis!


Mit freundlichen Gruessen
Intersearch Europe
Gerhard Monz
---------------------------------------------------
Vom Dekorations- ins Informationszeitalter!
http://de.intersearch.net (Deutschland)
http://at.intersearch.net (Oesterreich)
=00

From info@intersearch.net  Wed Aug 13 16:29:39 1997
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From: info@intersearch.net (Intersearch Information )
To: "'CHEMISTRY@www.ccl.net'" <CHEMISTRY@www.ccl.net>
Subject: Warum Werbungen im Internet versagen!
Date: Wed, 13 Aug 1997 20:09:33 +-200
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable


Sehr geehrte Damen und Herren!

Anbei erhalten Sie Hinweise und Tips wie Sie Ihren Werbeerfolg
im Internet verbessern koennen. Hierzu sollten Sie folgendes
Wissen:


1) Warum die meisten Werbungen im Internet versagen!

   a) Das Internet ist eine hoechst persoenliche Sache!
      Ihre Werbung sollte daher das persoenliche Interesse Ihrer
      Besucher wecken und keinesfalls allgemein gerichtet sein.
      Sprechen Sie Ihre Zielkunden direkt und persoenlich an,
      so als ob Sie mit einer Person direkt in Kontakt sind.

   b) Ihre Seiten muessen VOR ALLEM gut getextet sein. Es sind
                          --------- ------------------
      weder AktivX, Yava noch langsam zu ladende Bilder welche zu
      Erfolg fuehren. Lassen Sie sich hier auch von Ihrem Provider
      nicht taeuschen. Die Vorfuehrungen gehen meist schnell.=20
      Im Weltnetz siehts dann anders aus, wenn Ihre Nachricht ueber
      zahlreiche Router und Maschinen uebertragen werden muss.

   c) Werben Sie nicht auf Servern auf welchen hunderte oder gar
      tausende Mitbewerber werben. Besonders dann nicht, wenn auf=20
      Ihren Seiten Links zu diesen vorhanden sind.=20
      (Das gilt besonders fuer den Toursimus. Allein in Europa
      sind rd. 500.000 Tourismusanbieter im Netz).

   d) Suchmaschinen gelten als die Orientierungsmittel im Internet.
      Sie sollten bei moeglichst vielen Suchdiensten eingetragen sein.
      Es ist massgeblich bei Suchmaschinen an der richtigen Stelle=20
      plaziert zu sein. Wenn Ihr Angebot nicht unter den ersten 100
      ist, hat dieses nur geringe Chancen gefunden zu werden.


2) Argumente wie "80 Millionen Internetbenutzer", "Werbung weltweit,
   annaehernd zum Nulltarif", usw. zaehlen dabei nicht, oder sind=20
   bedeutungslos.

   Ihr Angebot kann nur einen Bruchteil der Anwender erreichen.
   Das Nutzerverhalten ist immer gleich. Kaum ein Internetbenutzer
   ist bereit Muehsam nach ihm interessierenden Angeboten zu suchen.
   Die Menschen wollen die Information einfach und rasch.=20

   Sie sollten dafuer sorgen, dass Ihr Angebot entsprechend einfach
   gefunden wird.=20

   Pruefen Sie die verschiedenen Suchmaschinen! Sie werden feststellen,
   dass Ihr Angebot in den wenigsten Faellen unter den ersten 100, 50=20
   oder gar 10 ist.=20

   Bei der Pruefung sollten Sie auch nicht nach Ihrem Namen suchen,
   sondern zumindest nach dem Produkt oder der Dienstleistung welche
   Sie anbieten bzw. verkaufen moechten.=20

2) Noch ein Wort zu Werbeagenturen:
   Was glauben Sie warum viele (nicht alle) traditionelle Werbeagen-
   turen das Internet ablehnen? Ganze einfach, weils weniger Geld=20
   kostet als herkoemmliche Werbung.=20
   Viele Agenturen denken in Auflagen, Minuten oder Sekunden.=20
   Die hier erreichbaren Mittlerprovisionen koennen sich sehen lassen.
   Das Internet wird von diesen meist als Pfennigfuchserei betrachtet.

