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https://www.readbyqxmd.com/read/28922495/formation-of-ni-fe-mixed-diselenide-nanocages-as-a-superior-oxygen-evolution-electrocatalyst
#1
Jianwei Nai, Yan Lu, Le Yu, Xin Wang, Xiong Wen David Lou
Exploring effective electrocatalysts is a crucial requirement for boosting the efficiency of water splitting to obtain clean fuels. Here, a self-templating strategy is reported to synthesize Ni-Fe mixed diselenide cubic nanocages for the electrocatalytic oxygen evolution reaction (OER). The diselenide nanocages are derived from corresponding Prussian-blue analog nanocages, which are first obtained by treating the nanocube precursor with a site-selective ammonia etchant. The resulting Ni-Fe mixed diselenide nanocages perform as a superior OER electrocatalyst, which affords a current density of 10 mA cm(-2) at a small overpotential of 240 mV; a high current density, mass activity, and turnover frequency of 100 mA cm(-2) , 1000 A g(-1) , and 0...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28921994/anisotropic-cracking-of-nanocrystal-superlattices
#2
Benjamin T Diroll, Xuedan Ma, Yaoting Wu, Christopher B Murray
The synthesis colloidal nanocrystals in non-polar organic solvents has led to exceptional size- and shape-control, enabling the formation of nanocrystal superlattices isostructural to atomic lattices built with nanocrystals rather than atoms. The long aliphatic ligands (e.g. oleic acid) used to achieve this control separate nanocrystals too far in the solid-state for most charge-transporting devices. Solid-state ligand exchange, which brings particles closer together and enhances conductivity, necessitates large changes in the total volume of the solid (compressive stress), which leads to film cracking...
September 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28920686/high-pressure-synthesis-of-the-cobalt-pyrochlore-oxide-pb2co2o7-with-large-cation-mixed-occupancy
#3
Junye Yang, Jianhong Dai, Zhehong Liu, Runze Yu, Hajime Hojo, Zhiwei Hu, Tunwen Pi, Yunliang Soo, Changqing Jin, Masaki Azuma, Youwen Long
The novel A2B2O7-type compound Pb2Co2O7 was synthesized at 8 GPa and 1673 K. Synchrotron X-ray diffraction shows a cubic pyrochlore structure with space group Fd3̅m. Rietveld structural analysis reveals a large cation mixed occupancy at both A and B sites by about 40%, the greatest value found in the pyrochlore family. In combination with the X-ray absorption spectroscopy results, the specific chemical composition and charge states are determined to be (Co0.6Pb0.4)(3+)2(Pb0.6Co0.4)(4+)2O7, in which both the A-site Co(3+) and the B-site Co(4+) are low-spin...
September 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28919648/optical-imaging-of-large-gyroid-grains-in-block-copolymer-templates-by-confined-crystallization
#4
Raphael Dehmel, James A Dolan, Yibei Gu, Ulrich Wiesner, Timothy D Wilkinson, Jeremy J Baumberg, Ullrich Steiner, Bodo D Wilts, Ilja Gunkel
Block copolymer (BCP) self-assembly is a promising route to manufacture functional nanomaterials for applications from nanolithography to optical metamaterials. Self-assembled cubic morphologies cannot, however, be conveniently optically characterized in the lab due to their structural isotropy. Here, the aligned crystallization behavior of a semicrystalline-amorphous polyisoprene-b-polystyrene-b-poly(ethylene oxide) (ISO) triblock terpolymer was utilized to visualize the grain structure of the cubic microphase-separated morphology...
August 22, 2017: Macromolecules
https://www.readbyqxmd.com/read/28919328/c-peptide-levels-and-the-risk-of-diabetes-and-pre-diabetes-among-chinese-women-with-gestational-diabetes
#5
Ping Yin, Ping Shao, Huikun Liu, Weiqin Li, Leishen Wang, Jing Wang, Shuang Zhang, Junhong Leng, Nan Li, Huiguang Tian, Xilin Yang, Zhijie Yu, Gang Hu
AIMS: To examine the association of connecting peptide (C-peptide) and the risks of postpartum diabetes and pre-diabetes among women with prior gestational diabetes. METHODS: A cross-sectional study of 1263 women with prior gestational diabetes was carried out at 1-5years after delivery in Tianjin, China. Logistic regression was used to assess the associations of C-peptide and the risks of diabetes and pre-diabetes. RESULTS: The multivariable-adjusted odds ratios based on different levels of C-peptide (0-33%, 34-66%, 67-90%, and >90% as C-peptide cutpoints) were 1...
August 17, 2017: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/28918785/-algorithm-for-workup-of-acute-swollen-knee-without-previous-trauma
#6
Jens Olesen, Finn Elkjær Johannsen
Acute non-traumatic swelling of the knee is a common clinical challenge. The reason for the swelling has to be explored in order to give the correct treatment. This article gives an overview of possible diagnoses and suggests an algorithm for an approach to non-traumatic knee arthritis. Fundamental in the examination is a thorough patient anamnesis, which will help to differentiate between inflammatory and non-inflammatory arthritis. If there is not an obvious degenerative reason for the knee effusion, a joint aspiration followed by synovial fluid white cell count (WCC), microscopy and/or culture will add valuable information...
