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https://www.readbyqxmd.com/read/29341894/protective-effects-of-antioxidin-rl-from-odorrana-livida-against-ultraviolet-b-irradiated-skin-photoaging
#1
Di Qin, Wen-Hui Lee, Zhiqin Gao, Weifen Zhang, Meiyu Peng, Tongyi Sun, Yuanyuan Gao
The unavoidable daily exposure of the skin to ultraviolet (UV) B radiation is proven to have deleterious effects. The action mechanism of antioxidin-RL, an antioxidant peptide purified from skin secretions of frog Odorrana livida with amino acid sequence of AMRLTYNRPCIYAT, is well characterized by NMR titration and mutation based on ABTS+ scavenging activities. In order to explore the protective effects of antioxidin-RL against UVB-irradiated skin photoaging, cell uptake assay was used to detect the location of antioxidin-RL molecules serving various biological functions in the cells...
January 13, 2018: Peptides
https://www.readbyqxmd.com/read/29339330/photocatalytic-degradation-of-aniline-using-an-autonomous-rotating-drum-reactor-with-both-solar-and-uv-c-artificial-radiation
#2
A Durán, J M Monteagudo, I San Martín, S Merino
The aim of this work was to evaluate the performance of a novel self-autonomous reactor technology (capable of working with solar irradiation and artificial UV light) for water treatment using aniline as model compound. This new reactor design overcomes the problems of the external mass transfer effect and the accessibility to photons occurring in traditional reaction systems. The UV-light source is located inside the rotating quartz drums (where TiO2 is immobilized), allowing light to easily reach the water and the TiO2 surface...
January 12, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29339217/effects-of-rutin-on-the-physicochemical-properties-of-skin-fibroblasts-membrane-disruption-following-uv-radiation
#3
Izabela Dobrzyńska, Agnieszka Gęgotek, Ewelina Gajko, Elżbieta Skrzydlewska, Zbigniew A Figaszewski
Human skin provides the body's first line of defense against physical and environmental assaults. This study sought to determine how rutin affects the membrane electrical properties, sialic acid content, and lipid peroxidation levels of fibroblast membranes after disruption by ultraviolet (UV) radiation. Changes in cell function may affect the basal electrical surface properties of cell membranes, and changes can be detected by electrokinetic measurements. The charge density of the fibroblast membrane surface was measured as a function of pH...
January 12, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29339214/preparation-and-spectral-properties-of-europium-hydrogen-squarate-microcrystals
#4
T Kolev, N Danchova, D Shandurkov, S Gutzov
A simple scheme for preparation of europium hydrogen squarate octahydrate microcrystals, Eu(HSq)3·8H2O is demonstrated. The microcrystalline powders obtained have a potential application as non-centrosymmetric and UV radiation - protective hybrid optical material. The site-symmetry of the Eu - ion is C2V or lower, obtained from diffuse reflectance spectra. The formation of europium hydrogen squarate is supported by IR - spectroscopy, UV-vis spectroscopy, chemical analysis and X-ray diffraction. A detailed analysis of the UV-vis and IR spectra of the micropowders prepared is presented...
January 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29336831/ultraviolet-radiation-significantly-enhances-the-molecular-response-to-dispersant-and-sweet-crude-oil-exposure-in-nematostella-vectensis
#5
Ann M Tarrant, Samantha L Payton, Adam M Reitzel, Danielle T Porter, Matthew J Jenny
Estuarine organisms are subjected to combinations of anthropogenic and natural stressors, which together can reduce an organisms' ability to respond to either stress or can potentiate or synergize the cellular impacts for individual stressors. Nematostella vectensis (starlet sea anemone) is a useful model for investigating novel and evolutionarily conserved cellular and molecular responses to environmental stress. Using RNA-seq, we assessed global changes in gene expression in Nematostella in response to dispersant and/or sweet crude oil exposure alone or combined with ultraviolet radiation (UV)...
