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https://www.readbyqxmd.com/read/28813509/associations-of-particulate-matter-and-its-components-with-emergency-room-visits-for-cardiovascular-and-respiratory-diseases
#1
Sung-Hee Hwang, Jae Young Lee, Seung-Muk Yi, Ho Kim
Numerous studies have revealed an association between particulate matter (PM) and emergency room (ER) visits, although few studies have investigated the association between health and PM components. The present study evaluated the associations of ER visits for cardiovascular and respiratory diseases with PM2.5 components, including organic carbon (OC), elemental carbon (EC), and ion species (SO42-, NO3-, and NH4+). Statistical analyses were performed using the time-series approach, and generalized linear models with natural spline functions were used to adjust for the non-linear relationship between the confounders and ER visits...
2017: PloS One
https://www.readbyqxmd.com/read/28812866/directly-coating-multifunctional-interlayer-on-the-cathode-via-electrospinning-for-advanced-lithium-sulfur-batteries
#2
Yueying Peng, Yiyong Zhang, Yunhui Wang, Xiu Shen, Feng Wang, He Li, Bing-Joe Hwang, Jinbao Zhao
Lithium sulfur battery is considered as a prospective candidate for high-energy-storage system as its high theoretical specific capacity and energy. However, the dissolution and shutter of polysulfides lead to low active material utilization and fast capacity fading. Electrospinning technology is employed to directly coat an interlayer composed of polyacrylonitrile (PAN) and nitrogen-doped carbon black (NC) fibers on the cathode. Benefited from electrospinning technology, the PAN-NC fibers possess good electrolyte infiltration for fast lithium-ion transport and great flexibility for adhering on the cathode...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812086/different-natures-of-surface-electronic-transitions-of-carbon-nanoparticles
#3
A Sciortino, A Cayuela, M L Soriano, F M Gelardi, M Cannas, M Valcárcel, F Messina
The photoluminescence behaviour of carbon-based nanodots is still debated. Both core and surface structures are involved in the emission mechanism, and the electronic transitions can be modified by external agents such as metal ions or pH, but the general relation between the structure and the optical function is poorly understood. Here, we report a comparative study on the effects of these variables, changing the core structure from crystalline to amorphous, and modifying the surface structure by different passivation procedures...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28811720/endoscopic-occlusion-with-silicone-spigots-for-the-closure-of-refractory-esophago-bronchiole-fistula-after-esophagectomy
#4
Masaya Uesato, Tsuguaki Kono, Yasunori Akutsu, Kentarou Murakami, Akiko Kagaya, Yorihiko Muto, Akira Nakano, Mizuho Aikawa, Tomohide Tamachi, Hiroyuki Amagai, Takahiro Arasawa, Yasuhide Muto, Hisahiro Matsubara
A 65-year-old man with cT1bN0M0 stage I middle thoracic esophageal cancer underwent subtotal esophagectomy and gastric tube reconstruction through the posterior mediastinal route after preoperative carbon-ion radiotherapy and chemotherapy in a clinical trial. Anastomotic leakage occurred, but it spontaneously improved. At six months after the operation, he was rehospitalized with a cough and dysphagia. An esophago-bronchiole fistula and stenosis of the gastric tube were observed. He first underwent stent placement in the gastric tube...
July 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28810881/comparison-of-photon-volumetric-modulated-arc-therapy-intensity-modulated-proton-therapy-and-intensity-modulated-carbon-ion-therapy-for-delivery-of-hypo-fractionated-thoracic-radiotherapy
#5
Alexander Chi, Lien-Chun Lin, Sijin Wen, Haijuan Yan, Wen-Chien Hsi
PURPOSE: The aim of the present study was to compare the dose distribution generated from photon volumetric modulated arc therapy (VMAT), intensity modulated proton therapy (IMPT), and intensity modulated carbon ion therapy (IMCIT) in the delivery of hypo-fractionated thoracic radiotherapy. METHODS AND MATERIALS: Ten selected patients who underwent thoracic particle therapy between 2015 and 2016 were re-planned to receive a relative biological effectiveness (RBE) weighted dose of 60 Gy (i...