   Die Argumente gegen das Internet scheinen auch noch richtig zu=20
   sein, weil die wenigsten Firmen mit Internetwerbung Erfolg haben.=20
   Jene die erheblichen Erfolg haben, haben darueber genau nachge-
   dacht und die richtigen Schritte eingeleitet. Es gibt genuegend
   Firmen welche Millionenumsaetze ueber das Internet erzielen.

   Das Internet ist ein sehr gutes Medium. Es geht nur darum diese=20
   richtig und mit know how fuer sich zu nutzen. Weil das erforder-
   liche know how die wenigsten Webdesigner haben, scheinen die=20
   Argumente gegen das Internet richtig zu sein.


Weiteres und sehr wesentliches erfahren Sie unter:
http://www.kso.co.uk/
Beachten Sie hier im besonderen die Seiten Marketing.=20
Hier erfahren Sie uebrigens auch wieviel ein Werbebanner kosten
darf. Rechnen Sie mit 3% Ruecklauf, dann liegen Sie gut und haben
Sicherheiten hinsichtlich moeglicher Verbesserungen.

Hinsichtlich Webpromotion empfehlen wir Ihnen die folgende Seite
zu besuchen: http://at.intersearch.net/prospekt.html

Profis arbeiten mit Profis!


Mit freundlichen Gruessen
Intersearch Europe
Gerhard Monz
---------------------------------------------------
Vom Dekorations- ins Informationszeitalter!
http://de.intersearch.net (Deutschland)
http://at.intersearch.net (Oesterreich)
=00

From mn1@helix.nih.gov  Wed Aug 13 16:37:14 1997
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	by www.ccl.net (8.8.3/950822.1) id QAA08762; Wed, 13 Aug 1997 16:06:04 -0400 (EDT)
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	Wed, 13 Aug 1997 16:05:52 -0400 (EDT)
Date: Wed, 13 Aug 1997 16:05:52 -0400 (EDT)
From: "M. Nicklaus" <mn1@helix.nih.gov>
Message-Id: <199708132005.QAA26352@helix.nih.gov>
To: CHEMISTRY@www.ccl.net
Subject: SMILES database
Cc: mn1@helix.nih.gov, gwa@cu.nih.gov, brunob@helix.nih.gov,
        ZAHAREVITZ@dtpax2.ncifcrf.gov, rgab@proteus.co.uk


Hi all,

On Mon, 21 Jul 1997, Richard Bone <rgab@proteus.co.uk> wrote:
> Following up on my enquiry about SMILES databases last week, here is a brief
> summary of the responses.

We have converted the (open part) of the NCI database to SMILES
format.  It will be made available to the public very shortly,
probably at http://epnws1.ncifcrf.gov:2345/dis3d/3ddatabase/pubstruc.html.

This SMILES database contains essentially all open structures 
of the NCI database up to about a year ago or so.  The exact cutoff
date is still being decided upon, but the database will contain
on the order of 220,000 compounds.

No structures were excluded a priori based on chemical grounds.
This means, for example, that metal-containing compounds were
left in the database, and it is up to the user to ascertain
the usefulness of these and other SMILES strings.

The program Corina v. 1.7 was used to generate 3D coordinates from
the connection tables.  Using a little Perl script, the conversion
program Babel v. 1.6 was then used to generate the SMILES strings
from the 3D coordinates, which Babel needs (see below).  
(See http://schiele.organik.uni-erlangen.de/corina/corina.html,
http://mercury.aichem.arizona.edu/babel.html for the home pages of
Corina and Babel, respectively.)

This procedure clearly entails the risk Wolf-Dietrich Ihlenfeldt 
<wdi@eros.ccc.uni-erlangen.de> described in his posting on 
Wed, 16 Jul 1997:
> BTW, beware if you want to repeat this with the popular
> Babel conversion program (V1.6). First, the program will not be
> able to read the original datafile because it contains neither
> display coordinates nor 3D coordinates, only connectivity. Babel
> will report a cryptic message 'No atoms found in this structure',
> although the file is syntactically correct. You
> must use the 3D-enhanced file. Second, from the first 1000
> records the CACTVS results and Babel results are
> structurally different for 69 records (7%). As far as I have checked,
> this is all because the MDL read routines of Babel do not
> read the atomic charge field in the SD file. This is of
> course deadly when reading back the SMILES string without charge
> information, since the SMILES standard contains hydrogen
> addition rules. So a nitro group which was coded with
> a positively charged N and a negatively charged O will suddenly
> contain an N-O-H group because the SMILES string N(=O)O without
> charge information demands
> the addition of a hydrogen atom to the single-bonded oxygen.
> The N will also receive an extra hydrogen, or end up as a radical,
> depending on your reader software.

