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  • 1
    Electronic Resource
    Electronic Resource
    Calculations on high LET radiation tracks (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 150 (1991), S. 3-13 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The use of beams of heavy ions such as carbon, neon and argon for radiation therapy has the advantage that they have a very sharp Bragg maximum. When the Bragg peak coincide with the tumour location, it is possible to deposit the bulk of the energy of the ion in the region occupied by the malignancy. However, the concentration of ions and free radicals will be very high in the Bragg peak region which has not received the attention it deserves. So mutual recombination of these species will be very high. It is therefore necessary to assess the extent of these radical-radical recombinations at very high LET values. Spur diffusion model calculations have been made for high energy argon ions using water as a medium. For comparison, calculations have been done for proton tracks. It has been shown that in the Bragg peak region of argon ions even very high concentrations of scavengers have very little effect on radical-radical interactions. The implication is that when LET values are very high, practically all the radicals undegro recombination with each other. In order to explain the observed lethality of high LET radiation, it is suggested that the hydrogen peroxide formed also contribute to the killing of cells. In addition, the decomposition of H2O2 will contribute oxygen. This may be one of the reasons why high LET radiation shows strong lethality to hypoxic cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041486
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for possible positive hole transport in the biological protein bovine serum albumin (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 171 (1993), S. 443-450 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Using the pulse radiolysis technique, the oxidation of the biological protein bovine serum albumin (BSA) by the species N 3 . , CCl3O 2 . , OH and Br 2 .− has been studied in aqueous solution. The repair of the N 3 . oxidation by ascorbic acid and the effect of denaturing the protein on this repair has also been studied. The oxidation of Br 2 .− seems to follow a different course from that of the other oxidizing agents suggesting the possibility of positive hole mobility in this protein. The repair by ascorbic acid is found more effective in the case of denatured protein. The rate constants for the reaction of Br 2 − and N 3 . are lower, in general, in the case of the denatured protein as compared with the undenatured BSA both at pH 6.9 and pH 10.7, suggesting that the convoluted structure of the protein plays a part in the process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02219868
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  • 3
    Electronic Resource
    Electronic Resource
    Pulse radiolytic study of the triplet excited state of naphthalene in mixed solvents (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 150 (1991), S. 427-433 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The triplet excited state of naphthalene (3N*) has been produced by irradiating solutions of naphthalene in mixtures of isopropanol-formamide, acetonitrile-formamide and N,N-dimethylformamide — formamide mixtures with 2 microsecond electron pulses. The yield and decay kinetics of the triplet have been studied over a wide range of compositions of the mixtures. An attempt has been made to explain the variation in the yields and decay rate constants on the basis of the micro properties of the solvent mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035329
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  • 4
    Electronic Resource
    Electronic Resource
    New chelated complexes of bis-β-carboalkoxyethyltin(IV) dichloride with S-benzyldithiocarbazate Schiff basesN.C.L. Communication No. 5247. (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 69-74 
    Details
    ISSN: 0268-2605
    Keywords: Estertin complexes ; S-benzyldithio-carbazate ; Schiff bases ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Schiff bases [H2SBSaD], [H2SBVD] and [H2SBND], derived by the condensation of S-benzyldithiocarbazate and salicylaldehyde, 2-hydroxy-3-methoxybenzaldehyde and 2-hydroxy-1-naphthaldehyde respectively, react with diestertin dichlorides, R2SnCl2 [R=—CH2CH2CO2CH3, —CH2CH2CO2C2H5 or —CH2CH2CO2C4H9] in 1:1 molar proportion to yield chlorine-substituted complexes of the type R2Sn(Schiff base), the base being tridentate. The complexes are characterized on the basis of their elemental analyses, IR and 1H NMR spectral studies. The 13C and 119Sn NMR and the tin-carbon coupling constant data reveal the structures of the complexes to be octahedral with trans ester grouping, and bidentate ester linkages. The pentacoordinated complex (CH3)2Sn(SBSaD) was prepared by the reaction of dimethyltin oxide with H2SBSaD in equimolar proportions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590060109
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  • 5
    Electronic Resource
    Electronic Resource
    Organotin(IV) complexes of dibasic tridentate Schiff bases containing ONO donor atomsNCL Communication No. 5406 (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 7 (1993), S. 63-69 
    Details
    ISSN: 0268-2605
    Keywords: Organotin Schiff base complexes ; spectroscopic studies ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organotin(IV) Schiff base complexes of the type (L)SnR2 [where R=CH3, C6H5 or CH2CH2CO2 CH3], (LH)Sn(C6H5)3 and (L)SnCl(CH2CH2CO2 CH3) [where LH2=2-N-salicylideneimino-2-methyl-1-propanol, derived from the condensation of salicylaldehyde and 2-amino-2-methyl-1-propanol] have been prepared and characterized on the basis of their elemental analyses, IR, 1H, 13C and 119Sn NMR studies. In these mononuclear complexes the Schiff base acts either as a dianionic tridentate or as a monobasic bidentate moiety by coordinating through an alkoxy group, an azomethine nitrogen and a phenoxide ion to tin. Sulphur dioxide inserts in the tin-methyl/-phenyl bond in the above Schiff base complexes to give tin-O-sulphinates of formulae (L)RSn(SO2R) and (LH)(C6H5)2Sn(SO2C6H5).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590070108
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  • 6
    Electronic Resource
    Electronic Resource
    Reactions of halogenated organic peroxyl radicals with various purine derivatives, tyrosine, and thymine: A pulse radiolysis study (1992)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 24 (1992), S. 1035-1042 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Absolute rate constants for the one electron oxidation of guanine, guanosine, uric acid, xanthine, hypoxanthine, tyrosine, and thymine by various halogenated peroxyl radicals in aqueous solutions have been determined using the technique of pulse radiolysis. Roughly, linear correlations have been observed between the logarithm of these rate constants and Taft's inductive parameter (σ*) for the radicals. However, the rate constants for the radical CBr3O2· are slightly higher than those for CCl3O2· for most of these compounds. © John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550241202
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  • 7
    Electronic Resource
    Electronic Resource
    Micellar catalyzed redox reactions of bilirubin in CTAB medium. A pulse radiolysis study (1994)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 26 (1994), S. 903-912 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of CO2·- with bilirubin which is not detectable in homogeneous aqueous medium proceeds almost with diffusion controlled rate in CTAB micellar system. This could be explained on the basis of catalysis caused by the possible electrostatic surface potential of cationic CTAB Micelles. The rate constant for the oxidation of bilirubin by haloperoxyl radicals have been shown to increase with increasing solvent polarity. Although the polarity effect was small, it followed a trend in the expected direction. Micellar effect was not observed in the oxidation reactions when alcohol was present in high concentration. But a small increase in the rate constant was observed when alcohol concentration was lower. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550260904
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