Photochemistry Synthesis
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. "Photo" Chemistry Without Light?
In the early seventies, Giuseppe Cilento (São Paulo University), Emil White (Johns Hopkins University) and Angelo Lamola (AT&T Bell Laboratories) postulated that typical photochemical reactions could occur in dark parts of living organisms if coupled to enzymatic sources of electronically excited products. Their paradoxical hypothesis of "photochemistry wit
J. Braz. Chem. Soc.. Publicado em: 2015-12
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2. Obtenção e caracterização de ftalocianinas com substituintes quirais com potencial aplicação em terapia fotodinâmica / Synthesis and characterization ofphthalocyanines with chiralsubstituints with potencialfor use in Photodynamic Therapy
The main objective of this project is the synthesis and characterization of new phthalocyanines with chiral substituents to improve their photophysical and photochemical properties for use as photosensitizers in Photodynamic Therapy. Three new phthalocyanines were synthesized and characterized, one with the racemic mixture of 1-(4-bromophenyl)- ethanol, and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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3. New catalysts based on oxovanadium (IV) and cucurbit[6]uril. / Novos catalisadores à base de oxovanádio (IV) e Cucurbit[6]urila
Cucurbiturils are versatile molecules used in several branches of chemistry. These molecular cages form a family of homologues from the condensation of glycoluril and formaldehyde in acidic medium. Their applications range from catalysis, photochemistry, organic and inorganic synthesis, materials and supramolecular chemistry. Particularly cucurbit[6]uril, or
Publicado em: 2009
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4. Synthesis and study of photoinduced properties of phenothiazine derivatives on biomimetic systems / Síntese e estudo das propriedades fotoinduzidas de derivados fenotiazínicos em sistemas biomiméticos
The effect of interfaces on photophysical and photochemical properties of methylene blue (MB) and its derivatives was studied in this work, aiming to emploit their potencial as photosensitizers (PS) in photodynamic therapy.The presence of MB in SDS solutions affect the micelle equilibrium decreasing the apparent critical micelle concentration of SDS from 7mm
Publicado em: 2008
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5. Studies of the reaction media of polyaniline and poly-o-toluidine synthesis / Estudos do meio reacional da síntese de polianilina e poli-o-toluidina
Foram realizadas análises por espectros absorção, fluorescência e excitação para anilina e orto-toluidina em água, com e sem a adição de HCl. Os resultados indicam que as propriedades do meio dependem das concentrações de amina e de HCl, sendo observado principalmente pelos espectros de excitação de fluorescência. Espectros de 1H RMN parecem in
Publicado em: 2007
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6. SÃntese, caracterizaÃÃo e estudo da liberaÃÃo fotoquÃmica de Ãxido nÃtrico por nitrosilo complexos de Ru e Fe e pelo composto [cyclam(NO)4]. / Synthesis, characterization and study of the release nitric oxide photochemistry complex for nitrosilo of Ru and Fe and for the composition [cyclam (IN) 4].
Neste trabalho à apresentada a sÃntese, caracterizaÃÃo e o estudo da liberaÃÃo fotoquÃmica de Ãxido nÃtrico pelos nitrosilo complexos trans-[Fe(cyclam)(NO+)Cl]Cl2 e trans-[Ru(NH3)4L(NO)]Cl3, onde L=Imidazol, Benzoimidazol, CafeÃna e Teofileno, bem como pelo novo composto [cyclam(NO)4]. AtravÃs de uma nova rota sintÃtica, obteve-se o composto tran
Publicado em: 2006
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7. Estudo de propriedades eletricas e caracteristicas fisico-quimicas do polipirrol obtido por sintese fotoquimica
The scientific and technological interest for the conducting polymers has increased for the fact of the possibility aplications in substitute to traditional metals. Emphasize the Polianilin, Politiofen, Poli(p-fenilen) and Polypyrrole and its derivatives. The Polypyrrole (PPy) can be obtained by chemistry synthesis, eletrochemistry and more recendy photochem
Publicado em: 2002
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8. Utilização de endoperóxidos de derivados de naftaleno como fontes químicas de oxigênio singlete em sistemas biológicos
Molecular oxygen, in the first excited state (singlet oxygen, ¹O2), has a substantial reactivity towards electron-rich organic molecules, such as biological targets, including unsaturated fatty acids, proteins, RNA and DNA. Considering the complexity of biological systems and the great variety of reactive species generated by photochemistry, efforts have be
Química Nova. Publicado em: 2000-10
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9. Synthesis of a Bacillus subtilis small, acid-soluble spore protein in Escherichia coli causes cell DNA to assume some characteristics of spore DNA.
Small, acid-soluble proteins (SASP) of the alpha/beta-type are associated with DNA in spores of Bacillus subtilis. Induction of synthesis of alpha/beta-type SASP in Escherichia coli resulted in rapid cessation of DNA synthesis, followed by a halt in RNA and then protein accumulation, although significant mRNA and protein synthesis continued. There was a sign
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10. Temporal regulation and forespore-specific expression of the spore photoproduct lyase gene by sigma-G RNA polymerase during Bacillus subtilis sporulation.
Bacterial spores are highly resistant to killing by UV radiation and exhibit unique DNA photochemistry. UV irradiation of spore DNA results in formation of spore photoproduct (SP), the thymine dimer 5-thyminyl-5,6-dihydrothymine. Repair of SP occurs during germination of Bacillus subtilis spores by two distinct routes, either by the general nucleotide excisi
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11. Factors Associated with Depression of Photosynthetic Quantum Efficiency in Maize at Low Growth Temperature.
The photosynthetic productivity of maize (Zea mays) in temperate regions is often limited by low temperatures. The factors responsible for the sensitivity of photosynthesis in maize to growth at suboptimal temperature were investigated by measuring (a) the quantum yields of CO2 fixation and photosystem II (PSII) photochemistry, (b) the pigments of the xantho
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12. Termination sites of the in vitro nick-translation reaction on DNA that had photoreacted with psoralen.
A double-stranded circular DNA having a single nick at a specific site has been photochemically induced to react with 4'-hydroxymethyl-4,5', 8-trimethylpsoralen (HMT) and used as a substrate for nick-translation with Escherichia coli DNA polymerase I holoenzyme. By using the dideoxy chain-terminating sequencing procedure, it was possible to map the terminati