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https://www.readbyqxmd.com/read/28221936/evaluation-of-a-recirculating-dipper-well-combined-with-ozone-sanitizer-for-control-of-foodborne-pathogens-in-food-service-operations
#1
Giselle Almeida, Kristen E Gibson
In the retail food service industry, small countertop sinks, or dipper wells, are utilized to rinse and store serving utensils between uses. These dipper wells are designed to operate under a constant flow of water, which serves both to prevent the accumulation of microorganisms and to aid in the cleanliness of the dipper well itself. Here, a recirculating dipper well ozone sanitation system (DWOSS) was evaluated for the control and inactivation of Escherichia coli , Listeria innocua , PRD1 bacteriophage, and Staphylococcus aureus present on a stainless steel disher...
September 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28220997/highly-stable-sr-free-cobaltite-based-perovskite-cathodes-directly-assembled-on-a-barrier-layer-free-y2-o3-zro2-electrolyte-of-solid-oxide-fuel-cells
#2
Na Ai, Na Li, William D A Rickard, Yi Cheng, Kongfa Chen, San Ping Jiang
Direct assembly is a newly developed technique in which a cobaltite-based perovskite (CBP) cathode can be directly applied to a barrier-layer-free Y2 O3 -ZrO2 (YSZ) electrolyte with no high-temperature pre-sintering steps. Solid oxide fuel cells (SOFCs) based on directly assembled CBPs such as La0.6 Sr0.4 Co0.2 Fe0.8 O3-δ show high performance initially but degrade rapidly under SOFC operation conditions at 750 °C owing to Sr segregation and accumulation at the electrode/electrolyte interface. Herein, the performance and interface of Sr-free CBPs such as LaCoO3-δ (LC) and Sm0...
February 21, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28220996/surviving-high-temperature-calcination-zro2-induced-hematite-nanotubes-for-photoelectrochemical-water-oxidation
#3
Chengcheng Li, Ang Li, Zhibin Luo, Jijie Zhang, Xiaoxia Chang, Zhiqi Huang, Tuo Wang, Jinlong Gong
Nanotubular Fe2 O3 is a promising photoanode material, and producing morphologies that withstand high-temperature calcination (HTC) is urgently needed to enhance the photoelectrochemical (PEC) performance. This work describes the design and fabrication of Fe2 O3 nanotube arrays that survive HTC for the first time. By introducing a ZrO2 shell on hydrothermal FeOOH nanorods by atomic layer deposition, subsequent high-temperature solid-state reaction converts FeOOH-ZrO2 nanorods to ZrO2 -induced Fe2 O3 nanotubes (Zr-Fe2 O3 NTs)...
February 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28220348/proteasome-inhibitor-mg132-induces-thyroid-cancer-cell-apoptosis-by-modulating-the-activity-of-transcription-factor-foxo3a
#4
Wei Qiang, Fang Sui, Jingjing Ma, Xinru Li, Xiaojuan Ren, Yuan Shao, Jiazhe Liu, Haixia Guan, Bingyin Shi, Peng Hou
Proteasome inhibitors are promising antitumor drugs with preferable cytotoxicity in malignant cells and have exhibited clinical efficiency in several hematologic malignancies. P53-dependent apoptosis has been reported to be a major mechanism underlying. However, apoptosis can also be found in cancer cells with mutant-type p53, suggesting the involvement of p53-independent mechanism. Tumor suppressor forkhead Box O3 is another substrate of proteasomal degradation, which also functions partially through inducing apoptosis...
February 20, 2017: Endocrine
https://www.readbyqxmd.com/read/28219424/health-risk-assessment-of-china-s-main-air-pollutants
#5
Jian Sun, Tiancai Zhou
BACKGROUND: With the rapid development of China's economy, air pollution has attracted public concern because of its harmful effects on health. METHODS: The source apportioning of air pollution, the spatial distribution characteristics, and the relationship between atmospheric contamination, and the risk of exposure were explored. The in situ daily concentrations of the principal air pollutants (PM2.5, PM10, SO2, NO2, CO and O3) were obtained from 188 main cities with many continuous air-monitoring stations across China (2014 and 2015)...