August 15, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28810759/lanthanum-mediated-dehydrogenation-of-1-and-2-butynes-spectroscopy-and-formation-of-la-c4h4-isomers
#6
Wenjin Cao, Dilrukshi Hewage, Dong-Sheng Yang
La atom reactions with 1-butyne and 2-butyne are carried out in a laser-vaporization molecular beam source. Both reactions yield the same La-hydrocarbon products from the dehydrogenation and carbon-carbon bond cleavage and coupling of the butynes. The dehydrogenated species La(C4H4) is characterized with mass-analyzed threshold ionization (MATI) spectroscopy and quantum chemical computations. The MATI spectra of La(C4H4) produced from the two reactions exhibit two identical transitions, each consisting of a strong origin band and several vibrational intervals...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28810617/multicomponent-quantification-of-astragalus-residue-fermentation-liquor-using-ion-chromatography-integrated-pulsed-amperometric-detection
#7
Ying Zhang, Jiarong Wu, Quanhui Ni, Hong Dong
Chinese medicine residues contain abundant cellulose and hemicellulose, which are potential renewable carbon sources for ethanol production. The aim of the present study was to develop a rapid and reliable method to evaluate the cellulose and hemicellulose utilization in Chinese medicine residues. In the present study, key hydrolysates (arabinose, galactose, glucose, xylose, and cellobiose) of the cellulose and hemicellulose in fermentation liquor of Astragalus residues were simultaneously quantified by ion chromatography using an integrated pulsed amperometric detector (IPAD)...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28810205/chemical-composition-source-and-process-of-urban-aerosols-during-winter-haze-formation-in-northeast-china
#8
Jian Zhang, Lei Liu, Yuanyuan Wang, Yong Ren, Xin Wang, Zongbo Shi, Daizhou Zhang, Huizheng Che, Hujia Zhao, Yanfei Liu, Hongya Niu, Jianmin Chen, Xiaoye Zhang, A P Lingaswamy, Zifa Wang, Weijun Li
The characteristics of aerosol particles have been poorly evaluated even though haze episodes frequently occur in winter in Northeast China. OC/EC analysis, ion chromatography, and transmission electron microscopy (TEM) were used to investigate the organic carbon (OC) and elemental carbon (EC), and soluble ions in PM2.5 and the mixing state of individual particles during a severe wintertime haze episode in Northeast China. The organic matter (OM), NH4(+), SO4(2-), and NO3(-) concentrations in PM2.5 were 89...
August 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28809566/carbon-phosphorous-bond-formation-on-anilines-mediated-by-a-hypervalent-iodine-reagent
#9
Elsa Deruer, Siomenan Coulibali, Saad Boukercha, Sylvain Canesi
Substituted anilines containing a sulfonyl group may be oxidized in situ in the presence of methanol and a hypervalent iodine reagent to form an active iminium species. Subsequent addition of phosphines or phosphites in the same pot produces meta-substituted anilines in good yields. This formal C-H bond functionalization is a direct and efficient means of selectively substituting the meta-position of anilines to produce aromatic phosphonium ions or phosphonates.
August 15, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28809558/aliphatic-c-sp3-h-bond-activation-using-nickel-catalysis-mechanistic-insights-on-regioselective-arylation
#10
Sukriti Singh, Surya K, Raghavan B Sunoj
Transition metal catalyzed C(sp3)-H bond activation in aliphatic compounds are of current interest. Lack of mechanistic insights on Ni-catalyzed C(sp3)-H activation using 8-aminoquinoline as a directing group motivated us to examine an interesting direct arylation of an aliphatic tertiary amide by using density functional theory. The catalysis employed Ni(II) pre-catalyst, 4-iodoanisole as an arylating agent, sodium carbonate and mesitylenic acid as additives in DMF solvent. Examination of a comprehensive set of mechanistic pathways helped us learn that the most preferred route begins with a bidentate chelate binding of deprotonated substrate to the Ni...
