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Ultraviolet radiation

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https://www.readbyqxmd.com/read/28229992/increased-5-hydroxymethylcytosine-and-ten-eleven-translocation-protein-expression-in-ultraviolet-b-irradiated-hacat-cells
#1
Dan Wang, Jin-Hua Huang, Qing-Hai Zeng, Can Gu, Shu Ding, Jian-Yun Lu, Jing Chen, Sheng-Bo Yang
BACKGROUND: DNA hydroxymethylation refers to a chemical modification process in which 5-methylcytosine (5mC) is catalyzed to 5- hydroxymethylcytosine (5hmC) by ten-eleven translocation (TET) family proteins. Recent studies have revealed that aberrant TETs expression or 5hmC level may play important roles in the occurrence and development of various pathological and physiological processes including cancer and aging. This study aimed to explore the relation between aberrant DNA hydroxymethylation with skin photoaging and to investigate the levels of TETs, 5mC, and 5hmC expression 24 h after 40 mJ/cm2 and 80 mJ/cm2 doses of ultraviolet B (UVB) irradiation to HaCaT cells...
2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28223751/secondary-cutaneous-amyloidosis-in-a-patient-with-mycosis-fungoides
#2
Chan Hee Nam, Min Kee Park, Mi Soo Choi, Seung Phil Hong, Byung Cheol Park, Myung Hwa Kim
Secondary cutaneous amyloidosis refers to clinically unapparent amyloid deposits within the skin in association with a pre-existing skin condition or skin tumors, such as basal cell carcinoma, porokeratosis, solar elastosis, Bowen's disease, and mycosis fungoides. A 70-year-old woman presented with a 6-month history of asymptomatic multiple yellowish plaques on both legs. She had been diagnosed with mycosis fungoides 7 years ago and was treated with psoralen and ultraviolet A radiation (PUVA) therapy, narrow-band ultraviolet B (UVB) therapy, and acitretin for 5 years...
February 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28222363/very-short-term-reactive-forecasting-of-the-solar-ultraviolet-index-using-an-extreme-learning-machine-integrated-with-the-solar-zenith-angle
#3
Ravinesh C Deo, Nathan Downs, Alfio V Parisi, Jan F Adamowski, John M Quilty
Exposure to erythemally-effective solar ultraviolet radiation (UVR) that contributes to malignant keratinocyte cancers and associated health-risk is best mitigated through innovative decision-support systems, with global solar UV index (UVI) forecast necessary to inform real-time sun-protection behaviour recommendations. It follows that the UVI forecasting models are useful tools for such decision-making. In this study, a model for computationally-efficient data-driven forecasting of diffuse and global very short-term reactive (VSTR) (10-min lead-time) UVI, enhanced by drawing on the solar zenith angle (θs) data, was developed using an extreme learning machine (ELM) algorithm...
February 18, 2017: Environmental Research
https://www.readbyqxmd.com/read/28220610/comparison-and-analysis-on-the-serum-binding-characteristics-of-aspirin-zinc-complex-and-aspirin
#4
Hua-Xin Zhang, Qun Zhang, Hong-Lin Wang, Li-Wei Li
This study was designed to compare the protein-binding characteristics of aspirin-zinc complex (AZN) with those of aspirin itself. AZN was synthesized and interacted with a model transport protein, human serum albumin (HSA). Three-dimensional fluorescence, ultraviolet-visible and circular dichroism (CD) spectra were used to characterize the interaction of AZN with HSA under physiological conditions. The interaction mechanism was explored using a fluorescence quenching method and thermodynamic calculation. The binding site and binding locality of AZN on HSA were demonstrated using a fluorescence probe technique and Förster non-radiation energy transfer theory...
