Photoproducts
Mostrando 1-12 de 210 artigos, teses e dissertações.
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1. Photochemical characteristics of diclofenac and its photodegradation of inclusion complexes with β-cyclodextrins
Diclofenac is one of most frequently detected compounds in the water cycle. In this work, the effect of initial concentration, liquid inclusion complexes with β-Cyclodextrins (β-CDs) on the photodegradation of diclofenac were studied. Six phototransformation products were detected by HPLC chromatograms. UV-absorption spectra of diclofenac and phototransfor
Química Nova. Publicado em: 2012
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2. Estudo comparativo da fotoxicidade das protoporfirinas IX endógena e sintética e seus fotoprodutos contra células malígnas / Comparative study of the phototoxicity of protoporphyrin IX, endogenous and synthetic and their photoproducts against malignant cells
A protoporfirina IX (PpIX) ocupa um lugar especial entre a família das porfirinas devido ao seu importante papel na natureza e diversas aplicações, inclusive em terapia fotodinâmica. Sob ação da luz visível, a PpIX transforma-se em fotoprodutos que podem ser citotóxicos ou fotocitotóxicos, e isto pode, de um lado, aumentar a eficiência do tratament
Publicado em: 2011
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3. FOTODEGRADATION OF PHENOTHIAZINES AND THEIR STRUCTURAL EFFECTS ON NA(+)K(+) - ATPASE: A FLUORESCENCE STUDY / FOTODEGRADAÇÃO DE FENOTIAZINAS E SEUS EFEITOS ESTRUTURAIS SOBRE A NA(+), K(+) - ATPASE: ESTUDO ATRAVÉS DE FLUORESCÊNCIA
Chlorpromazine (CPZ), fluphenazine (FPZ) and trifluoperazine (TFP) are phenothiazine derivatives, which generate photoproducts under UV irradiation. We observed that CPZ develops three fluorescent fotoproducts under different conditions. Promazine (PZ) that forms from the CPZ photolysis. The chlorine loss is one of the main pathways for photoproduct formatio
Publicado em: 2010
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4. Flavins promote changes in the extracellular matrix, signal transduction, antioxidant enzymes and metalloproteinases during osteoblast differentiation / Flavinas promovem mudanças na matriz extracelular, vias de transdução de sinal, enzimas antioxidantes e metaloproteinases durante a diferenciação de osteoblastos
Riboflavin (Rb-Vitamin B2) is the precursor of essential flavocoenzymes, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD). These coenzymes participate in numerous enzymatic processes dependent on electron transfer reactions that occur in energyproducing, biosynthetic, and detoxifying and electron-scavenging pathways. Increase dietary ribofla
Publicado em: 2009
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5. Degradação de poliestirenossulfonato de sódio fotossensibilizada pelo corante QTX / Degradation of poly(styrenesulfonate) photosensitised by QTX dye
The poly(styrenesulfonate) (PSS) photosensitised by 2-hydroxy-3-(3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-N,N,N-trimethyl-1-propanium chloride (QTX) solution degradation mechanism was investigated. Initially, the photodegradation of QTX in aqueous solution was studied. The photoproducts generated photolysis were characterized as being sulfones and sulfoxid
Publicado em: 2009
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6. Estudo das interações entre os fungicidas (carbendazim e fuberidazole) e as partículas de argila em suspensão aquosa. Adsorção, fotofísica e fotoquímica / Study of the interaction between fungicides (carbendazim and fuberidazole) and the clay particles in suspension aqueous. Adsorption, photophysical, photochemical
In the present work, studies on the interaction between the fungicides (carbendazim and fuberidazole) and clay particles in aqueous suspension. It has been studied by isotherm adsorption, UV spectroscopy, emission of fluorescence and X-Ray. The results were fitted according the Langmuir, Freundlich and Dubinin- Radushkevich isotherms indicating a high affini
Publicado em: 2009
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7. Re(I) complexes and TiO2 films in photoinduced molecular devices / Complexos de Re(I) e filmes de TiO2 em dispositivos moleculares fotoinduzidos
The thesis focus on two main topics: characterization of TiO2 films for Dye-sensitized solar cells, DSCs, and investigation on photochemical and photophysical properties of Re(I) polypyridyl complexes. Mesoporous TiO2 films were prepared by sol-gel method and by commercial oxide (P25, Degussa) and were characterized by XRD, SEM, B.E.T. and XPS. Both oxides w
Publicado em: 2009
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8. Estudo da fotooxidação de nanocomposito PP/bentonita / Study on the photo-degradation of PP/Bentonite nanocomposites
The cation exchange of the bentonite and its processing are important factors to the polimeric nanocomposite formulation. The objective of this work was to produce nanocomposites of polypropylene / sodium bentonite and polypropylene / organophilic bentonite through melt intercalation and analyze the degradation produced by ultraviolet irradiation. Cetyl trim
Publicado em: 2008
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9. "Estudos espectroscópicos e citotóxicos do Photogem® fotodegradado e dos fotoprodutos formados pela irradiação com laser" / "Spectroscopics and cytotoxics studies of Photogem® photodegradate and of photoproducts formated by irradiation with laser"
Photodynamic therapy (PDT) is a technique for inducing tumor tissue damage following administration of a drug that can be selectively retained in malignant tissue and produce singlet oxygen when irradiated in adequate wavelengths in the presence of molecular oxygen. Photosensitizers of porphyrin type can be degraded by light (photobleaching), modifying the c
Publicado em: 2006
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10. Glandula harderiana de ratos wistar como modelo para o estudo de efeitos fotodinamicos
The present work shows, experimentally, that the use of harderian glands of Wistar rats for the study of photodynamic applied to the diagnosis (PDD - of the English, Photo Dynamic Diagnosis) and medical treatment is possible (PDT - of the English, Photo Dynamic Therapy). In the case, the photodynamic action has as photo-sensitizer protoporphirin IX (PpIX), a
Publicado em: 2004
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11. Rapid repair kinetics of pyrimidine(6-4)pyrimidone photoproducts in human cells are due to excision rather than conformational change.
UV-induced pyrimidine(6-4)pyrimidone photoproducts in DNA of mammalian cells are apparently repaired much more rapidly than cyclobutane dimers. Since only immunological assays for (6-4) photoproducts have been sensitive enough for repair measurements, it was possible that these apparently rapid repair kinetics reflected a change in physical conformation of a
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12. Ultraviolet-induced mutations in Cockayne syndrome cells are primarily caused by cyclobutane dimer photoproducts while repair of other photoproducts is normal.
We compared the contribution to mutagenesis in Cockayne syndrome (CS) cells of the major class of UV photoproducts, the cyclobutane pyrimidine dimer, to that of other DNA photoproducts by using the mutagenesis shuttle vector pZ189. Lymphoblastoid cell lines from the DNA repair-deficient disorders CS and xeroderma pigmentosum (XP) and a normal line were trans