scholarly journals Low temperature EPR spectroscopic characterization of the interaction of cytochrome P-450cam with a spin label analog of metyrapone.

1982 ◽  
Vol 257 (10) ◽  
pp. 5372-5379
Author(s):  
D M Mock ◽  
G V Bruno ◽  
B W Griffin ◽  
J A Peterson
Keyword(s):  
Low Temperature ◽  
Spin Label ◽  
Spectroscopic Characterization

scholarly journals Electrochemical and spectroscopic characterization of the 7Fe form of ferredoxin III from Desulfovibrio africanus

1989 ◽  
Vol 264 (1) ◽  
pp. 265-273 ◽  
Author(s):  
F A Armstrong ◽  
S J George ◽  
R Cammack ◽  
E C Hatchikian ◽  
A J Thomson
Keyword(s):  
Low Temperature ◽  
Pyrolytic Graphite ◽  
Spectroscopic Characterization ◽  
Carbon Electrode ◽  
Standard Hydrogen Electrode ◽  
Hydrogen Electrode ◽  
Iron Cluster ◽  
Desulfovibrio Gigas ◽  
Acid Labile

Desulfovibrio africanus ferredoxin III is a monomeric protein (Mr 6585) containing seven cysteine residues and 7-8 iron atoms and 6-8 atoms of acid-labile sulphur. It is shown that reversible unmediated electrochemistry of the two iron-sulphur clusters can be obtained by using a pyrolytic-graphite-‘edge’ carbon electrode in the presence of an appropriate aminoglycoside, neomycin or tobramycin, as promoter. Cyclic voltammetry reveals two well-defined reversible waves with E0′ = -140 +/- 10 mV and -410 +/- 5 mV (standard hydrogen electrode) at 2 degrees C. Bulk reduction confirms that each of these corresponds to a one-electron process. Low-temperature e.p.r. and magnetic-c.d. spectroscopy identify the higher-potential redox couple with a cluster of core [3Fe-4S]1+.0 and the lower with a [4Fe-4S]2+.1+ centre. The low-temperature magnetic-c.d. spectra and magnetization properties of the three-iron cluster show that it is essentially identical with that in Desulfovibrio gigas ferredoxin II. We assign cysteine-11, -17 and -51 as ligands of the [3Fe-4S] core and cysteine-21, -41, -44 and -47 to the [4Fe-4S] centre.

Low-temperature and time-resolved spectroscopic characterization of the LOV2 domain of Avena sativa phototropin 1

2004 ◽  
Author(s):  
Magdalena Gauden ◽  
Sean Crosson ◽  
I. H. M. van Stokkum ◽  
Rienk van Grondelle ◽  
Keith Moffat ◽  
...  
Keyword(s):  
Low Temperature ◽  
Avena Sativa ◽  
Spectroscopic Characterization ◽  
Time Resolved

Spectroscopic Characterization of Ion-Implanted GaN

2002 ◽  
Vol 743 ◽  
Author(s):  
L. Chen ◽  
B. J. Skromme
Keyword(s):  
Low Temperature ◽  
High Purity ◽  
Spectroscopic Characterization ◽  
Acceptor Pair ◽  
Donor Acceptor ◽  
Optical Activation ◽  
Donor Acceptor Pair ◽  
Low Temperature Photoluminescence ◽  
Do So

ABSTRACTWe investigate implantation of high purity HVPE GaN with Mg, Be, C, Zn, Cd, Ca, N, O, P, As, Ne, and Ar. After annealing at 1300 °C, the material is characterized using low temperature photoluminescence (PL). The Mg acceptors exhibit much better optical activation than Be, C, Zn, Cd, or Ca acceptors implanted and annealed under the same conditions. Acceptor-bound exciton peaks and well-resolved donor-acceptor pair bands are observed for both Mg and Zn. A broad peak centered near 2.78 eV is obtained for Cd, confirming that it is deeper than Zn. Isoelectronic As or P exhibit sharp no-phonon bound exciton lines at 2.952 and 3.200 eV, respectively. Defect-related bands centered at 2.2 and 2.35 eV are studied. Both Be and C strongly enhance the yellow (2.2 eV) PL band, but no other impurities do so, including O.

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