February 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28220485/epidemiology-of-basal-cell-carcinoma-scholarly-review
#5
REVIEW
J A C Verkouteren, K H R Ramdas, M Wakkee, T Nijsten
Basal cell carcinoma (BCC) is the most common cancer in white-skinned individuals with increasing incidence rates worldwide. Patients with BCC place a large burden on healthcare systems, because of the high incidence and the increased risk of synchronous and metachronous BCCs and other ultraviolet radiation (UVR) related skin cancers (i.e. field cancerization). As a result, the disability-adjusted life years and healthcare costs have risen significantly in recent decades. BCC is a complex disease, in which the interplay between UVR, phenotype (UVR-sensitive) and genotype (somatic mutations and germline mutations/polymorphisms) fulfils a key role in the aetiopathogenesis...
February 20, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28218687/uv-radiation-from-physics-to-impacts
#6
EDITORIAL
Hanns Moshammer, Stana Simic, Daniela Haluza
Ultraviolet (UV) radiation has affected life at least since the first life forms moved out of the seas and crawled onto the land. Therefore, one might assume that evolution has adapted to natural UV radiation. However, evolution is mostly concerned with the propagation of the genetic code, not with a long, happy, and fulfilling life. Because rickets is bad for a woman giving birth, the beneficial effects of UV-radiation outweigh the adverse effects like aged skin and skin tumors of various grades of malignancy that usually only afflict us at older age...
February 17, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28217715/sensitivity-of-photoelectron-diffraction-to-conformational-changes-of-adsorbed-molecules-tetra-tert-butyl-azobenzene-au-111
#7
A Schuler, M Greif, A P Seitsonen, G Mette, L Castiglioni, J Osterwalder, M Hengsberger
Electron diffraction is a standard tool to investigate the atomic structure of surfaces, interfaces, and adsorbate systems. In particular, photoelectron diffraction is a promising candidate for real-time studies of structural dynamics combining the ultimate time resolution of optical pulses and the high scattering cross-sections for electrons. In view of future time-resolved experiments from molecular layers, we studied the sensitivity of photoelectron diffraction to conformational changes of only a small fraction of molecules in a monolayer adsorbed on a metallic substrate...
January 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28213325/carbon-dots-based-fret-for-the-detection-of-dna-damage
#8
Jiri Kudr, Lukas Richtera, Kledi Xhaxhiu, David Hynek, Zbynek Heger, Ondrej Zitka, Vojtech Adam
Here, we aimed our attention at the synthesis of carbon dots (C-dots) with the ability to interact with DNA to suggest an approach for the detection of DNA damage. Primarily, C-dots modified with amine moieties were synthesized using the one-step microwave pyrolysis of citric acid in the presence of diethylenetriamine. The C-dots showed strong photoluminescence with a quantum yield of 4%. In addition, the C-dots (2.8±0.8nm) possessed a good colloidal stability and exhibited a positive surface charge (ζ=36mV) at a neutral pH...
February 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28213304/photocatalytic-effects-of-titanium-dioxide-nanoparticles-on-aquatic-organisms-current-knowledge-and-suggestions-for-future-research
#9
REVIEW
Vena N Haynes, J Evan Ward, Brandon J Russell, Alexander G Agrios
Nanoparticles are entering natural systems through product usage, industrial waste and post-consumer material degradation. As the production of nanoparticles is expected to increase in the next decade, so too are predicted environmental loads. Engineered metal-oxide nanomaterials, such as titanium dioxide, are known for their photocatalytic capabilities. When these nanoparticles are exposed to ultraviolet radiation in the environment, however, they can produce radicals that are harmful to aquatic organisms...
February 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28213175/quantitative-analysis-of-mycosporine-like-amino-acids-in-marine-algae-by-capillary-electrophoresis-with-diode-array-detection
#10
Anja Hartmann, Adele Murauer, Markus Ganzera
Marine species have evolved a variety of physical or chemical strategies to diminish damage from elevated environmental ultraviolet radiation. Mycosporine-like amino acids, a group of widely distributed small water soluble compounds, are biologically relevant because of their photo-protective potential. In addition, presumed antioxidant and skin protective strategies raise the interest for possible medicinal and cosmetic applications. In this study the first CE method for the quantification of mycosporine-like amino acids in marine species is presented...
