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https://www.readbyqxmd.com/read/29160771/synthesis-of-oxide-free-aluminum-nanoparticles-for-application-to-conductive-film
#1
Yung Jong Lee, Changsoo Lee, Hyuck Mo Lee
Aluminum nanoparticles are considered promising as alternatives to conventional ink materials, replacing silver and copper nanoparticles due to their extremely low cost and low melting temperature. However, a serious obstacle to realizing their use as conductive ink materials is the oxidation of aluminum. In this research, we synthesized the oxide-free aluminum nanoparticles using catalytic decomposition and an oleic acid coating method, and these materials were applied to the conductive ink for the first time...
November 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29158200/effects-of-diesel-exhaust-derived-secondary-organic-aerosol-soa-on-oocytes-potential-risks-to-meiotic-maturation
#2
Osamu Udagawa, Akiko Furuyama, Koji Imai, Yuji Fujitani, Seishiro Hirano
Particulate air pollution (PM 2.5) is a worldwide concern. Growing epidemiological evidence has shown pathophysiological effects of PM 2.5,not only on cardiovascular system but also on reproductive performance. The composition and physicochemical properties of PM 2.5 vary depending on the emission sources, climate conditions, and complex chemical reactions in the air. These factors make it difficult to understand the cause and mechanistic details of the adverse health effects of PM 2.5. Here, we show potential impacts of PM 2...
November 17, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/29150508/community-composition-and-ultrastructure-of-a-nitrate-dependent-anaerobic-methane-oxidizing-enrichment-culture
#3
Lavinia Gambelli, Simon Guerrero-Cruz, Rob J Mesman, Geert Cremers, Mike S M Jetten, Huub J M Op den Camp, Boran Kartal, Claudia Lueke, Laura van Niftrik
Methane is a very potent greenhouse gas and can be oxidized aerobically or anaerobically through microbial-mediated processes, thus decreasing methane emissions to the atmosphere. Using a complementary array of methods including phylogenetic analysis, physiological experiments, and light and electron microscopy techniques (including electron tomography), we investigated the community composition and ultrastructure of a continuous bioreactor enrichment culture, in which anaerobic methane oxidation (AOM) was coupled to nitrate reduction...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29149554/boron-dissolved-and-dust-atmospheric-inputs-to-a-forest-ecosystem-northeastern-france
#4
Philippe Roux, Marie Pierre Turpault, Gil Kirchen, Paul-Olivier Redon, Damien Lemarchand
Boron concentrations and isotopic compositions of atmospheric dust and dissolved depositions were monitored over a two-years period (2012-2013) in the forest ecosystem of Montiers (Northeastern France). This time series allows the determination of the boron atmospheric inputs to this forest ecosystem and contributes to refine our understanding of the sources and processes that control the boron atmospheric cycle. Mean annual dust and dissolved boron atmospheric depositions are comparable in size (13 g.ha-1...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29145948/type-of-atrial-fibrillation-and-outcomes-in%C3%A2-patients-with-heart-failure-and-reduced%C3%A2-ejection%C3%A2-fraction
#5
Ulrik M Mogensen, Pardeep S Jhund, William T Abraham, Akshay S Desai, Kenneth Dickstein, Milton Packer, Jean L Rouleau, Scott D Solomon, Karl Swedberg, Michael R Zile, Lars Køber, John J V McMurray
BACKGROUND: Atrial fibrillation (AF) is common in heart failure (HF), but the outcome by type of AF is largely unknown. OBJECTIVES: This study investigated outcomes related to type of AF (paroxysmal, persistent or permanent, or new onset) in 2 recent large trials in patients with HF with reduced ejection fraction. METHODS: The study analyzed patients in the PARADIGM-HF (Prospective comparison of ARNI with ACEI to Determine Impact on Global Mortality and morbidity in Heart Failure) and ATMOSPHERE (Aliskiren Trial to Minimize Outcomes in Patients with Heart Failure) trials...
