The positive and negative ion mass spectra of clausmarin A, a naturally occurring tetracyclic conmarin, have been studied. The base peaks in the positive and negative ion spectra correspond to the complementary ions at mlz 143 and mlz 255, respectively, formed by a rearrangement reaction. The fragme
Spectra of positive and negative energies in the linearized NLS problem
β Scribed by S. Cuccagna; D. Pelinovsky; V. Vougalter
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 231 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0010-3640
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## Abstract In this short note, we focus on tyings (constraints that relate multiple degrees of freedom) modelled by means of penalty functions. In contrast to what is commonly thought, it is possible to obtain convergent results when negative penalty parameters are taken. A mathematical proof and
## Abstract The backbone cleavages of 14 sodiated tripeptides of the series GlyβGlyβXxx, where Xxx = Gly, Ala, Val, Leu, Ile, Phe, Tyr, Met, Glu, Pro, Trp, Lys, His and Arg, were studied in a hybrid tandem mass spectrometer. A __C__βterminal __y__βtype ion of the form __y__~1~ + Na + H was noted in
## Abstract 70 eV positive and negative ion mass spectra of a series of copper(II) Schiff base complexes have been obtained consecutively under the same ion source conditions. The characteristic feature of the negative ion spectra is their extreme simplicity relative to the corresponding positive i
## Abstract The backbone cleavages of protonated tripeptide ions of the series GlyβGlyβXxx, where Xxx ο£Ύ Gly, Ala, Val, __d__βLeu, __l__βLeu, Ile, Phe, Tyr, Trp, Pro, Met and Glu, were studied in a hybrid tandem mass spectrometer. __C__βTerminal __y__βtype ions and __N__βterminal __a__β and __b__βty