Department of Chemistry,
University of Alberta December
NMR News 2007-04
News and tips from the NMR support group for users of the Varian NMR systems in the
There are no fixed publishing dates for this newsletter;
its appearance solely depends on whether there is a need to present information to the
users of the spectrometers or not.
Other content of this NMR News is no
longer meaningful and has been removed May 2010.
VNMR to VNMRJ transition: update
Since the last NMR News the VNMR to
VNMRJ transition continued and has nearly reached completion. An updated list of our spectrometers and data
stations with regard to VNMR(J) is posted here. Most
noteworthy is the fact that now 2 of our 3 data stations with general access (d500
and ibdw) are LINUX-based (for more information
see below) while all but one (u500) spectrometer remain
UNIX/Solaris-based which allows the user to either use VNMR or VNMRJ to acquire
and process data on the spectrometer. As mentioned several times before it is a good idea
to familiarize yourself with VNMRJ. The old VNMR "sans-J" will disappear
All our spectrometers and data stations have now dual LCD display (*). It is
very easy to make good use of the extra monitor "real estate" by dragging
windows over to the second desktop (left-click and hold while moving the
window in Linux, left-click and hold and pressing the Alt key on the Sun
computers). Another use is to stretch VNMR(J) over both windows.
New LINUX data stations: use of CD/DVD
writer and USB keys
d500 in WB-13 and ibdw in EB-44
were replaced with modern LINUX-based PCs (*). This has several
consequences besides the obvious fact that they are very fast in processing even large
only VNMRJ is available for data processing
(VNMR is not compatible anymore)
it is now (finally!!) possible to not only burn
CDs but also DVDs, a welcome expansion in capacity from ca. 700 MB to 4.7 GB
also for the first time, USB keys can
be used for data transfers
Two how-to documents have been created to help
with the creation of CD/DVDs
and the use of USB keys.
CD/DVD burning is no longer done in VNMRJ but instead with the LINUX operating
system itself. It is highly recommended to read these instructions (in
PDF format for easy printing). It is your data that may get lost if you
do this incorrectly! Please note that only data stations allow CD/DVD burning.
This is done on purpose to prevent wasting spectrometer time for such tasks. USB
keys do not work on SUN computers even though USB slots are present
(decoration, really, not more).
New form for sample submission
The form that is used to submit NMR samples to the NMR
service labs has been changed to reflect recent changes. Please only use the
new version when
submitting samples. Like the old version, the new form allows you to fill in
some fields with Adobe Acrobat Reader. This free program does not allow to
save the changes, but once you have your name, lab and phone number, research
director entered you can print out the form, photocopy it and save
yourself the trouble to always fill in the same information. The fields that
allow entering information are shaded in light grey. If you have the Adobe Acrobat
Writer (not free), you can save the form with the entered information.
FAQ 2007.04-1: zero NOE - how
is that possible?
Carlsberg Research Center, Valby,
(with explicit permission by the authors Bent O.
Peterson and Jens Ø. Duus)
|Almost every NMR user
knows that the Nuclear Overhauser Effect (NOE) depends on the inverse 6th
power of the distance between protons.
Far less known is the fact that, irrespective of distance, the NOE can be
zero if certain conditions are met. This subject has been discussed as
NOESY, ROESY and TROESY: what is the difference?
In the Figure on the left a different approach
to the same problem is presented. For a more detailed discussion, click on
the image for a PDF file with explanations and a better quality graph.
(*) Financing of the new equipment by the
Ingenuity Center for Carbohydrate Science is gratefully acknowledged.
top of page