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Hello Steve and All!

On Wed, 5 Nov 2003, Steve Williams wrote:

> I have a colleague who would like to some quantum chemistry calculations on
> the following system: R-OH+  --> R-NH, that is, a smooth transition from an
> open shell alcohol radical cation to a neutral radical amide.  Is there a
> way to do this?  We discussed several options, based on what we have here:

> 3) Is there existing code out there that already does this?

With Turbomole (http://www.turbomole.com) you can do this. Or, I should
say, you can at least define a fractional nuclear charge, and Turbomole
performs the calculation. I tried HF, DFT and RI-MP2 on N2 with one of
the N's having a q of +6.5.

The basis set might be a problem, as they are optimised for specific
atoms. I guess one way of getting around this would be to use a combined
basis set for the metamorphosing atom, consisting of the BS of both
the initial (O) and the final (N) atoms.

Have a nice day,
    Mikael Johansson
    University of Helsinki
    Department of Chemistry
    mikael.johansson^at^helsinki.fi
    http://www.helsinki.fi/~mpjohans/
    Phone: +358-9-191 50185
    FAX  : +358-9-191 50169

From chemistry-request@ccl.net Wed Nov  5 15:24:23 2003
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Subject: RE: Bond order in gaussian
Date: Wed, 5 Nov 2003 15:23:48 -0500
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Ding,

I think I figured this out: 
BD means a bonding orbital
CR means a core orbital
LP means a lone pair orbital
RY* means a Rydberg orbital
BD* means an antibonding orbital

Important question: are there TWO of these tables?  If so, one is for the alpha electrons and one is for the beta electrons.  If the table you show is for the beta electrons only, the sum of 7 is correct.  

CCLers, am I right?

--David Shobe


-----Original Message-----
From: Computational Chemistry List [mailto:chemistry-request^at^ccl.net]On
Behalf Of dxl^at^mail.ustc.edu.cn
Sent: Tuesday, November 04, 2003 9:22 PM
To: chemistry^at^ccl.net
Subject: CCL:Bond order in gaussian



Dear All

I am try to do a bond order analysis with G98.
	Here is my test with O2 molecule.  

#B3LYP/6-31G opt pop=(NBO,Bonding)

HF

0 3
O   0.00 0.00 0.000000
O   0.00 0.00 1.200000

The last lines of the output file is below, and I don't think it is right.
How can I read the table correctly?	And what the LP,RY* stand for?

    Thank you very much for your help!!!!!!!!!!!!!!!!!	
		
 Natural Bond Orbitals (Summary):

                                                     Principal Delocalizations
           NBO              Occupancy    Energy      (geminal,vicinal,remote)
 ===============================================================================
	 Molecular unit  1  (O2)
   1. BD ( 1) O 1- O 2       1.00000    -1.03224
   2. BD ( 2) O 1- O 2       1.00000    -0.45369
   3. BD ( 3) O 1- O 2       1.00000    -0.45369
   4. CR ( 1) O 1            0.99997   -19.14436    12(v)
   5. CR ( 1) O 2            0.99997   -19.14436    8(v)
   6. LP ( 1) O 1            0.99984    -0.87950    12(v)
   7. LP ( 1) O 2            0.99984    -0.87950    8(v)
   8. RY*( 1) O 1            0.00019     0.95747
   9. RY*( 2) O 1            0.00000     0.88719
  10. RY*( 3) O 1            0.00000     0.88719
  11. RY*( 4) O 1            0.00000     1.07773
  12. RY*( 1) O 2            0.00019     0.95747
  13. RY*( 2) O 2            0.00000     0.88719
  14. RY*( 3) O 2            0.00000     0.88719
  15. RY*( 4) O 2            0.00000     1.07773
  16. BD*( 1) O 1- O 2       0.00000     0.26370
  17. BD*( 2) O 1- O 2       0.00000    -0.13403
  18. BD*( 3) O 1- O 2       0.00000    -0.13403
       -------------------------------
              Total Lewis    6.99962  ( 99.9946)
        Valence non-Lewis    0.00000  (  0.0000)
        Rydberg non-Lewis    0.00038  (  0.0054)
       -------------------------------
            Total unit  1    7.00000  (100.0000)
           Charge unit  1    1.00000
	
	

 				
Ding Xunlei
2003-11-05
______________________________________________
Ding Xunlei, Ph.D. Candidate
Open Laboratory of Bond Selective Chemistry
University of Science & Technology of China
Hefei, Anhui 230026, P.R.China
Tel.: 0086-551-3603418
Fax.: 0086-551-3602969
E-mail: dxl^at^mail.ustc.edu.cn
Http://www.bsc.ustc.edu.cn/~dxl

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From chemistry-request@ccl.net Wed Nov  5 20:24:01 2003
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Subject: build amyloid peptide by hand--problem in peptide bond!!!
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Dear all,


