Zobrazeno 1 - 10
of 31
pro vyhledávání: '"B, Ambroz"'
Publikováno v:
Radiation Physics and Chemistry. 71:1023-1030
The role of the two principal oxidation states of iron ions in modifying the response of DNA to ionising radiation depends not only on their contrasting redox character but also on their abilities to induce different conformational changes to the hel
Publikováno v:
Radiation Physics and Chemistry. 70:677-686
Studies of the influence of cysteamine on damage to DNA by ionising radiation, using two methods of examination: EPR and gel-electrophoresis under air and oxygen-free conditions, and at cryogenic and ambient temperatures, enabled us to draw some conc
Autor:
Grażyna Przybytniak, Hanna B. Ambroz
Publikováno v:
Progress in Reaction Kinetics and Mechanism. 28:35-56
This review presents a summary of Professor Martyn Symons’ role in radiation studies on the key biopolymer DNA, a contribution that cannot be overestimated. Some of his achievements are revealed, along with his influence on other research performed
Publikováno v:
Radiation Physics and Chemistry. 64:107-113
The effect of a thiol, dithiothreitol (DTT), on DNA radiolysis at cryogenic temperatures was investigated by the EPR method. Dithiothreitol repairs up to 30% of DNA radicals, but an increase in the thiol concentration above 10 mM, even up to 1000 mM,
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 142:9-18
Addition of Fe(III) increases the number of strand breaks of plasmid DNA in aqueous solution under gamma-radiolysis at room temperature and at 77 K. Low temperature radiolysis requires ca. 100 times higher radiation dose for the creation of comparabl
Publikováno v:
Radiation Physics and Chemistry. 58:357-366
A range of drugs in the form of microcrystalline powder was exposed to γ -radiation. EPR measurements proved that all of them contained various paramagnetic species after 4 and 8 weeks of storage. We observed following radical concentrations, stable
Publikováno v:
Radiation Physics and Chemistry. 53:491-499
The γ -radiolysis of frozen aqueous solutions of DNA has been studied by EPR. The effect of transition metal ions Fe(III) and Cu(II) up to 5 mM concentration emerged in lowering of the total radical production in DNA. The loss of 5-thymyl radical TH
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 108:149-153
The triplet ground state of the 3,5-dichloro-aminophenyl cation ( 3 Ar + ), generated by photolysis at 77 K of the parent arenediazonium salt, exhibits the strongest dipolar interaction in its EPR spectrum ( D >0.3 cm −1 ) found so far for any know
Publikováno v:
Journal of Photochemistry and Photobiology A: Chemistry. 68:85-95
The extreme reactivity of the aryl cation is confirmed by the first optical detection of the reversibility of the heterolysis of the diazonium cation at temperatures slightly above 77 K: Seven differently substituted diazonium salts have been found t
Publikováno v:
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry. 39:389-396
The role of matrix effects in radiolysis and photolysis is illustrated using two systems: organosulphur compounds and benzenediazonium salts. Their intermediates as detected by low temperature ESR and optical spectroscopy or FAB-MS give evidence that