Communication: Protonation process of formic acid from the ionization and fragmentation of dimers induced by synchrotron radiation in the valence region

The enzyme 2,4′-dihydroxyacetophenone dioxygenase (or DAD) catalyses the conversion of 2,4′-dihydroxyacetophenone to 4-hydroxybenzoic acid and formic acid with the incorporation of molecular oxygen. Whilst the vast majority of dioxygenases cleave within the aromatic ring of the substrate, DAD is very unusual in that it is involved in C—C bond cleavage in a substituent of the aromatic ring. There is evidence that the enzyme is a homotetramer of 20.3 kDa subunits each containing nonhaem iron and its sequence suggests that it belongs to the cupin family of dioxygenases. By the use of limited chymotrypsinolysis, the DAD enzyme fromAlcaligenessp. 4HAP has been crystallized in a form that diffracts synchrotron radiation to a resolution of 2.2 Å.

Download Full-text

Theoretical–Experimental Study of Formic Acid Photofragmentation in the Valence Region

The Journal of Physical Chemistry A ◽

10.1021/jp209259j ◽

2012 ◽

Vol 116 (25) ◽

pp. 6693-6701 ◽

Cited By ~ 5

Author(s):

Manuela S. Arruda ◽

Ricardo R. T. Marinho ◽

Angelo M. Maniero ◽

Maria Suely P. Mundin ◽

Alexandra Mocellin ◽

...

Keyword(s):

Experimental Study ◽

Formic Acid ◽

Valence Region

Download Full-text

Ionization and Fragmentation of Formamide Induced by Synchrotron Radiation in the Valence Region via Photoelectron Photoion Coincidence Measurements and Density Functional Theory Calculations

The Journal of Physical Chemistry A ◽

10.1021/acs.jpca.5b07464 ◽

2015 ◽

Vol 119 (41) ◽

pp. 10300-10308 ◽

Cited By ~ 7

Author(s):

Manuela S. Arruda ◽

Aline Medina ◽

Josenilton N. Sousa ◽

Luiz A. V. Mendes ◽

Ricardo R. T. Marinho ◽

...

Keyword(s):

Density Functional Theory ◽

Synchrotron Radiation ◽

Density Functional ◽

Density Functional Theory Calculations ◽

Functional Theory ◽

Valence Region ◽

Coincidence Measurements

Download Full-text

Single, double, and triple photoionization of molecules using synchrotron radiation

Canadian Journal of Physics ◽

10.1139/p96-121 ◽

1996 ◽

Vol 74 (11-12) ◽

pp. 850-855 ◽

Cited By ~ 1

Author(s):

Toshio Masuoka

Keyword(s):

Carbon Monoxide ◽

Synchrotron Radiation ◽

Kinetic Energy ◽

Kinetic Energy Release ◽

Double Photoionization ◽

Multiply Charged ◽

Valence Region ◽

Dissociation Dynamics ◽

Dissociative Processes

The recent advances concerning production and dissociation dynamics of multiply-charged molecules using synchrotron radiation are discussed with emphasis on dissociative double photoionization in the valence region. In the determination of the ratio of double to single photoionization, both molecular and dissociative processes are properly included. Kinetic-energy release and anisotropic fragmentation in dissociative double photoionization of carbon monoxide are also discussed.

Download Full-text

Direct Observation of Monolayer Zones in Al-wt 4% Cu

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100178823 ◽

1990 ◽

Vol 48 (1) ◽

pp. 14-15

Author(s):

B. Jouffrey ◽

D. Dorignac ◽

A. Bourret

Keyword(s):

Solid Solution ◽

Synchrotron Radiation ◽

Direct Observation ◽

Supersaturated Solid Solution ◽

Original Model ◽

X Ray ◽

Image Position

Since the early works on GP zones and the model independently proposed by Preston and Guinier on the first steps of precipitation in supersaturated solid solution of aluminium containing a few percent of copper, many works have been performed to understand the structure of different stages in the sequence of precipitation.The scheme which is generally admitted can be drawn from a work by Phillips.In their original model Guinier and Preston analysed a GP zone as composed of a single (100) copperrich plane surrounded by aluminum atomic planes with a slightly shorter distance from the original plane than in the solid solution.From X-ray measurements it has also been shown that GP1 zones were not only copper monolayer zones. They could be up to a few atomic planes thick. Different models were proposed by Guinier, Gerold, Toman. Using synchrotron radiation, proposals have been recently made.

Download Full-text