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https://www.readbyqxmd.com/read/29351225/a-composite-photocatalyst-based-on-hydrothermally-synthesized-cu%C3%A2-znsns%C3%A2-powders
#1
Shih-Jen Lin, Jyh-Ming Ting, Kuo-Chin Hsu, Yaw-Shyan Fu
A novel composite photocatalyst based on Cu₂ZnSnS₄ (CZTS) powders was synthesized and investigated for use as a photocatalyst. CZTS powders were first made using a conventional hydrothermal method and were then used to grow silver nanoparticles hybridized onto the CZTS under various conditions through a microwave-assisted hydrothermal process. After the obtained samples were subsequently mixed with 1T-2H MoS₂, the three synthesized component samples were characterized using X-ray diffractometry (XRD), scanning electron microscopy, transmission electron microscopy (FE-SEM, FE-TEM), UV-visible spectroscopy (UV-Vis), Brunauer-Emmet-Teller (BET), photoluminescence spectroscopy (PL), and X-ray photoelectron spectroscopy (XPS)...
January 19, 2018: Materials
https://www.readbyqxmd.com/read/29343764/genome-wide-association-study-in-79-366-european-ancestry-individuals-informs-the-genetic-architecture-of-25-hydroxyvitamin-d-levels
#2
Xia Jiang, Paul F O'Reilly, Hugues Aschard, Yi-Hsiang Hsu, J Brent Richards, Josée Dupuis, Erik Ingelsson, David Karasik, Stefan Pilz, Diane Berry, Bryan Kestenbaum, Jusheng Zheng, Jianan Luan, Eleni Sofianopoulou, Elizabeth A Streeten, Demetrius Albanes, Pamela L Lutsey, Lu Yao, Weihong Tang, Michael J Econs, Henri Wallaschofski, Henry Völzke, Ang Zhou, Chris Power, Mark I McCarthy, Erin D Michos, Eric Boerwinkle, Stephanie J Weinstein, Neal D Freedman, Wen-Yi Huang, Natasja M Van Schoor, Nathalie van der Velde, Lisette C P G M de Groot, Anke Enneman, L Adrienne Cupples, Sarah L Booth, Ramachandran S Vasan, Ching-Ti Liu, Yanhua Zhou, Samuli Ripatti, Claes Ohlsson, Liesbeth Vandenput, Mattias Lorentzon, Johan G Eriksson, M Kyla Shea, Denise K Houston, Stephen B Kritchevsky, Yongmei Liu, Kurt K Lohman, Luigi Ferrucci, Munro Peacock, Christian Gieger, Marian Beekman, Eline Slagboom, Joris Deelen, Diana van Heemst, Marcus E Kleber, Winfried März, Ian H de Boer, Alexis C Wood, Jerome I Rotter, Stephen S Rich, Cassianne Robinson-Cohen, Martin den Heijer, Marjo-Riitta Jarvelin, Alana Cavadino, Peter K Joshi, James F Wilson, Caroline Hayward, Lars Lind, Karl Michaëlsson, Stella Trompet, M Carola Zillikens, Andre G Uitterlinden, Fernando Rivadeneira, Linda Broer, Lina Zgaga, Harry Campbell, Evropi Theodoratou, Susan M Farrington, Maria Timofeeva, Malcolm G Dunlop, Ana M Valdes, Emmi Tikkanen, Terho Lehtimäki, Leo-Pekka Lyytikäinen, Mika Kähönen, Olli T Raitakari, Vera Mikkilä, M Arfan Ikram, Naveed Sattar, J Wouter Jukema, Nicholas J Wareham, Claudia Langenberg, Nita G Forouhi, Thomas E Gundersen, Kay-Tee Khaw, Adam S Butterworth, John Danesh, Timothy Spector, Thomas J Wang, Elina Hyppönen, Peter Kraft, Douglas P Kiel
Vitamin D is a steroid hormone precursor that is associated with a range of human traits and diseases. Previous GWAS of serum 25-hydroxyvitamin D concentrations have identified four genome-wide significant loci (GC, NADSYN1/DHCR7, CYP2R1, CYP24A1). In this study, we expand the previous SUNLIGHT Consortium GWAS discovery sample size from 16,125 to 79,366 (all European descent). This larger GWAS yields two additional loci harboring genome-wide significant variants (P = 4.7×10-9 at rs8018720 in SEC23A, and P = 1...
