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AbstractAbstract
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8 refs.
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Journal Article
Journal
Radiochemical and Radioanalytical Letters; v. 6(6); p. 327-331
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AbstractAbstract
[en] Inorganic bromide residues and 14C-labelled methylated products (expressed as CH3Br equivalent) in cocoa beans fumigated with [14C]-methyl bromide have been determined by radiometric and chemical methods. Determination of 14C by direct combustion in an oxygen chamber followed by liquid scintillation counting confirmed previous findings with respect to the magnitude, distribution and chemical nature of the residues. Although recovery of added bromide was good, the values of total bromide obtained by the chemical method were only half of those estimated from the total residual 14C-activity. This is attributed to loss of organic (presumably, protein-bound) bromide. In agreement with the total 14C-labelled residue contents, total bromide in shells was 20 times greater than that in nibs. The low levels of residues in the nib (12ppm as CH3Br equivalent, 10ppm Br) and the further reduction of organic residues by roasting suggest that no toxicological and nutritional hazards may be expected from fumigation of cocoa beans with methyl bromide. (author)
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International Atomic Energy Agency, Vienna (Austria). Joint FAO/IAEA Div. of Atomic Energy in Food and Agriculture; Swedish International Development Authority (SIDA), Stockholm; Panel proceedings series; p. 9-14; ISBN 92-0-111576-8;
; 1976; p. 9-14; IAEA; Vienna

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Book
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AbstractAbstract
[en] A fiber-optic sensor system is described for the on-line determination of bromide in spent brine. In this method, the bromide is selectively oxidized to bromine in a flow reactor containing a packed bed of chloramine-T; the optical absorption of the resulting bromine is then used for quantification. The technique exhibits a dynamic range from 20 to 5000 mg l-1 bromide, provides continuous readout, is not affected by the presence of high concentrations of chloride and has a response time of about 2 min. (author). 13 refs.; 8 figs.; 1 tab
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Source
GRANT CHE 90-20631; This work was supported by the National Science Foundation through grant and by Great Lakes Chemical Corp. (USA).
Record Type
Journal Article
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INIS IssueINIS Issue
Logusso, N.A.; Mitta, A.E.A.
Comision Nacional de Energia Atomica, Buenos Aires (Argentina)1971
Comision Nacional de Energia Atomica, Buenos Aires (Argentina)1971
AbstractAbstract
No abstract available
Original Title
Metodo simple para la preparacion de bromosulftaleina 131I
Primary Subject
Source
May 1971; 6 p
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Report
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AbstractAbstract
[en] The photodissociation dynamics of cyclopropyl bromide (C-3H5Br) and cyclobutyl bromide (C4H7Br) at 234 nm was investigated. A two-dimensional photofragment ion-imaging technique coupled with a [2+1] resonance enhanced multiphoton ionization scheme was utilized to obtain speed and angular distributions of the nascent Br(2P3/2) and Br*(2P1/2) atoms. The recoil anisotropies for the Br and Br* channels were measured to be βBr = 0.92 ± 0.03 and βBr* = 1.52 ± 0.04 for C3H5Br and βBr = 1.10 ± 0.03 and βBr* = 1.49 ± 0.05 for C4H7Br. The relative quantum yield for Br was found to be ΦBr = 0.13 ± 0.03 and for C3H5Br and C4H7Br, respectively. The soft radical limit of the impulsive model adequately modeled the related energy partitioning. The nonadiabatic transition probability from the 3A' and 4A' potential energy surfaces was estimated and discussed
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Source
33 refs, 4 figs, 2 tabs
Record Type
Journal Article
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 33(1); p. 143-148

