Photodimerization
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Fotodimerização no estado solido : obtenção e caracterização de substancias ciclobutanicas / Photodimerization on solid state : obtaining and characterization of substances cyclobutanics
A fotodimerização de compostos orgânicos no estado sólido vem sendo utilizada como um método de síntese promissor na obtenção de substâncias ciclobutânicas. Pesquisas recentes relataram as atividades analgésicas e anticancerígenas dessas substâncias. Este trabalho teve como objetivo a obtenção de substâncias ciclobutânicas pelas fotodimeriza
Publicado em: 2008
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2. Even-odd alternation in mass spectrum of thymine and uracil clusters: Evidence of intracluster photodimerization
Multiphoton ionization of thymine and uracil clusters generated by a supersonic molecular beam gave rise to a remarkable alternation of mass spectral intensities between even- and odd-numbered clusters. Such alternation was observed in clusters of up to 30 molecules. Excitation to the two lowest electronically excited states seemed to be a strong prereq
The National Academy of Sciences.
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3. ON THE MECHANISM OF THYMINE PHOTODIMERIZATION
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4. Sensitized photodimerization of thymine in DNA.
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5. Sterochemical features of thymidylyl-photodimerization in the Watson-Crick DNA helix.
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6. Adenine photodimerization in deoxyadenylate sequences: elucidation of the mechanism through structural studies of a major d(ApA) photoproduct.
The mechanism of the photodimerization of adjacent adenine bases on the same strand of DNA has been elucidated by determining the structure of one of the two major photoproducts that are formed by UV irradiation of the deoxydinucleoside monophosphate d(ApA). The photoproduct, denoted d(ApA)*, corresponds to a species of adenine photodimer first described by
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7. Photofootprinting of DNA triplexes.
We have used a photofootprinting assay to study intermolecular and intramolecular DNA triplexes. The assay is based on the fact that the DNA duplex is protected against photodamage (specifically, against the formation of the (6-4) pyrimidine photoproducts) within a triplex structure. We have shown that this is the case for PyPuPu (YRR) as well as PyPuPy (YRY
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8. UV-induced photoproducts of 5-methylcytosine in a DNA sequence context.
In order to detect possible m5C photoproducts, highly purified rat liver DNA-cytosine methyltransferase was used to specifically generate m5C with a radioactive methyl group. When these DNAs were subjected to a large dose (10 kJ/m2) of 254 nm or 302 nm ultraviolet light (UVB) to enhance the yield, two labeled photoproducts were detected and isolated by rever