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https://www.readbyqxmd.com/read/28821091/simple-and-green-fabrication-of-agcl-ag-cellulose-paper-with-antibacterial-and-photocatalytic-activity
#1
Lin Dai, Rui Liu, Li-Qiu Hu, Chuan-Ling Si
A green in situ technique to prepare a kind of multifunctional hybrid paper, AgCl/Ag particles hybrid cellulose-paper (AgCl/Ag-paper), was established. The AgCl/Ag-paper was obtained from a facile ultrasound agitation procedure. Scanning electron microscope observation showed that AgCl/Ag particles were highly dispersed outside surface and inside of the paper matrix. The resultant AgCl/Ag-paper demonstrated satisfactory antibacterial activity and biocompatibility. Moreover, AgCl/Ag-paper showed good photocatalytic activity and stability for decomposing organic pollutants (methyl blue) under the direct sunlight...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820023/use-of-oxalic-acid-as-inducer-in-photocatalytic-oxidation-of-cresol-red-in-aqueous-solution-under-natural-and-artificial-light
#2
N Seraghni, I Ghoul, I Lemmize, A Reguig, N Debbache, T Sehili
This work was carried out in the field of water treatment using advanced oxidation processes (AOPs), especially photolysis of carboxylic acid leads to the formation in situ of hydroxyl radical ((.)OH). Cresol red (CR) degradation induced by organic acids/UV system was investigated in aqueous solution. The preliminary study of CR-organic acid mixture in the dark and at room temperature allowed confirming the absence of interaction under our experimental conditions. However, up on irradiation at 365 nm the percentage of elimination of CR was 89% after 5 hours of irradiation...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28816435/fiber-based-double-sided-reduced-graphene-oxide-films-for-efficient-solar-vapor-generation
#3
Ankang Guo, Xin Ming, Yang Fu, Gang Wang, Xianbao Wang
Solar vapor generation is a promising and whole new branch of photothermal conversion for harvesting solar energy. Various materials and devices for solar thermal conversion were successively produced and reported for higher solar energy utilization in the past few years. Herein, a compact device of reduced graphene oxides (rGO) and paper fibers was designed and assembled for efficient solar steam generation under light illumination, and it consists of water supply pipelines (WSP), a thermal insulator (TI) and a double-sided absorbing film (DSF)...
August 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28814448/carcinogen-susceptibility-is-regulated-by-genome-architecture-and-predicts-cancer-mutagenesis
#4
Pablo E García-Nieto, Erin K Schwartz, Devin A King, Jonas Paulsen, Philippe Collas, Rafael E Herrera, Ashby J Morrison
The development of many sporadic cancers is directly initiated by carcinogen exposure. Carcinogens induce malignancies by creating DNA lesions (i.e., adducts) that can result in mutations if left unrepaired. Despite this knowledge, there has been remarkably little investigation into the regulation of susceptibility to acquire DNA lesions. In this study, we present the first quantitative human genome-wide map of DNA lesions induced by ultraviolet (UV) radiation, the ubiquitous carcinogen in sunlight that causes skin cancer...
August 16, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28813031/pt-co-alloys-loaded-cubic-sic-electrode-with-improved-photoelectrocatalysis-property
#5
Dan Liu, Tao Yang, Junhong Chen, Kuo-Chih Chou, Xinmei Hou
A novel composite photocatalyst was synthesized by loading 5 wt % of platinum cobalt alloy on 3C-SiC nanowires and powder (Pt-Co-SiC) respectively via a simple polyol reduction method. Pt-Co-SiC were comprehensively characterized by SEM, HRTEM, XRD, PL, and XPS. The results indicated that Pt-Co nanoparticles in the size of 2-5 nm were dispersed homogeneously in the SiC nanowires and powders. The photocurrent response of the Pt-Co-SiC increased remarkably with increasing Pt content and the best performance was observed with the sample of Pt₃Co-SiC...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28812776/labelled-sunscreen-spfs-may-overestimate-protection-in-natural-sunlight
#6
Brian Diffey, Uli Osterwalder
Limited evidence exists to indicate that sunscreen protection factors determined in the laboratory are higher than those in natural sunlight. In this article we propose an explanation for this difference and estimate the expected SPFs of sunscreen products in natural sunlight and those expected from laboratory testing. Our results indicate that the labelled SPF, determined by in vivo assay using a UV solar simulator, overestimates the SPF that would be expected in natural sunlight to the extent that for products labelled SPF50+, it may not be possible to achieve a protection against sunlight of more than 25-fold...
