Photoprotection
Mostrando 25-36 de 83 artigos, teses e dissertações.
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25. Identificação de flavonoides, quantificação de isovitexina e avaliação das atividades antioxidante e fotoprotetora in vitro dos extratos metanólico e glicólico de Passiflora coccinea (Aubl.) / Identification of flavonoids, quantification of isovitexin and evaluation of antioxidant and photoprotective in vitro activities of methanolic and glycolic Passiflora coccinea (Aubl.) extracts
As espécies do gênero Passiflora são ricas em flavonoides, que apresentam atividade antioxidante e, por isso, têm potencial para uso em formulações que combatam o envelhecimento extrínseco da pele. Esse envelhecimento está ligado à formação de espécies reativas de oxigênio pela absorção da radiação ultravioleta. Neste contexto, formulações
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/05/2012
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26. Preparation of pellets containing Pothomorphe umbellata extracts by extrusion-spheronization: improvement of 4-nerolidylcatechol photostability
Pothomorphe umbellata (L.) Miq., Piperaceae, has been extensively used in Brazilian folk medicine and it is well known for its strong antioxidant properties. However, its main active constituent, 4-nerolydilcatechol (4-NC), is sensitive to ultraviolet and visible light, which can limit the use of intermediate and final herbal preparations of this species. In
Rev. bras. farmacogn.. Publicado em: 06/11/2012
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27. Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation
Gas exchange, chlorophyll afluorescence, and photosynthetic pigments of Xylopia sericeaA. St.-Hil. and Siparuna guianensis Aubl. were evaluated during the rainy season and the dry season (2009-2010) in three understories with different ecological conditions (irradiance, water availability, and temperature) located in the União Biological Reserve (known as R
Braz. J. Plant Physiol.. Publicado em: 2012-06
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28. Growth and biopigment accumulation of cyanobacterium Spirulina platensis at different light intensities and temperature
In order to find out optimum culture condition for algal growth, the effect of light irradiance and temperature on growth rate, biomass composition and pigment production of Spirulina platensis were studied in axenic batch cultures. Growth kinetics of cultures showed a wide range of temperature tolerance from 20 ºC to 40 ºC. Maximum growth rate, cell produ
Brazilian Journal of Microbiology. Publicado em: 2011-09
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29. Growth and accumulation of carotenoids and nitrogen compounds in Gracilaria domingensis (Kütz.) Sonder ex Dickie (Gracilariales, Rhodophyta) cultured under different irradiance and nutrient levels
Effects of the interaction of irradiance and nutrient levels on growth and contents of photosynthetic pigments, carotenoids and proteins in Gracilaria domingensis (Kütz.) Sonder ex Dickie (Gracilariales, Rhodophyta) were investigated experimentally. Nutrient availability provided by dilutions of the nutrient solution of von Stosch (25 and 50%, which corresp
Revista Brasileira de Farmacognosia. Publicado em: 13/05/2011
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30. Putative benefits of microalgal astaxanthin on exercise and human health
Astaxanthin (ASTA) is a pinkish-orange carotenoid produced by microalgae, but also commonly found in shrimp, lobster and salmon, which accumulate ASTA from the aquatic food chain. Numerous studies have addressed the benefits of ASTA for human health, including the inhibition of LDL oxidation, UV-photoprotection and prophylaxis of bacterial stomach ulcers. AS
Revista Brasileira de Farmacognosia. Publicado em: 22/04/2011
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31. Photoprotection of Gracilaria tenuistipitata (Rhodophyta): a physiological and molecular approach / Fotoproteção em Gracilaria tenuistipitata (Rhodophyta): uma abordagem fisiológica e molecular
A alga vermelha Gracilaria tenuistipitata tem sido utilizada como matéria prima para a produção de ágar e também como modelo para estudos fisiológicos e moleculares. Este trabalho analisou estratégias de fotoproteção contra a radiação UV dessa macroalga por meio de abordagens fisiológicas e moleculares, considerando a previsão de incremento de r
Publicado em: 2010
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32. Case-control study of skin cancer at the Dermatology Department at the University Hospital of Taubaté in the period between January 2005 - December 2006. / Estudo tipo caso controle de câncer da pele no Serviço de Dermatologia do Hospital Universitário de Taubaté no período de janeiro 2005 - dezembro 2006.
Objective: To identify factors associated to skin cancer in the city of Taubaté-SP using a hospital-based case-control study and logistic regression, with hierarchical pattern. Methods: It was a hospital-based case-control study where the cases were individuals who had skin cancer, residents in the city of Taubaté, assisted at the Dermatology Department at
Publicado em: 2009
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33. The influence of the amount of sunscreen applied and its sun protection factor (SPF): evaluation of two different sunscreens including the same ingredients at different concentrations / Influência da quantidade aplicada de protetores solares no fator de proteção solar (FPS): avaliação de dois protetores solares com os mesmos ingredientes em diferentes concentrações
Introdução: Para determinação do Fator de Proteção Solar (FPS) de protetores solares, de acordo com o FDA e os protocolos internacionais, a quantidade aplicada de produto nos voluntários é de 2 mg/cm2. Diferentes estudos mostraram, entretanto, que os usuários aplicam quantidades muito inferiores a esta quando expostos ao sol. A relação entre a qua
Publicado em: 2009
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34. Photochemoprotective effect of quercetin incorporated in microemulsion against skin damages induced by ultraviolet irradiation / Efeito fotoquimioprotetor de quercetina incorporada em microemulsão contra os danos na pele causados pela radiação ultravioleta
The ultraviolet radiation (UVR) exposition may lead to the skin oxidant/antioxidant imbalance injuring its integrity and leading to several disorders, such as ageing and skin cancer. Considering the close relationship between the increase in oxidative stress and UV-induced skin damages, together with the fact that epidemiological studies indicate that the us
Publicado em: 2009
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35. Crescimento, fotossíntese e mecanismos de fotoproteção em mudas de café (Coffea arabica L.) formadas a pleno sol e à sombra / Growth, photosynthesis and mechanisms of photoprotection in coffee (Coffea arabica L.) seedlings grown under full sunlight and shade
Coffee seedlings have been traditionally grown in shaded nurseries. However, some coffee growers, with the aim of improving acclimation after moving the seedlings from the nursery to the field, are growing the seedlings under full sun. Nonetheless, most information associated with cultivation of coffee seedlings under varying light is restricted to simple mo
Publicado em: 2008
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36. Anatomical and physiological responses of coffee plants grown under different levels of nitrogen and irradiance / Respostas anatômicas e fisiológicas de plantas de café cultivadas em diferentes níveis de nitrogênio e irradiância
Dois experimentos foram conduzidos separadamente e analisados como tal, a fim de investigarem-se os efeitos da irradiância e da nutrição diferencial de nitrogênio sobre (i) as respostas alométricas e morfológicas e (ii) os mecanismos de fotoproteção em plantas de café, sob condições de inverno. Procurou-se, ainda, avaliar os atuais modelos alomét
Publicado em: 2008