Hi folks. I had an odd occurrence last weekend with iconnmr. A user
submitted a sample for 1H and 13C apt in sample holder 54. The 13C
experiment was quite long; 48000 scans. On Monday the experiments were
finished *but* only 256 scans were done for the 13C experiment and the
user was understandably upset. Even more puzzling is the order in which
samples ran from the iconnmr log. Sample 53 ran, followed by 55 and 56 and
*then* 54 went in, ran the 1H and came out without running the 13C
experiment. Samples 57, 58 .... 8,9 then ran and then 54 went back in to
run the 13C experiment. Huh?
It looks very like someone tampered with the order of things so that
their experiment would run before the long 13C (which is quite possible
since we don't use very secure passwords) but I'm not positive of this and
I don't want to open a can of worms without investigating this fully. We
have no special priority setup for iconnmr ... samples should run
sequentially. So why would the order be 53, 55, 56, 54, 57, 58 .... 9, 54?
Even if someone tampered with iconnmr, perhaps by stopping and restarting
at holder number 55, why would it not continue sequentially? Suppose
that the user for holder 55 did this. Would not the sequence be 55, 56,
57, 58 ....9, 54? I should add that these experiments were running
overnight and it is likely that nobody was in the lab except at the time
when 55 went in (~7:00pm, Friday evening).
So, my question is this: has anyone ever seen iconnmr do things out of
sequence in a similar fashion to the above occurrence? In other words is
there a chance that the software did this or is it more likely that the
software was tampered with? I have never seen this happen in 10+ years of
working with iconnmr and am leaning towards the tampering hypothesis but
...
Dr. Keith Brown
Department of Chemistry/
Saskatchewan Structural Sciences Center
University of Saskatchewan
Saskatoon, Saskatchewan
306-966-1725
http://chem4823.usask.ca/chem112/kbrown.html
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In theory, there is no difference between theory and practice. In practice, there is.
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Received on Fri Oct 18 2013 - 08:03:00 MST