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Cap photoprotection

Erola Fenollosa, Sergi Munné-Bosch, Marta Pintó-Marijuan
Photoprotective strategies vary greatly within the plant kingdom and reflect a plant's physiological status and capacity to cope with environment variations. The plasticity and intensity of these responses may determine plant success. Invasive species are reported to show increased vigor to displace native species. Describing the mechanisms that confer such vigor is essential to understanding the success of invasive species. We performed an experiment whereby two species were monitored: Carpobrotus edulis, an aggressive invasive species in the Mediterranean basin, and Crithmum maritimum, a coexisting native species in the Cap de Creus Natural Park (NE Spain)...
June 2017: Physiologia Plantarum
Eudes Euler de Souza Lucena, Danielle Clarisse Barbosa Costa, Ericka Janine Dantas da Silveira, Kenio Costa Lima
Subjects were selected from five urban beaches to characterize the type of work conducted on urban beaches in the city of Natal, state of Rio Grande do Norte, Brazil, and determine potential associated factors among workers exposed to the sun. Data collection was based on a validated questionnaire. Results were obtained for 362 workers. Individuals were predominantly male (72.6%) who worked under direct exposure to the sun (87.8%). Almost 95% had no more than 6 years of schooling and 87.91% earned an average monthly income of $318...
April 2014: Ciência & Saúde Coletiva
Eudes Euler de Souza Lucena, Danielle Clarisse Barbosa Costa, Éricka Janine Dantas da Silveira, Kenio Costa Lima
BACKGROUND: Workers from various occupational groups stand out as being more susceptible to photodamage. Behaviors that can reduce the risk of onset of these disorders include the limitation or reduction of sun exposure, use of photoprotective clothing, and correct use of sunscreen. The present study aimed to verify the use of photoprotection measures by beach workers on the lips and perioral regions, as well as investigate possible associations with sociodemographic, occupational, and health variables...
November 2014: International Journal of Dermatology
E E de Souza Lucena, D C B Costa, E J D da Silveira, K C Lima
OBJECTIVES: Assess the prevalence and potential factors associated to actinic cheilitis (AC) in workers exposed to the sun. MATERIALS AND METHODS: Workers assigned to urban beaches in a city in Northeastern Brazil completed a questionnaire containing personal and health data. Lips were examined to identify AC. RESULTS: A total of 362 workers, of which 15.5% exhibited AC, were examined. Among those with AC, there was a prevalence of males (86%), aged 37years or older (61...
September 2012: Oral Diseases
Zalfa A Abdel-Malek, Andrew Ruwe, Renny Kavanagh-Starner, Ana Luisa Kadekaro, Viki Swope, Carrie Haskell-Luevano, Leonid Koikov, James J Knittel
One skin cancer prevention strategy that we are developing is based on synthesizing and testing melanocortin analogs that reduce and repair DNA damage resulting from exposure to solar ultraviolet (UV) radiation, in addition to stimulating pigmentation. Previously, we reported the effects of tetrapeptide analogs of alpha-melanocortin (alpha-MSH) that were more potent and stable than the physiological alpha-MSH, and mimicked its photoprotective effects against UV-induced DNA damage in human melanocytes. Here, we report on a panel of tripeptide analogs consisting of a modified alpha-MSH core His(6)-d-Phe(7)-Arg(8), which contained different N-capping groups, C-terminal modifications, or arginine mimics...
October 2009: Pigment Cell & Melanoma Research
Silvana Halac, Ernesto García-Mendoza, Anastazia T Banaszak
This study demonstrates that UV radiation (UVR) reduces the photoprotective capacity of the diatom Phaeodactylum tricornutum by affecting xanthophyll cycle (XC) activity. The short-term reduction of photosystem II (PSII) maximum efficiency of charge separation (F(v)/F(m)) in cells exposed to UVR could be explained mainly by a reduced photoprotective capacity under this condition. Phaeodactylum tricornutum cells acclimated to two different photosynthetically active radiation (PAR) intensities, high light (HL, 200 micromol quanta m(-2) s(-1)) and low light (LL, 50 micromol quanta m(-2) s(-1)), were exposed to saturating irradiance (1100 micromol quanta m(-2) s(-1)) in the presence (PAR + UVR) and absence of UVR (PAR)...
May 2009: Photochemistry and Photobiology
A Petrella, P D Cozzoli, M L Curri, M Striccoli, P Cosma, A Agostiano
Hetero-structures formed by quantum-sized ZnO nanocrystals and photosynthetic pigments were prepared by adsorbing either chlorophyll a, carotenoids or their mixture onto a film of organic-capped ZnO nanoparticles. Photoelectrochemical measurements were comparatively performed on both bulk and nanocrystalline ZnO films after dye-covering in order to probe the photosensitization process occurring at the hetero-junction. The photoconversion process was found to be greatly enhanced at the nanocrystalline electrodes upon sensitization with a dye mixture...
June 2004: Bioelectrochemistry
E Estève, P Armingaud, J-M Baranger, N Bellier, M Darchy, C Delavierre, M Drouault, L Ducroquet, E Eynard, V Georgescu, C Leblanc, A Maruani, Y Pasquier, S Wirth, L Martin
INTRODUCTION: The protection of children from sun exposure appears inadequate. We assessed the knowledge of pre-teenagers, before and after they attended a training session on sun exposure. This investigation was carried out in Orléans and in 5 surrounding cities, from September 2000 to April 2002. MATERIAL AND METHODS: A didactic slide show on sun exposure and photoprotection was presented to 683 children in grade 4 and 5 by a nurse and a dermatologist during 30 informative sessions...
February 2003: Annales de Dermatologie et de Vénéréologie
N Kobayashi, A Nakagawa, T Muramatsu, Y Yamashina, T Shirai, M W Hashimoto, Y Ishigaki, T Ohnishi, T Mori
Melanin can form supranuclear caps in human epidermis, suggesting that intracellular melanin reduces ultraviolet transmission to underlying cell nuclei and inhibits the formation of ultraviolet induced DNA photoproducts. The purpose of this study was to determine the photoprotective effect of epidermal melanin. We irradiated normal human skin explants with ultraviolet B and determined the formation of cyclobutane pyrimidine dimers and (6-4)photoproducts in individual epidermal cells by indirect immunofluorescence and by laser cytometry using monoclonal antibodies specific for cyclobutane dimers or for (6-4)photoproducts...
May 1998: Journal of Investigative Dermatology
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