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https://www.readbyqxmd.com/read/28342991/transformation-of-17%C3%AE-ethinylestradiol-by-simultaneous-photo-enzymatic-process-in-humic-water
#1
Yun Yang, Jianhua Li, Kun Lu, Huanhuan Shi, Shixiang Gao
The fate of estrogens in surface water is mainly dependent on two processes, i.e. photodegradation and biotransformation. Each of the separate process is invariably of interest, but research on the combination of the two processes has rarely been explored. In the present work, the transformation of 17α-ethinylestradiol (EE2) by simultaneous photochemical and enzymatic process in water was systematically investigated. The combined transformation rate of EE2 (0.057 h(-1)) in the presence of natural organic matter (NOM) and horseradish peroxidase (HRP) under simulated sunlight irradiation was markedly faster than that in the presence of NOM only (0...
March 23, 2017: Chemosphere
https://www.readbyqxmd.com/read/28342848/ultraviolet-a-induced-oxidation-in-cornea-characterization-of-the-early-oxidation-related-events
#2
Corinne Zinflou, Patrick J Rochette
Exposure to sunlight ultraviolet-A (UVA), the main component of solar UV reaching the eyes, is suspected to play an important part in the onset of ocular pathologies. UVA primary biological deleterious effects arise from the photo-induction of oxidative stress in cells. However, the molecular bases linking UVA-induced oxidation to UVA toxicity in eyes remain poorly understood, especially with regards to the cornea. To shed some light on this issue, we have investigated the susceptibility and response potential of the different corneal cellular layers (epithelium, stroma and endothelium) to UVA-induced oxidation...
March 22, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28342689/induction-of-out-of-season-egg-laying-by-artificial-photoperiod-in-yangzhou-geese-and-the-associated-endocrine-and-molecular-regulation-mechanisms
#3
Huanxi Zhu, Xibing Shao, Zhe Chen, Chuankun Wei, Mingming Lei, Shijia Ying, Jianning Yu, Zhendan Shi
This study was carried out to induce out-of-season breeding, in the summer, and to achieve high reproductive performance using artificial photoperiod manipulation in the long-day breeding Yangzhou goose. Young geese were subject to a two-phase short-to-long (group A) or a three-phase (long-short-long; group B) photoperiod program February through October. Egg-laying was induced to start similarly in both groups in May, increased to a peak level in July, and then decreased gradually through to October. The peak and post-peak laying rates were higher with the three-phase than with the two-phase program...
March 18, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28340419/photolytic-degradation-of-the-%C3%AE-blocker-nebivolol-in-aqueous-solution
#4
Alaa Salma, Holger V Lutze, Torsten C Schmidt, Jochen Tuerk
Nebivolol (NEB) is one of the top-sold prescription drugs belonging to the third generation of beta-blockers. However, so far, occurrence data in the environment are lacking. Within this study NEB has been found for the first time in effluent samples of wastewater treatment plants in Germany with an average concentration of 13 ng L(-1). Its photodegradation behavior in the environment and in technical processes is largely unknown. To fill this gap, three different UV treatment procedures (UV-C at 254 nm, UV-B at 312 nm and UV-A at 365 nm) were investigated in three different matrices: pure water, pure water in presence of the hydroxyl radical (OH) scavenger tert...
March 13, 2017: Water Research
https://www.readbyqxmd.com/read/28339754/expression-of-deep-brain-photoreceptors-in-the-pekin-drake-a-possible-role-in-the-maintenance-of-testicular-function
#5
R Haas, E Alenciks, S Meddle, G S Fraley
Several putative deep brain photoreceptors (DBPs) have been identified, such as melanopsin, opsin 5, and vertebrate ancient opsin. The aim of this study was to elucidate the role of DBPs in gonadal regulation in the Pekin drake. As previously reported, we observed opsin-like immunoreactivity (-ir) in the lateral septum (LS), melanopsin-ir in the premammillary nucleus (PMM), and opsin 5-ir in the periventricular organ. To determine the sensitivity of the DBPs to specific wavelengths of light, drakes were given an acute exposure to red, blue, or white light...