February 20, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28218820/eliminating-overerase-behavior-by-designing-energy-band-in-high-speed-charge-trap-memory-based-on-wse2
#6
Chunsen Liu, Xiao Yan, Jianlu Wang, Shijin Ding, Peng Zhou, David Wei Zhang
Atomic crystal charge trap memory, as a new concept of nonvolatile memory, possesses an atomic level flatness interface, which makes them promising candidates for replacing conventional FLASH memory in the future. Here, a 2D material WSe2 and a 3D Al2 O3 /HfO2 /Al2 O3 charge-trap stack are combined to form a charge-trap memory device with a separation of control gate and memory stack. In this device, the charges are erased/written by built-in electric field, which significantly enhances the write speed to 1 µs...
February 20, 2017: Small
https://www.readbyqxmd.com/read/28212639/erectile-dysfunction-and-exposure-to-ambient-air-pollution-in-a-nationally-representative-cohort-of-older-men
#7
Lindsay A Tallon, Justin Manjourides, Vivian C Pun, Murray A Mittleman, Marianthi-Anna Kioumourtzoglou, Brent Coull, Helen Suh
BACKGROUND: Little is known about the association between air pollution and erectile dysfunction (ED), a disorder occurring in 64% of men over the age of 70, and to date, no studies have been published. To address this significant knowledge gap, we explored the relationship between ED and air pollution in a group of older men who were part of the National Social Life, Health, and Aging Project (NSHAP), a nationally representative cohort study of older Americans. METHODS: We obtained incident ED status and participant data for 412 men (age 57-85)...
February 17, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28212018/derivation-of-hydroperoxyl-radical-ho2-levels-at-an-urban-site-via-measurement-of-pernitric-acid-ho2no2-by-iodide-chemical-ionization-mass-spectrometry-i-cims
#8
Dexian Chen, L Gregory Huey, David J Tanner, Jianfeng Li, Nga Lee Ng, Yuhang Wang
Hydroperoxyl radical (HO2) is a key species to atmospheric chemistry. At warm temperatures, the hydroperoxyl radical (HO2) and NO2 come to a rapid steady state with pernitric acid (HO2NO2). This paper presents the derivation of HO2 from observations of HO2NO2 and NO2 in metropolitan Atlanta, US in winter 2014 and summer 2015. HO2 was observed to have a diurnal cycle with morning concentrations suppressed by high NO from the traffic. At night, derived HO2 levels were nonzero and exhibited correlations with O3 and NO3, consistent with previous studies that ozonolysis and oxidation by NO3 are sources of nighttime HO2...
February 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28208075/socioeconomic-and-air-pollution-correlates-of-adult-asthma-heart-attack-and-stroke-risks-in-the-united-states-2010-2013
#9
Louis Anthony Tony Cox
Asthma in the United States has become an important public health issue, with many physicians, regulators, and scientists elsewhere expressing concern that criterion air pollutants have contributed to a rising tide of asthma cases and symptoms. This paper studies recent associations (from 2008 to 2012) between self-reported asthma experiences and potential predictors, including age, sex, income, education, smoking, and county-level average annual ambient concentrations of ozone (O3) and fine particulate matter (PM2...
February 13, 2017: Environmental Research
https://www.readbyqxmd.com/read/28207241/zero-thermal-expansion-and-semiconducting-properties-in-pbtio3-bi-co-ti-o3-ferroelectric-solid-solutions
#10
Zhao Pan, Jun Chen, Xingxing Jiang, Zheshuai Lin, Linxing Zhang, Longlong Fan, Yangchun Rong, Lei Hu, Hui Liu, Yang Ren, Xiaojun Kuang, Xianran Xing
Zero thermal expansion (ZTE) behavior is rare but important for both fundamental studies and practical applications of functional materials. Until now, most available ZTE materials are either electrical insulating oxides or conductive metallic compounds. Very few ZTE materials exhibit the semiconductor feature. Here we report a ZTE in a semiconducting ferroelectric of 0.6PbTiO3-0.4Bi(Co0.55Ti0.45)O3-δ. Its unit cell volume exhibits a negligible change over a broad temperature range from room temperature to 500 °C...