August 16, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28812646/the-energy-expansions-of-evolution
#7
Olivia P Judson
The history of the life-Earth system can be divided into five 'energetic' epochs, each featuring the evolution of life forms that can exploit a new source of energy. These sources are: geochemical energy, sunlight, oxygen, flesh and fire. The first two were present at the start, but oxygen, flesh and fire are all consequences of evolutionary events. Since no category of energy source has disappeared, this has, over time, resulted in an expanding realm of the sources of energy available to living organisms and a concomitant increase in the diversity and complexity of ecosystems...
April 28, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28811780/role-of-vitamin-d-in-reducing-number-of-acute-exacerbations-in-chronic-obstructive-pulmonary-disease-copd-patients
#8
Dur Muhammad Khan, Aziz Ullah, Fawad Ahmad Randhawa, Somia Iqtadar, Nasir Farooq Butt, Khadija Waheed
BACKGROUND AND OBJECTIVE: Chronic obstructive pulmonary disease (COPD) is characterized by chronic incompletely reversible poor airflow and air trapping and usually this debilitating disorder limits the outside activities of the patients depriving them of sunlight which is a rich source of Vitamin D. The objective of this study was to determine the effect of vitamin D supplementation in reducing number of acute exacerbation in COPD patients. METHODS: This randomized control trial was conducted at East Medical Ward Mayo Hospital Lahore from January to December 2015 as exacerbations of COPD are season dependent...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28810229/photodegradation-of-sulfathiazole-under-simulated-sunlight-kinetics-photo-induced-structural-rearrangement-and-antimicrobial-activities-of-photoproducts
#9
Xi-Zhi Niu, Julie Glady-Croué, Jean-Philippe Croué
Photolysis is a core natural process impacting the fate of some sulfonamide antibiotics in sunlit waters. In this study, sunlight-induced phototransformation of sulfathiazole was investigated. A photolytic quantum yield of 0.079 was obtained in buffered water (pH = 8.0). Different natural organic matter isolates inhibited the photolysis of sulfathiazole by light screening effect. A kinetic model was developed to predict the photodegradation rate of sulfathiazole using the light screening correction factor of the water matrix in the wavelength range of 300-350 nm...
August 9, 2017: Water Research
https://www.readbyqxmd.com/read/28810137/time-gated-luminescence-imaging-of-singlet-oxygen-photoinduced-by-fluoroquinolones-and-functionalized-graphenes-in-daphnia-magna
#10
Tianlie Luo, Jingwen Chen, Bo Song, Hua Ma, Zhiqiang Fu, Willie J G M Peijnenburg
Singlet oxygen ((1)O2) can be photogenerated by photoactive xenobiotics and is capable of causing adverse effects due to its electrophilicity and its high reactivity with biological molecules. Detection of the production and distribution of (1)O2 in living organisms is therefore of great importance. In this study, a luminescent probe ATTA-Eu(3+) combined with time-gated luminescence imaging was adopted to detect the distribution and temporal variation of (1)O2 photoinduced by fluoroquinolone antibiotics and carboxylated/aminated graphenes in Daphnia magna...
