The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

13C CP MAS NMR study of ureido sugars, derivatives of 2-amino-2-deoxy-beta-D-glucopyranose and dipeptides.

3C CP MAS NMR spectra of solid methyl 3,4,6-tri-O-acetyl-2-deoxy-2-ureido-beta-D-glucopyranosides with dipeptide residues (protected by OMe, OEt or OBz group) were recorded. Broader resonances enabled assignment of carbons linked to nitrogen. Chemical shifts of sugar carbons varied within 2-6 ppm although the acetylated glucose moiety is the same in all compounds. From the six carbonyl groups in the molecule only the resonances of N6-C5=O are shifted by 2.9-8.3 ppm downfield in the spectra of solid compounds, comparing to the solution, indicating that the molecules are linked by NH...O=C5 hydrogen bonds. The C2=O group of ureido bridge is not involved in H-bonding, ester group probably forms intramolecular H-bonds.[1]

References

  1. 13C CP MAS NMR study of ureido sugars, derivatives of 2-amino-2-deoxy-beta-D-glucopyranose and dipeptides. Wawer, I., Piekarska-Bartoszewicz, B., Temeriusz, A., Potrzebowski, M., Ciesielski, W. Solid state nuclear magnetic resonance. (1998) [Pubmed]
 
WikiGenes - Universities