August 15, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28809537/confined-water-structure-dynamics-and-thermodynamics
#11
Sudip Chakraborty, Hemant Kumar, Chandan Dasgupta, Prabal K Maiti
Understanding the properties of strongly confined water is important for a variety of applications such as fast flow and desalination devices, voltage generation, flow sensing, and nanofluidics. Confined water also plays an important role in many biological processes such as flow through ion channels. Water in the bulk exhibits many unusual properties that arise primarily from the presence of a network of hydrogen bonds. Strong confinement in structures such as carbon nanotubes (CNTs) substantially modifies the structural, thermodynamic, and dynamic (both translational and orientational) properties of water by changing the structure of the hydrogen bond network...
August 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28809478/ruthenium-ii-and-ruthenium-iii-complexes-of-p-benziporphyrin-merging-equatorial-and-axial-organometallic-coordination
#12
Aneta Idec, Miłosz Pawlicki, Lechosław Latos-Grażyński
A diamagnetic ruthenium(II) complex of 5,10,15,20-tetraphenyl-p-benziporphyrin [Ru(II)(p-BzP)(CO)Cl] was obtained via the insertion of ruthenium into p-benziporphyrin using triruthenium(0) dodecacarbonyl [Ru3(CO)12] as the metal source. The procedure applying dichloro(cycloocta-1,5-diene)ruthenium(II) (polymer, [Ru(COD)Cl2]n) afforded the paramagnetic six-coordinate ruthenium(III) p-benziporphyrin [Ru(III)(p-BzP)Cl2]. As shown by X-ray crystallography, the p-phenylene ring in both complexes is sharply tilted out of the N3 plane, as reflected by the respective N3 (pyrrole)-C6 (p-phenylene) dihedral angle [Ru(II)(p-BzP)(CO)Cl, 52...
August 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28809428/a-critical-role-of-catalyst-morphology-in-low-temperature-synthesis-of-carbon-nanotube-transition-metal-oxide-nanocomposite
#13
Xiaoyan Jin, Joohyun Lim, Yoonhoo Ha, Nam Hee Kwon, Hyeyoung Shin, In Young Kim, Nam-Suk Lee, Myung Hwa Kim, Hyungjun Kim, Seong-Ju Hwang
The effect of the catalyst morphology on the growth of carbon nanotubes (CNT) on nanostructured transition metal oxides was investigated to study a novel low-temperature synthetic route to functional CNT-transition metal oxide nanocomposites. Among several nanostructured manganese oxides with various morphologies and structures, only exfoliated 2D nanosheets of layered MnO2 acted as an effective catalyst for the chemical vapor deposition of CNT at low temperatures of 400-500 °C, which emphasizes the critical role of the catalyst morphology in CNT growth...
August 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28809417/co9s8-nanoparticles-anchored-on-nitrogen-and-sulfur-dual-doped-carbon-nanosheets-as-highly-efficient-bifunctional-electrocatalyst-for-oxygen-evolution-and-reduction-reactions
#14
Can Wu, Yuhang Zhang, Duo Dong, Haiming Xie, Jinghong Li
To promote the practical application of electrochemical energy storage and conversion systems, nonprecious electrocatalysts of low cost and with highly efficient performance in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are highly desired. In this work, a cubic sodium chloride (NaCl) crystal-templated strategy is proposed for coupling Co9S8 nanoparticles to nitrogen- and sulfur-doped carbon nanosheets (Co9S8/N,S-CNS) by facile pyrolysis. The nitrogen and sulfur dual-doped carbon nanosheets can effectively prevent the aggregation of Co9S8 nanoparticles and greatly improve the conductivity of the hybrid structure...