January 4, 2018: Marine Environmental Research
https://www.readbyqxmd.com/read/29331917/comparision-of-photocatalysis-and-photolysis-processes-for-arsenic-oxidation-in-water
#6
Klaiani B Fontana, Giane G Lenzi, Eriton C R Seára, Eduardo S Chaves
The oxidation of As(III) to As(V) in aqueous solution was evaluated using heterogeneous photocatalysis and photolysis. The influence of TiO2 as catalyst in different crystalline (rutile, anatase) and commercial forms was evaluated in a batch reactor and an insignificant difference was observed between them. The process by photocatalysis reached up to 97% As(III) oxidation and no significant difference was observed comparing to results obtained by photolysis. The photolysis experiments (UV radiation only), also carried out in a batch system, showed a high oxidation rate of As(III) (90% in 20min)...
January 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29328718/charge-catastrophe-and-dielectric-breakdown-during-exposure-of-organic-thin-films-to-low-energy-electron-radiation
#7
A Thete, D Geelen, S J van der Molen, R M Tromp
The effects of exposure to ionizing radiation are central in many areas of science and technology, including medicine and biology. Absorption of UV and soft-x-ray photons releases photoelectrons, followed by a cascade of lower energy secondary electrons with energies down to 0 eV. While these low energy electrons give rise to most chemical and physical changes, their interactions with soft materials are not well studied or understood. Here, we use a low energy electron microscope to expose thin organic resist films to electrons in the range 0-50 eV, and to analyze the energy distribution of electrons returned to the vacuum...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29324843/beta-hpv38-oncoproteins-act-with-a-hit-and-run-mechanism-in-ultraviolet-radiation-induced-skin-carcinogenesis-in-mice
#8
Daniele Viarisio, Karin Müller-Decker, Rosita Accardi, Alexis Robitaille, Matthias Dürst, Katrin Beer, Lars Jansen, Christa Flechtenmacher, Matthias Bozza, Richard Harbottle, Catherine Voegele, Maude Ardin, Jiri Zavadil, Sandra Caldeira, Lutz Gissmann, Massimo Tommasino
Cutaneous beta human papillomavirus (HPV) types are suspected to be involved, together with ultraviolet (UV) radiation, in the development of non-melanoma skin cancer (NMSC). Studies in in vitro and in vivo experimental models have highlighted the transforming properties of beta HPV E6 and E7 oncoproteins. However, epidemiological findings indicate that beta HPV types may be required only at an initial stage of carcinogenesis, and may become dispensable after full establishment of NMSC. Here, we further investigate the potential role of beta HPVs in NMSC using a Cre-loxP-based transgenic (Tg) mouse model that expresses beta HPV38 E6 and E7 oncogenes in the basal layer of the skin epidermis and is highly susceptible to UV-induced carcinogenesis...
January 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29324427/lemons-in-the-arizona-sunshine-the-effects-of-furocoumarins-leading-to-phytophotodermatitis-and-burn-like-injuries
#9
Marc R Matthews, Joel C VanderVelde, Daniel M Caruso, Kevin N Foster
INTRODUCTION: Phytophototoxic dermatitis is a strong phototoxic reaction to ultraviolet A (UV-A) radiation exposure after cutaneous contact with citrus fruit containing furocoumarins, leading to skin injury. At the Arizona Burn Center (Phoenix, AZ), the majority of these injuries are managed in the outpatient setting. CASE REPORT: The authors present a pediatric admission for burn-like injuries following prolonged cutaneous exposure to lemons while playing in the Arizona sunshine...
December 2017: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/29322505/impact-of-bistrand-abasic-sites-and-proximate-orientation-on-dna-global-structure-and-duplex-energetics
#10
Conceição A Minetti, Jeffrey Y Sun, Daniel P Jacobs, Inkoo Kang, David P Remeta, Kenneth J Breslauer
Bistrand lesions embedded within a single helical turn of tridecameric deoxyoligonucleotide duplexes represent a model system for exploring the impact of clustered lesions that occur in vivo and pose a significant challenge to cellular repair machineries. Such investigations are essential for understanding the forces that dictate lesion-induced mutagenesis, carcinogenesis, and cytotoxicity within a context that mimics local helical perturbations caused by an ionizing radiation event. This study characterizes the structural and energy profiles of DNA duplexes harboring synthetic abasic sites (tetrahydrofuran, F) as models of clustered bistrand abasic (AP) lesions...