I was trying to build a amyloid peptide with the builder module in Insight2, the sequence is 
DAEFR---HDSGY---EVHHQ---KLVFF---AEDVG---SNKGA---IIGLM---VGGVV---IAT
 
What I am confused is: as we all know, there are two hydrogens on the amino group, and if I choose different hydrogen to form the peptide bond with the carboxylic acid group from the previous amino acids, I will have different structure, one is quite global, and another is quite linear.
 
what I really what to know is, since the amino acids is not symmetrical, the two hydrogens must be different to construct the secondary structure, shall I just select the two hydrogens randomly or shall I select a particular hydrogen? the peptide might choose the structure which has the lowest energy, but the problem is, since there are so many amino acids, there will be too many possibilities, how can I know which one is right?
 
can anyone tell me what is the truth in real protein? 

does any one have similiar experience before? i mean build a peptide chain by hand?  


thank you very much in deed!!
 
best regards
 
Ru-Zhen



Best regards. 

Ru-Zhen,Li
r.li)at(qmul.ac.uk
2003-11-06




From chemistry-request@ccl.net Wed Nov  5 21:36:04 2003
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Hi again,

On Mon, 3 Nov 2003, Robert Duke wrote:

> reciprocal force computation.  I would like to see a 92K atom benchmark with
> 8 A cutoffs in which you all get 10 nsec/day on 1024 processors at EPCC

Me too.  Stay tuned (but no promises).

> (;-}).  I presumed you all were actually using the larger cutoff to
> compensate for errors associated with the use of a multi-timestep approach

The main limitation on impulse-based multiple timestepping is a non-linear
resonance at half the highest frequency normal mode of the molecule, or
about 5 fs.  This can be higher if you constrain bonds to hydrogens.  If
you're really picky about energy conservation there are other resonances,
but the energy drift is very slight.  One can also use very light Langevin
damping to erase these effects.

> for PME, or simply because using a larger timestep would make the simulation
> scale better, though perhaps have worse low-end performance.  I have never

The apoa1 benchmark started as a cutoff benchmark and had PME added later.
If there is a consensus among the CHARMM and AMBER communities that 8A is
sufficient with PME, then NAMD users can run with 8A.  The effect of
cutoff on NAMD scaling is that there is more work, but there are also
fewer spatial domains to distribute.  For example, apoa1 with 12A cutoff
has only 6x6x4=144 domains, while your FIX (thanks!) at 8A has 11x7x6=462
domains.  These cancel each other out somewhat.

> seen it to be necessary to use such a large cutoff, and indeed pmemd and
> sander 6/7 would have more trouble with really large cutoffs because they
> use pairlists.  We used a 1.5 fs step for both the PME and direct force

NAMD 2.5 uses pairlists, but only 256MB of memory for a 92K atom system
with a 12A cutoff, and the pairlist data is distributed in parallel runs.
You can also turn pairlists off if you're short on memory.

> parts of the calculation, which gives us good results, even with highly
> ionic systems (the FIX benchmark is for a protein with
> gamma-carboxyglutamates and Ca++'s all over the place; the system is from
> published work).

It is a nice benchmark (thanks again).  I hope you can make it public.

> Well, lets do apples and apples on your favorite machine, lemieux, which
> NAMD has been optimized for, and which PMEMD has NOT been optimized for
> (stock mpi; no fancy attempts to structure the code to the machine
> architecture or compiler; in fact I do not know the machine well at all and
> have limited access).  Over the weekend I ran a series of benchmarks on
> lemieux on the JAC benchmark which you referenced below.  I deviated from
> the exact benchmark specification in two inconsequential ways: 1) I did 4000
> step simulations to get more accurate times, and 2) I used a "skinnb" of 1.0
> instead of 2.0.  PMEMD and Sander 6/7 by default check for atom movement
> exceeding the skin, so the skinnb parameter is an optimization parameter,
> and PMEMD does better with it set to 1.0 (ie., this in no way affects
> results of the simulation, PMEMD just builds smaller lists more frequently).

I've just done the same with the NAMD 2.5 released binary.  NAMD 2.5
dynamically adjusts pairlistdist (and temporarily and locally disables
pairlists in the case of a violation), so I started it at 10A (9A cutoff).
This is the time on Lemeiux from the last 1000 steps of a 4000 step run,
using the direct Elan implementation of Charm++ and the "+strategy
USE_MESH" command line option:

 nodes  procs   time (s)

   1      4     222.122
   2      8     115.277
   4     16      59.4164
   8     32      34.3925
  16     64      22.2451
  32    128      12.8739
  64    256       9.90325

I'll leave your data below for comparison.  The first surprise is that for
such different programs (FORTRAN 90 vs C++) the 4 processor times are
shockingly similar, and the race is tied up to 64 processors.  However,
NAMD continues scaling up to 128 processors, at which point we hit the
frustrating 10ms/step barrier.  I've skipped the academic exercise of
running fewer processors per node, and this isn't the right forum to
discuss the fundamental limits of the machine (SC 2003 in two weeks is).
For NAMD the 50% mark is at about 128 CPUs.