February 23, 2017: Poultry Science
https://www.readbyqxmd.com/read/28338935/impact-of-the-ion-transportome-of-chloroplasts-on-the-optimization-of-photosynthesis
#6
Ildikò Szabò, Cornelia Spetea
Ions play fundamental roles in all living cells, and their gradients are often essential to fuel transport, regulate enzyme activities, and transduce energy within cells. Regulation of their homeostasis is essential for cell metabolism. Recent results indicate that modulation of ion fluxes might also represent a useful strategy to regulate one of the most important physiological processes taking place in chloroplasts, photosynthesis. Photosynthesis is highly regulated, due to its unique role as a cellular engine for growth in the light...
March 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28338850/photo-documentation-in-the-community-reflections-on-genetics-health-and-health-disparities
#7
Laura Morello, Patricia A Marshall, Christopher D Hartmann, Sanjur Brooks, Kari Colón-Zimmermann, Aaron J Goldenberg
No abstract text is available yet for this article.
February 27, 2017: International Journal of Epidemiology
https://www.readbyqxmd.com/read/28337979/monolayer-optical-memory-cells-based-on-artificial-trap-mediated-charge-storage-and-release
#8
Juwon Lee, Sangyeon Pak, Young-Woo Lee, Yuljae Cho, John Hong, Paul Giraud, Hyeon Suk Shin, Stephen M Morris, Jung Inn Sohn, SeungNam Cha, Jong Min Kim
Monolayer transition metal dichalcogenides are considered to be promising candidates for flexible and transparent optoelectronics applications due to their direct bandgap and strong light-matter interactions. Although several monolayer-based photodetectors have been demonstrated, single-layered optical memory devices suitable for high-quality image sensing have received little attention. Here we report a concept for monolayer MoS2 optoelectronic memory devices using artificially-structured charge trap layers through the functionalization of the monolayer/dielectric interfaces, leading to localized electronic states that serve as a basis for electrically-induced charge trapping and optically-mediated charge release...
March 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28337971/semiconductor-meta-surface-based-perfect-light-absorber
#9
Guiqiang Liu, Yiyou Nie, Guolan Fu, Xiaoshan Liu, Yi Liu, Li Tang, Zhengqi Liu
We numerically proposed and demonstrated a semiconductor meta-surface light absorber, which consists of a silicon patches array on a silicon thin-film and an opaque silver substrate. The Mie resonances of the silicon patches and the fundamental cavity mode of the ultra-thin silicon film couple strongly to the incident optical field, leading to a multi-band perfect absorption. The maximal absorption is above 99.5% and the absorption is polarization-independent. Moreover, the absorption behavior is scalable in the frequency region via tuning the structural parameters...
April 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28337898/melanin-of-the-nipple-areola-complex
#10
A Goren, M Kovacevic, T Lotti
Biological pigments or biochromes are ubiquitous in animals, plants, and simpler organisms such as fungi and bacteria. They serve a wide spectrum of functions from photosynthesis, camouflage, mimicry, photo protection from the environment to attracting mates. The human female nipple areola complex (NAC) is a highly-pigmented area. Currently, the prevailing theory as to the evolution of the pigmented human NAC is based on infant recognition of breast feeding latching zone; however, due to the protruding shape of the nipple and surrounding breast, the authors of this letter believe that the evolutionary advantage of the pigmented NAC has a direct physiological function, namely the initiation of involution at the end of the infant lactation period...
January 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28336898/2d-transition-metal-dichalcogenides-and-graphene-based-ternary-composites-for-photocatalytic-hydrogen-evolution-and-pollutants-degradation
#11
REVIEW
Ying Chen, Hongqi Sun, Wenchao Peng
Photocatalysis have attracted great attention due to their useful applications for sustainable hydrogen evolution and pollutants degradation. Transition metal dichalcogenides (TMDs) such as MoS₂ and WS₂ have exhibited great potential as cocatalysts to increase the photo-activity of some semiconductors. By combination with graphene (GR), enhanced cocatalysts of TMD/GR hybrids could be synthesized. GR here can act as a conductive electron channel for the transport of the photogenerated electrons, while the TMDs nanosheets in the hybrids can collect electrons and act as active sites for photocatalytic reactions...