January 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29343279/spatial-distribution-and-habitat-characterization-of-mosquito-species-during-the-dry-season-along-the-mara-river-and-its-tributaries-in-kenya-and-tanzania
#3
Gabriel O Dida, Douglas N Anyona, Paul O Abuom, Daniel Akoko, Samson O Adoka, Ally-Said Matano, Philip O Owuor, Collins Ouma
BACKGROUND: Vector-borne diseases are increasingly becoming a major health problem among communities living along the major rivers of Africa. Although larger water bodies such as lakes and dams have been extensively researched, rivers and their tributaries have largely been ignored. This study sought to establish the spatial distribution of mosquito species during the dry season and further characterize their habitats along the Mara River and its tributaries. METHODS: In this cross-sectional survey, mosquito larvae were sampled along the Mara River, its two perennial tributaries (Amala and Nyangores), drying streams, and adjacent aquatic habitats (e...
January 18, 2018: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/29335510/tio2-nanoribbons-carbon-nanotubes-composite-with-enhanced-photocatalytic-activity-fabrication-characterization-and-application
#4
Mohamed Shaban, Abdallah M Ashraf, Mostafa R Abukhadra
TiO2 nanoribbons (TiO2 NRs) loaded with FeCo-Al2O3 catalyst were synthesized and used as a precursor in the synthesis of TiO2 nanoribbons/carbon nanotubes (TiO2 NRs/CNTs) composite by a chemical vapor deposition (CVD) method. TiO2 NRs and TiO2 NRs/CNTs composite were characterized by XRD, FT-IR, TEM, SEM, EDX and UV-Vis spectrophotometer. The results revealed the formation of TiO2-B and hydrogen titanate nanoribbon like structures by the hydrothermal treatment. After loading TiO2 NRs by FeCo-Al2O3 catalyst and the CVD growth of carbon nanotubes, the synthetic TiO2 nanoribbons converted entirely to TiO2-B nanoribbons with nanopits structure...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29335221/highly-efficient-solar-driven-photocatalytic-degradation-on-environmental-pollutants-over-a-novel-c-fibers-mose2-nanoplates-core-shell-composite
#5
Meng Wang, Zhijian Peng, Jingwen Qian, Hong Li, Zengying Zhao, Xiuli Fu
As an important member of two-dimensional transition metal dichalcogenides, MoSe2 has a wide range of photoelectrochemical properties. However, MoSe2 alone can not directly be used as photocatalyst for its poor performance owing to the strong recombination of photogenerated electron-hole pairs. Here, we propose a novel C fibers@MoSe2 nanoplates core-shell composite, which was prepared by a facile, one-step thermal evaporation method. The composite has a remarkable feature of numerous MoSe2 thin nanoplates grown in-situ, densely and even vertically on the surface of the C fibers...
January 10, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29329009/well-controlled-in-situ-growth-of-2d-wo3-rectangular-sheets-on-reduced-graphene-oxide-with-strong-photocatalytic-and-antibacterial-properties
#6
Bilal Ahmed, Animesh K Ojha, Ajeet Singh, Florian Hirsch, Ingo Fischer, Donfack Patrice, Arnulf Materny
Finding the materials, which help to control the water pollution caused by organic and bacterial pollutants is one of the challenging tasks for the scientific community. 2D sheets of WO3 and composite of WO3 and reduced graphene oxide (rGO) have been synthesized in a well-controlled way using a hydrothermal method. The as synthesized 2D sheet of WO3 and rGO-WO3 composite were characterized by various techniques. The 2D sheets of WO3 and rGO-WO3 composite are efficiently utilized for the photocatalytic degradation of methylene blue (MB) and Rhodamine B (RhB) dyes under sunlight...
