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Tuesday, May 12, 2020 | History

2 edition of Pulse radiolysis of chlorophyll a in solution. found in the catalog.

Pulse radiolysis of chlorophyll a in solution.

Niels Henrik Jensen

Pulse radiolysis of chlorophyll a in solution.

by Niels Henrik Jensen

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  • 7 Currently reading

Published by Forsoegsanlaeg Risoe in Roskilde .
Written in English


Edition Notes

SeriesRisoe-M -- 1914
ContributionsForsoegsanlaeg Risoe. Kemiafdelingen.
The Physical Object
Pagination21 s
Number of Pages21
ID Numbers
Open LibraryOL21676801M
ISBN 108755004474

Pulse radiolysis of aqueous solutions of nitric oxide at neutral pH shows that the reaction initiated by the hydrated electron, e − (aq), proceeds via NO − and a new transient thought to be (N 2 O 2) −, and not HNO as indicated previously by steady state by: @article{osti_, title = {Pulse radiolysis of porphyrin and ferriporphyrin solutions in 2-propanol-carbon tetrachloride systems. Protonation and ligand exchange kinetics}, author = {Brault, D and Neta, P}, abstractNote = {Pulse radiolysis of aqueous and nonaqueous 2-propanol-acetone-carbon tetrachloride mixtures has been investigated by means of conductivity measurements and.

On Friday, Decem AM UTC-6, Ahmed Sheheryar wrote: > NOW YOU CAN DOWNLOAD ANY SOLUTION MANUAL YOU WANT FOR FREE > > just visit: > and click on the required section for solution manuals.   Abstract. This chapter describes pulse radiolysis. Pulse radiolysis uses pulsed particle (mostly electron) beam having the time width in the order of sub-microseconds (10 −6) to sub-picoseconds (10 −12).Typically, it is used for liquid systems, and upon irradiation, short-lived chemical species such as electron, cation, and electronically excited states are formed.

I 1 Applications of Pulse Radiolysis to Imaging Sciences ‘F‘vED Dan Meisel Argonne, IL USA Chemistry Division, Argonne National Laboratory 2 7 19% 3W-I I Abstract Pulse radiolysis has been utilized over the last three decades to study a variety of physical and chemical systems, including those relevant to imaging : D. Meisel. The formation and disappearance of ions have been observed directly by means of pulse radiolysis conductivity measurements. The specific equivalent conductance of C(NO 2) – 3 ions and solvated protons was determined to be Λ C(NO 2) 3 – + H sol + = 51 Ω –1 cm 2 equiv. – by: 8.


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Pulse radiolysis of chlorophyll a in solution by Niels Henrik Jensen Download PDF EPUB FB2

Schematic drawing of a pulse radiolysis setup. The solution to be irradiated is in the cell. The electron beam (coming from the accelerator) is usually perpendicular to the analyzing light beam. The pulse duration is usually nsec long. The sample is contained in a quartz cell ( μ l in our case).

Pulse radiolysis of chlorophyll a in solution By Niels Henrik Jensen Download PDF ( KB)Author: Niels Henrik Jensen. The book covers the principle of pulse radiolysis, identifies various kinds of pulse radiolysis techniques, and discusses recent advancements in the field. The text also discusses new experimental pulse radiolysis techniques (basic and applied) in broad scientific fields such as physics, chemistry, biology, and engineering.

Presents a discussion of the pulse radiolysis technique, one of the important and powerful means for detecting transient and relaxation phenomena and following their behavior in irradiated systems. This book covers the principle of pulse radiolysis, identifies various kinds of pulse radiolysis techniques, and discusses advancements in the field.

Abstract. Pulse radiolysis was developed as a technique for studying fast processes in solution about 20 years after flash photolysis, 1–4. The initial consequences of the absorption of ionising radiation is however quite different to that produced by light (– nm) absorption.

Pulse radiolysis of ethyl propionate in aqueous solution. Journal of Radioanalytical and Nuclear Chemistry Letters(1), DOI: /BF L. Wojnárovits, E. Takács, J. Dobó, G. Földiák. Pulse radiolysis studies on the polymerization of 1,6-hexanediol diacrylate in.

1. Using the method of pulse radiolysis in irradiated aqueous solutions of sulfuric acid, a short-lived optical absorption (maximum at mμ due to the HSO 4 (or SO 4 −) radical has been molar extinction coefficient of this product (∼ liter/mole cm) and the velocity constant of the reaction between the OH radical and the HSO 4 − (or SO 4 2−) ion (∼10 6 liter Cited by: From pulse radiolysis lifetimes of phenol radical cations between and ns are known [4, 9].