The problem with the nitro groups can be trivially fixed by string
substitution, and we can do this in the NCI SMILES database.
However, we'd first like to ask prospective users whether they
would prefer the 'raw' Babel output, or whether they want us to 
apply this fix.  Quite exactly 7% of the compounds in the NCI 
database contain a nitro group, so our fix should take care of 
the majority of the problems Wolf-Dietrich Ihlenfeldt alluded to.

No other patches were applied, and together with the presence of
metals and other 'weird' things in the database this means that 
the use of this database is at anyone's own risk.  So, please
caveat emptor!  Of course, if people find specific problems, we'd
like to know about them so that they can eventually be fixed (but
no promises are made!)

A few more technical data:  The file with the SMILES database is
about 15 MB large (uncompressed).  Each record contains the NSC 
number and the CAS RN at the beginning; a simple  colrm 1 23 
will create a file with just the SMILES strings.  The largest 
SMILES string in the database is just under 600 characters long.

Marc C. Nicklaus & Bruno Bienfait

------------------------------------------------------------------------
 Marc C. Nicklaus, Ph.D.                 National Institutes of Health
 E-mail: mn1@helix.nih.gov               Bldg 37, Rm 5B29
 Phone:  (301) 402-3111                  BETHESDA, MD 20892-4255    USA
 Fax:    (301) 496-5839    http://www.nci.nih.gov/intra/lmch/MCNBIO.HTM
    Laboratory of Medicinal Chemistry, National Cancer Institute,  &
  Lab. of Structural Biology, Div. of Computer Research and Technology
------------------------------------------------------------------------


From jianwang@cgl.ucsf.EDU  Wed Aug 13 18:17:27 1997
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	id OAA15604; Wed, 13 Aug 1997 14:24:24 -0700 (PDT)
Date: Wed, 13 Aug 1997 14:24:24 -0700 (PDT)
From: Jian Wang <jianwang@cgl.ucsf.edu>
X-Sender: jianwang@socrates.ucsf.edu
To: CHEMISTRY@www.ccl.net
cc: Jian Wang <jianwang@cgl.ucsf.edu>
Subject: Empirical solvation models
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Dear CCL netters

Could someone points to me some empirical methods to 
estimate free solvation energy of a molecule in
aqueous solution? 

There are many solvation models to calculate free
solvation energy such as QM SCRF methods, AMSOL, PB,
GBSA, MD, MC and etc.  What we would like to know is
the performance of empirical methods, i.e., what are
their standard errors over a large set of experimental 
data or over other theoretical results, where an empirical
approach will break down.  

I will summarize the replies if there are enough
interests.

Thanks,

Jian Wang,  Ph.D                             
Department of Pharmaceutical Chemistry     Tel:  (415)-476-2597 (O)
Box 0446, Room S-1019                            (415)-752-2256 (H)
University of California                   Fax:  (415)-476-0688 (O)
San Francisco, CA94143-0446                     
U.S.A.                                     Email: jianwang@cgl.ucsf.edu


From jianwang@cgl.ucsf.EDU  Wed Aug 13 18:33:48 1997
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Date: Wed, 13 Aug 1997 14:20:00 -0700 (PDT)
From: Jian Wang <jianwang@cgl.ucsf.edu>
X-Sender: jianwang@socrates.ucsf.edu
To: CHEMISTRY@www.ccl.net
cc: Jian Wang <jianwang@cgl.ucsf.edu>
Subject: Empirical solvation model
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MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII



Dear CCL netters

Could someone points to me some empirical methods to 
estimate free solvation energy of a molecule in
aqueous solution? 