July 29, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28810000/effect-of-a-blueberry-derived-antioxidant-matrix-on-infrared-a-induced-gene-expression-in-human-dermal-fibroblasts
#11
Susanne Grether-Beck, Jean Krutmann, Katherine Wilkens, Kasey D'Amato
<p>There is compelling evidence that Infrared A (IRA) from natural sunlight contributes to photoaging of human skin by inducing the expression of matrix metalloproteinase-1 (MMP-1) expression in human dermal fibroblasts. Corresponding mechanistic studies have shown that IRA does so by increasing the production of reactive oxygen species in irradiated cells. In the present study, we therefore asked if treatment of primary human skin fibroblasts with a blueberry-derived antioxidant matrix (BerrimatrixTM), which is employed as an active ingredient in commercially available skin care products that are topically applied, can prevent IRA-induced MMP-1 expression in these cells...
August 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28809411/a-monomeric-bowl-like-pyrogallol-4-arene-ti12-coordination-complex
#12
Kongzhao Su, Mingyan Wu, Yanxi Tan, Wenjing Wang, Daqiang Yuan, Maochun Hong
Herein, an unprecedented monomeric bowl-like coordination complex, Ti12PgC3 (PgC3 = C-propylpyrogallol[4]arene), has been successfully synthesized. To the best of our knowledge, Ti12PgC3 not only presents the first pyrogallol[4]arene-based titanium coordination complex, but also the highest nuclearity titanium coordination complex in the metal-calixarene system. In addition, this titanium coordination complex can effectively degrade the methylene blue (MB) dye under sunlight.
August 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28809104/large-scale-multifunctional-electrochromic-energy-storage-device-based-on-tungsten-trioxide-monohydrate-nanosheets-and-prussian-white
#13
Zhijie Bi, Xiaomin Li, Yongbo Chen, Xiaoli He, Xiaoke Xu, Xiang Dong Gao
A high-performance electrochromic-energy storage device (EESD) is developed, which successfully realizes the multifunctional combination of electrochromism and energy storage by constructing tungsten trioxide monohydrate (WO3●H2O) nanosheets and Prussian white (PW) film as asymmetric electrodes. The EESD presents excellent electrochromic properties of broad optical modulation (61.7%), ultrafast response speed (1.84/1.95 s) and great coloration efficiency (139.4 cm(2) C(-1)). In particular, remarkable cyclic stability (sustaining 82...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805371/wavelength-resolved-photon-fluxes-of-indoor-light-sources-implications-for-hox-production
#14
Shawn Finley Kowal, Seth Robert Allen, Tara F Kahan
Photochemistry is a largely-unconsidered potential source of reactive species such as hydroxyl and peroxy radicals (OH and HO2, "HOx") indoors. We present measured wavelength-resolved photon fluxes and distance dependences of indoor light sources including halogen, incandescent, and compact fluorescent lights (CFL) commonly used in residential buildings; fluorescent tubes common in industrial and commercial settings; and sunlight entering buildings through windows. We use these measurements to predict indoor HOx production rates from the photolysis of nitrous acid (HONO), hydrogen peroxide (H2O2), ozone (O3), formaldehyde (HCHO) and acetaldehyde (CH3CHO)...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28801660/bivo4-rgo-with-a-novel-structure-on-steel-fabric-used-as-high-performance-photocatalysts
#15
Dong Fang, Xiujuan Li, Hui Liu, Weilin Xu, Ming Jiang, Wenbin Li, Xin Fan
A high-performance and novel photocatalyst of BiVO4-reduced Graphene Oxide (BiVO4-rGO) nanocomposite was prepared by a facile hydrothermal method. The photocatalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electronic microscopy, UV-Vis diffusion reflectance spectroscopy, photoluminescence spectroscopy and UV-Vis adsorption spectroscopy, respectively. The visible-light photocatalytic activity was evaluated by oxidation of methyl orange (MO) under simulated sunlight irradiation...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800215/c-fibers-wse2-nanoplates-core-shell-composite-highly-efficient-solar-driven-photocatalyst
#16
Hong Li, Zhijian Peng, Jingwen Qian, Meng Wang, Chengbiao Wang, Xiuli Fu
