Results 51 to 60 of about 30,149 (180)

A Melanin-Related Phenolic Polymer with Potent Photoprotective and Antioxidant Activities for Dermo-Cosmetic Applications

Antioxidants, 2020
Eumelanins, the dark variant of skin pigments, are endowed with a remarkable antioxidant activity and well-recognized photoprotective properties that have been ascribed to pigment components derived from the biosynthetic precursor 5,6-dihydroxyindole-2 ...
Davide Liberti, Maria Laura Alfieri, Daria Maria Monti, Lucia Panzella, Alessandra Napolitano   +4 more
doaj   +1 more source

How does moderate drought affect quantum yield and the regulation of sugar metabolism at low temperature in durum wheat (Triticum durum L.)?

Photosynthetica, 2021
Currently, limited knowledge is available about the combined effects of drought and light in case of cold stress. The investigation of quantum yield kinetics may help understand how plants utilize light under adverse environmental conditions.
R. KHALIL, J. TAJTI, K.Á. HAMOW, K.O. GONDOR, E. DARKO, N. ELSAYED, Z. NAGY, G. SZALAI, T. JANDA, I. MAJLÁTH   +9 more
doaj   +1 more source

Influence of temperature, UV-light wavelength and intensity on polypropylene photothermal oxidation [PDF]

, 2014
A criterion based on the energy absorbed by photosensitive species was proposed to describe the contribution of UV-light to the initiation of the polypropylene photothermal oxidation whatever the light source. The calculation of this energy was performed
COLIN, Xavier, DESNOUX, Eric, FRANCOIS-HEUDE, Alexandre, RICHAUD, Emmanuel   +3 more
core   +4 more sources

Photoprotection in intact cells of photosynthetic bacteria: quenching of bacteriochlorophyll fluorescence by carotenoid triplets. [PDF]

, 2017
Upon high light excitation in photosynthetic bacteria, various triplet states of pigments can accumulate leading to harmful effects. Here, the generation and lifetime of flash-induced carotenoid triplets (3Car) have been studied by observation of the ...
Maroti, P., Sipka, Gábor
core   +7 more sources

Novel Means for Photoprotection

Frontiers in Medicine, 2018
Due to changes in human lifestyle (expanded sunbathing, the use of solaria, etc.) and, most importantly, increasing lifetime and thus higher cumulative exposure to solar radiation, skin aging and skin cancer have become major health issues.
Kevin Sondenheimer, Jean Krutmann, Jean Krutmann   +2 more
doaj   +1 more source

The moss Bryum argenteum var. muticum Brid. is well adapted to cope with high light in continental Antarctica [PDF]

, 2012
The net photosynthetic rate (NP), chlorophyll fluorescence, carotenoid content and chlorophyll content of the cosmopolitan moss Bryum argenteum were measured in the field at Botany Bay, southern Victoria Land, continental Antarctica (77°S).
Green, T.G. Allan, Kulle, Daniel, Pannewitz, Stefan, Sancho, Leopoldo G., Schlensog, Mark, Schroeter, Burkhard   +5 more
core   +3 more sources

The Ratio of A400/A1800 Mapping Identifies Chromosomal Regions Containing Known Photoprotection Recovery-Related Genes in Rice

Rice
The rice, like other plants, undergoes photoprotection mode by increasing nonphotochemical quenching (NPQ) in high light intensity (> 1200 µmol m− 2s− 1 PPFD), which attenuates photosystem II yield (φPSII) drastically.
Shoumik Saha, Nilanjan Sinha Mahapatra, Kriti Bhattacharya, Rimpa Kundu, K. Nimitha, Shamba Ganguly, Sebantee Ganguly, Tirthankar Biswas, Prabir K Bhattacharyya, Somnath Bhattacharyya   +9 more
doaj   +1 more source

NLC-Based Sunscreen Formulations with Optimized Proportion of Encapsulated and Free Filters Exhibit Enhanced UVA and UVB Photoprotection

Pharmaceutics
The topical use of sunscreens is recommended for avoiding the damaging effects of UV radiation. However, improvements are still needed in the existing products to enhance their photoprotection effectiveness and safety. This involves minimizing the use of
Margarete M. de Araújo, Andressa C. Schneid, Mariana S. Oliveira, Samuel V. Mussi, Miller N. de Freitas, Flávia C. Carvalho, Edson A. Bernes Junior, Renato Faro, Hatylas Azevedo   +8 more
doaj   +1 more source

Quantitative photoluminescence of broad band absorbing melanins: A procedure to correct for inner filter and re-absorption effects

, 2004
We report methods for correcting the photoluminescence emission and excitation spectra of highly absorbing samples for re-absorption and inner filter effects.
Forest, Gallas, Hecht, Hill, Jennifer Riesz, Joel Gilmore, Kollias, Lakowicz, McGuiness, Menon, Meredith, Mosca, Nofsinger, Paul Meredith, Prota, Stark, Taylor, Teuchner, Vitkin, Williams   +19 more
core   +1 more source

Ascorbate-mediated regulation of growth, photoprotection, and photoinhibition in Arabidopsis thaliana. [PDF]

, 2018
The requirements for ascorbate for growth and photosynthesis were assessed under low (LL; 250 µmol m-2 s-1) or high (HL; 1600 µmol m-2 s-1) irradiance in wild-type Arabidopsis thaliana and two ascorbate synthesis mutants (vtc2-1 and vtc2-4) that have 30%
Alexander V Ruban, Alexandra J Townsend, Aller, Aro, Asada, Awad, Baier, Barbara Karpinska, Bartoli, Bartoli, Bashandy, Bratt, Brwa Rasool, Christine H Foyer, Cohu, Conklin, de Simone, de Simone, Demmig-Adams, Dowdle, Dutilleul, Foyer, Foyer, Foyer, Foyer, Foyer, Gallie, Giacomelli, Greenberg, Guo, Heber, Heyneke, Horling, Jahns, Jahns, Kangasjärvi, Karpinska, Karpinska, Kerchev, Kiddle, Kromdijk, Lichtenthaler, Lim, Mano, Maruta, Meyer, Miyaji, Munné-Bosch, Müller-Moulé, Müller-Moulé, Neff, Noctor, Nurhayati Razak, Osmond, Page, Pastori, Pavet, Pignocchi, Powles, Queval, Rouhier, Ruban, Ruban, Sarah Alomrani, Shaikhali, Smirnoff, Smirnoff, Tamaoki, Taylor, Tedone, Tyystjärvi, Tyystjärvi, Tóth, Vanderauwera, Wang, Ware, Wheeler, William Plumb, Yabuta, Yin, Zechmann, Zhang, Zhang   +82 more
core   +2 more sources