January 11, 2018: Biopolymers
https://www.readbyqxmd.com/read/29322085/data-on-the-effect-of-the-dispersion-of-functionalized-nanoparticles-tio2-with-photocatalytic-activity-in-ldpe
#11
Alvarado Jahell, Acosta Guillermo, Perez Fatima
This article contains the dataset referring to the article "Study of the effect of the dispersion of functionalized nanoparticles TiO2 with photocatalytic activity in LDPE" (Jahell et al., 2016) [1]. It includes the FT-IR data of the functionalized nanoparticles of TiO2 with Hexadecyltrimethoxysilane in different degrees of functionalization, thermogravimetric analysis, distribution and particle size in the polymer matrix by scanning electron microscopy (SEM), carbonyl index, gravimetry and scanning electron microscopy of the nanocomposite degraded by UV radiation...
February 2018: Data in Brief
https://www.readbyqxmd.com/read/29317335/integrated-case-control-and-somatic-germline-interaction-analyses-of-melanoma-susceptibility-genes
#12
Yao Yu, Hao Hu, Jiun-Sheng Chen, Fulan Hu, Jerry Fowler, Paul Scheet, Hua Zhao, Chad D Huff
While a number of genes have been implicated in melanoma susceptibility, the role of protein-coding variation in melanoma development and progression remains underexplored. To better characterize the role of germline coding variation in melanoma, we conducted a whole-exome case-control and somatic-germline interaction study involving 322 skin cutaneous melanoma cases from The Cancer Genome Atlas and 3607 controls of European ancestry. We controlled for cross-platform technological stratification using XPAT and conducted gene-based association tests using VAAST 2...
January 6, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29315745/aspergillus-niger-mutants-affected-in-conidial-pigmentation-do-not-have-an-increased-susceptibility-to-water-stress-during-growth-at-low-water-activity
#13
Frank J J Segers, Han A B Wösten, Jan Dijksterhuis
Aspergillus niger forms conidia that contain melanin in their cell wall. This black pigment has been shown to protect fungi against UV-radiation and experimental evidence has indicated that it also protects against drought and high salt concentrations. In this study, growth of A. niger was evaluated at low water activity (aw ) and after changes in relative humidity (RH). In addition, deletion strains of A. niger affected in the melanin synthesis pathway were compared. Germination of conidia of the wild-type and deletion strains was observed at 0...
January 8, 2018: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29315607/the-solar-ultraviolet-environment-at-the-ocean
#14
Curtis D Mobley, Brian L Diffey
Atmospheric and oceanic radiative transfer models were used to compute spectral radiances between 285 and 400 nm onto horizontal and vertical plane surfaces over water. The calculations kept track of the contributions by the sun's direct beam, by diffuse sky radiance, by radiance reflected from the sea surface, and by water-leaving radiance. Clear, hazy, and cloudy sky conditions were simulated for a range of sun zenith angles, wind speeds, and atmospheric ozone concentrations. The radiances were used to estimate erythemal exposures due to the sun and sky, as well as from radiation reflected by the sea surface and backscattered from the water column...
January 8, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29315606/photochemistry-and-photophysics-of-shinorine-dimethyl-ester
#15
Dalila E Orallo, M Florencia Fangio, Martin Poblet, Mario O Carignan, Luis Bernal, José I Carreto, Sonia G Bertolotti, M Sandra Churio
The photostability and photophysical properties of the dimethyl ester of the mycosporine-like amino acid shinorine have been experimentally evaluated in aqueous solution and in the presence of direct micelles prepared with a cationic or an anionic detergent, respectively. In comparison with shinorine, the ester molecule increases the photostability, the fluorescence quantum yield and the fluorescence lifetime in water as well as in the micellar solutions. The effects are more pronounced in sodium dodecyl sulfate solutions and suggest that the electrostatic attractions with the micellar interface contribute to limit the movement of the molecules and influence the relative rate of their deactivation channels...
