Department of Chemistry, University of Alberta        December  2007
NMR News 2007-04
News and tips from the NMR support group for users of the Varian NMR systems in the Department
Editor: Albin.Otter@ualberta.ca
        http://nmr.chem.ualberta.ca

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.

Contents 

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VNMR to VNMRJ transition: update

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new LINUX data stations: use of CD/DVD writer and USB keys

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new form for sample submission

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FAQ 2007.04-1: zero NOE - how is that possible ?

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 eventually.
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 2D files:

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only VNMRJ is available for data processing (VNMR is not compatible anymore)

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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

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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?  


From the Carlsberg Research Center, Valby, Denmark
(with explicit permission by the authors Bent O. Peterson and Jens . 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 FAQ 98.08-1
: 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 Alberta Ingenuity Center for Carbohydrate Science is gratefully acknowledged.


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