scholarly journals Characterization of the Coral Allene Oxide Synthase Active Site with UV−Visible Absorption, Magnetic Circular Dichroism, and Electron Paramagnetic Resonance Spectroscopy:  Evidence for Tyrosinate Ligation to the Ferric Enzyme Heme Iron†

Biochemistry ◽  
2001 ◽  
Vol 40 (7) ◽  
pp. 2251-2259 ◽  
Author(s):  
Biji D. Abraham ◽  
Masanori Sono ◽  
Olivier Boutaud ◽  
Anthony Shriner ◽  
John H. Dawson ◽  
...  
Keyword(s):  
Magnetic Circular Dichroism ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Heme Iron ◽  
Resonance Spectroscopy ◽  
Allene Oxide ◽  
Visible Absorption ◽  
Paramagnetic Resonance ◽  
Oxide Synthase ◽  
Electron Paramagnetic

scholarly journals Characterization of neutrophilb-type cytochrome in situ by electron paramagnetic resonance spectroscopy

FEBS Letters ◽  
1991 ◽  
Vol 281 (1-2) ◽  
pp. 130-132 ◽  
Author(s):  
Ikuko Ueno ◽  
Satoshi Fujii ◽  
Hiroaki Ohya-Nishiguchi ◽  
Tetsutaro Iizuka ◽  
Shiro Kanegasaki
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Characterization of titanium dopants in sodium alanate by electron paramagnetic resonance spectroscopy

2005 ◽  
Vol 20 (12) ◽  
pp. 3265-3269 ◽  
Author(s):  
Meredith T. Kuba ◽  
Sandra S. Eaton ◽  
Christine Morales ◽  
Craig M. Jensen
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Epr Spectra ◽  
Minor Amount ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Dehydrogenation Kinetics ◽  
Electron Paramagnetic ◽  
Kinetics Of

Electron paramagnetic resonance (EPR) spectra were obtained for samples of Ti-doped NaAlH4 subjected to different numbers of cycles of dehydrogenation/re-hydrogenation. Ti is observed to evolve from its initial Ti(III) state through a series of Ti(0) species during the first 5 cycles. Although the conversion of Ti(III) to Ti(0) occurs much more readily for TiCl3-doped samples than those prepared with TiF3, in both cases the evolution of Ti follows the same sequence that involves 3 distinguishable Ti(0) species and ends in the predominance of the same single Ti(0) species. The spectrum of a sample of NaAlH4 containing 2 mol% of cubic Al3Ti is distinctly different than any of those observed for the Ti(0) species that arise during the hydrogen cycling of the hydride. The major changes in the nature of the predominant Ti species have little if any effect on the dehydrogenation kinetics, which strongly suggests that the profoundly enhanced hydrogen cycling kinetics of Ti-doped NaAlH4 are due to a Ti species present in only a relatively minor amount.

scholarly journals Azotobacter chroococcum 7Fe ferredoxin. Two pH-dependent forms of the reduced 3Fe clusters and its conversion to a 4Fe cluster

1984 ◽  
Vol 224 (1) ◽  
pp. 247-251 ◽  
Author(s):  
S J George ◽  
A J M Richards ◽  
A J Thomson ◽  
M G Yates
Keyword(s):  
Magnetic Circular Dichroism ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Iron Chelator ◽  
Anaerobic Treatment ◽  
Azotobacter Chroococcum ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
High Affinity ◽  
Ph Dependent ◽  
Electron Paramagnetic

Ferredoxin from Azotobacter chroococcum has been studied by low-temperature magnetic-circular-dichroism and electron-paramagnetic-resonance spectroscopy. When aerobically isolated ferredoxin contains a [3Fe-4S] and [4Fe-4S] cluster. Anaerobic treatment with dithionite in the presence of ethanediol reduces the [3Fe-4S] cluster to give two spectroscopically distinct forms RI and RII which are reversibly interconvertible with a pKa approximately 7.5. The higher-pH form, RII, has a high affinity for ferrous ion and converts readily to a [4Fe-4S]1+ cluster, scavenging iron from the medium. The presence of the iron chelator EDTA inhibits this conversion.

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