February 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28202267/large-eddy-simulation-of-reactive-pollutants-in-a-deep-urban-street-canyon-coupling-dynamics-with-o3-nox-voc-chemistry
#11
Jian Zhong, Xiao-Ming Cai, William James Bloss
A large eddy simulation (LES) model coupled with O3-NOx-VOC chemistry is implemented to simulate the coupled effects of emissions, mixing and chemical pre-processing within an idealised deep (aspect ratio = 2) urban street canyon under a weak wind condition. Reactive pollutants exhibit significant spatial variations in the presence of two vertically aligned unsteady vortices formed in the canyon. Comparison of the LES results from two chemical schemes (simple NOx-O3 chemistry and a more comprehensive Reduced Chemical Scheme (RCS) chemical mechanism) shows that the concentrations of NO2 and Ox inside the street canyon are enhanced by approximately 30-40% via OH/HO2 chemistry...
February 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28202226/air-pollution-pm2-5-composition-source-factors-and-respiratory-symptoms-in-asthmatic-and-nonasthmatic-children-in-santiago-chile
#12
Laura Prieto-Parra, Karla Yohannessen, Cecilia Brea, Daniella Vidal, Carlos A Ubilla, Pablo Ruiz-Rudolph
The objective of this study was to determine the association of respiratory symptoms and medication use and exposure to various air pollutants, PM2.5 components, and source factors in a panel of asthmatic and nonasthmatic children in Santiago, Chile. To this end, 174 children (90 asthmatics and 84 nonasthmatics) were followed throughout the winter months of 2010 and 2011. During the study period, children filled out daily diaries to record respiratory symptoms and medication use. Air pollution data were obtained from government central site measurements and a PM2...
February 12, 2017: Environment International
https://www.readbyqxmd.com/read/28201905/accurate-ab-initio-dipole-moment-surfaces-of-ozone-first-principle-intensity-predictions-for-rotationally-resolved-spectra-in-a-large-range-of-overtone-and-combination-bands
#13
Vladimir G Tyuterev, Roman V Kochanov, Sergey A Tashkun
Ab initio dipole moment surfaces (DMSs) of the ozone molecule are computed using the MRCI-SD method with AVQZ, AV5Z, and VQZ-F12 basis sets on a dense grid of about 1950 geometrical configurations. The analytical DMS representation used for the fit of ab initio points provides better behavior for large nuclear displacements than that of previous studies. Various DMS models were derived and tested. Vibration-rotation line intensities of (16)O3 were calculated from these ab initio surfaces by the variational method using two different potential functions determined in our previous works...
February 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28198909/luminescent-ybvo4-by-atomic-layer-deposition
#14
Michael Getz, Per-Anders Hansen, Mohammed A K Ahmed, Helmer Fjellvåg, Ola Nilsen
UV to visible and near-infrared converting thin films of YbVO4 have been deposited by atomic layer deposition, using the precursor combinations Yb(thd)3 (thd = 2,2,6,6-tetramethyl-3,5-heptanedione) and O3, and VO(thd)2 and O3 at a deposition temperature of 240 °C, followed by post deposition annealing at 400-1000 °C. The UV absorption and the visible and near-infrared emission have been investigated in detail. The structure, thickness and composition of the deposited films have been studied by X-ray diffraction, ellipsometry, and X-ray fluorescence, respectively...
