Dear Youlin,
I must apologize for giving you bad information. In my replying to quickly
I have given you the wrong numbers. Below are the correct ones so please
correct you chart.
800 Cryoprobe ethyl benzene sino - 8680:1 and the Sucrose is 884:1
800 standard QXI probe is 1809:1 and 380:1
Mike
====================================================
Michael J. Delk
NMR Lab Manager
Structural Biology Program
University of Pittsburgh
B033 Biomedical Science Tower 3
3501 Fifth Avenue
Pittsburgh, PA 15260
412.383.9802 Phone
412.648.9008 Dept. Fax
mid15_at_pitt.edu
-----Original Message-----
From: Youlin Xia [mailto:yxia_at_uh.edu]
Sent: Monday, January 30, 2006 7:18 PM
To: ammrl_at_ammrl.org
Cc: yxia_at_uh.edu; xxie_at_uh.edu; glegge_at_uh.edu
Subject: S/N of CryoProbe
Hello, dear NMR Managers,
In last Saturday, I emailed to AMMRL to know the S/N of CryoProbe. I
obtained quite a few replies. The results are listed in the following table.
Institution
Instrument
S/N
University of Connecticut
Varian 600
4000:1
3M Pharmaceuticals
Bruker 700 TXI
7400:1
University of Pittsburgh
Bruker 800
6036:1
University of Chicago
Varian 600
5100:1
UT-Houston
Bruker 600
4500:1
University of California, Irvine
Bruker 500 TCI
5453:1
University of Houston
Bruker 800 TCI
6400:1
Additionally, a few friends suggested me pay attention to decoupling
experiment, temperature limits, experiments with proteins, et al. Thank you
all so much.
Today the engineer got another number, the S/N of the peak around 5.4 ppm of
Sucrose (2 mM Sucrose with 0.5 mM DSS, 2 mM NaN3 in 10% D2O and 90% H2O),
which is 495:1.
I'm very depressed with this number because the S/N of the same sample with
our room temperature probe TXI is 467:1 although the engineer said he can
boost the S/N to 800:1. Even if the S/N is 800:1, the enhancement is only
1.7-fold. So much money spent is only for the 1.7-fold S/N enhancement?
Please tell me what the S/N is with Sucrose sample in your cryoprobe.
Thanks in advance,
Youlin Xia
Manager NMR Facility
University of Houston
Houston, TX
Received on Wed Feb 01 2006 - 16:14:02 MST