> JAC Benchmark, 23558 atoms on lemieux.psc.edu, results in wall clock seconds
> per 1000 steps.
>
> #cpu   #nodes   PMEMD 3.1 wc sec    NAMD 2.4 wc sec   PMEMD/NAMD speedup
>
>     1            1          828.5         1385              1.67x
>     2            1          431.5          750              1.74x
>     4            1          218.25         390              1.79x
>     8            2          118.5          198              1.67x
>   16            4            67.25         105              1.56x
>   32            8            37             61              1.65x
>   64          16            22.25           40              1.80x
>   72          24            19              nd              nd
>   96          32            17.75           nd              nd
> 120          40            18.75            nd              nd
> 128          32            22               23              1.05

In any case, competition is healthy and PMEMD is certainly a worthy and
welcome competitor for NAMD.

Stay tuned to CCL for NAMD FIX benchmark results on the HPCx (EPCC) SP.

-Jim



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Steve,

I don't think this is possible with Gaussian, but I remember trying a noninteger nuclear charge in GAMESS(US), and I think it was accepted by the program.  

Good luck finding basis sets for Z = 7.5! ;-)

--David Shobe, Ph.D., M.L.S.
S|d-Chemie, Inc.
phone (502) 634-7409
fax (502) 634-7724

Don't bother flaming me: I'm behind a firewall.


-----Original Message-----
From: Computational Chemistry List [mailto:chemistry-request{at}ccl.net]On
Behalf Of Steve Williams
Sent: Wednesday, November 05, 2003 12:41 PM
To: CHEMISTRY{at}ccl.net
Subject: CCL:fractional nuclear charge


I have a colleague who would like to some quantum chemistry calculations on 
the following system: R-OH+  --> R-NH, that is, a smooth transition from an 
open shell alcohol radical cation to a neutral radical amide.  Is there a 
way to do this?  We discussed several options, based on what we have here:
1) Is there and IOP in G98 that would allow a particular nucleus to have a 
fractional charge so that a series of calculations he could gradually go 
> from Z=7 to Z=8?
2) If not, how hard would this be to do with a program where we can play 
with the source code, like GAMESS or perhaps NWCHEM?
3) Is there existing code out there that already does this?
Thanks,
Steve


Steve Williams
A. R. Smith Department of Chemistry
Appalachian State University
Boone, NC 28608
USA
828-262-2965



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From chemistry-request@ccl.net Wed Nov  5 19:32:34 2003
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  CCL'ers:
    Thanks so much for the quick replies.  I have the system working =
now.
  Some who wrote me asked questions like, Was I logged in as root?, and =
did I have the SMP Kernel loaded?
  Also some thought that LINDA was needed to run 2 processors on a =
"parallel" job.  This is not the case however.
  The answer was simply to balance the "bytes" read into shmmax with the =
%mem=3D line in the input file.
  So for my 512 Mb total memory and 2 processors, the suggestion was to =
put 2/3 of available memory as shared memory.  So 340 Mb is 356515840 =
bytes.
=20
  This is done with echo "356515840" >/proc/sys/kernel/shmmax.
=20
  I ran a test job of an OPT on the N1-H deprotonated cytosine cation =
with B3LYP/6-31+G(d) which took 3 hours and 18 minutes with a single =
processor and 1 hour 51 minutes with %Nproc=3D2. That's 1.78 times =
faster.
=20
  I thank everyone who help out with this.
  Regards, Dave Close.
=20

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<div class=3DSection1>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 =
</span>CCL&#8217;ers:<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0=A0=A0 =
</span>Thanks so much for
the quick replies.<span style=3D'mso-spacerun:yes'>=A0 </span>I have the =
system
working now.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>Some who =
wrote me asked
questions like, Was I logged in as root?, and did I have the SMP Kernel =
loaded?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>Also some =
thought
that LINDA was needed to run 2 processors on a &#8220;parallel&#8221; =
job.<span
style=3D'mso-spacerun:yes'>=A0 </span>This is not the case =
however.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>The =
answer was
simply to balance the &#8220;bytes&#8221; read into shmmax with the =
%mem=3D line
in the input file.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>So for my =
512 Mb
total memory and 2 processors, the suggestion was to put 2/3 of =
available
memory as shared memory.<span style=3D'mso-spacerun:yes'>=A0 </span>So =
340 Mb is
356515840 bytes.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>This is =
done with
echo &#8220;356515840&#8221; =
&gt;/proc/sys/kernel/shmmax.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>I ran a =
test job of
an OPT on the N1-H deprotonated cytosine cation with B3LYP/6-31+G(d) =
which took
3 hours and 18 minutes with a single processor and 1 hour 51 minutes =
with %Nproc=3D2.
That&#8217;s 1.78 times faster.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>I thank =
everyone who
help out with this.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><span style=3D'mso-spacerun:yes'>=A0 </span>Regards, =
Dave Close.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

