Flash photolysis and time-resolved mass spectrometry. III. Termolecular and surface recombinations of ground state iodine atoms

1974 ◽  
Vol 78 (9) ◽  
pp. 878-881 ◽  
Author(s):  
Richard T. Meyer
Keyword(s):  
Mass Spectrometry ◽  
Ground State ◽  
Flash Photolysis ◽  
Time Resolved

scholarly journals Measurements of Rate Constants for HO2 + NO and NH2 + NO Reactions by Time-Resolved Photoionization Mass Spectrometry

1995 ◽  
Vol 16 (1) ◽  
pp. 43-51 ◽  
Author(s):  
Takashi Imamura ◽  
Nobuaki Washida
Keyword(s):  
Mass Spectrometry ◽  
Rate Constants ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Absolute Rate ◽  
Time Resolved ◽  
Photoionization Mass Spectrometry

Absolute rate constants for HO2 + NO and NH2 + NO reactions were measured by a photoionization mass spectrometry coupled with a laser flash photolysis. HO2 and NH2 radicals were photoionized by an Ar resonance lamp and were detected as their parent ions (HO2+ and NH2+). The rate constants were determined to be K(HO2 + NO)=(6.5  ± 2.0) 10−12cm3molecule−1s−1K(NH2 + NO)=(1.9  ± 0.3) 10−11cm3molecule−1s−1 Both rates are consistent with those previously reported.

scholarly journals Untargeted histone profiling during naive conversion uncovers conserved modification markers between mouse and human

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Laura De Clerck ◽  
Jasin Taelman ◽  
Mina Popovic ◽  
Sander Willems ◽  
Margot Van der Jeught ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ground State ◽  
Recent Progress ◽  
Embryonic Stem ◽  
Mouse Escs ◽  
Naive Mouse ◽  
Time Resolved ◽  
Post Translational Modifications ◽  
Over Time

AbstractRecent progress has enabled the conversion of primed human embryonic stem cells (hESCs) to the naive state of pluripotency, resembling the well-characterized naive mouse ESCs (mESCs). However, a thorough histone epigenetic characterization of this conversion process is currently lacking, while its likeness to the mouse model has not been clearly established. Here, we profile the histone epigenome of hESCs during conversion in a time-resolved experimental design, using an untargeted mass spectrometry-based approach. In total, 23 histone post-translational modifications (hPTMs) changed significantly over time. H3K27Me3 was the most prominently increasing marker hPTM in naive hESCs. This is in line with previous reports in mouse, prompting us to compare all the shared hPTM fold changes between mouse and human, revealing a set of conserved hPTM markers for the naive state. Principally, we present the first roadmap of the changing human histone epigenome during the conversion of hESCs from the primed to the naive state. This further revealed similarities with mouse, which hint at a conserved mammalian epigenetic signature of the ground state of pluripotency.

Flash Photolysis with Kinetic Mass Spectrometry

1971 ◽  
Vol 49 (12) ◽  
pp. 2048-2052 ◽  
Author(s):  
O. P. Strausz ◽  
S. C. Barton ◽  
W. K. Duholke ◽  
H. E. Gunning ◽  
P. Kebarle
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectrometer ◽  
Half Life ◽  
Flash Photolysis ◽  
Fast Response ◽  
Field Mass ◽  
Time Resolved ◽  
Photolysis Apparatus

A flash photolysis apparatus coupled with a fast response conventional sector field mass spectrometer for the rapid time resolved detection of short-lived neutral transients is described. The utility of the apparatus is illustrated by the detection of the Fe(CO)(NO)3 intermediate with a half-life of ~0.1 s in the flash photolysis of Fe(CO)5 in the presence of NO.

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