Recently, WSe2 as a typical transition metal dichalcogenide compound has attracted extensive attention due to its potential applications in electronic and optoelectronic devices. However, WSe2 alone cannot be directly used as a photocatalyst due to its inferior performance possibly caused by the strong recombination of photogenerated electron-hole pairs. Here a novel C fibers@WSe2 nanoplates core-shell composite (NPCSC) was successfully synthesized via facile, one-step thermal evaporation, in which numerous WSe2 thin nanoplates were in situ, densely and even vertically grown on the surface of the C fibers...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28799772/optoelectronic-properties-of-semiconductor-quantum-dot-solids-for-photovoltaic-applications
#17
Alexander A Chistyakov, Mariya A Zvaigzne, Vladimir R Nikitenko, Alexey R Tameev, Igor L Martynov, Oleg V Prezhdo
Quantum dot (QD) solids represents a new type of condensed matter that is highly relevant from both fundamental and applied points of view. The properties of QD solids are qualitatively different from those of the traditional solids, and their unique characteristics give rise to promising applications. The combination of quantum confinement in individual QDs with macroscopic scale of the whole material leads to novel features of electronic excitations (excitons) and charge transfer processes, which are of great interest for optoelectronic applications...
August 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28795743/sunlight-decatungstate-photoinduced-trifluoromethylations-of-hetero-aromatics-and-electron-poor-olefins
#18
Sara Corsico, Maurizio Fagnoni, Davide Ravelli
Tetrabutylammonium decatungstate has been exploited to photoinduce the trifluoromethylation of (hetero)aromatics and electron-poor olefins. The process made use of the cheap Langlois' reagent (CF3SO2Na) and occurred under sunlight irradiation in an acetonitrile/water mixture. The trifluoromethylation of (hetero)aromatics required the use of potassium persulfate as an additive and the mono- or bis-trifluoromethylated adducts were obtained, depending on the actual reaction conditions and the chosen substrate.
August 10, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28793001/hypovitaminosis-d-in-patients-undergoing-kidney-transplant-the-importance-of-sunlight-exposure
#19
Cristiane F Vilarta, Marianna D Unger, Luciene M Dos Reis, Wagner V Dominguez, Elias David-Neto, Rosa M Moysés, Silvia Titan, Melani R Custodio, Mariel J Hernandez, Vanda Jorgetti
OBJECTIVES: Recent studies have shown a high prevalence of hypovitaminosis D, defined as a serum 25-hydroxyvitamin D level less than 30 ng/ml, in both healthy populations and patients with chronic kidney disease. Patients undergoing kidney transplant are at an increased risk of skin cancer and are advised to avoid sunlight exposure. Therefore, these patients might share two major risk factors for hypovitaminosis D: chronic kidney disease and low sunlight exposure. This paper describes the prevalence and clinical characteristics of hypovitaminosis D among patients undergoing kidney transplant...
July 2017: Clinics
https://www.readbyqxmd.com/read/28783299/in-situ-generation-of-photosensitive-silver-halide-for-improving-the-conductivity-of-electrically-conductive-adhesives
#20
Chaowei Li, Qiulong Li, Xiaoyang Long, Taotao Li, Jingxin Zhao, Kai Zhang, Songfeng E, Jun Zhang, Zhuo Li, Yagang Yao
Electrically conductive adhesives (ECAs) can be regarded as one of the most promising materials to replace Sn/Pb solder. However, relatively low conductivity seriously restricts their applications. In the present study, we develop an effective method to decrease the bulk electrical resistivity of ECAs. KI or KBr is added to replace the lubricant and silver oxide layer on silver flakes and to form photosensitive silver halide. After exposing to sunlight, silver halide can photo-decompose into silver nanoparticles that will sinter and form metallic bonding between/among flakes during the curing process of ECAs, which would remarkably reduce the resistivity...
August 7, 2017: ACS Applied Materials & Interfaces
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