December 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29327753/recyclable-fe3o4-nayf4-yb-tm-tio2-nanocomposites-with-near-infrared-enhanced-photocatalytic-activity
#7
Yan Lv, Lin Yue, Qian Li, Baoyi Shao, Sen Zhao, Haitao Wang, Shijia Wu, Zhouping Wang
Herein, the design and synthesis of a multifunctional (Fe3O4-NaYF4:Yb,Tm)@TiO2 photocatalyst through a facile sol-gel process combined with electrostatic self-assembly has been reported. Particularly, as an upconversion sensor, NaYF4:Yb,Tm nanoparticles have the ability to convert near-infrared (NIR) light into ultraviolet (UV) emissions, so that the catalytic body TiO2 can indirectly utilize the NIR part of sunlight but not UV light. The excellent photocatalytic activity of the hybrid samples is evaluated using a model of the degradation of methylene blue (MB)...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29327230/alcohol-alcoholic-beverages-and-melanoma-risk-a-systematic-literature-review-and-dose-response-meta-analysis
#8
REVIEW
Sara Gandini, Giovanna Masala, Domenico Palli, Benedetta Cavicchi, Calogero Saieva, Ilaria Ermini, Federica Baldini, Patrizia Gnagnarella, Saverio Caini
PURPOSE: Several studies in recent years have investigated the relationship between alcohol intake and melanoma risk, with conflicting results. To help clarify this issue, we conducted a literature review and dose-response meta-analysis of studies published until June 30th, 2017, that examined the association between alcohol intake (overall and by beverage type) and melanoma risk. METHODS: We used random effect models with maximum likelihood estimation to calculate summary relative risk (SRR) and 95% confidence intervals (95%CI)...
January 11, 2018: European Journal of Nutrition
https://www.readbyqxmd.com/read/29325823/photo-geno-toxicity-changes-associated-with-hydroxylation-of-the-aromatic-chromophores-during-diclofenac-metabolism
#9
Guillermo Garcia-Lainez, Ana M Martínez-Reig, Daniel Limones-Herrero, M Consuelo Jiménez, Miguel A Miranda, Inmaculada Andreu
Diclofenac (DCF) can cause adverse reactions such as gastrointestinal, renal and cardiovascular disorders; therefore, topical administration may be an attractive alternative to the management of local pain in order to avoid these side effects. However, previous studies have shown that DCF, in combination with sunlight, displays capability to induce photosensitivity disorders. In humans, DCF is biotransformed into hydroxylated metabolites at positions 4' and 5 (4'OH-DCF and 5OH-DCF), and this chemical change produces non negligible alterations of the drug chromophore, resulting in a significant modification of its light-absorbing properties...
January 8, 2018: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29325163/trans-ethnic-evaluation-identifies-novel-low-frequency-loci-associated-with-25-hydroxyvitamin-d-concentrations
#10
Jaeyoung Hong, Kathryn E Hatchell, Jonathan P Bradfield, Bjonnes Andrew, Chesi Alessandra, Lai Chao-Qiang, Carl D Langefeld, Lingyi Lu, Yingchang Lu, Pamela L Lutsey, Solomon K Musani, Mike A Nalls, Cassianne Robinson-Cohen, Jeffery D Roizen, Richa Saxena, Katherine L Tucker, Julie T Ziegler, Dan E Arking, Joshua C Bis, Eric Boerwinkle, Erwin P Bottinger, Donald W Bowden, Vincente Gilsanz, Denise K Houston, Heidi J Kalkwarf, Andrea Kelly, Joan M Lappe, Yongmei Liu, Erin D Michos, Sharon E Oberfield, Nicholette D Palmer, Jerome I Rotter, Bishwa Sapkota, John A Shepherd, James G Wilson, Saonli Basu, Ian H de Boer, Jasmin Divers, Barry I Freedman, Struan F A Grant, Hakon Hakanarson, Tamara B Harris, Bryan R Kestenbaum, Stephen B Kritchevsky, Ruth J F Loos, Jill M Norris, Arnita F Norwood, Jose M Ordovas, James S Pankow, Bruce M Psaty, Dharambir K Sanhgera, Lynne E Wagenknecht, Babette S Zemel, James Meigs, Josée Dupuis, Jose C Florez, Thomas Wang, Ching-Ti Liu, Corinne D Engelman, Liana K Billings
Context: Vitamin D inadequacy is common in the adult population of the United States. While the genetic determinants underlying vitamin D inadequacy have been studied in people of European ancestry, less is known in Hispanic or African ancestry populations. Objective: The TRANSCEN-D (TRANS-ethniC Evaluation of vitamiN D GWAS) consortium was assembled to replicate genetic associations with 25-hydroxyvitamin D (25(OH)D) concentrations from the meta-analyses of European ancestry (SUNLIGHT) and to identify novel genetic variants related to vitamin D concentrations in African and Hispanic ancestries...