</div>

</body>

</html>
=00
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From chemistry-request@ccl.net Thu Nov  6 10:31:09 2003
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Date: Thu, 6 Nov 2003 10:17:03 -0500 (EST)
From: Rene Fournier - 1999-07-07 <renef!at!yorku.ca>
X-Sender: renef!at!mountain.chem.yorku.ca
To: Mikael Johansson <mpjohans!at!pcu.helsinki.fi>
cc: Steve Williams <willsd!at!appstate.edu>, CHEMISTRY!at!ccl.net
Subject: Re: CCL:fractional nuclear charge
In-Reply-To: <Pine.OSF.4.58.0311061127390.340302!at!soul.helsinki.fi>
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Hello Steve, Mikael, Everyone:

As Mikael wrote, with fractional nuclear charges...

>The basis set might be a problem, as they are optimised for specific
>atoms.

   I totally agree.

>I guess one way of getting around this would be to use a combined
>basis set for the metamorphosing atom, consisting of the BS of both
>the initial (O) and the final (N) atoms.

I am afraid this might give problems with near linear dependencies,
maybe inacurrate inversion of the overlap matrix.  A way around that
problem would be to define an "intermediate basis set" by interpolating
two (preferably large) O and N basis sets that have the same contraction
pattern, ie, a "metamorphosing basis set for a metamorphosing atom".


I have a related question: does anyone know of a program that would
allow to use positive charge distributions other than a set of point
charges, for instance, a set of spherical Gaussian distributions. 


-- Rene
------------------------------------------
|   Rene Fournier, Associate Professor   |
|   Chemistry Dpt, York University       |
|   4700 Keele Street,  Toronto          |
|   Ontario, CANADA   M3J 1P3            |
------------------------------------------


From chemistry-request@ccl.net Thu Nov  6 10:19:08 2003
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From: Christoph Steinbeck <c.steinbeck.-at-.uni-koeln.de>
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We are pleased to announce the release of version 1.0 of our open
access, open submission, open source NMR database NMRShiftDB.
The database lives on http://www.nmrshiftdb.org and can be accessed via
a web interface.
The software and database content can be downloaded via
http://www.sourceforge.net/projects/nmrshiftdb.

NMRShiftDB allows for searching for (sub-)spectra, (sub-)structures and
other properties (chemical names, measurement conditions, keywords), and
last not least 13C spectrum prediction based on the database content.
Currently, the database contains about 5300 structures and about 6000
assigned spectra.

We very much welcome contributions of datasets or any other type of
collaboration. Please note that due to our open content model, there is
no danger of seeing your datasets vanish behind any virtual or real
walls. The current and future content of NMRShiftDB is and will always
be downloadable via the above URL together with the software to make
them searchable. Thus, anyone is capable (and cordially invited) to
create his or her own NMRShiftDB mirror.
Feel free to contact the author of this mail, if you are interested.
A technical paper on the database has just appeared in J. Chem. Inf.
Comput. Sci, ASAP section, http://dx.doi.org/10.1021/ci0341363

Cheers,

Christoph Steinbeck
-- 
Dr. Christoph Steinbeck (e-mail: c.steinbeck.-at-.uni-koeln.de)
Groupleader Junior Research Group for Applied Bioinformatics
Cologne University BioInformatics Center (http://www.cubic.uni-koeln.de)
Z|lpicher Str. 47, 50674 Cologne
Tel: +49(0)221-470-7426   Fax: +49 (0) 221-470-7786

What is man but that lofty spirit - that sense of enterprise.
... Kirk, "I, Mudd," stardate 4513.3..




From chemistry-request@ccl.net Thu Nov  6 10:14:46 2003
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From: Joey Harriman <s808o.-at-.unb.ca>
To: CCL posting <chemistry.-at-.ccl.net>
Subject: clustering database molecules
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Hi,

I am trying to cluster a database of a tetrapeptide with different geometries.  I am
currently using MOE and have tried varying fingerprints (at the 99%) threshold with no
success.  Does anyone have a good system for clustering different geometries of the
same molecule from a database?  Thanks in advance for any help you can offer.

Joey

----------------------------------
Joey Harriman
MSc Computational Chemistry
University of New Brunswick
Room 228
Toole Hall
s808o.-at-.unb.ca
476-6543
----------------------------------


From chemistry-request@ccl.net Thu Nov  6 11:53:56 2003
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Hello Rene, Steve, and All!

On Thu, 6 Nov 2003, Rene Fournier - 1999-07-07 wrote:

> I am afraid this might give problems with near linear dependencies,
> maybe inacurrate inversion of the overlap matrix.  A way around that
> problem would be to define an "intermediate basis set" by interpolating
> two (preferably large) O and N basis sets that have the same contraction
> pattern, ie, a "metamorphosing basis set for a metamorphosing atom".

