Cyanine
Mostrando 1-12 de 52 artigos, teses e dissertações.
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1. Synthesis, absorption and fluorescence spectral characteristics of trinucleus dimethine cyanine dyes as fluorescent probes for DNA detection
Neste trabalho descreve-se a preparação de seis corantes cianina dimetina trinucleares com núcleos de piridina, obtidos a partir da condensação de iodeto de trimetilpiridínio com aldeídos aromáticos heterocíclicos. As propriedades de absorção e fluorescência dos corantes foram estudadas em solventes com polaridades diferentes. O deslocamento hips
Journal of the Brazilian Chemical Society. Publicado em: 2011-01
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2. Spectrophotometric determination of catecholamine using vanadium and eriochrome cyanine r
A highly sensitive spectrophotometric method for the analysis of catecholamine drugs; L-dopa and methyldopa, is described. The analysis is based on the reaction of drug molecules with vanadium (V) which is reduced to vanadium (IV) and form complex with eriochrome cyanine R to give products having maximum absorbance (lmax) at 565 nm. Beer's law is obeyed in t
Química Nova. Publicado em: 2011
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3. Desenvolvimento, caracterizacao e aplicacao da matriz FTO/POLI(3-aminofenol) na deteccao de marcador de lesao cardiaca por fotoluminescencia de quantum dots
The heart is a vital organ propelling blood, that carries oxygen and nutrients throughout the body, but whenever these components do not reach it due to arterial obstruction, there is an electrical instability in the process of contraction of the muscle, causing arrhythmias that often, in less than an hour, causes acute myocardial infarction. The problem and
Publicado em: 2011
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4. Oclusão de pares iônicos em espaços interlamelares como ferramenta para formação de híbridos luminescentes baseados em V IND. 2 O IND. 5 e MoO IND. 3 / Interlayer occlusion of ion pairs as tool for the production of V2O5 and MoO3-based luminescent materials
In the first part of this work, novel hybrid materials were developed by insertion of poly(diallymethylammonium chloride) PDDA and poly(allylamine hydrochloride) PAH polyelectrolytes into V2O5 and MoO3 interlayer spaces using hydrothermal treatment. A systematic study of the synthesis of hybrids materials by direct in situ reaction of PDDA and PAH polycation
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2010
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5. Prevalence of human papillomavirus (HPV) and HPV-16 genotyping by real-time PCR in patients with several cervical pathologies
PURPOSE: this study was planned to evaluate the prevalence of HPV (excepting type 16) and HPV 16 by real-time PCR in colposcopy patients and to interprete the results with age, age of first sexual intercourse (FSI), parity and Pap smear results. METHODS: one hundred and two colposcopy patients (50 and 52 of the patients were classified as colposcopy positive
Brazilian Journal of Infectious Diseases. Publicado em: 2010-02
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6. Synthèse et caractérisation de molécules organiques qui émettent dans la région du rouge
Lors de ce projet il a été synthétisé et caractérisé photophysiquement des dérivés de colorant fluorescent des cyanines Cy5, symétriques et asymétriques, qui ont l'absorption et l’émission dans le rouge. Ces molécules on été obtenues en 3 étapes, à savoir : la synthèse du dérivé propylidène (étape 1), quaternisation d’indole (étape
Publicado em: 2010
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7. Caracterização das monocamadas mistas (DPPC+BCD) de Langmuir: efeito da estrutura e concentração do BCD e da força iônica na subfase / Characterization of (DPPC+BCD) Langmuir mixed monolayers: effects of BCD structure and concentration and ionic strengths in subphase
Neste trabalho foram estudadas as interações entre os corantes ciânicos com dois cromóforos (BCD) e monocamadas de Langmuir de fosfolipídio (DPPC). Devido ao alto coeficiente de absorção molar da luz na região ? >600 nm, ao alto rendimento quântico do estado tripleto, à alta fotocitotoxicidade e à alta afinidade com estruturas celulares os BCD sã
Publicado em: 2009
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8. Effects of environment, micelles and DNA interactions on the spectroscopies characteristics of bichromophoric cyanine dyes. / Efeitos do meio e da interação com DNA e Micelas nas características espectrais dos corantes ciânicos com dois cromóforos
A terapia fotodinâmica (PDT) consiste em introduzir no organismo um composto fotoativo (fotossensibilizador) e irradiar o local a ser tratado com a luz visível. Este procedimento permite obter a(s) forma(s) ativa(s) do composto que tem a capacidade de matar células neoplásicas, bem como fungos e bactérias. Algumas desvantagens dos fotossensibilizadores
Publicado em: 2007
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9. Association of indopolymethine cyanine cations with anions of sulfonephthalein and xanthene dyes in water
A associação do corante catiônico indoeptametinocianina com vários corantes aniônicos (quatro sulfonaftaleínas e cinco xantinas) em solução aquosa foi investigada usando espectroscopia de absorção no visível. Os valores das constantes de associação estão na faixa de 10(4) a 7 × 10(7) mol-1 L. Em todos os casos, um efeito hipocrômico significa
Journal of the Brazilian Chemical Society. Publicado em: 2005-04
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10. Estudo das características espectroscópicas dos corantes ciânicos com dois cromóforos na interação com DNA: efeitos da força iônica. / Spectroscopic studies of bichromophoric cyanine dyes (BCD) in their interaction with DNA: effect of ionic strength.
Cancer is a pathology responsible for a great number of deaths. The conventional methods of treatment, chemotherapy and radiotherapy, are not always efficient, and multiple side effects are intrinsic for these therapies. In early 70s appeared a new method called Photodynamic Therapy (PDT), that shows few side effects as compared with conventional thera
Publicado em: 2002
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11. Groove-binding unsymmetrical cyanine dyes for staining of DNA: syntheses and characterization of the DNA-binding
Two new crescent-shaped unsymmetrical cyanine dyes have been synthesised and their interactions with DNA have been investigated by different spectroscopic methods. These dyes are analogues to a minor groove binding unsymmetrical cyanine dye, BEBO, recently reported by us. In this dye, the structure of the known intercalating cyanine dye BO was extended with
Oxford University Press.
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12. Inhibition of Tau Polymerization with a Cyanine Dye in Two Distinct Model Systems*
In a host of neurodegenerative diseases Tau, a microtubule-associated protein, aggregates into insoluble lesions within neurons. Previous studies have utilized cyanine dyes as Tau aggregation inhibitors in vitro. Herein we utilize cyanine dye 3,3′-diethyl-9-methyl-thiacarbocyanine iodide (C11) to modulate Tau polymerization in two model systems, an organot
American Society for Biochemistry and Molecular Biology.