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https://www.readbyqxmd.com/read/28918122/pre-harvest-uv-c-irradiation-triggers-vocs-accumulation-with-alteration-of-antioxidant-enzymes-and-phytohormones-in-strawberry-leaves
#1
Yanqun Xu, Zisheng Luo, Marie Thérèse Charles, Daniel Rolland, Dominique Roussel
Recent studies have highlighted the biological and physiological effects of pre-harvest ultraviolet (UV)-C treatment on growing plants. However, little is known about the involvement of volatile organic compounds (VOCs) and their response to this treatment. In this study, strawberry plants were exposed to three different doses of UV-C radiation for seven weeks (a low dose: 9.6kJm(-2); a medium dose: 15kJm(-2); and a high-dose: 29.4kJm(-2)). Changes in VOC profiles were investigated and an attempt was made to identify factors that may be involved in the regulation of these alterations...
September 8, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28917186/compounds-isolated-from-eriobotrya-deflexa-leaves-protect-against-ultraviolet-radiation-b-induced-photoaging-in-human-fibroblasts
#2
Chung-Yu Huang, Yi-Tzu Lin, Hsiang-Chun Kuo, Wen-Fei Chiou, Mei-Hsien Lee
Ultraviolet (UV) irradiation leads to skin photoaging because of the upregulation of matrix metalloproteinase (MMP)-1 and downregulation of type I collagen and tissue inhibitor of metalloproteinase (TIMP)-1. Eriobotrya deflexa (Hemsl.) Nakai (Rosaceae) is a flowering plant endemic to Taiwan, and its leaves have been used as an expectorant and in antitussive folk remedy. Our previous studies have demonstrated that an E. deflexa leaf extract functions as a free radical scavenger. The current evaluated the antiphotoaging effect of partitioned fractions and specific compounds from the leaves of E...
September 4, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28915945/potentiometric-sensor-for-non-invasive-lactate-determination-in-human-sweat
#3
Massimo Onor, Stefano Gufoni, Tommaso Lomonaco, Silvia Ghimenti, Pietro Salvo, Fiodor Sorrentino, Emilia Bramanti
The present work describes a non invasive lactate sensing in sweat during workout. The sensing system is based on a non-equilibrium potentiometric measure performed using disposable, chemically modified, screen printed carbon electrodes (SPCEs) that can be wetted with sweat during the exercise. The potentiometric signal, which is proportional to lactate concentration in sweat, is produced by a redox reaction activated by UV radiation, as opposed to the enzymatic reaction employed in traditional, blood-based measuring devices...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28913680/uv-c-as-an-efficient-means-to-combat-biofilm-formation-in-show-caves-evidence-from-the-la-glaci%C3%A3-re-cave-france-and-laboratory-experiments
#4
Stéphane Pfendler, Olympe Einhorn, Battle Karimi, Faisl Bousta, Didier Cailhol, Laurence Alaoui-Sosse, Badr Alaoui-Sosse, Lotfi Aleya
Ultra-violet C (UV-C) treatment is commonly used in sterilization processes in industry, laboratories, and hospitals, showing its efficacy against microorganisms such as bacteria, algae, or fungi. In this study, we have eradicated for the first time all proliferating biofilms present in a show cave (the La Glacière Cave, Chaux-lès-Passavant, France). Colorimetric measurements of irradiated biofilms were then monitored for 21 months. To understand the importance of exposition of algae to light just after UV radiation, similar tests were carried out in laboratory conditions...
September 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28912118/topically-applied-carvedilol-attenuates-solar-ultraviolet-radiation-induced-skin-carcinogenesis
#5
Kevin M Huang, Sherry Liang, Steven Yeung, Etuajie Oiyemhonlan, Kristan H Cleveland, Cyrus Parsa, Robert Orlando, Frank L Meyskens, Bradley T Andresen, Ying Huang
In previous studies, the β-blocker carvedilol inhibited EGF-induced epidermal cell transformation and chemical carcinogen-induced mouse skin hyperplasia. As exposure to ultraviolet (UV) radiation leads to skin cancer, the present study examined whether carvedilol can prevent UV-induced carcinogenesis. Carvedilol absorbs UV like a sunscreen; thus, to separate pharmacological from sunscreen effects, 4-hydroxycarbazole (4-OHC), which absorbs UV to the same degree as carvedilol, served as control. JB6 P(+) cells, an established epidermal model for studying tumor promotion, were used for evaluating the effect of carvedilol on UV-induced neoplastic transformation...
