Détection des radicaux OH et O–2 issus de la radiolyse de l'eau par chimiluminescence résolue en temps

2001 ◽  
Vol 79 (2) ◽  
pp. 171-175
Author(s):  
V Wasselin-Trupin ◽  
G Baldacchino ◽  
B Hickel
Keyword(s):  
Electron Beam ◽  
Hydroxyl Radical ◽  
Pulse Radiolysis ◽  
Superoxide Radical ◽  
Large Range ◽  
Superoxide Radicals ◽  
New Method ◽  
Water Radiolysis ◽  
Time Resolved ◽  
Low Concentrations

A new method for the detection of low concentrations of hydroxyl and superoxide radicals, formed by water radiolysis, is described in this article. The method used is the time resolved chemiluminescence. It has been performed with an electron beam delivered by a Febetron 707 accelerator. This method allows to measure hydroxyl and superoxide radical concentrations in a large range of concentrations, between 10–5 and 10–8 M.Key words: chemiluminescence, pulse radiolysis, hydroxyl radical, superoxyde radical.[Traduit par la Rédaction]

A New Method for the Measurement of Low Concentrations of OH/O2-Radical Species in Water by High-LET Pulse Radiolysis. A Time-Resolved Chemiluminescence Study

2000 ◽  
Vol 104 (38) ◽  
pp. 8709-8714 ◽  
Author(s):  
V. Wasselin-Trupin ◽  
G. Baldacchino ◽  
S. Bouffard ◽  
E. Balanzat ◽  
M. Gardès-Albert ◽  
...  
Keyword(s):  
Pulse Radiolysis ◽  
New Method ◽  
Radical Species ◽  
Time Resolved ◽  
Low Concentrations ◽  
High Let

scholarly journals Pulsed Electron Beam Water Radiolysis for Submicrosecond Hydroxyl Radical Protein Footprinting

2009 ◽  
Vol 81 (7) ◽  
pp. 2496-2505 ◽  
Author(s):  
Caroline Watson ◽  
Ireneusz Janik ◽  
Tiandi Zhuang ◽  
Olga Charvátová ◽  
Robert J. Woods ◽  
...  
Keyword(s):  
Electron Beam ◽  
Hydroxyl Radical ◽  
Water Radiolysis ◽  
Protein Footprinting ◽  
Pulsed Electron Beam ◽  
Hydroxyl Radical Protein Footprinting

Effect of Some Psychotropic Drugs on Luminol - Dependent Chemiluminescence Induced by O2–, •OH, HOCl

2002 ◽  
Vol 57 (11-12) ◽  
pp. 1066-1071 ◽  
Author(s):  
Vera Hadjimitova ◽  
Trayko Traykov ◽  
Milka Mileva ◽  
Stefan Ribarov
Keyword(s):  
Antioxidant Activity ◽  
Hydroxyl Radical ◽  
Psychotropic Drugs ◽  
Superoxide Radical ◽  
Hypochlorous Acid ◽  
Superoxide Radicals ◽  
Scavenge Activity ◽  
Biologically Relevant

We studied antioxidant activity of six neuroleptics (chlorpromazine, levomepromazine, promethazine, trifluoperazine and thioridazine) and two antidepressants (imipramine and amitriptyline) in the range of concentration of 10−7−10−4 м. We applied luminol-dependent chemiluminescence to test the ability of these drugs to scavenge the biologically relevant oxygen-derived species: hydroxyl radical, superoxide radical, hypochlorous acid in vitro. We found that the phenothiazines were powerful scavengers of hydroxyl and superoxide radicals. Chlorprothixene, amitriptyline and imipramine had no scavenge activity to the superoxide radical. All drugs showed a moderate scavenger effect on hypochloric anion.

Time-resolved spectroscopy of solid poly(1-vinyl naphthalene)following electron beam pulse radiolysis: pulse radiolytic studies on polymers

1982 ◽  
Vol 87 (6) ◽  
pp. 594-598 ◽  
Author(s):  
Daniel R. Coulter ◽  
Ranty H. Liang ◽  
Salvador Di Stefano ◽  
Jovan Moacanin ◽  
Amitava Gupta
Keyword(s):  
Electron Beam ◽  
Pulse Radiolysis ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Electron Beam Pulse

Time-dependent yield of the hydrated electron and the hydroxyl radical in D2O: a picosecond pulse radiolysis study

2018 ◽  
Vol 20 (23) ◽  
pp. 15671-15679 ◽  
Author(s):  
Furong Wang ◽  
Uli Schmidhammer ◽  
Jean-Philippe Larbre ◽  
Zizhao Zong ◽  
Jean-Louis Marignier ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Pulse Radiolysis ◽  
Picosecond Pulse ◽  
Isotopic Effect ◽  
Hydrated Electron ◽  
Time Dependent ◽  
Time Resolved

Picosecond pulse radiolysis measurements were performed in neat D2O and H2O in order to study the isotopic effect on the time-resolved yield of the hydrated electron and hydroxyl radical.

