Downfield carbon paired with a upfield proton

4 1 4k
answers votes views
Dear sirs and madams, I have a natural product whose two carbon resoances are appearing at 46 and 56 ppm but theirs prot...
Posted: Jonnala Kotesh Kumar 11 / Updated: nvgramosa 11 Oct 08 '11 at 09:08

peak missing in nh hsqc protein nmr

4 0 17021
answers votes views
Dear NMR wikiers I am assigning 95 aminoacid residue protein . I can see 76 cross peaks in N H HSQC on 700 vnmr cryob ...
Updated: sri 71 Aug 25 '11 at 00:05

Problem with the gradient shimming

4 0 4k
answers votes views
Dear Friends, I've recently encountered a problem with gradient shimming that has never happened to me before. I can't ...
Posted: dkubicki 11 / Updated: Charlie Fry 91 Nov 16 '12 at 09:02

Simple 1H-NMR Assignment Query

4 1 4k
answers votes views
Hi guys, sorry to be really cheeky and sign up simply to ask for help, but here goes. I've done a simple Grignard addit...
Posted: Brianstorm 11 / Updated: 3nath 11 Oct 26 '11 at 12:53

Spectra from BMRB Chemical shifts

4 0 6k
answers votes views
Is it possible to generate a spectrum from BMRB chemical shifts? I want to generate a spectrum to use as a reference fo...
Posted: Andreas 1 / Updated: delaglio 1361 Dec 11 '11 at 14:15

Integrating 13C spectra

4 1 9k
answers votes views
In a normal fully decoupled carbon experiment, can you integrate equivalent carbons? In other words , do all CH3's get ...
Posted: Javaslinger 53 / Updated: w101bdk 7 Jul 16 '12 at 09:49

Difficulties with wobbing.

4 1 3k
answers votes views
Hello, dear NMR-comrades! I work on Bruker AVANCE II 400 MHz NMR-spectrometer and today I had some troubles with wobbi...
Posted: Alexander Abakumov 11 / Updated: Jerry Hirschinger 199 Jul 16 '12 at 07:55

Amplifier problem

4 0 6k
answers votes views
Hi.We have a 500 MHz AVANCE-DRX spectrometer and I have a question about it .How we can understand that the amplifier ha...
Posted: shokoufeh karimnia 1 / Updated: Nonai 1 May 22 '14 at 00:45

lose the lock

4 0 6k
answers votes views
Recently the TOPSPIN always popup a windows "L-TRX board overtemperature error occurs" Then the lock is lost, and the lo...
Updated: Roja 26 Jan 07 '13 at 15:58

Which minimum distance between two magnets?

4 0 7k
answers votes views
Dear all, how do you determine the minimum distance between two high-field magnets? Is it that their 5-gauss lines mus...
Posted: oxy 31 / Updated: John Hollerton 96 Apr 22 '13 at 05:56
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