January 9, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29323907/ultrathin-semiconducting-bi2te2s-and-bi2te2se-with-high-electron-mobilities
#11
Bing Wang, Xianghong Niu, Yixin Ouyang, Qionghua Zhou, Jinlan Wang
High carrier mobility and moderate band gap are two key properties of electronic device applications. Two ultrathin two-dimensional (2D) semiconductors, namely Bi2Te2S and Bi2Te2Se nanosheets, with novel electronic and optical properties are predicted based on first-principles calculations. The Bi2Te2S and Bi2Te2Se monolayers own moderate band gaps (~ 0.7 eV) and high electronic mobilities (20000 cm2V-1s-1); and they can absorb sunlight efficiently through the whole incident solar spectrum. Meanwhile, layer-dependent exponential decay band gaps are also unveiled...
January 11, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29323883/a-stable-blue-photosensitizer-for-color-palette-of-dye-sensitized-solar-cells-reaching-12-6-efficiency
#12
Yameng Ren, Danyang Sun, Yiming祎明 Cao曹, Hoi Nok Tsao, Yi Yuan, Shaik M Zakeeruddin, Peng Wang, Michael Grätzel
We report a blue donor-acceptor organic dye, coded as R6, which features a primary chromophore of a polycyclic aromatic hydrocarbon 9,19-dihydrobenzo[1',10']phenanthro[3',4':4,5]thieno[3,2-b]benzo[1,10]phenanthro[3,4-d]thiophene (BPT2) coupled with a diarylamine electron-donor and 4-(7-ethynylbenzo[c][1,2,5]thiadiazol-4-yl)benzoic acid acceptor. Dye R6 displays a brilliant sapphire color on a sensitized titania mesoporous film together with a Co(II/III)tris(bipyridyl)-based redox electrolyte. Significantly, such judiciously tailored DSCs achieve an impressive solar-to-electric power conversion efficiency (PCE) of 12...
January 11, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29323733/photo-induced-toxicity-following-exposure-to-crude-oil-and-ultraviolet-radiation-in-two-australian-fishes
#13
Lauren E Sweet, Andrew T Revill, Joanna Strzelecki, Sharon E Hook, Jeffrey M Morris, Aaron P Roberts
Some polycyclic aromatic hydrocarbons (PAHs), a component of crude oil, are known to cause increased toxicity when organisms are co-exposed with ultraviolet radiation, resulting in photo-induced toxicity. The photodynamic characteristic of some PAHs are of particular concern to places like Australia with high ultraviolet radiation levels. The objective of this study was to characterize the photo-induced toxicity of an Australian Northwest Shelf oil to early life stage yellowtail kingfish (Seriola lalandi) and black bream (Acanthopagrus butcheri)...
