Characterization of DitA3, the [Fe3S4] ferredoxin of an aromatic ring-hydroxylating dioxygenase from a diterpenoid-degrading microorganism

2006 ◽  
Vol 1764 (9) ◽  
pp. 1462-1469 ◽  
Author(s):  
Manon M.-J. Couture ◽  
Vincent J.J. Martin ◽  
William W. Mohn ◽  
Lindsay D. Eltis
Keyword(s):  
Aromatic Ring ◽  
Degrading Microorganism

scholarly journals Crystallization and preliminary X-ray characterization of the 2,4′-dihydroxyacetophenone dioxygenase fromAlcaligenessp. 4HAP

2014 ◽  
Vol 70 (6) ◽  
pp. 823-826 ◽  
Author(s):  
G. Beaven ◽  
A. Bowyer ◽  
P. Erskine ◽  
S. P. Wood ◽  
A. McCoy ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Formic Acid ◽  
Molecular Oxygen ◽  
Aromatic Ring ◽  
Bond Cleavage ◽  
Its Sequence ◽  
Hydroxybenzoic Acid ◽  
X Ray

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.

Characterization of a polycyclic aromatic ring-hydroxylation dioxygenase from Mycobacterium sp. NJS-P

Chemosphere ◽  
2017 ◽  
Vol 185 ◽  
pp. 67-74 ◽  
Author(s):  
Jun Zeng ◽  
Qinghe Zhu ◽  
Yucheng Wu ◽  
Hong Chen ◽  
Xiangui Lin
Keyword(s):  
Aromatic Ring ◽  
Polycyclic Aromatic ◽  
Ring Hydroxylation

Synthesis and characterization of new materials with pyrrole units and their semiconductor behavior

2016 ◽  
Vol 1819 ◽  
Author(s):  
Olivia Monroy ◽  
Lioudmila Fomina ◽  
Roberto Salcedo
Keyword(s):  
Aromatic Ring ◽  
Aromatic Amines ◽  
Organic Materials ◽  
Theoretical Calculations ◽  
Synthesis And Characterization ◽  
New Materials ◽  
Semiconductor Behavior ◽  
Semiconducting Behavior

ABSTRACTNew organic materials with semiconductor behavior were prepared from diphenyldiacetylene and aromatic amines with withdrawing groups by Reisch-Schulte reaction and characterized by IR, RMN spectroscopy. The obtained materials share the property of having electron withdrawing groups joint to the attached aromatic ring, it seems this feature accounts in large fashion to improve the semiconducting behavior of this kind of substances, this topic was studied by means theoretical calculations and the results are also discussed. The calculations were carried out by means the Gaussian09 software and all the involved species were geometrically optimized.

Concerning the Application of FT-IR to the Study of Coal: A Critical Assessment of Band Assignments and the Application of Spectral Analysis Programs

1981 ◽  
Vol 35 (5) ◽  
pp. 475-485 ◽  
Author(s):  
Paul C. Painter ◽  
Randy W. Snyder ◽  
Michael Starsinic ◽  
Michael M. Coleman ◽  
Deborah W. Kuehn ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Aromatic Ring ◽  
Curve Fitting ◽  
Critical Assessment ◽  
Extinction Coefficients ◽  
Quantitative Measurements ◽  
Ft Ir ◽  
The Relationship

The problems associated with the application of FT-IR to the characterization of coal structure are critically discussed. The controversies concerning band assignments are considered and it is concluded that the strong 1600 cm−1 band can be assigned to an aromatic ring stretching mode that in most coals is intensity enhanced by the presence of phenolic groups. The application of computer routines to the determination of OH and CH groups is considered. Established criteria for curve fitting are applied to the problem. Qualitative identification of functional groups is achieved, but consistent quantitative measurements will require a determination of the relationship between the extinction coefficients of resolved bands.

Isolation and characterization of poly(butylene succinate-co-butylene adipate)-degrading microorganism

2004 ◽  
Vol 97 (2) ◽  
pp. 131-133 ◽  
Author(s):  
Nobuki Hayase ◽  
Hidetoshi Yano ◽  
Emi Kudoh ◽  
Chikara Tsutsumi ◽  
Kazutoshi Ushio ◽  
...  
Keyword(s):  
Butylene Succinate ◽  
Isolation And Characterization ◽  
Degrading Microorganism

Copper-doped alumina-pillared montmorillonites as catalysts for oxidation of toluene and xylenes with hydrogen peroxide

Clay Minerals ◽  
1999 ◽  
Vol 34 (1) ◽  
pp. 79-87 ◽  
Author(s):  
K. Bahranowski ◽  
M. Gąsior ◽  
A. Kielski ◽  
J. Podobiński ◽  
E. M. Serwicka ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Aromatic Ring ◽  
Catalytic Properties ◽  
Physicochemical Characterization ◽  
Methyl Groups ◽  
Significant Activity ◽  
Phase Oxidation ◽  
Pillared Montmorillonites

AbstractCatalytic properties of Cu-doped alumina-pillared montmorillonite samples have been tested in the liquid phase oxidation of toluene, o-, m-, and p-xylene with hydrogen peroxide. The results show that the clay samples possess significant activity for both the oxidation of methyl groups and hydroxylation of the aromatic ring. Physicochemical characterization of the catalysts using XRD, BET, ESR and ICP-AES techniques show that they are porous materials with Cu species located in the interlayer, present either as isolated Cu2+ ions anchored at alumina pillars or as patches of amorphous CuO. The dependence of the overall yields on the amount of Cu dopant is discussed and explained in terms of the catalyst structural properties.

Synthesis and Characterization of New Functional Polystyrenes Containing Tributyltin Carboxylate Moieties Linked to the Aromatic Ring by a Trimethylene Spacer

2007 ◽  
Vol 18 (2) ◽  
pp. 236-245 ◽  
Author(s):  
Luigi Angiolini ◽  
Daniele Caretti ◽  
Elisabetta Salatelli ◽  
Laura Mazzocchetti ◽  
Rudolph Willem ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Synthesis And Characterization
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