Just for fun, I tested a metamorphose of CH4 => C/NH4^{+1/2) => NH4^+,
with a combined C+N TZVP basis set for C/N. It had no convergence
problems at all, converging in 8-10 steps (PBE0 functional). Of course,
it could get more difficult with larger molecules, and a morphed basis
could be preferable.

To Steve: I suffer from imagination-malfunction today; could you please
give a hint on what information is gained from such a calculation :-)

Have a nice day,
    Mikael J.
    http://www.helsinki.fi/~mpjohans/

From chemistry-request@ccl.net Thu Nov  6 11:17:07 2003
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On Thu, 6 Nov 2003, Rene Fournier - 1999-07-07 wrote:
> I have a related question: does anyone know of a program that would
> allow to use positive charge distributions other than a set of point
> charges, for instance, a set of spherical Gaussian distributions.

ADF will support an arbitrary external potential, as long as you are
willing to write a routine calculating the potential at grid points.

Serguei

---
Dr. Serguei Patchkovskii

Tel: +1-(613)-990-0945
Fax: +1-(613)-947-2838
E-mail: Serguei.Patchkovskii^at^nrc.ca

Coordinator of Modelling Software
Theory and Computation Group
Steacie Institute for Molecular Sciences
National Research Council Canada
Room 2011, 100 Sussex Drive
Ottawa, Ontario
K1A 0R6 Canada




From chemistry-request@ccl.net Thu Nov  6 10:41:21 2003
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Subject: Re: CCL:PMEMD 3.1 Release - High Scalability Update to PMEMD
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Jim -
All I can say is WOW!!!  That is really fantastic scaling on the JAC
benchmark (I have deleted all but the benchmark data in the copy of your
mail below).  I am actually very impressed by two things in NAMD 2.5, based
on this benchmark.  First, there is the clearly superior high end scaling; I
think you all have bested your previous (2.4) high end scaling performance
by something like a factor of 2.  Second, you all have basically also
doubled the performance relative to NAMD 2.4 at the low processor count.  I
had previously had great respect for your scaling, but had considered that
you all were not paying enough attention to performance on small numbers of
processors.  Not any more.  This small numbers of processors performance
issue is really very important; lots of folks out there have to do their
runs on 4-16 cpu's.  So right now, I suspect you all have the scaling title,
and also about equal performance at the low end.  My first reaction to the
scaling was "it must be the elan optimizations on lemieux".  However, on
second thought, more is going on, based on my current understanding of your
architecture.  With your concept of cycles, you manage to make complete
exchange of coordinates occur less frequently (once every 20 steps by
default, I think).  I do complete exchange of coordinates at pairlist
builds, which is typically once every 4 to 7 steps.  I guess I see a clear
direction for PMEMD 3.11.  Stay tuned.  I think this is currently a very
healthy competition, and users of both products will benefit.  I need to
check with Lalith and Lee, but presumably we can make the FIX benchmark more
public.  Congratulations again to the NAMD 2.5 team on a job well done!
Regards - Bob

----- Original Message -----
From: "Jim Phillips" <jim)at(ks.uiuc.edu>
To: "Robert Duke" <rduke)at(email.unc.edu>
Cc: <chemistry)at(ccl.net>
Sent: Wednesday, November 05, 2003 9:35 PM
Subject: CCL:PMEMD 3.1 Release - High Scalability Update to PMEMD

< other stuff deleted>


> I've just done the same with the NAMD 2.5 released binary.  NAMD 2.5
> dynamically adjusts pairlistdist (and temporarily and locally disables
> pairlists in the case of a violation), so I started it at 10A (9A cutoff).
> This is the time on Lemeiux from the last 1000 steps of a 4000 step run,
> using the direct Elan implementation of Charm++ and the "+strategy
> USE_MESH" command line option:
>
>  nodes  procs   time (s)
>
>    1      4     222.122
>    2      8     115.277
>    4     16      59.4164
>    8     32      34.3925
>   16     64      22.2451
>   32    128      12.8739
>   64    256       9.90325
>
> I'll leave your data below for comparison.  The first surprise is that for
> such different programs (FORTRAN 90 vs C++) the 4 processor times are
> shockingly similar, and the race is tied up to 64 processors.  However,
> NAMD continues scaling up to 128 processors, at which point we hit the
> frustrating 10ms/step barrier.  I've skipped the academic exercise of
> running fewer processors per node, and this isn't the right forum to
> discuss the fundamental limits of the machine (SC 2003 in two weeks is).
> For NAMD the 50% mark is at about 128 CPUs.
>
> > JAC Benchmark, 23558 atoms on lemieux.psc.edu, results in wall clock
seconds
> > per 1000 steps.
> >
> > #cpu   #nodes   PMEMD 3.1 wc sec    NAMD 2.4 wc sec   PMEMD/NAMD speedup
> >
> >     1            1          828.5         1385              1.67x
> >     2            1          431.5          750              1.74x
> >     4            1          218.25         390              1.79x
> >     8            2          118.5          198              1.67x
> >   16            4            67.25         105              1.56x
> >   32            8            37             61              1.65x
> >   64          16            22.25           40              1.80x
> >   72          24            19              nd              nd
> >   96          32            17.75           nd              nd
> > 120          40            18.75            nd              nd
> > 128          32            22               23              1.05
>
> In any case, competition is healthy and PMEMD is certainly a worthy and
> welcome competitor for NAMD.
>
> Stay tuned to CCL for NAMD FIX benchmark results on the HPCx (EPCC) SP.
>
> -Jim
>
>
>
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From chemistry-request@ccl.net Thu Nov  6 11:41:31 2003
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Hello Joey,