January 11, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29323155/canopy-nitrogen-distribution-is-optimized-to-prevent-photoinhibition-throughout-the-canopy-during-sun-flecks
#14
Mitsutoshi Kitao, Satoshi Kitaoka, Hisanori Harayama, Hiroyuki Tobita, Evgenios Agathokleous, Hajime Utsugi
As photoinhibition primarily reduces the photosynthetic light use efficiency at low light, sunfleck-induced photoinhibition might result in a fatal loss of carbon gain in the shade leaves within a canopy with barely positive carbon balance. We hypothesized that shade leaves at the lower canopy might retain a certain amount of leaf nitrogen (NL) to maintain energy consumption via electron transport, which contributes to circumventing photoinhibition during sunflecks to keep efficient utilization of low light during the rest period of daytime...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29321491/selective-6h-sic-white-light-emission-by-picosecond-laser-direct-writing
#15
Sicong Wang, Lingfei Ji, Lin Li, Yan Wu, Yongzhe Zhang, Zhenyuan Lin
Displaying a full or tuneable emission spectrum with highly efficient is significant for luminescent materials used in solid-state lighting. Silicon carbide (SiC) has potential for use in photoelectric devices that operate under extreme conditions. In this paper, we present a method to selectively modify the photoluminescence (PL) properties of SiC by ultrafast laser direct writing. Based on this method, visible white PL could be observed by the naked eye at room temperature under ultraviolet excitation. By increasing the laser power intensity from 40 to 80 MW/cm2, the PL of the irradiated samples increased and pure white sunlight-like emission with controlled colour temperature was realised...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29318635/plant-evolution-landmarks-on-the-path-to-terrestrial-life
#16
REVIEW
Jan de Vries, John M Archibald
Contents I. II. III. IV. ORCID References SUMMARY: Photosynthetic eukaryotes thrive anywhere there is sunlight and water. But while such organisms are exceptionally diverse in form and function, only one phototrophic lineage succeeded in rising above its substrate: the land plants (embryophytes). Molecular phylogenetic data show that land plants evolved from streptophyte algae most closely related to extant Zygnematophyceae, and one of the principal aims of plant evolutionary biology is to uncover the key features of such algae that enabled this important transition...
January 10, 2018: New Phytologist
https://www.readbyqxmd.com/read/29316545/survival-of-viruses-in-water
#17
Anthony Pinon, Michèle Vialette
Water, a frequent vehicle for the transmission of viruses, may permit their survival, but many environmental factors will have an adverse effect on the viral population. Risk evaluation requires identification of these factors and assessment of the inactivation rate of infectious viruses. A higher temperature means a faster reduction of the viral population, as do increased sunlight, higher antimicrobial concentration, or higher oxygen levels. Another documented impact is linked to the presence of indigenous microbial populations: virus survival is higher in sterile water...
January 10, 2018: Intervirology
https://www.readbyqxmd.com/read/29316534/noble-metal-sandwich-like-tio2-pt-c3n4-hollow-spheres-enhance-photocatalytic-performance
#18
Jiabai Cai, Xueqing Wu, Yuehai Li, Ye Lin, Hui Yang, Shunxing Li
The goal of this work was to assess the performance of Pt nanoparticles (NPs) as co-catalysts on the photocatalytic activity of TiO2@Pt@C3N4 hollow spheres, which was tested by photodegrading rhodamine B and methyl blue under visible light irradiation. TiO2@Pt@C3N4 composites were fabricated by using modified polystyrene balls as templates, hydrothermal reactions, and calcination. Under simulated sunlight irradiation, photocatalytic activity was in the following of TiO2@Pt@C3N4 > TiO2@C3N4 > C3N4 > P25...
January 4, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29315517/role-of-respiratory-terminal-oxidases-in-the-extracellular-electron-transfer-ability-of-cyanobacteria
#19
Narendran Sekar, Jian Wang, Yan Zhou, Yi Fang, Yajun Yan, Ramaraja P Ramasamy
Cyanobacteria are used as anode catalysts in photo-bioelectrochemical cells to generate electricity in a sustainable, economic and environmental friendly manner using only water and sunlight. Though cyanobacteria (CB) possess unique advantage for solar energy conversion by virtue of its robust photosynthesis, they cannot efficiently perform extracellular electron transfer (EET). The reasons being, unlike dissimilatory metal reducing bacteria (that are usually exploited in microbial fuel cells to generate electricity), (1) CB do not possess any special features on their outer membrane to carry out EET and (2) the electrons generated in photosynthetic electron transport chain are channeled into competing respiratory pathways rather than to the anode...
January 8, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29315024/ozone-exposure-and-pulmonary-effects-in-panel-and-human-clinical-studies-considerations-for-design-and-interpretation
#20
A C Rohr
A wealth of literature exists regarding the pulmonary effects of ozone, a photochemical pollutant produced by the reaction of nitrogen oxide and volatile organic precursors in the presence of sunlight. This paper focuses on epidemiological panel studies and human clinical studies of ozone exposure, and discusses issues specific to this pollutant that may influence study design and interpretation as well as other, broader considerations relevant to ozone-health research. The issues are discussed using examples drawn from the wider literature...
January 9, 2018: Journal of the Air & Waste Management Association
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