August 15, 2017: Cancer Prevention Research
https://www.readbyqxmd.com/read/28906449/facile-preparation-of-a-robust-and-durable-superhydrophobic-coating-using-biodegradable-lignin-coated-cellulose-nanocrystal-particles
#6
Jingda Huang, Siqun Wang, Shaoyi Lyu
It is a challenge for a superhydrophobic coating to overcome the poor robustness and the rough surface structure that is usually built using inorganic particles that are difficult to degrade. In this study, a robust superhydrophobic coating is facilely prepared by using commercial biodegradable lignin-coated cellulose nanocrystal (L-CNC) particles after hydrophobic modification to build rough surface structures, and by choosing two different adhesives (double-sided tape and quick-setting epoxy) to support adhesion between the L-CNC particles and the substrates...
September 14, 2017: Materials
https://www.readbyqxmd.com/read/28900630/determination-of-vitamin-d-status-in-a-population-of-ecuadorian-subjects
#7
G Maldonado, C Paredes, R Guerrero, C Ríos
INTRODUCTION: Vitamin D is a preprohormone known to play a key role in phosphocalcic metabolism; its main source comes from the synthesis at the skin level by ultraviolet (UV) radiation. OBJECTIVE: The purpose of this study was to determine the levels of vitamin D in an Ecuadorian population. MATERIALS AND METHODS: Retrospective study of Ecuadorian subjects from the city of Guayaquil, who had an initial study of 25 (OH)-D serum, as the indicator of Vitamin D status, in the period of 2015-2016...
2017: TheScientificWorldJournal
https://www.readbyqxmd.com/read/28900534/resveratrol-enriched-rice-attenuates-uvb-ros-induced-skin-aging-via-downregulation-of-inflammatory-cascades
#8
Lalita Subedi, Taek Hwan Lee, Hussain Mustatab Wahedi, So-Hyeon Baek, Sun Yeou Kim
The skin is the outermost protective barrier between the internal and external environments in humans. Chronic exposure to ultraviolet (UV) radiation is a major cause of skin aging. UVB radiation penetrates the skin and induces ROS production that activates three major skin aging cascades: matrix metalloproteinase- (MMP-) 1-mediated aging; MAPK-AP-1/NF-κB-TNF-α/IL-6, iNOS, and COX-2-mediated inflammation-induced aging; and p53-Bax-cleaved caspase-3-cytochrome C-mediated apoptosis-induced aging. These mechanisms are collectively responsible for the wrinkling and photoaging characteristic of UVB-induced skin aging...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28895264/phenolic-compound-diversity-explored-in-the-context-of-photo-oxidative-stress-protection
#9
Kristóf Csepregi, Éva Hideg
INTRODUCTION: Phenolic compounds are a chemically diverse group of plant secondary metabolites with important roles both in plant stress defence and human nutrition. OBJECTIVE: To explore structure-function relations potentiating phenolic compounds to promote leaf acclimation to light stress by excess photosynthetically active radiation (photoinhibition) and by solar ultraviolet (UV) radiation. METHODOLOGY: We report singlet oxygen and hydrogen peroxide antioxidant capacities and UV-absorbing properties of 27 flavonoids and 11 phenolic acids...
September 12, 2017: Phytochemical Analysis: PCA
https://www.readbyqxmd.com/read/28894712/evaluation-of-the-level-of-zinc-and-malondialdehyde-in-basal-cell-carcinoma
#10
Ziba Majidi, Mahmoud Djalali, Mohammad Hasan Javanbakht, Mojtaba Fathi, Mahnaz Zarei, Koorosh Foladsaz
BACKGROUND: Basal Cell Carcinoma (BCC) is one of the most common skin cancers in the world and that use to lifestyle, increasing chemical pollutions, environmental factors and poor nutrition. The most important cause of this cancer is oxidative stress and free radicals so antioxidant activities for the body are so important. The aim of this study was to determine the variation of zinc and (Malondialdehyde) MDA in BCC patients. METHODS: This study has been performed on case and control patients from 2013 to 2014...