November 14, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29144288/gas-composition-of-sludge-residue-profiles-in-a-sludge-treatment-reed-bed-between-loadings
#6
Julie D Larsen, Steen M Nielsen, Charlotte Scheutz
Treatment of sludge in sludge treatment reed bed systems includes dewatering and mineralization. The mineralization process, which is driven by microorganisms, produces different gas species as by-products. The pore space composition of the gas species provides useful information on the biological processes occurring in the sludge residue. In this study, we measured the change in composition of gas species in the pore space at different depth levels in vertical sludge residue profiles during a resting period of 32 days...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29141857/contemporary-characteristics-and-outcomes-in-chagasic-heart-failure-compared-with-other-nonischemic-and-ischemic-cardiomyopathy
#7
Li Shen, Felix Ramires, Felipe Martinez, Luiz Carlos Bodanese, Luis Eduardo Echeverría, Efraín A Gómez, William T Abraham, Kenneth Dickstein, Lars Køber, Milton Packer, Jean L Rouleau, Scott D Solomon, Karl Swedberg, Michael R Zile, Pardeep S Jhund, Claudio R Gimpelewicz, John J V McMurray
BACKGROUND: Chagas' disease is an important cause of cardiomyopathy in Latin America. We aimed to compare clinical characteristics and outcomes in patients with heart failure (HF) with reduced ejection fraction caused by Chagas' disease, with other etiologies, in the era of modern HF therapies. METHODS AND RESULTS: This study included 2552 Latin American patients randomized in the PARADIGM-HF (Prospective Comparison of ARNI With ACEI to Determine Impact on Global Mortality and Morbidity in Heart Failure) and ATMOSPHERE (Aliskiren Trial to Minimize Outcomes in Patients With Heart Failure) trials...
November 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/29139499/the-role-of-phase-separation-and-related-topography-in-the-exceptional-ice-nucleating-ability-of-alkali-feldspars
#8
Thomas F Whale, Mark A Holden, Alexander N Kulak, Yi-Yeoun Kim, Fiona C Meldrum, Hugo K Christenson, Benjamin J Murray
Our understanding of crystal nucleation is a limiting factor in many fields, not least in the atmospheric sciences. It was recently found that feldspar, a component of airborne desert dust, plays a dominant role in triggering ice formation in clouds, but the origin of this effect was unclear. By investigating the structure/property relationships of a wide range of feldspars, we demonstrate that alkali feldspars with certain microtextures, related to phase separation into Na and K-rich regions, show exceptional ice-nucleating abilities in supercooled water...
November 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29138765/sizing-sub-diffraction-limit-electrosprayed-droplets-by-structured-illumination-microscopy
#9
Adam Hollerbach, David Logsdon, Kiran Iyer, Anyin Li, J Andy Schaber, R Graham Cooks
Electrosprayed droplets are widely studied for their role in the formation of ions at atmospheric pressure. Most droplet measurement methods used today employ light scattering to infer information about an electrosprayed droplet's size. However, these methods fail to measure droplets smaller than about 400 nm in diameter due to constraints imposed by the diffraction limit of light. To overcome this limitation, a super resolution fluorescence microscopy-based method for determining the sizes of electrosprayed droplets has been developed...