I'm working with MOE and have used MOE:Similarity to cluster similar conformations. Our molecules are semi-peptidic macrocycles (about 40-50 atoms) and thus should be somewhat similar to your system. I've had success using Typed Atom Triangles (3D fingerprints) with a Tanimoto coefficient of 90%. Unfortunately, MOE:Similarity does not really cluster and/or does not make the results in a transferable data format such as to obtain the results without repetitively manually creating new files. I therefore proceeded in creating a script that uses MOE:Similarity to report the number of different families, the number of similar conformers within a family, export the separated families into new databases, and can even pipe the whole thing to population analyses. I only came up with a Tanimoto coefficient of 90% by trial and error (my modified scripts helped of course) obviously dependant on my definition of a cluster and what defines a new family. So, I suggest you do the same thing ...

Say HI to Ghislain Deslongchamps, Rod Cooper, and Larry Calhoun for me ... ;O)

Axel


-----Original Message-----
From: Joey Harriman [mailto:s808o)at(unb.ca] 
Sent: 6 novembre, 2003 10:14
To: CCL posting
Subject: CCL:clustering database molecules

Hi,

I am trying to cluster a database of a tetrapeptide with different geometries.  I am
currently using MOE and have tried varying fingerprints (at the 99%) threshold with no
success.  Does anyone have a good system for clustering different geometries of the
same molecule from a database?  Thanks in advance for any help you can offer.

Joey

----------------------------------
Joey Harriman
MSc Computational Chemistry
University of New Brunswick
Room 228
Toole Hall
s808o)at(unb.ca
476-6543
----------------------------------


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From chemistry-request@ccl.net Thu Nov  6 12:29:20 2003
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Date: Thu, 6 Nov 2003 12:28:44 -0500
From: Lee Woodcock <hlwoodc!at!helix.nih.gov>
To: Rene Fournier - 1999-07-07 <renef!at!yorku.ca>
cc: Mikael Johansson <mpjohans!at!pcu.helsinki.fi>,
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On Thu, 6 Nov 2003, Rene Fournier - 1999-07-07 wrote:

>
>I have a related question: does anyone know of a program that would
>allow to use positive charge distributions other than a set of point
>charges, for instance, a set of spherical Gaussian distributions.
>

Gamess-Uk does this. Take a look at the following article...

Optimization of quantum mechanical molecular mechanical partitioning
schemes: Gaussian delocalization of molecular mechanical charges and the
double link atom method, JOURNAL OF CHEMICAL PHYSICS, Volume 117, Issue 23,
15 Dec. 2003, Pages 10534-10547, Das D, Eurenius, KP, Billings, EM,
Sherwood, P, Chatfield, DC, Hodoscek, M, Brooks, BR

Cheers,
Lee Woodcock, Ph.D.
---------------
hlwood!at!nih.gov
---------------


From chemistry-request@ccl.net Thu Nov  6 10:56:20 2003
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From: Alessandro Contini <alessandro.contini!at!unimi.it>
Subject: summary mp2/cc-pvtz
To: chemistry!at!ccl.net
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Hi,
I'd like to thanks Marcel Swart, Stephen Garrison, Olga Dmitrenko and
Giovanni Scalmani for the kind reply.
The problem as suggested was derived by a "out of disk" or "out of memory"
error (the famous -1); however I could not solve it because the disk
requested for my system was 280GB and more for a semidirect and at least
25GB of memory for a direct optimization. However the calculation run
properly with B3LYP/cc-pvtz, B3LYP/tzvp and B3LYP/6-311+G(2d,p) basis.

Thanks again

Alessandro Contini

Alessandro Contini, Ph.D.
Istituto di Chimica Organica "Alessandro Marchesini"
Universit` degli Studi di Milano, Facolt` di Farmacia
Via Venezian, 21 20133 Milano
Tel. +390250314480 Fax. +390250314476
e-mail alessandro.contini!at!unimi.it




From chemistry-request@ccl.net Thu Nov  6 12:35:28 2003
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From: "Pablo Vitoria" <qibvigap..at..lg.ehu.es>
To: "Close, David M." <CLOSED..at..mail.etsu.edu>, "CCL" <CHEMISTRY..at..ccl.net>
References: <C5FA5FEED6F0884E9EB90BB3C010F1EF016051F2..at..etsuex1.etsu.edu>
Subject: Re: CCL:Dual Xeon G98 Summary
Date: Thu, 6 Nov 2003 18:34:49 +0100
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Dear Dave,

I am sorry I didn't answer before, I guess I missed your previos =
message.