August 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28806069/oxidation-kinetics-of-bromophenols-by-nonradical-activation-of-peroxydisulfate-in-the-presence-of-carbon-nanotube-and-formation-of-brominated-polymeric-products
#15
Chao-Ting Guan, Jin Jiang, Cong-Wei Luo, Jun Ma, Su-Yan Pang, Yang Zhou, Yi Yang
This work demonstrated that bromophenols (BrPs) could be readily oxidized by peroxydisulfate (PDS) activated by a commercial carbon nanotube (CNT), while furfuryl alcohol (a chemical probe for singlet oxygen (1O2)) was quite refractory. Results obtained by radical quenching experiments, electron paramagnetic resonance spectroscopy, and Fourier transform infrared spectroscopy further confirmed the involvement of nonradical PDS-CNT complexes rather than 1O2. Bicarbonate and chloride ion exhibited negligible impacts on BrPs degradation by the PDS/CNT system, while a significant inhibitory effect was observed for natural organic matter...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28805876/few-layered-mos2-c-with-expanding-d-spacing-as-a-high-performance-anode-for-sodium-ion-batteries
#16
Peng Zhang, Furong Qin, Lei Zou, Mengran Wang, Kai Zhang, Yanqing Lai, Jie Li
Sodium-ion batteries (SIBs) show great potential as alternative energy storage devices for next generation energy storage systems due to the deficiency of lithium resources. MoS2 is a promising anode material for SIBs due to its high theoretical sodium storage capability and large interspace for accommodating sodium ions with a larger ionic radius than lithium ions. However, bulk MoS2 exhibits a sluggish kinetics for the intercalation-deintercalation of sodium ions and large volume expansion, which result in poor cyclability and rate performance...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805369/solid-state-sensor-for-simultaneous-measurement-of-total-alkalinity-and-ph-of-seawater
#17
Ellen M Briggs, Sergio Sandoval, Ahmet Erten, Yuichiro Takeshita, Andrew C Kummel, Todd R Martz
A novel design is demonstrated for a solid state, reagent-less sensor capable of rapid and simultaneous measurement of pH and Total Alkalinity (AT) using ion sensitive field effect transistor (ISFET) technology to provide a simplified means of characterization of the aqueous carbon dioxide system through measurement of two "master variables": pH and AT. ISFET-based pH sensors that achieve 0.001 precision are widely used in various oceanographic applications. A modified ISFET is demonstrated to perform a nL-scale acid-base titration of AT in under 40 s...
August 14, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28805340/scalable-dry-production-of-superior-3d-net-like-feox-c-composite-anode-material-for-lithium-ion-battery
#18
Min Li, Haoran Du, Long Kuai, Kuangfu Huang, Yuanyuan Xia, Baoyou Geng
Carbon-based transition metal oxides are considered as an appropriate anode material candidate for lithium ion batteries. Herein, a simple and scalable dry-production method is developed to produce carbon-encapsulated 3D net-like FeOx/C material. The process simply associates with pyrolysis of solid carbon source of filter paper with adsorbed ferrite nitrate. The carbon derived from filter paper induces a carbothermal reduction to form metallic Fe, the adding carbon and metal Fe increase the conductivity of this material...
August 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28805213/oxalate-assisted-formation-of-uniform-carbon-confined-sno2-nanotubes-with-enhanced-lithium-storage
#19
Chunhua Han, Baoxuan Zhang, Kangning Zhao, Jiashen Meng, Qiu He, Pan He, Wei Yang, Qi Li, Liqiang Mai
SnO2 nanotubes are synthesized via an oxalate-assisted "redox etching and precipitating" route between MnOOH nanowires and Sn(2+) ions. The addition of oxalate is found to be crucial to guide the formation of uniform SnO2 nanotubes. To further improve the conductivity and stability, the as-obtained SnO2 nanotubes are coated with a thin carbon layer. The resulting carbon-confined SnO2 nanotubes possess superior rate performance as an anode material for lithium-ion batteries.
August 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28802224/speciation-of-the-trivalent-f-elements-eu-iii-and-cm-iii-in-digestive-media
#20
Claudia Wilke, Astrid Barkleit, Thorsten Stumpf, Atsushi Ikeda-Ohno
In case radioactive materials are released into the environment, their incorporation into our digestive system would be a significant concern. Trivalent f-elements, i.e., trivalent actinides and lanthanides, could potentially represent a serious health risk due to their chemo- and radiotoxicity, nevertheless the biochemical behavior of these elements are mostly unknown even to date. This study, therefore, focuses on the chemical speciation of trivalent f-elements in the human gastrointestinal tract. To simulate the digestive system artificial digestive juices (saliva, gastric juice, pancreatic juice and bile fluid) were prepared...
August 4, 2017: Journal of Inorganic Biochemistry
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