February 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28195498/quantitative-imaging-of-ozone-vapor-using-photofragmentation-laser-induced-fluorescence-lif
#15
Kajsa Larsson, Dina Hot, Andreas Ehn, Andreas Lantz, Wubin Weng, Marcus Aldén, Joakim Bood
In the present work, the spectral properties of gaseous ozone (O3) have been investigated aiming to perform quantitative concentration imaging of ozone by using a single laser pulse at 248 nm from a KrF excimer laser. The O3 molecule is first photodissociated by the laser pulse into two fragments, O and O2. Then the same laser pulse electronically excites the O2 fragment, which is vibrationally hot, whereupon fluorescence is emitted. The fluorescence intensity is found to be proportional to the concentration of ozone...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28195367/designing-strained-interface-heterostructures-for-memristive-devices
#16
Sebastian Schweiger, Reto Pfenninger, William J Bowman, Ulrich Aschauer, Jennifer L M Rupp
Ionic heterostructures are used as a strain-modulated memristive device based on the model system Gd0.1 Ce0.9 O2-δ /Er2 O3 to set and tune the property of "memristance." The modulation of interfacial strain and the interface count is used to engineer the Roff /Ron ratio and the persistence of the system. A model describing the variation of mixed ionic-electronic mobilities and defect concentrations is presented.
February 13, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28193424/a-hyperbranched-%C3%AE-d-glucan-with-compact-coil-conformation-from-lignosus-rhinocerotis-sclerotia
#17
Ting Hu, Qilin Huang, Kahing Wong, Hong Yang, Jingsi Gan, Yanru Li
An alkali-soluble polysaccharide was extracted from Lignosus rhinocerotis sclerotia (LRP). Its structural characteristics were determined by GC-MS, FT-IR, GC, 1D and 2D NMR combined with Smith degradation and methylation analysis. The LRP had a (1→3)-β-d-Glcp backbone with every three residues bearing a (1→6)-linked and hyperbranched side chain that contained three (1→6)-β-d-Glcp residues as secondary main chain and two terminal β-d-Glcp residues linked at O3. The degree of branching was 0.76 from GC-MS analysis, implying a highly branched structure for LRP...
June 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28192946/gold-nanoprobe-enabled-three-dimensional-ozone-imaging-by-optical-coherence-tomography
#18
Xueqin Jiang, Peijun Tang, Panpan Gao, Yu Shrike Zhang, Changqing Yi, Jianhua Zhou
Ozone (O3) would be harmful to human skin for its strong oxidizing property, especially when stratum corneum or corneal epithelium is wounded. Imaging the penetration and distribution of ozone at depth is beneficial for studying the influence of ozone on skin or eyes. Here, we introduced a facile method for three-dimensional (3D) imaging of the penetration of O3 into the anterior chamber of an isolated crucian carp eye by using optical coherence tomography (OCT) combined with gold triangular nanoprisms (GTNPs) as the contrast agent and molecular probe...
February 2, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28191940/thorium-chemistry-in-oxo-tellurium-system-under-extreme-conditions
#19
Bin Xiao, Philip Kegler, Dirk Bosbach, Evgeny V Alekseev
Through the use of a high-temperature/high-pressure synthesis method, four thorium oxo-tellurium compounds with different tellurium valence states were isolated. The novel inorganic phases illustrate the intrinsic complexity of the actinide tellurium chemistry under extreme conditions of pressure and temperature. Th2Te3O11 is the first instance of a mixed-valent oxo-tellurium compound, and at the same time, Te exhibits three different coordination environments (Te(IV)O3, Te(IV)O4, and Te(VI)O6) within a single structure...
February 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28187330/experimental-effect-of-ozone-upon-the-microbial-flora-of-commercially-produced-dairy-fermented-products
#20
A Alexopoulos, S Plessas, Y Kourkoutas, C Stefanis, S Vavias, C Voidarou, I Mantzourani, E Bezirtzoglou
Ozone was used to control spoilage microorganisms during the manufacturing of dairy products. Ozone stream was applied onto the surface of freshly filled yoghurt cups just before storage for curd development in order to prevent cross contamination from spoilage airborne microorganisms. Accordingly, brine solution was bubbled with ozone for various periods of time and used for ripening of white (feta type) cheese. Both products were subjected to a continuous monitoring of microbial load and also tested for their sensorial properties...
January 27, 2017: International Journal of Food Microbiology
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