February 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28212931/uv-protective-poly-lactic-acid-rosin-films-for-sustainable-packaging
#11
Meenu Narayanan, Sravanthi Loganathan, Ravi Babu Valapa, Sabu Thomas, T O Varghese
Recently, biopolymer based plastic materials are regarded as potential alternative for conventional plastics of fossil fuel origin in order to compensate depleting petroleum resources and address environmental pollution issues. Poly(lactic acid) (PLA) is one among the biopolymers which is rapidly commercialized for food packaging application. However, the demerits accompanied with PLA like brittle nature, slower crystallization rate, poor gas barrier and high ultraviolet radiation transmission properties confines its commercial application in food packaging sector...
February 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28211039/cutaneous-squamous-cell-carcinoma-an-epidemiological-review
#12
REVIEW
A C Green, C M Olsen
Cutaneous squamous cell carcinoma (SCC) is a common cancer in white populations and its disease burden is often substantially underestimated. SCC occurs more often in men than women and increases dramatically with age; those affected often develop multiple primaries over time, which increases the burden. The main external cause is solar ultraviolet radiation (UVR), with immunosuppression being the other established risk factor, shown by the high SCC rates in organ transplant recipients. Sunbed use and certain genetic disorders and medical conditions are also associated with SCC, while associations with human papillomavirus infection and high bodyweight are not established...
February 16, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28209050/-active-photoprotection-sunscreens-with-dna-repair-enzymes-a-review-of-the-literature
#13
Matteo Megna, Serena Lembo, Nicola Balato, Giuseppe Monfrecola
Ultraviolet (UV) radiation exerts different harmful effects on human health, being the main etiological agents of certain skin cancers and photoaging. In this context, photoprotection, intended as a set of measures adopted to limit and prevent the effects of UV radiation, plays a critical role in avoiding undesired sunlight outcomes. Traditional sunscreens represent a widely used photoprotective approach, even if they exert a "passive photoprotection" and are not effective once damage to skin cells has been generated after sun exposure...
February 16, 2017: Giornale Italiano di Dermatologia e Venereologia: Organo Ufficiale, Società Italiana di Dermatologia e Sifilografia
https://www.readbyqxmd.com/read/28208834/in%C3%A2-pursuit%C3%A2-of%C3%A2-vitamin%C3%A2-d%C3%A2-in%C3%A2-plants
#14
Lucinda J Black, Robyn M Lucas, Jill L Sherriff, Lars Olof Björn, Janet F Bornman
Vitamin D deficiency is a global concern. Much research has concentrated on the endogenous synthesis of vitamin D in human skin following exposure to ultraviolet-B radiation (UV-B, 280-315 nm). In many regions of the world there is insufficient UV-B radiation during winter months for adequate vitamin D production, and even when there is sufficient UV-B radiation, lifestyles and concerns about the risks of sun exposure may lead to insufficient exposure and to vitamin D deficiency. In these situations, dietary intake of vitamin D from foods or supplements is important for maintaining optimal vitamin D status...
February 13, 2017: Nutrients
https://www.readbyqxmd.com/read/28208641/temporal-trends-in-satellite-derived-erythemal-uvb-and-implications-for-ambient-sun-exposure-assessment
#15
Marvin Langston, Leslie Dennis, Charles Lynch, Denise Roe, Heidi Brown
Ultraviolet radiation (UVR) has been associated with various health outcomes, including skin cancers, vitamin D insufficiency, and multiple sclerosis. Measurement of UVR has been difficult, traditionally relying on subject recall. We investigated trends in satellite-derived UVB from 1978 to 2014 within the continental United States (US) to inform UVR exposure assessment and determine the potential magnitude of misclassification bias created by ignoring these trends. Monthly UVB data remotely sensed from various NASA satellites were used to investigate changes over time in the United States using linear regression with a harmonic function...