Microtubule nucleation sequence studied by time-resolved x-ray scattering and electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 766-767
Author(s):  
Eva-Maria Mandelkow ◽  
Eckhard Mandelkow ◽  
Joan Bordas
Keyword(s):  
Electron Microscopy ◽  
Dynamic Equilibrium ◽  
Time Resolved ◽  
X Ray ◽  
Additional Information ◽  
X Ray Scattering ◽  
Low Concentrations ◽  
Microtubule Growth ◽  
Ray Patterns ◽  
Ray Scattering

When a solution of microtubule protein is changed from non-polymerising to polymerising conditions (e.g. by temperature jump or mixing with GTP) there is a series of structural transitions preceding microtubule growth. These have been detected by time-resolved X-ray scattering using synchrotron radiation, and they may be classified into pre-nucleation and nucleation events. X-ray patterns are good indicators for the average behavior of the particles in solution, but they are difficult to interpret unless additional information on their structure is available. We therefore studied the assembly process by electron microscopy under conditions approaching those of the X-ray experiment. There are two difficulties in the EM approach: One is that the particles important for assembly are usually small and not very regular and therefore tend to be overlooked. Secondly EM specimens require low concentrations which favor disassembly of the particles one wants to observe since there is a dynamic equilibrium between polymers and subunits.

Electron-beam damage of oxides at high current densities

1989 ◽  
Vol 47 ◽  
pp. 634-635
Author(s):  
M. R. McCartney ◽  
J. K. Weiss ◽  
David J. Smith
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Current Density ◽  
Transition Metal Oxides ◽  
Time Resolved ◽  
Rapid Acquisition ◽  
Resolution Electron ◽  
Current Densities ◽  
Electron Stimulated Desorption ◽  
Channel Analyzer

It is well-known that electron-beam irradiation within the electron microscope can induce a variety of surface reactions. In the particular case of maximally-valent transition-metal oxides (TMO), which are susceptible to electron-stimulated desorption (ESD) of oxygen, it is apparent that the final reduced product depends, amongst other things, upon the ionicity of the original oxide, the energy and current density of the incident electrons, and the residual microscope vacuum. For example, when TMO are irradiated in a high-resolution electron microscope (HREM) at current densities of 5-50 A/cm2, epitaxial layers of the monoxide phase are found. In contrast, when these oxides are exposed to the extreme current density probe of an EM equipped with a field emission gun (FEG), the irradiated area has been reported to develop either holes or regions almost completely depleted of oxygen. ’ In this paper, we describe the responses of three TMO (WO3, V2O5 and TiO2) when irradiated by the focussed probe of a Philips 400ST FEG TEM, also equipped with a Gatan 666 Parallel Electron Energy Loss Spectrometer (P-EELS). The multi-channel analyzer of the spectrometer was modified to take advantage of the extremely rapid acquisition capabilities of the P-EELS to obtain time-resolved spectra of the oxides during the irradiation period. After irradiation, the specimens were immediately removed to a JEM-4000EX HREM for imaging of the damaged regions.

XANES Registration by Electron Beam Position Scanning for Time-Resolved Experiment

1997 ◽  
Vol 7 (C2) ◽  
pp. C2-549-C2-552 ◽  
Author(s):  
S. G. Nikitenko ◽  
B. P. Tolochko ◽  
A. N. Aleshaev ◽  
G. N. Kulipanov ◽  
S. I. Mishnev
Keyword(s):  
Electron Beam ◽  
Time Resolved ◽  
Beam Position

Technical note: A new method for the evaluation of puff dispersion field experiments for the validation of time-resolved dispersion simulations

2019 ◽  
Vol 210 ◽  
pp. 171-176
Author(s):  
Thorsten Wittemeier ◽  
Timothy G. Foat ◽  
Steven Herring ◽  
John S. Shrimpton ◽  
Zheng-Tong Xie
Keyword(s):  
Field Experiments ◽  
Technical Note ◽  
New Method ◽  
Time Resolved

Submicrosecond studies in pulse radiolysis by time-resolved EPR spectroscopy

1975 ◽  
Vol 35 (4) ◽  
pp. 566-568 ◽  
Author(s):  
A.D. Trifunac ◽  
K.W. Johnson ◽  
B.E. Clifft ◽  
R.H. Lowers
Keyword(s):  
Epr Spectroscopy ◽  
Pulse Radiolysis ◽  
Time Resolved
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