November 15, 2017: Analyst
https://www.readbyqxmd.com/read/29138444/the-elusive-evidence-of-volcanic-lightning
#10
K Genareau, P Gharghabi, J Gafford, M Mazzola
Lightning strikes are known to morphologically alter and chemically reduce geologic formations and deposits, forming fulgurites. A similar process occurs as the result of volcanic lightning discharge, when airborne volcanic ash is transformed into lightning-induced volcanic spherules (LIVS). Here, we adapt the calculations used in previous studies of lightning-induced damage to infrastructure materials to determine the effects on pseudo-ash samples of simplified composition. Using laboratory high-current impulse experiments, this research shows that within the lightning discharge channel there is an ideal melting zone that represents roughly 10% or less of the total channel radius at which temperatures are sufficient to melt the ash, regardless of peak current...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29137773/ultrasonic-assisted-synthesis-of-batio3-nanoparticles-at-25%C3%A2-%C3%A2-c-and-atmospheric-pressure
#11
Songkot Utara, Sitchai Hunpratub
Barium titanate (BaTiO3) nanoparticles were successfully synthesized via a sonochemical method (25 kHz) at a constant temperature of 25 °C and atmospheric pressure without a calcination step. Barium hydroxide Ba(OH)2 and diisopropoxytitanium bis(acetylacetonate) (C12H28O6Ti) were used as the starting materials. The effects of the concentration of NaOH used and ultrasonic reaction time were investigated. The phase composition, functional groups and morphology of synthesized powders were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Fourier transform Raman spectroscopy (FT-Raman) and transmission electron microscopy (TEM)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136570/fabrication-of-g-c3n4-and-a-promising-charcoal-property-towards-enhanced-chromium-vi-reduction-and-wastewater-treatment-under-visible-light
#12
Suphatchaya Lamkhao, Gobwute Rujijanagul, Chamnan Randorn
The visible light driven photoactivity of g-C3N4 can be enhanced using charcoal as a supporter. Charcoal/g-C3N4 composite materials were prepared by the simultaneous thermal condensation of melamine and charcoal. The effect of different atmospheres (O2, air, and argon) on the reaction was investigated. The effect of different weight ratios of charcoal to melamine (1:1 and 1:4 wt%) was also investigated. The physical properties of the charcoal/g-C3N4 materials were analyzed using XRD, SEM, TEM, XPS, BET and FTIR techniques...
November 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/29136569/unleaded-gasoline-as-a-significant-source-of-pb-emissions-in-the-subarctic
#13
Vladislav Chrastný, Hana Šillerová, Martina Vítková, Anna Francová, Jan Jehlička, Jana Kocourková, Paul E Aspholm, Lars O Nilsson, Tore F Berglen, Henning K B Jensen, Michael Komárek
After the phasing out of leaded gasoline, Pb emissions to the atmosphere dramatically decreased, and other sources became more significant. The contribution of unleaded gasoline has not been sufficiently recognized; therefore, we evaluated the impact of Pb from unleaded gasoline in a relatively pristine area in Subarctic NE Norway. The influence of different endmembers (Ni slag and concentrate from the Nikel smelter in Russia, PM10 filters, and traffic) on the overall Pb emissions was determined using various environmental samples (snow, lichens, and topsoils) and Pb isotope tracing...
November 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/29134081/identification-of-the-beagle-2-lander-on-mars
#14
J C Bridges, J Clemmet, M Croon, M R Sims, D Pullan, J-P Muller, Y Tao, S Xiong, A R Putri, T Parker, S M R Turner, J M Pillinger
The 2003 Beagle 2 Mars lander has been identified in Isidis Planitia at 90.43° E, 11.53° N, close to the predicted target of 90.50° E, 11.53° N. Beagle 2 was an exobiology lander designed to look for isotopic and compositional signs of life on Mars, as part of the European Space Agency Mars Express (MEX) mission. The 2004 recalculation of the original landing ellipse from a 3-sigma major axis from 174 km to 57 km, and the acquisition of Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment (HiRISE) imagery at 30 cm per pixel across the target region, led to the initial identification of the lander in 2014...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133450/resurrecting-ancestral-genes-in-bacteria-to-interpret-ancient-biosignatures
#15
Betul Kacar, Lionel Guy, Eric Smith, John Baross
Two datasets, the geologic record and the genetic content of extant organisms, provide complementary insights into the history of how key molecular components have shaped or driven global environmental and macroevolutionary trends. Changes in global physico-chemical modes over time are thought to be a consistent feature of this relationship between Earth and life, as life is thought to have been optimizing protein functions for the entirety of its approximately 3.8 billion years of history on the Earth. Organismal survival depends on how well critical genetic and metabolic components can adapt to their environments, reflecting an ability to optimize efficiently to changing conditions...
December 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29131928/n-and-o-isotope-%C3%AE-15-n-%C3%AE-%C3%AE-15-n-%C3%AE-%C3%AE-18-o-%C3%AE-17-o-analyses-of-dissolved-no3-and-no2-by-the-cd-azide-reduction-method-and-n2-o-laser-spectrometry
#16
Leonard I Wassenaar, Cedric Douence, Mark Altabet, Pradeep Aggarwal
RATIONALE: The nitrogen and oxygen (δ(15) N, δ(18) O, δ(17) O) isotopic compositions of NO3(-) and NO2(-) are important tracers of nutrient dynamics in soil, rain, groundwater and the oceans. The Cd-azide method was used to convert NO3 or NO2 to N2 O for N and triple-O isotopic analyses by N2 O-laser spectrometry. A protocol for laser-based headspace isotope analyses was compared with isotope-ratio mass spectrometry. Lasers provide the ability to directly measure (17) O anomalies which can help discern atmospheric N sources...