Laser photolysis (3 ns, nm up to 15 mJ) of N 2-purged solutions of up to 10 −3 mol dm −3 phenols yields phenoxyl radicals as dominating products (Figure 2).

In the spectrum only a little hint for the phenol radical cations exists. Pulse radiolysis of solutions of alkali metal ethylamides in ethylamine shows the formation of three distinct species; the solvated electron e s −, the alkali metal anion M −, and a species considered to be the cation–electron pair with stoichiometry three species coexist in equilibrium in accord with the equations Studies of these solutions as a function of temperature, alkali Cited by:   After application of a 2-microsecond pulse of an electron beam to aqueous, aerated, acid solutions of KBr, transient spectra of Br2- and Br3- were observed.

The kinetic analysis of the reactions as well as the measured values of G(H2O2), G(Br2), and G(Br3-) revealed a reaction mechanism differing from the one which is accepted for radiolysis at low intensityCited by: The influence of ion pairing on electron scavenging in nitrate solutions and the effect of amines on the enhancement of the electron yield, two particular processes previously observed in positron annihilation (PA) studies on positronium (Ps) formation in methanol, are examined by using picosecond pulse radiolysis.

ICES Techniques in Marine Environmental Sciences, No. 1 1 INTRODUCTION Chlorophyll a is the principal pigment in plants. In converting light energy to chemical energy, it allows photosynthesis, i. The effects of pH and molecular weight on the repair rate have also been studied.

Some further data on the pulse radiolysis of cysteamine solutions, including a determination of the extinction coefficient of the radical-ion RSSR – (ε = ± × 10 3 M –1 cm –1) are by: Pulse radiolysis has been used to measure directly the absolute rates of oxidation by ferricyanide ion of various radicals produced by OH attack on organic solutes.

These include mono, di- and polyhydroxylic compounds, hydroxy acids, polyethylene oxides of molecular weight Cited by: MathWorks does not warrant the accuracy of the text or exercises in this book.

This book’s use or dis- Finite Duration Pulse Signal Periodic Pulse Signal Finite Duration Pulse Train Signal LLC ® ® com-Radar Signal Analysis and Processing Using MATLAB.

The pulse radiolysis apparatus has been described elsewhere.') In the present study reaction cells of 25, 16 and mm path length were used as suited the concentrations of PNDA.

Pulse doses were calibrated against the Fricke dosimeter saturated with oxygen. Neutral solutions Cited by: Lipid peroxyl radical was generated by pulse radiolysis carried out in aerated aqueous solution containing 2 x mol dm-3 linoleic acid.

LH + OH L + H2O L + O2 LOO Thiyl radicals were generated on pulse radiolysis of cystein ( M) in N2O saturated solution.

Formation of cation radicals by pulse radiolysis of metalloporphyrins and chlorophyll a in 1,2-dichloroethane is reported Demetalation of the metalloporphyrin by radiolytically produced HC1 is also observed.

Rate constants for demetalation of ZnTPP and Chl a are 1 1 × 10 8 and ≈ 3 × 10 8 M −1 S − by: Transient spectra observed on the pulse radiolysis of aqueous solutions of nitric oxide at pH have been assigned to the species NO −, N 2 O 2 −, and N 3 O 3 −.In acid solution these species are protonated to form the corresponding acids, HNO, HN 2 O 2, and HN 3 O the basic and acid forms undergo similar reactions, but at different rates, to form the products of radiolysis N 2 Cited by: One-electron oxidation and demetalation of metalloporphyrins and chlorophyll a in dichloroethane solutions as studied by pulse radiolysis Author links open overlay panel Haim Levanon P Cited by:.

The rate constants for the reaction of 1,4-dicyanobenzene with the hydrated electron (k 2 = × 10 10 M –1 s –1), the hydroxyl radical (k 2 = × 10 8 M –1 s –1) and the hydrogen atom (k 2 = × 10 8 M –1 s –1) have been measured together with the spectra and extinction coefficients of the resulting addition of methanol and of oxygen respectively it was possible Cited by: 7.Pulse radiolysis experiments on acetone solutions have confirmed that G(triplet)= In addition the yields G(singlet)= and G(free ions)= have been has been demonstrated that the electron affinity of acetone is intermediate between those of naphthalene and by:   Applications of Pulse Radiolysis to Protein Chemistry - Volume 12 Issue 4 - M.

H. Klapper, M. FaraggiCited by: