Photobleaching
Mostrando 1-12 de 267 artigos, teses e dissertações.
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1. Estrutura e dinâmica de DNA confinado entre membranas lipídicas não-catiônicas. / Structure and dynamics of DNA confined in-between non-cationic lipid membranes.
Um estudo experimental sobre os aspectos estruturais e dinâmicos de um complexo hidratado de fragmentos de DNA (150 pb) e fases lamelares de lipídios zwitteriônicos é apresentado. Variando-se a hidratação, é possível controlar o confinamento imposto por essa matriz hospedeira sobre os nucleotídeos inseridos na camada aquosa. O arranjo supramolecular
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/11/2011
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2. Efeitos fotoinduzidos em vidros e filmes de fosfato de antimônio dopado com chumbo e fosfato de antimônio dopado com cromo / Photoinduced effects in glasses and films of lead doped antimony phosphate and chromium doped antimony phosphate
The present work is about the study of the optical and structure properties of doped antimony phosphate glasses and thin films. The glasses were produced by the melting of precursors [Sb(PO3)3]n + Sb2O3 using PbO and Cr2O3 as dopant at 900 °C in vitreous carbon crucibles, then poured and quickly cooled into steel molds. The vitreous composition are: 20% [Sb
Publicado em: 2010
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3. Development of an optical fluorescence imaging system for medical use / Desenvolvimento de um sistema por imagem de fluorescência óptica para uso médico-odontológico
Optical fluorescence has been applied to several medical areas, as to monitor drug degradation and cancer detection, due to its high sensitivity, simplicity and fast response. Non-invasive and non-destructive assessment of tissues using this technique is very attractive for clinical diagnosis. Hence, the aim of was the development of an optical fluorescence
Publicado em: 2010
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4. X-ray photoinduced effects in glassy films of CuO doped [Sb(PO3)3]n-Sb2O3 system / Estudo dos efeitos fotoinduzidos por Raio-X em filmes vítreos do sistema [Sb(PO3)3]n-Sb2O3 dopados com CuO
The photosensibility to radiation of phosphate glasses is a property that has attracted great interest in the last decades12. In this work, we realized a systematic and comparative study of the photoinduced phenomena through characterization of the doped copper oxide (CuO) (Sb(PO3)3)n-Sb2O3 system films. In this study, we observed the photostructural changes
Publicado em: 2010
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5. Estudo e aplicações de filmes fotosensitivos de vidros óxidos e sulfeto de germânio / Study and applications of oxysulphide sensitive films
Neste trabalho foram estudados os fenômenos fotoinduzidos apresentados pelos filmes oxisulfetos de composição: 90% GeS2 + 10% Ga2 O3. Os filmes foram depositados em substrato de borosilicato pela técnica de evaporação por feixe de elétrons. A partir dos espectros de transmissão, a energia do bandgap, o índice de refração e a espessura foram determ
Publicado em: 2008
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6. STUDY OF THE AGGREGATION AND PHOTOBLEACHING DYNAMIC OF METHYLENE BLUE AND ORTO-TOLUIDINE BLUE AS REGARDS THEIR PHOTODYNAMIC EFFECTIVENESS / Estudo da dinâmica de fotodegradação e agregação das fenotiazinas azul de metileno e azul orto-toluidina com relação à eficiência fotodinâmica
Photodynamic therapy may be a viable alternative to treat localized infections, although to obtain a resourceful clinical application, parameters linked with photodynamic efficiency must be analyzed in order to achieve quantifiable results. The aims of this study were to investigate the aggregation dynamic of the photosensitizers methylene blue and orto-tolu
Publicado em: 2007
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7. "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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8. "Fotodegradação do Photodithazine e citotoxicidade dos fotoprodutos formados após irradiação com laser" / "Photobleaching of Photodithazine and cytotoxicity of photoproduct formation during illumination with laser"
A Terapia Fotodinâmica consiste em uma nova e promissora técnica de diagnóstico e tratamento de tumores malignos. O tratamento se baseia na administração intravenosa de um fotossensibilizador que acumula-se seletivamente em tecido tumoral, sendo a seguir excitado com luz visível gerando espécies tóxicas às células levando-as à morte. Neste trabalh
Publicado em: 2006
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9. Eficencia fotodinamica das protoporfirinas IX de magnesio e zinco
The photodynamic efficiency of protoporphyrin IX (PpIX) and its magnesium (MgPpIX) and zinc (ZnPpIX) derivatives were investigated by comparing the rate of tryptophan (Trp), bovine albumin (BSA) and erythrocytes photoxidation. The solutions of the biomolecules were irradiated with a mercury lamp, for a maximum period of 120 minutes and their photoxidations w
Publicado em: 2003
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10. Estudo da fotodecomposição de corantes xantenicos em matrizes de poli(vinil alcool)
On this thesis the photobleaching reaction rates of some xanthene dyes dissolved on PVA matrices were studied. The photobleaching reaction of the polymer/dye system was monitored by the dye fluorescence emission. The influence of the sample temperature, dye concentration and the presence of oxidizers, reductors and triplet quenchers upon the reaction rates w
Publicado em: 2000
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11. Influence of the triplet excited state on the photobleaching kinetics of fluorescein in microscopy.
The investigation in this report aimed at providing photophysical evidence that the long-lived triplet excited state plays an important role in the non-single-exponential photobleaching kinetics of fluorescein in microscopy. Experiments demonstrated that a thiol-containing reducing agent, mercaptoethylamine (MEA or cysteamine), was the most effective, among
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12. Rapid Intermittent Movement of Axonal Neurofilaments Observed by Fluorescence PhotobleachingV⃞
Observations on naturally occurring gaps in the axonal neurofilament array of cultured neurons have demonstrated that neurofilament polymers move along axons in a rapid, intermittent, and highly asynchronous manner. In contrast, studies on axonal neurofilaments using laser photobleaching have not detected movement. Here, we describe a modified photobleaching
The American Society for Cell Biology.