November 13, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29131569/efficient-and-lightweight-electromagnetic-wave-absorber-derived-from-metal-organic-frameworks-encapsulated-cobalt-nanoparticles
#17
Haicheng Wang, Long Xiang, Wei Wei, Jing An, Jun He, Chunhong Gong, Yanglong Hou
Magnetic nanoparticles (NPs)/highly porous carbon nanocomposites, derived from metal organic frameworks (MOFs) are of great potential candidates for electromagnetic wave absorbents because of their excellent properties such as strong absorption, low density and good compatibility. In this study, a facile and effective method was developed to synthesize Co magnetic NPs/metal organic frameworks (Co NPs/ZIF-67) nanocomposites. The Co NPs/porous C composites were subsequently obtained by annealing the Co NPs/ZIF-67 nanocomposites at different temperatures under inert atmosphere...
November 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29130790/performance-evaluation-of-a-miniature-magnetic-sector-mass-spectrometer-onboard-a-satellite-in-space
#18
Meiru Guo, Detain Li, Yongjun Cheng, Yongjun Wang, Wenjun Sun, Xiaoqiang Pei, Meng Dong, Xuemin Sheng, Lan Zhao, Yanwu Li
With the rapid development of space technology in China, it is urgent to use mass spectrometer to detect the space environment. In this work, a space miniature magnetic sector mass spectrometer is evaluated, which consists of three subsystems: (1) physical unit, (2) electric control unit, (3) and high voltage power. It has 90° magnetic sector-field analyzer with double trajectory, in which a trajectory measurement range is from 1 to 12 amu, the other range is from 6 to 90 amu.The mass spectrometer has two work models, one is used to measure space neutral gas when the filament of mass spectrometer ion source turned on, the other is used to measure space charged ions when the filament turned off...
January 1, 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29130564/effect-of-non-thermal-atmospheric-plasma-on-the-dentin-surface-topography-and-composition-and-on-the-bond-strength-of-a-universal-adhesive
#19
Ana P Ayres, Jean J Bonvent, Borys Mogilevych, Luis E S Soares, Airton A Martin, Glaucia M Ambrosano, Fábio D Nascimento, Bart Van Meerbeek, Marcelo Giannini
This study investigated the effect of application of non-thermal atmospheric plasma (NTAP) on the topography and composition of the dentin surface, as well as the microtensile bond strength (μTBS) of a universal adhesive to NTAP-treated dentin. Exposed flat dentin surfaces from human third molars were either treated with NTAP for 10 and 30 s or untreated (control). The dentin-surface topography and chemical composition were characterized by atomic force microscopy (n = 3) and Raman confocal spectroscopy (n = 5), respectively...
November 11, 2017: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/29126095/characterizing-isotopic-compositions-of-tc-c-no3-n-and-nh4-n-in-pm2-5-in-south-korea-impact-of-china-s-winter-heating
#20
Yu-Mi Park, Kwang-Su Park, Hyuk Kim, Seok-Min Yu, Seam Noh, Min-Seob Kim, Jee-Young Kim, Joon-Young Ahn, Min-do Lee, Kwang-Seol Seok, Young-Hee Kim
The origin of PM2.5 has long been the subject of debate and stable isotopic tools have been applied to decipher. In this study, weekly PM2.5 samples were simultaneously collected at an urban (Seoul) and rural (Baengnyeong Island) site in Korea from January 2014 through February 2016. The seasonal variation of isotopic species showed significant seasonal differences with sinusoidal variation. The isotopic results implied that isotope species from Baengnyeong were mostly originated from coal combustion during China's winter heating seasons, whereas in summer, the isotopic patterns observed that were more likely to be from marine...
November 7, 2017: Environmental Pollution
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