August 2017: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/28894626/ultraviolet-light-assisted-extraction-of-flavonoids-and-allantoin-from-aqueous-and-alcoholic-extracts-of-symphytum-officinale
#11
Marwan S M Al-Nimer, Zainab Wahbee
AIM: Symphytum officinale (comfrey) is a medicinal plant commonly used in decoction and to treat ailments. It protects the skin against ultraviolet (UV)-irradiation. UV irradiation may induce variable effects on the constituents of herbal extracts and thereby may limit or improve the advantages of using these extracts as medicinal supplements. This study aimed to assess the effect of UV radiations including UV-A, UV-B, and UV-C on the constituents of S. officinale aqueous and alcoholic extracts...
July 2017: Journal of Intercultural Ethnopharmacology
https://www.readbyqxmd.com/read/28894213/ultraviolet-radiation-induced-production-of-nitric-oxide-a-multi-cell-and-multi-donor-analysis
#12
Graham Holliman, Donna Lowe, Howard Cohen, Sarah Felton, Ken Raj
Increasing evidence regarding positive effects of exposure to sunlight has led to suggestions that current advice may be overly weighted in favour of avoidance. UV-A has been reported to lower blood pressure, possibly through nitric oxide (NO) production in skin. Here, we set out to investigate effects of UV-A and solar-simulated radiation on the potential source of dermal NO, the effective doses and wavelengths, the responsiveness of different human skin cells, the magnitude of inter-individual differences and the potential influence of age...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28893957/anti-inflammatory-role-of-langerhans-cells-and-apoptotic-keratinocytes-in-ultraviolet-b-induced-cutaneous-inflammation
#13
Mayumi Hatakeyama, Atsushi Fukunaga, Ken Washio, Kumiko Taguchi, Yoshiko Oda, Kanako Ogura, Chikako Nishigori
UV radiation, particularly UVB, is the major risk factor for the induction of skin cancer, and it induces skin inflammation and immunosuppression. Although reports documented that Langerhans cells (LCs) play various roles in photobiology, little is known about whether they contribute to UVB-induced cutaneous inflammation. Recently, the anti-inflammatory effect of apoptotic cells was noted. This study focuses on the roles of LCs and apoptotic cells in UVB-induced cutaneous inflammation. We show that LCs are essential for resolution of UVB-induced cutaneous inflammation...
September 11, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28888703/electrochemically-assisted-photocatalysis-highly-efficient-treatment-using-thermal-titanium-oxides-doped-and-non-doped-electrodes-for-water-disinfection
#14
Andreia Betina Kreuser Dos Santos, Elis Marina Turini Claro, Renato Nallin Montagnolli, Jaqueline Matos Cruz, Paulo Renato Matos Lopes, Ederio Dino Bidoia
Electrochemically assisted photocatalysis (by electronic drainage) is a highly promising method for disinfection of water. In this research, the efficiency of photolytic oxidation using UV-A radiation and electrochemically assisted photocatalysis (with electric potential of 1.5 V) was studied by using electrodes prepared by thermal treatment and doped with silver, for inactivation of Escherichia coli and Staphylococcus aureus. The Chick-Watson microorganism inactivation model was applied and the electrical energy consumption of the process was calculated...
