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39 results for “photoprotection”
Consequences of Parenteral Nutrition Photoprotection on Oxidant Related Diseases Among Extremely Low Birth Weight Infants
ClinicalTrials.gov study NCT00328419. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Insights into the photoprotection mechanism of the UV filter homosalate
<p>Homosalate (HMS) is a salicylate molecule that is commonly included within commercial sunscreen formulations to provide protection from the adverse effects of ultraviolet (UV) radiation exposure. In the present work, the mechanisms by which HMS provides UV photoprotection are unravelled, using a multi-pronged approach involving a combination of time-resolved ultrafast laser spectroscopy in the gas-phase and in solution, laser-induced fluorescence, steady-state absorption spectroscopy, and computational methods. The unique combination of these techniques allow us to show that the <em>enol</em> tautomer of HMS undergoes ultrafast excited state intramolecular proton transfer (ESIPT) upon photoexcitation in the UVB (290–320 nm) region; once in the <em>keto</em> tautomer, the excess energy is predominantly dissipated non-radiatively. Sharp transitions are observed in the LIF spectrum at close-to-origin excitation energies, which points towards the potential presence of a second conformer that does not undergo ESIPT. These studies demonstrate that, overall, HMS exhibits mostly favourable photophysical characteristics of a UV filter for inclusion in sunscreen formulations.</p>
A comparative analysis of the photoprotection hypothesis for the evolution of autumn colors
<p><span><span><span><span><span><span><span><span><span><span><span>The adaptive <span><span>value </span></span>of autumn colors – the seasonal production of red anthocyanins observed in <span><span>many </span></span>species of trees <span><span>and shrubs </span></span>– is still debated. According to the photoprotection hypothesis, anthocyanins protect leaves from photoinhibition and photooxidation at low temperatures, enabling the tree to reabsorb nutrients more efficiently before leaf fall. Hence, the hypothesis predicts that autumn colors are more likely to evolve in species growing in colder environments. We tested this prediction by comparing the climatic parameters of 237 North American tree species. We found that, while species with yellow autumn leaves grow under lower minimum temperatures than species with green leaves, there is no significant difference in <span><span>temperature</span></span>between species with red autumn leaves and species with green or yellow autumn leaves. We conclude that, while reabsorbing chlorophyll in autumn, and the consequent unmasking of yellow carotenoids, may be an adaptation to cold temperatures, the production of red anthocyanins is not. Hence, our inter-specific comparative analysis does not support the photoprotection hypothesis <span><span>as an explanation </span></span>for the evolution of autumn colors.</span></span></span></span></span></span></span></span></span></span></span></p>
Wavepacket insights into the photoprotection mechanism of the UV filter methyl anthranilate
<p>Geometries of the S<sub>0,eq </sub>(S0_geom.csv), S<sub>1,eq</sub> (S1_geom.csv), and D<sup>+</sup><sub>0,eq</sub> (D0+_geom.csv) states of MA contain atom labels (<em>e.g.</em> C) and Cartesian coordinates in four columns; distances are in Angstroms (Å).</p> <p>All TR-PES transients are formatted as comma separated variable text files: each column is the photoelectron intensity at one time delay (labeled in the first row) with one eKE value per row (labeled in the first column). Files are labeled with the molecule, pump wavelength, probe wavelength, and a date (<em>e.g</em>. MA_344_285_18June2018.csv).</p> <p>The MATLAB code used to calculate the wavepacket “transients” is also contained herein as wavepacket.m. The code takes user inputs such as the Franck-Condon factors and laser pulse spectral characteristics.</p> <p>The LIF spectrum of photoexcited MA (MA_LIF.csv) is also presented as two columns: pump photon energy and LIF intensity.</p>
A comparative analysis of the photoprotection hypothesis for the evolution of autumn colors
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UV Photoprotection and Long-lasting Pigmentation from UVA and/or UVB
GEO Series GSE56754. Homo sapiens. 132 samples. Type: Expression profiling by array.
Role of HLR1, an ancient light-harvesting protein of PSI, in light absorption and photoprotection in Nannochloropsis oceanica
GEO Series GSE156681. Nannochloropsis oceanica. 10 samples. Type: Expression profiling by high throughput sequencing.
Photoprotection Habits in Patients With Vitiligo
ClinicalTrials.gov study NCT03323125. IPD Sharing: NO. Countries: 1. Publications: 0.
Photoprotection Efficiency with Sunscreen Formulas Under Visible Light Exposure.
ClinicalTrials.gov study NCT06827392. IPD Sharing: NO. Countries: 1. Publications: 0.
Evaluation of the Photoprotection Efficacy with Sunscreen Formulas Under Visible Light Exposure
ClinicalTrials.gov study NCT06803901. IPD Sharing: NO. Countries: 1. Publications: 0.
Study of the Photoprotection and Prevention of Actinic Damage With Anthelios Fluide 100 KA+ UVMune 400 in Patients With Multiple Actinic Keratoses
ClinicalTrials.gov study NCT07335003. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Photoprotective Effects of a SPF50+ Sunscreen on Skin Genotoxicity Induced by Repeated Chronic Outdoor Sun Exposure
ClinicalTrials.gov study NCT05926791. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Photoprotection Efficacy of Different Topical Agents Under Visible Light Exposure
ClinicalTrials.gov study NCT06796153. IPD Sharing: NO. Countries: 1. Publications: 0.
Photoprotection Efficacy of a Sunscreen Under Visible Light Exposure by Using Two Different Simulators
ClinicalTrials.gov study NCT06796140. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Photoprotection Efficacy With Sunscreen Formulas Containing the Cyclic Merocyanine Long-UVA Absorber MCE, Under Real Sun Exposure
ClinicalTrials.gov study NCT04865055. IPD Sharing: YES. Countries: 1. Publications: 0.
Expert Consensus on Photoprotection Practices: A Delphi Study
ClinicalTrials.gov study NCT07296588. IPD Sharing: NO. Countries: 1. Publications: 0.
Photoprotection Efficacy With Sunscreen Formulas Containing the Cyclic Merocyanine Long-UVA Absorber MCE Under UV Day Light Exposure
ClinicalTrials.gov study NCT04866797. IPD Sharing: YES. Countries: 1. Publications: 0.
Evaluate the Photoprotection Efficacy of Sunscreen Formulas Under Visible Light Exposure
ClinicalTrials.gov study NCT06796192. IPD Sharing: NO. Countries: 1. Publications: 0.
Photoprotection Efficacy With Sunscreen Formulas Containing the Cyclic Merocyanine Long-UVA Absorber MCE Under Long-UVA Exposure.
ClinicalTrials.gov study NCT04865120. IPD Sharing: YES. Countries: 1. Publications: 0.
ScienceDex guides
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These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.