There are many solvation models to calculate solvation 
free energy such as QM SCRF methods, AMSOL, PB,
GBSA, MD, MC and etc.  What we would like to know is
the performance of empirical methods, i.e., what are
their standard errors over a large set of experimental 
data or over other theoretical results, where an empirical
approach will break down.  

I will summarize the replies if there are enough
interests.

Thanks,

Jian Wang,  Ph.D                             
Department of Pharmaceutical Chemistry     Tel:  (415)-476-2597 (O)
Box 0446, Room S-1019                            (415)-752-2256 (H)
University of California                   Fax:  (415)-476-0688 (O)
San Francisco, CA94143-0446                     
U.S.A.                                     Email: jianwang@cgl.ucsf.edu


From jeanluc.verschelde@rug.ac.be  Tue Aug 12 06:17:07 1997
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Message-Id: <33F0533C.41C6@rug.ac.be>
Date: Tue, 12 Aug 1997 12:12:44 +0000
From: Verschelde Jean-Luc <jeanluc.verschelde@rug.ac.be>
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Subject: cluster
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Hi all,

	I am looking for a program that clusters structures by calculating the
RMS deviation and is able to read PDB files.
Who can help me?

	Thanks,

 
-- 
			Verschelde Jean-Luc

		Flanders Interuniversity Institute for Biotechnology
			
			Department of Biochemistry
			Faculty of Medecine
			Universiteit Gent
			Ledeganckstraat 35
			B-9000 Gent
			Belgium
	
		Tel.: 0032-9-2645306  Fax.:0032-9-2645337
		E-mail: jeanluc.verschelde@rug.ac.be


From baker@terminator.chem.uiowa.edu  Wed Aug 13 18:43:04 1997
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Date: Wed, 13 Aug 1997 16:27:51 -0700 (PDT)
From: "Nathan A. Baker" <baker@terminator.chem.uiowa.edu>
To: CCL <chemistry@www.ccl.net>
Subject: Hartree-Fock limit
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Isn't the proof of the Hartree-Fock limit simply the proof of the 
validity for a expansion of a function in terms of a complete set?  
Pinsky describes this in terms of Parseval's theorem in his book "Partial 
Differential Equations and Boundary-Value Problems with Applications, 2nd 
ed." on page 20.

In other words, we postulate that some trial function, a linear 
combination of n basis functions, is the solution to the Schrodinger 
equation.  If the n basis functions form a complete set (usually 
infinite), then some linear combination of these (as n goes to infinity) 
is the solution to the Schrodinger equation.

The difference between the true solution and the linear combination is 
called the mean squared convergence, which goes to zero in the limit of a 
complete set.

This probably could have been stated better, but I think I conveyed the 
general gist.

-----------------------------------------------
Nathan Baker * baker@terminator.chem.uiowa.edu

HELP! MY TYPEWRITER IS BROKEN!
	-- E. E. CUMMINGS
-----------------------------------------------


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Date: Wed, 13 Aug 1997 14:04:14 -0700
To: chemistry@www.ccl.net
From: Dan Haun <haun@intsim.com>
Subject: Downloading SCULPT from the UK and Europe


Hi netters,

I just wanted to expound on a post for SCULPT that I put out yesterday.  If
you are in Europe and are having trouble accessing our web site, please use
the mirror in BioMedNet.

To download a trial copy of SCULPT from the BioMedNet homepage, please do
the following:
On your web browser, enter http://www.biomednet.com.  Select the "Join"
button if you are not a member of BioMedNet.  Please enter in your
information including BioMedNet User Name and Password.  Once you have
completed the information, select the "Enter Bio Net" button.  Next select
the "Shopping Mall" Button.  Then select the "Software" button.  Select
"SCULPT" which is located halfway down the list (in alphabetical order
according to Interactive Simulations,Inc.).  Now go ahead and download
SCULPT!   In addition to gaining further information on SCULPT, you can now
retrieve invaluable information as a member of the biological / medical
community.   

Sincerely yours,

Dan Haun

Daniel P. Haun                                Tel:       (619) 658-9462
Interactive Simulations Inc.             Toll Free: (888) 272-8578 
5330 Carroll Canyon Rd.                Email:     haun@intsim.com      
San Diego, CA 92121                    Fax:       (619) 658-9463     
Web site http://www.intsim.com             