February 10, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28203099/a-new-dermocosmetic-containing-retinaldehyde-delta-tocopherol-glucoside-and-glycylglycine-oleamide-for-managing-naturally-aged-skin-results-from-in-vitro-to-clinical-studies
#16
Céline Rouvrais, Daniel Bacqueville, Patrick Bogdanowicz, Marie-José Haure, Laure Duprat, Christine Coutanceau, Nathalie Castex-Rizzi, Hélène Duplan, Valérie Mengeaud, Sandrine Bessou-Touya
INTRODUCTION: Natural aging of skin tissues, the addition of the cumulative action of the time and radiation exposure result in skin atrophy, wrinkles and degeneration of the extracellular matrix (ECM). The aim of the study was to investigate the beneficial effect of a combination containing retinaldehyde (RAL), delta-tocopherol glucoside (delta-TC) and glycylglycine ole-amide (GGO) and of a dermocosmetic containing the combination. MATERIALS AND METHODS: The protective effect of the combination was assessed through in vitro gene expression of ultraviolet (UV)-irradiated fibroblasts...
2017: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/28202648/living-in-flowing-water-increases-resistance-to-ultraviolet-b-radiation
#17
Ensiyeh Ghanizadeh-Kazerouni, Craig E Franklin, Frank Seebacher
Ultraviolet B radiation (UV-B) is an important environmental driver that can affect locomotor performance negatively by inducing production of reactive oxygen species (ROS). Prolonged regular exercise increases antioxidant activities, which may alleviate the negative effects of UV-B-induced ROS. Animals naturally performing exercise, such as humans performing regular exercise or fish living in flowing water, may therefore be more resilient to the negative effects of UV-B. We tested this hypothesis in a fully factorial experiment, where we exposed mosquitofish (Gambusia holbrooki) to UV-B and control (no UV-B) conditions in flowing and still water...
February 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28198887/femtosecond-two-photon-planar-laser-induced-fluorescence-of-carbon-monoxide-in-flames
#18
Daniel R Richardson, Sukesh Roy, James R Gord
Two-photon, planar laser-induced fluorescence (TP-PLIF) of carbon monoxide was performed in steady and driven flames using femtosecond (fs) laser pulses at 1 kHz. Excitation radiation at 230.1 nm (full-width at half-maximum bandwidth of 270  cm<sup>-1</sup>) was used to pump many rovibrational two-photon transitions in the B<sup>1</sup>∑<sup>+</sup>←X<sup>1</sup>∑<sup>+</sup> system. Visible fluorescence in the range 362-516 nm was captured using an image intensifier and high-speed camera...
February 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28198628/protection-of-photosynthetic-algae-against-ultraviolet-radiation-by-one-step-ceo2-shellization
#19
Pengqiang Duan, Tingting Huang, Wei Xiong, Lei Shu, Yuling Yang, Changyu Shao, Xurong Xu, Weimin Ma, Ruikang Tang
Photosynthetic microalgae play an important role in solar-to-chemical energy conversion on Earth but the increasing solar ultraviolet (UV) radiation seriously reduces the biological photosynthesis. Here we developed a one-step approach to construct cell-in-shell hybrid structure by using direct adsorption of CeO2 nanoparticles onto cells. The engineered CeO2 nanoshell can efficiently protect the enclosed Chlorella cell due to its excellent UV filter property, which can also eliminate UV-induced oxidative stress...
February 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28195834/surface-acoustic-waves-induced-micropatterning-of-cells-in-gelatin-methacryloyl-gelma-hydrogels
#20
Shahid M Naseer, Amir Manbachi, Mohamadmahdi Samandari, Philipp Walch, Yuan Gao, Yu Shrike Zhang, Farideh Davoudi, Wesley Wang, Karen Abrinia, Jonathan M Cooper, Ali Khademhosseini, Su Ryon Shin
Acoustic force patterning is an emerging technology that provides a platform to control the spatial location of cells in a rapid, accurate, yet contactless manner. However, very few studies have been reported on the usage of acoustic force patterning for the rapid arrangement of biological objects, such as cells, in a three-dimensional (3D) environment. In this study, we report on a bio-acoustic force patterning technique, which uses surface acoustic waves (SAWs) for the rapid arrangement of cells within an extracellular matrix-based hydrogel such as gelatin methacryloyl (GelMA)...
February 14, 2017: Biofabrication
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