The command  "echo "356515840" >/proc/sys/kernel/shmmax" is fine and it =
works, but you will have to enter it after every restart of the =
computer. In Mandrake (that's what I use, but I guess is the same in =
other distros) I would add a line like:

kernel.shmmax=3D356515840

to the file /etc/sysctl.conf, so that it's read at every restart of the =
machine.

Best regards

Pablo
--------------------------------------------------------
Pablo Vitoria Garcia
Dpto. Qu=EDmica Inorg=E1nica, Facultad de Ciencias
Universidad del Pa=EDs Vasco (UPV/EHU)
Aptdo. 644
48080 Bilbao (Bizkaia)

Tfno. 94 6015992
Fax. 94 4648500
  ----- Original Message -----=20
  From: Close, David M.=20
  To: chemistry..at..ccl.net=20
  Sent: Thursday, November 06, 2003 1:32 AM
  Subject: CCL:Dual Xeon G98 Summary


    CCL'ers:

      Thanks so much for the quick replies.  I have the system working =
now.

    Some who wrote me asked questions like, Was I logged in as root?, =
and did I have the SMP Kernel loaded?

    Also some thought that LINDA was needed to run 2 processors on a =
"parallel" job.  This is not the case however.

    The answer was simply to balance the "bytes" read into shmmax with =
the %mem=3D line in the input file.

    So for my 512 Mb total memory and 2 processors, the suggestion was =
to put 2/3 of available memory as shared memory.  So 340 Mb is 356515840 =
bytes.

  =20

    This is done with echo "356515840" >/proc/sys/kernel/shmmax.

  =20

    I ran a test job of an OPT on the N1-H deprotonated cytosine cation =
with B3LYP/6-31+G(d) which took 3 hours and 18 minutes with a single =
processor and 1 hour 51 minutes with %Nproc=3D2. That's 1.78 times =
faster.

  =20

    I thank everyone who help out with this.

    Regards, Dave Close.

  =20

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<DIV><FONT face=3DArial size=3D2>Dear Dave,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I am sorry I didn't answer before, I =
guess I missed=20
your previos message.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The command &nbsp;"echo =93356515840=94 =

&gt;/proc/sys/kernel/shmmax" is fine and it works, but you will have to =
enter it=20
after every restart of the computer. In Mandrake (that's what I use, but =
I guess=20
is the same in other distros) I would add a line like:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>kernel.shmmax=3D356515840</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>to the file /etc/sysctl.conf, so that =
it's read at=20
every restart of the machine.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Best regards</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Pablo</FONT></DIV>
<DIV>--------------------------------------------------------<BR>Pablo =
Vitoria=20
Garcia<BR>Dpto. Qu=EDmica Inorg=E1nica, Facultad de =
Ciencias<BR>Universidad del Pa=EDs=20
Vasco (UPV/EHU)<BR>Aptdo. 644<BR>48080 Bilbao (Bizkaia)</DIV>
<DIV>&nbsp;</DIV>
<DIV>Tfno. 94 6015992<BR>Fax. 94 4648500</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DCLOSED..at..mail.etsu.edu =
href=3D"mailto:CLOSED..at..mail.etsu.edu">Close, David=20
  M.</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dchemistry..at..ccl.net=20
  href=3D"mailto:chemistry..at..ccl.net">chemistry..at..ccl.net</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, November 06, =
2003 1:32=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> CCL:Dual Xeon G98 =
Summary</DIV>
  <DIV><BR></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; =
</SPAN>CCL=92ers:<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>Thanks so much =
for the=20
  quick replies.<SPAN style=3D"mso-spacerun: yes">&nbsp; </SPAN>I have =
the system=20
  working now.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>Some who wrote me asked =
questions=20
  like, Was I logged in as root?, and did I have the SMP Kernel=20
  loaded?<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>Also some thought that LINDA =
was=20
  needed to run 2 processors on a =93parallel=94 job.<SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>This is not the case=20
  however.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>The answer was simply to =
balance the=20
  =93bytes=94 read into shmmax with the %mem=3D line in the input=20
  file.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>So for my 512 Mb total =
memory and 2=20
  processors, the suggestion was to put 2/3 of available memory as =
shared=20
  memory.<SPAN style=3D"mso-spacerun: yes">&nbsp; </SPAN>So 340 Mb is =
356515840=20
  bytes.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>This is done with echo =
=93356515840=94=20
  &gt;/proc/sys/kernel/shmmax.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>I ran a test job of an OPT =
on the N1-H=20
  deprotonated cytosine cation with B3LYP/6-31+G(d) which took 3 hours =
and 18=20
  minutes with a single processor and 1 hour 51 minutes with %Nproc=3D2. =
That=92s=20
  1.78 times faster.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>I thank everyone who help =
out with=20
  this.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
  style=3D"mso-spacerun: yes">&nbsp; </SPAN>Regards, Dave=20
  Close.<o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTM=
L>

