0000000000458144
AUTHOR
Mele A
Gas-phase ion chemistry of protonated melatonin
The gas-phase ion chemistry of protonated melatonin has been investigated by mass spectrometric (MS) techniques involving chemical ionisation, fast atom bombardment and electrospray ionisation. Either naturally- occurring or collision-induced decomposition e-D derivatives obtained by exchange with D(2)O. The analysis of experimental results allows definite pathways for the formation of the ion at m/z 174 to be assigned and sheds some more light on the overall fragmentation pathways. Experiments on labelled derivatives evidenced H-D scrambling processes during fragmentation
DRY LECITHIN REVERSED MICELLES AS BIOMEMBRANE MODELS:INTERACTION WITH VITAMIN E
Chronic hepatitis B in Italy: new features of an old disease--approaching the universal prevalence of hepatitis B e antigen-negative cases and the eradication of hepatitis D infection.
Characteristics of liver cirrhosis in Italy: results from a multicenter national study.
Abstract Background. In 1992, the characteristics of liver cirrhosis in Italy were assessed in a cross-sectional study among 1829 cirrhosis patients attending 21 tertiary centres. Aim. To evaluate the characteristics of cirrhosis patients 9 years later. Patients. A total of 2185 consecutive cirrhosis patients were enrolled over a 6-month period in 79 hospitals located throughout Italy, randomly selected by means of systematic cluster sampling. Results. The main agent associated with cirrhosis was hepatitis C virus, which was found in 69.9% of the patients and was the only etiologic factor in 51.1% of the patients. Hepatitis B surface antigen was present in the serum of 13.0% of the cases (i…