March 15, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336856/a-novel-heterostructure-of-bioi-nanosheets-anchored-onto-mwcnts-with-excellent-visible-light-photocatalytic-activity
#12
Shijie Li, Shiwei Hu, Kaibing Xu, Wei Jiang, Jianshe Liu, Zhaohui Wang
Developing efficient visible-light-driven (VLD) photocatalysts for environmental decontamination has drawn significant attention in recent years. Herein, we have reported a novel heterostructure of multiwalled carbon nanotubes (MWCNTs) coated with BiOI nanosheets as an efficient VLD photocatalyst, which was prepared via a simple solvothermal method. The morphology and structure were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS), and specific surface area measurements...
January 23, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336854/enhanced-visible-light-photocatalytic-activity-of-zno-nanowires-doped-with-mn-2-and-co-2-ions
#13
Wei Li, Guojing Wang, Chienhua Chen, Jiecui Liao, Zhengcao Li
In this research, ZnO nanowires doped with Mn(2+) and Co(2+) ions were synthesized through a facile and inexpensive hydrothermal approach, in which Mn(2+) and Co(2+) ions successfully substituted Zn(2+) in the ZnO crystal lattice without changing the morphology and crystalline structure of ZnO. The atomic percentages of Mn and Co were 6.29% and 1.68%, respectively, in the doped ZnO nanowires. The photocatalytic results showed that Mn-doped and Co-doped ZnO nanowires both exhibited higher photocatalytic activities than undoped ZnO nanowires...
January 19, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336851/nano-photonic-structures-for-light-trapping-in-ultra-thin-crystalline-silicon-solar-cells
#14
Prathap Pathi, Akshit Peer, Rana Biswas
Thick wafer-silicon is the dominant solar cell technology. It is of great interest to develop ultra-thin solar cells that can reduce materials usage, but still achieve acceptable performance and high solar absorption. Accordingly, we developed a highly absorbing ultra-thin crystalline Si based solar cell architecture using periodically patterned front and rear dielectric nanocone arrays which provide enhanced light trapping. The rear nanocones are embedded in a silver back reflector. In contrast to previous approaches, we utilize dielectric photonic crystals with a completely flat silicon absorber layer, providing expected high electronic quality and low carrier recombination...
January 13, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336841/bulk-surfaces-coated-with-triangular-silver-nanoplates-antibacterial-action-based-on-silver-release-and-photo-thermal-effect
#15
Agnese D'Agostino, Angelo Taglietti, Roberto Desando, Marcella Bini, Maddalena Patrini, Giacomo Dacarro, Lucia Cucca, Piersandro Pallavicini, Pietro Grisoli
A layer of silver nanoplates, specifically synthesized with the desired localized surface plasmon resonance (LSPR) features, was grafted on amino-functionalized bulk glass surfaces to impart a double antibacterial action: (i) the well-known, long-term antibacterial effect based on the release of Ag⁺; (ii) an "on demand" action which can be switched on by the use of photo-thermal properties of silver nano-objects. Irradiation of these samples with a laser having a wavelength falling into the so called "therapeutic window" of the near infrared region allows the reinforcement, in the timescale of minutes, of the classical antibacterial effect of silver nanoparticles...
January 6, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336448/permanent-implants-for-lip-augmentation-results-from-a-retrospective-study-and-presentation-of-tips-and-tricks
#16
S Guida, V D Mandel, F Farnetani, C M Manola, G Rubino, S Ruzzu, G Pellacani, C Longo, G G Urtis
BACKGROUND: Requests for lip augmentation are increasing because of expanding media exposure and consumer needs. Temporary effects can be obtained by several techniques, but a recent procedure consisting of lip prosthesis implantation, offering a permanent result, is emerging. Accordingly, the implantation of solid lip prosthesis represents an innovation in the field of esthetic medicine and surgery. METHODS: A total of 100 women with atrophic or hypoplastic lips were treated with lip implants...