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From chemistry-request@ccl.net Thu Nov  6 15:08:16 2003
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From: "Connie Chang" <cc236(at)cornell.edu>
To: <chemistry(at)ccl.net>
Subject: CCL: Gaussian03 DFT Freq error
Date: Thu, 6 Nov 2003 20:07:36 -0500
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Hi :

I am using Gaussian03 for a 72 atom molecule, DFT with this route
#BLYP 6-21G SCF=3D(MaxCyc=3D2000) Opt Freq Test

The optimization completed, but the frequency job ends early with this =
error:
What does the error mean and how can I correct it?


 Requested convergence on RMS density matrix=3D1.00D-08 within2000 =
cycles.
 Requested convergence on MAX density matrix=3D1.00D-06.
 Requested convergence on             energy=3D1.00D-06.
 No special actions if energy rises.
 SCF Done:  E(RB-LYP) =3D  -2739.18562154     A.U. after    1 cycles
             Convg  =3D    0.6724D-09             -V/T =3D  2.0052
             S**2   =3D   0.0000
 Range of M.O.s used for correlation:     1   648
 NBasis=3D   648 NAE=3D   216 NBE=3D   216 NFC=3D     0 NFV=3D     0
 NROrb=3D    648 NOA=3D   216 NOB=3D   216 NVA=3D   432 NVB=3D   432

 **** Warning!!: The smallest alpha delta epsilon is  0.22458850D-01

 Write error in NtrExt1


THanks,

COnnie

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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi :</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I am using Gaussian03 for a 72 atom =
molecule, DFT=20
with this route</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>#BLYP 6-21G SCF=3D(MaxCyc=3D2000) Opt =
Freq=20
Test</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The optimization completed, but the =
frequency job=20
ends early with this error:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>What does the error mean and how can I =
correct=20
it?</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;Requested convergence on RMS =
density=20
matrix=3D1.00D-08 within2000 cycles.<BR>&nbsp;Requested convergence on =
MAX density=20
matrix=3D1.00D-06.<BR>&nbsp;Requested convergence=20
on&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;=20
energy=3D1.00D-06.<BR>&nbsp;No special actions if energy =
rises.<BR>&nbsp;SCF=20
Done:&nbsp; E(RB-LYP) =3D&nbsp; -2739.18562154&nbsp;&nbsp;&nbsp;&nbsp; =
A.U.=20
after&nbsp;&nbsp;&nbsp; 1=20
cycles<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;=20
Convg&nbsp; =3D&nbsp;&nbsp;&nbsp;=20
0.6724D-09&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;=20
-V/T =3D&nbsp;=20
2.0052<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;=20
S**2&nbsp;&nbsp; =3D&nbsp;&nbsp; 0.0000<BR>&nbsp;Range of M.O.s used for =

correlation:&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;=20
648<BR>&nbsp;NBasis=3D&nbsp;&nbsp; 648 NAE=3D&nbsp;&nbsp; 216 =
NBE=3D&nbsp;&nbsp; 216=20
NFC=3D&nbsp;&nbsp;&nbsp;&nbsp; 0 NFV=3D&nbsp;&nbsp;&nbsp;&nbsp;=20
0<BR>&nbsp;NROrb=3D&nbsp;&nbsp;&nbsp; 648 NOA=3D&nbsp;&nbsp; 216 =
NOB=3D&nbsp;&nbsp;=20
216 NVA=3D&nbsp;&nbsp; 432 NVB=3D&nbsp;&nbsp; 432</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;**** Warning!!: The smallest =
alpha delta=20
epsilon is&nbsp; 0.22458850D-01</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>&nbsp;Write error in =
NtrExt1</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>THanks,</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>COnnie</FONT></DIV></BODY></HTML>

------=_NextPart_000_0005_01C3A4A1.9F7CEC00--



From chemistry-request@ccl.net Thu Nov  6 17:11:16 2003
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Date: Fri, 07 Nov 2003 01:07:13 +0300
From: Dmitry Rozmanov <dima(at)xenon.spb.ru>
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Subject: good molecular builder
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Hello.

Could anyone suggest a convenient molecular builder. My task is, say, I 
have optimized geometry for water and nitric anion. Then I want to 
compose a system using their geometries with cation, anion and 10 waters.

It is enough if it saves xyz file. In fact it is preferably.

Any suggestions? Everything I saw either shows molecules or offer 
building but from the very scratch.

Thank you all in advance.

Regards.

	---Dmitry.