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Wilde, Tineke de; Mertens, Jan; Simunek, Jirka; Sniegowksi, Kristel; Ryckeboer, Jaak; Jaeken, Peter; Springael, Dirk; Spanoghe, Pieter, E-mail: tineke.dewilde@UGent.be2009
AbstractAbstract
[en] Biopurification systems treating pesticide contaminated water are very efficient, however they operate as a black box. Processes inside the system are not yet characterized. To optimize the performance, knowledge of degradation and retention processes needs to be generated. Therefore, displacement experiments were carried out for four pesticides (isoproturon, bentazone, metalaxyl, linuron) in columns containing different organic mixtures. Bromide, isoproturon and bentazone breakthrough curves (BTCs) were well described using the convection-dispersion equation (CDE) and a first-order degradation kinetic approach. Metalaxyl and linuron BTCs were well described using the CDE model expanded with Monod-type kinetics. Freundlich sorption, first-order degradation and Monod kinetics coefficients were fitted to the BTCs. Fitted values of the distribution coefficient Kf,column were much lower than those determined from batch experiments. Based on mobility, pesticides were ranked as: bentazone > metalaxyl - isoproturon > linuron. Based on degradability, pesticides were ranked as: linuron > metalaxyl - isoproturon > bentazone. - Transport of pesticides in column experiments containing organic substrates
Primary Subject
Source
S0269-7491(08)00468-5; Available from http://dx.doi.org/10.1016/j.envpol.2008.09.008; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] Microchip produced by a plastic material such as poly(dimethylsiloxane) (PDMS) has shown a good material of choice since PDMS has good biocompatibility, facile bonding ability, high transparency for UV and fluorescence detection, and is cost-effective for the production. In addition, it is much less fragile compared to quartz or glass, and can be constructed easily by molding or embossing. However, there are several problems associated with PDMS microchips. For example, many organic molecules and biomolecules are easily adsorbed on the PDMS surface due to the nature of hydrophobicity of a PDMS chip. Moreover, this hydrophobicity limits the use of many organic solvents in the buffer except several alcohols. The electrosmotic flow (EOF) produced under high electric field tends to become unstable as a function of time
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Source
17 refs, 2 figs, 1 tab
Record Type
Journal Article
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 25(4); p. 560-562

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Ma Jun; Wang Chunni; Li Yanlong; Li Shirong, E-mail: hyperchaos@lut.cn2007
AbstractAbstract
[en] Evolution of spiral waves in light-sensitive media described with the two variable oregonator model is investigated. The intensity of external illumination is modulated by a weak chaotic signal, which is introduced into the whole system, the additional bromide production is influenced and the dynamics thus changed. The results are confirmed within our numerical simulation and it may give useful information in pattern formation and suppression of spiral waves. It can be an example for anti-control of chaos
Primary Subject
Source
S0960-0779(06)00118-4; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Chaos, Solitons and Fractals; ISSN 0960-0779;
; v. 33(3); p. 965-970

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AbstractAbstract
[en] Selection of the most informative molecular descriptors from the original data set is a key step for development of quantitative structure activity/property relationship models. Recently, mutual information (MI) has gained increasing attention in feature selection problems. This paper presents an effective mutual information-based feature selection approach, named mutual information maximization by replacing collinear variables (MIMRCV), for nonlinear quantitative structure-property relationship models. The proposed variable selection method was applied to three different QSPR datasets, soil degradation half-life of 47 organophosphorus pesticides, GC-MS retention times of 85 volatile organic compounds, and water-to-micellar cetyltrimethylammonium bromide partition coefficients of 62 organic compounds.The obtained results revealed that using MIMRCV as feature selection method improves the predictive quality of the developed models compared to conventional MI based variable selection algorithms
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Secondary Subject
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44 refs, 5 figs, 4 tabs
Record Type
Journal Article
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964;
; v. 33(5); p. 1527-1535

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Pinto, C.F.; Giannini, M.; Paes Leme, A.F.
Proceedings of the 16. RAU: Annual meeting of the LNLS users2006
Proceedings of the 16. RAU: Annual meeting of the LNLS users2006
AbstractAbstract
No abstract available
Primary Subject
Source
Laboratorio Nacional de Luz Sincrotron (LNLS), Campinas, SP (Brazil); 258 p; 2006; p. 112; 16. RAU: Annual meeting of the LNLS users; 16. RAU: Reuniao anual de usuarios do LNLS; Campinas, SP (Brazil); 20-21 Feb 2006; Available from the Library of the Brazilian Nuclear Energy Commission, Rio de Janeiro
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Miscellaneous
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Conference
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