February 27, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28336424/the-impact-of-oxidative-stress-and-inflammation-on-rpe-degeneration-in-non-neovascular-amd
#17
REVIEW
Sayantan Datta, Marisol Cano, Katayoon Ebrahimi, Lei Wang, James T Handa
The retinal pigment epithelium (RPE) is a highly specialized, unique epithelial cell that interacts with photoreceptors on its apical side and with Bruch's membrane and the choriocapillaris on its basal side. Due to vital functions that keep photoreceptors healthy, the RPE is essential for maintaining vision. With aging and the accumulated effects of environmental stresses, the RPE can become dysfunctional and die. This degeneration plays a central role in age-related macular degeneration (AMD) pathobiology, the leading cause of blindness among the elderly in western societies...
March 20, 2017: Progress in Retinal and Eye Research
https://www.readbyqxmd.com/read/28336057/hemorrhage-and-or-microaneurysm-severity-and-count-in-ultrawide-field-images-and-early-treatment-diabetic-retinopathy-study-photography
#18
Paolo S Silva, Hala El-Rami, Rasha Barham, Aditi Gupta, Alan Fleming, Jano van Hemert, Jerry D Cavallerano, Jennifer K Sun, Lloyd Paul Aiello
OBJECTIVE: To evaluate detection of hemorrhage and/or microaneurysm (H/Ma) using ultrawide field (UWF) retinal imaging as compared with standard Early Treatment Diabetic Retinopathy Study (ETDRS) 7-field photographs (ETDRS photos). DESIGN: Single-site comparative study of UWF images and ETDRS photos. PARTICIPANTS: One hundred twenty-six eyes of 69 patients with no diabetic retinopathy (DR) or mild or moderate nonproliferative DR (NPDR). METHODS: Stereoscopic 200° UWF images and stereoscopic 35mm 30° 7-field color photographs were acquired on the same visit...
March 20, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28336003/efficacy-of-a-titanium-dioxide-nanoparticles-based-indoor-anti-odor-product-as-assessed-by-electronic-nose-and-gaschromatography-mass-spectrometry
#19
Mara Mirasoli, Roberto Gotti, Massimo Di Fusco, Giulia Basaglia, Jessica Fiori, Aldo Roda
Indoor air pollutants and odorants may have psychological and physical impact on exposed individuals and the unpleasant room air is considered as one of the factors associated with sick building syndrome comprising general symptoms such as headache and lethargy. Approaches for improving the quality of indoor air are thus important as support for human health and well-being. Photo-oxidation catalyzed by titanium dioxide (TiO2), is one of the methods used for elimination of volatile organic compounds, which are the cause of odor nuisance in indoor and outdoor air...
March 9, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28335967/an-innovative-monolithic-zwitterionic-stationary-phase-for-the-separation-of-phenolic-acids-in-coffee-bean-extracts-by-capillary-electrochromatography
#20
Adele Murauer, Rania Bakry, Herwig Schottenberger, Christian Huck, Markus Ganzera
A methacrylate based monolith, containing the innovative zwitterionic monomer (3-allyl-1-imidazol)propane sulfonate, was prepared in 100 μm I.D. silica capillaries by UV initiated photo-polymerization. Composition of the porogen, i.e. a mixture of 1-propanol, 1,4 butanediol and water, was of great importance to obtain a homogeneous monolith with satisfactory permeability and good electrochromatographic performance. Morphology of the stationary phase was studied in Scanning Electron Microscopy and IR experiments, which revealed a good attachment to the capillary wall, flowthrough-pores in the range of 0...
April 22, 2017: Analytica Chimica Acta
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