September 7, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28887969/viability-of-hek-293-cells-on-poly-%C3%AE-hydroxybutyrate-phb-biosynthesized-from-a-mutant-azotobacter-vinelandii-strain-cast-film-and-electrospun-scaffolds
#15
Angel Romo-Uribe, Angelica Meneses-Acosta, Maraolina Domínguez-Díaz
Sterilization, cytotoxicity and cell viability are essential properties defining a material for medical applications and these characteristics were investigated for poly(β-hydroxybutyrate) (PHB) of 230kDa obtained by bacterial synthesis from a mutant strain of Azotobacter vinelandii. Cell viability was investigated for two types of PHB scaffolds, solution cast films and non-woven electrospun fibrous membranes, and the efficiency was compared against a culture dish. The biosynthesized PHB was sterilized by ultraviolet radiation and autoclave, it was found that the thermal properties and intrinsic viscosity remained unchanged indicating that the sterilization methods did not degrade the polymer...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28887475/noble-uv-protective-agent-for-bacillus-thuringiensis-based-on-a-combination-of-graphene-oxide-and-olive-oil
#16
Shahab Maghsoudi, Elham Jalali
The focus of this study is investigating the performance of graphene oxide (GO) in the protective effect of olive oil on Bacillus thuringiensis (Bt) after being exposed to UV radiations. Biological pesticides Bt subsp. Kurstaki is one of the most important biological control agents. We compared the protective effect of two UV protectant; GO and olive oil and also the combination of both, on the stability of the formulation of Bt after exposure to UV radiations. Spore viability was measured for protective effect and bioassay test was performed on the formulations of Bt...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28887295/photoaging-mobile-apps-in-school-based-melanoma-prevention-pilot-study
#17
Titus Josef Brinker, Christian Martin Brieske, Christoph Matthias Schaefer, Fabian Buslaff, Martina Gatzka, Maximilian Philip Petri, Wiebke Sondermann, Dirk Schadendorf, Ingo Stoffels, Joachim Klode
BACKGROUND: Around 90% of melanomas are caused by exposure to ultraviolet (UV) radiation and are therefore eminently preventable. Tanning behavior is mostly initiated in early adolescence, often with the belief that it increases attractiveness; the problems related to malignant melanoma and other skin cancers are too far in the future to fathom. Given the substantial amount of time children and adolescents spend in schools, as well as with their mobile phones, addressing melanoma prevention via both of these ways is crucial...
September 8, 2017: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/28886570/daily-light-integral-and-day-light-quality-potentials-and-pitfalls-of-nighttime-uv-treatments-on-cucumber-powdery-mildew
#18
Aruppillai Suthaparan, Knut Asbjørn Solhaug, Arne Stensvand, Hans Ragnar Gislerød
Nighttime ultraviolet (UV) radiation, if applied properly, has a significant potential for management of powdery mildews in many crop species. In this study, the role of growth light duration, irradiance, a combination of both (daily light integral) and light spectral quality (blue or red) on the efficacy of UV treatments against powdery mildew caused by Podosphaera xanthii and the growth performance of cucumber plants was studied in growth chambers. Increasing daily light integral provided by high-pressure sodium lamps (HPS) decreased efficacy of nighttime UV treatments against P...
September 1, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28885773/far-uv-excited-luminescence-of-nitrogen-vacancy-centers-evidence-for-diamonds-in-space
#19
Huan-Cheng Chang, Hsiao-Chi Lu, Yu-Chain Peng, Sheng-Lung Chou, Jen-Iu Lo, Bing-Ming Cheng
The nitrogen-vacancy (NV) centers in diamond are among the most thoroughly investigated defects in the solid state of matter; however, our understanding of their properties upon far-UV excitation of the host matrix is limited. The knowledge is crucial for the identification of NV as the carrier of extended red emission (ERE) bands detected in a wide range of astrophysical environments. Here, we report a study on the photoluminescence spectra of NV-containing nanodiamonds excited with synchrotron radiation over the wavelength range of 125 - 350 nm...
September 8, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28884844/an-open-label-clinical-trial-assessing-the-efficacy-and-safety-of-bend-skincare-anti-aging-formula-on-minimal-erythema-dose-in-skin
#20
Nancy L Morse, Anna-Jean Reid, Marc St-Onge
BACKGROUND/PURPOSE: Sunburn and other health risks associated with excess sun exposure place huge economic burdens on societies, and create discomfort and disease within susceptible individuals. Oral supplements that reduce sunburn may be advantageous. This study evaluated the safety and efficacy of Bend Skincare Anti-Aging Formula to ameliorate sunburn induced with a solar simulator. METHODS: Subjects (n= 28) with Fitzpatrick skin phototypes I, II or III took four capsules daily of the supplement providing 1400 mg of eicosapentaenoic acid (EPA)+ docosahexaenoic acid (DHA), 120 mg of gamma-linolenic acid (GLA), 5 mg of lutein, 2...
September 8, 2017: Photodermatology, Photoimmunology & Photomedicine
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