Results 341 to 350 of about 3,071,234 (393)
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HRMS studies on the fragmentation pathways of metallapentalyne
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2015The electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) using collision-induced dissociation (CID) method was applied to investigate the characteristic fragment ions of metalla-aromatic complexes for the first time.
Zhiwei, Lin, Congqing, Zhu, Haiping, Xia
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Investigation of fragmentation pathways of protonated 2‐methoxypyrimidine derivatives
Journal of Mass Spectrometry, 2022AbstractSeveral representative pyrimidine derivatives were selected to undergo electrospray ionization (ESI) followed by collision‐induced dissociation tandem mass spectrometry (CID MS/MS) experiments. Two competitive pathways were found to govern the formation of major fragment ions from protonated species of these molecules. The pathways were largely
Chengli Zu +4 more
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Biology of Reproduction, 2019
Understanding and control of the massive and accelerated follicular growth that occurs during in vitro culture of ovarian tissue is a crucial step toward the development of efficient culture systems that offer an attractive alternative to ovarian tissue ...
M. Devos, J. Grosbois, I. Demeestere
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Understanding and control of the massive and accelerated follicular growth that occurs during in vitro culture of ovarian tissue is a crucial step toward the development of efficient culture systems that offer an attractive alternative to ovarian tissue ...
M. Devos, J. Grosbois, I. Demeestere
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o-Benzyne fragmentation and isomerization pathways: a CASPT2 study
Phys. Chem. Chem. Phys., 2014The mechanism for the thermal fragmentation of o-benzyne to C4H2 + C2H2 and C6H2.
GHIGO, Giovanni +2 more
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Mass spectroscopic fragmentation pathways of 1,8‐nonadiyne
Organic Mass Spectrometry, 1985AbstractCleavage α to triple bonds in straight‐chain hydrocabons with only one triple bond is a very minor process. The mass spectrum of 1,8‐nonadiyne (mol. wt 120) shows strong peaks at around m/z91, which points to a major fragmentation pathway of cleavage α to triple bonds in straight‐chain diynes.
Ronny Charles Robbins +1 more
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Fragmentation pathways of diphenyl ether radical cations
International Journal of Mass Spectrometry, 2015Abstract The fragmentation pattern of diphenyl ether (DPE) for both non-resonant and resonant multiphotoionization conditions was obtained. The competition between the processes leading to mass-to-charge ratios m/z 142 and m/z 77 was analyzed. The appearance energies, obtained in this work for the rearrangement and cleavage fragmentation channels ...
M. Guerra, M.H. Cabral, A.C.S. Paiva
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Negative‐ion fragmentation pathways in 2,4,6‐trinitrotoluene
Organic Mass Spectrometry, 1993AbstractThe mass spectrum of 2,4,6‐trinitrotoluene vapour in air was recorded and the negative‐ion fragmentation pathways of the molecular anion were investigated down to the fourth generation. The dissociation of the parent anion led to the production of three fragment anions with masses 46, 197 and 210 u where the last two daughter ions initiated two
M. L. Langford, J. F. J. Todd
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Palliative care in dementia: a fragmented pathway?
International Journal of Palliative Nursing, 2018Background: Most deaths occur in people over the age of 65 years, yet there is widespread evidence that older people have inequitable access to good palliative and end-of-life care. For people with dementia, there are further barriers to receiving palliative care.
Karen Harrison, Dening +2 more
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Mass Spectral Fragmentation Pathways in 1,3,3-Trinitroazetidine
Journal of Mass Spectrometry, 1997The electron impact (EI) fragmentation pathways of 1,3,3-trinitroazetidine (TNAZ) along with some 15N and 2H analogs were studied. Collision-induced dissociation was also used to investigate important peaks in the EI spectra. Isotopically labeled compounds allowed the determination of most of the major fragmentation peaks.
Zheng, Weiyi +4 more
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EXCLI Journal : Experimental and Clinical Sciences, 2019
Piperine (1-piperoylpeperdine), a nitrogenous pungent substance, is present in the fruits of black pepper (Piper nigrum Linn.) and long pepper (Piper longum Linn.). It possesses several pharmacological properties and has been extensively explored for its
A. Jafri +7 more
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Piperine (1-piperoylpeperdine), a nitrogenous pungent substance, is present in the fruits of black pepper (Piper nigrum Linn.) and long pepper (Piper longum Linn.). It possesses several pharmacological properties and has been extensively explored for its
A. Jafri +7 more
semanticscholar +1 more source