January 6, 2018: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29313597/vitamin-d-and-vitamin-d-receptor-in-patients-with-ophthalmic-pterygium
#16
Cristina Maxia, Daniela Murtas, Michela Corrias, Ignazio Zucca, Luigi Minerba, Franca Piras, Cristiana Marinelli, Maria Teresa Perra
Pterygium, an ultraviolet radiation (UV)-related disease, is a relatively benign process, but since it displays tumor-like features, it has been proposed to be a neoplastic- like growth disorder. Vitamin D performs a number of functions in addition to calcium homeostasis, as inhibition of cell proliferation, activation of apoptotic pathways, and inhibition of angiogenesis. Since the antitumor actions of vitamin D are mediated primarily through the nuclear vitamin D receptor (VDR), the aim of the present study was to investigate vitamin D status in patients with pterygium and in control subjects, and VDR immunohistochemical expression in samples of pterygium and normal conjunctiva in order to evaluate a possible role of vitamin D pathway in the pathogenesis of the disease...
October 30, 2017: European Journal of Histochemistry: EJH
https://www.readbyqxmd.com/read/29313410/ulk1-phosphorylates-ser30-of-becn1-in-association-with-atg14-to-stimulate-autophagy-induction
#17
Ji-Man Park, Minchul Seo, Chang Hwa Jung, Douglas Grunwald, Matthew Stone, Neil Michael Otto, Erik Toso, Yeseul Ahn, Michael Kyba, Timothy J Griffin, LeeAnn Higgins, Do-Hyung Kim
ULK1 (unc51-like autophagy activating kinase 1) is a serine/threonine kinase that plays a key role in regulating macroautophagy/autophagy induction in response to amino acid starvation. Despite the recent progress in understanding ULK1 functions, the molecular mechanism by which ULK1 regulates the induction of autophagy remains elusive. In this study, we determined that ULK1 phosphorylates Ser30 of BECN1 (beclin 1) in association with ATG14 (autophagy related 14) but not with UVRAG (UV radiation resistance associated)...
January 9, 2018: Autophagy
https://www.readbyqxmd.com/read/29313300/the-effect-of-educational-intervention-based-on-health-belief-model-and-social-support-on-promoting-skin-cancer-preventive-behaviors-in-a-sample-of-iranian-farmers
#18
Ali Khani Jeihooni, Tayebeh Rakhshani
Skin cancer is one of the most common cancers in Iran. Farmers are exposed to the sun's ultraviolet radiation due to their job and are susceptible to skin cancer. The aim of this study is to survey the effect of educational intervention based on health belief model and social support on promoting skin cancer preventive behaviors in farmers of Fasa City, Fars province, Iran. In this quasi-experimental study, 200 farmers (100 in experimental group and 100 in control group) in Fasa City, Fars, Iran, were selected in 2017...
January 8, 2018: Journal of Cancer Education: the Official Journal of the American Association for Cancer Education
https://www.readbyqxmd.com/read/29311422/morphology-control-of-rutile-tio2-with-tunable-bandgap-by-preformed-%C3%AE-feooh-nanoparticles
#19
Zheming Chen, Feng Wang, Subramanian Balachandran, Gen Li, Peng Liu, Yanfen Ding, Shimin Zhang, Mingshu Yang
Rutile TiO2 are widely used for applications of coatings, cosmetics and photoelectric devices, etc. However, effective control of well-defined mophology, size and composition of rutile TiO2 nanoparticles from agglomeration has always been a challenge. A new synthesis strategy was proposed to prepare rutile TiO2 with controllable morphology varied from flower like structure to single separated nanorods. The β FeOOH nanoparticles were generated by the hydrolysis of FeCl3 solution and could prevent the aggregation of TiO2 nanocrystals at early stage of the reaction thus controlled the morphology of rutile nanoparticles...
January 9, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29304901/indoor-tanning-a-gianus-bifrons-vitamin-d-and-human-cancer
#20
Giuseppe Lippi, Gianfranco Cervellin, Elisa Danese
Despite it is now undeniable that indoor tanning exposure is associated with a number of skin cancers, its favorable effects on vitamin D status may bear some underestimated and currently unexplored health benefits. Vitamin D is a fat-soluble vitamin naturally present in a limited number of foods, the concentration of which largely depends on ultraviolet (UV) B sources exposure in humans. A strong, graded, and inverse association has been documented between serum vitamin D and the risk of developing certain types of malignancy, especially colorectal, breast, lung, bladder, and kidney cancers...
2018: Advances in Clinical Chemistry
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