September 18, 2017: Ugeskrift for Laeger
https://www.readbyqxmd.com/read/28918663/biosynthesis-of-gold-and-silver-chloride-nanoparticles-mediated-by-crataegus-pinnatifida-fruit-extract-in-vitro-study-of-anti-inflammatory-activities
#7
Jong Pyo Kang, Yeon Ju Kim, Priyanka Singh, Yue Huo, Veronika Soshnikova, Josua Markus, Sungeun Ahn, Mohan Chokkalingam, Hyun A Lee, Deok Chun Yang
This research article investigates the one-pot synthesis of gold and silver chloride nanoparticles functionalized by fruit extract of Crataegus pinnatifida as reducing and stabilizing agents and their possible roles as novel anti-inflammatory agents. Hawthorn (C. pinnatifida) fruits are increasingly popular as raw materials for functional foods and anti-inflammatory potential agents because of abundant flavonoids. The reduction of auric chloride and silver nitrate by the aqueous fruit extract led to the formation of gold and silver chloride nanoparticles...
September 18, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28918246/synthesis-of-novel-magnesium-ferrite-mgfe2o4-biochar-magnetic-composites-and-its-adsorption-behavior-for-phosphate-in-aqueous-solutions
#8
Kyung-Won Jung, Soonjae Lee, Young Jae Lee
In this work, magnesium ferrite (MgFe2O4)/biochar magnetic composites (MFB-MCs) were prepared and utilized to remove phosphate from aqueous solutions. MFB-MCs were synthesized via co-precipitation of Fe and Mg ions onto a precursor, followed by pyrolysis. Characterization results confirmed that MgFe2O4 nanoparticles with a cubic spinel structure were successfully embedded in the biochar matrix, and this offered magnetic separability with superparamagnetic behavior and enabled higher phosphate adsorption performance than that of pristine biochar and sole MgFe2O4 nanoparticles...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28915801/body-mass-index-and-type-2-diabetes-in-thai-adults-defining-risk-thresholds-and-population-impacts
#9
Keren Papier, Catherine D'Este, Chris Bain, Cathy Banwell, Sam-Ang Seubsman, Adrian Sleigh, Susan Jordan
BACKGROUND: Body mass index (BMI) cut-off values (>25 and >30) that predict diabetes risk have been well validated in Caucasian populations but less so in Asian populations. We aimed to determine the BMI threshold associated with increased type 2 diabetes (T2DM) risk and to calculate the proportion of T2DM cases attributable to overweight and obesity in the Thai population. METHODS: Participants were those from the Thai Cohort Study who were diabetes-free in 2005 and were followed-up in 2009 and 2013 (n = 39,021)...
September 15, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28915024/synthesis-and-crystal-structure-of-suboxide-solid-solutions-ti12-%C3%AE-gaxbi3-xo10
#10
Shinsaku Amano, Hisanori Yamane
Single crystals of suboxide solid solutions Ti12-δGaxBi3-xO10 (x = 1.42-1.74; δ = 0.77-0.62) were prepared at 900 °C with a Bi flux. Crystal structure analysis by X-ray diffraction (XRD) revealed that the solid solutions are isostructural with Ti12-δSn3O10 (cubic, space group Fm3̅m). The cell parameter a decreases from 13.5616(3) to 13.5402(5) Å with increasing Ga content, x, while the total valence electron number of Ti12-δGaxBi3-xO10 is maintained at 117.1 by decreasing Ti defects, δ. Stella octangula is formed by sharing of the edges of four supertetrahedra composed of O-centered Ti tetrahedra and trigonal bipyramids (oxide part)...
September 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28914376/cubic-membrane-formation-supports-cell-survival-of-amoeba-chaos-under-starvation-induced-stress
#11
Ketpin Chong, Zakaria A Almsherqi, Han-Ming Shen, Yuru Deng
Cubic membranes (CM) are highly organized membrane structures found in biological systems. They are mathematically well defined and reveal a three-dimensional nano-periodic structure with cubic symmetry. These membrane arrangements are frequently induced in cells under stress, disease conditions, or upon viral infection. In this study, we investigated CM formation in the mitochondria of amoeba Chaos carolinense and observed a striking correlation between the organism's ability to generate CM and the cell survival under starvation...
September 15, 2017: Protoplasma
https://www.readbyqxmd.com/read/28912534/multisegmented-nanowires-a-step-towards-the-control-of-the-domain-wall-configuration
#12
E Berganza, M Jaafar, C Bran, J A Fernández-Roldán, O Chubykalo-Fesenko, M Vázquez, A Asenjo
Cylindrical nanowires synthesized by controlled electrodeposition constitute excellent strategic candidates to engineer magnetic domain configurations. In this work, multisegmented CoNi/Ni nanowires are synthesized for tailoring a periodic magnetic structure determined by the balance between magnetocrystalline and magnetostatic energies. High-resolution Transmission Electron Microscopy confirms the segmented growth and the sharp transition between layers. Although both CoNi and Ni segments have similar fcc cubic crystal symmetry, their magnetic configuration is quite different as experimentally revealed by Magnetic Force Microscopy (MFM) imaging...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28911998/establishing-age-specific-reference-intervals-for-anti-m%C3%A3-llerian-hormone-in-adult-chinese-women-based-on-a-multicenter-population
#13
Xinqi Cheng, Qiong Zhang, Min Liu, Shijun Li, Zhihua Tao, Kiyoshi Ichihara, Songlin Yu, Kai Zhang, Pengchang Li, Jianhua Han, Ling Qiu
AIM OF THIS STUDY: Anti-Müllerian hormone (AMH) is useful for the assessment of ovarian reserve and treatment of individualized in vitro fertilization (IVF). The aim of this study is to establish AMH reference interval for adult Chinese women on the Beckman Beckman DxI 800 platform. MATERIAL AND METHODS: From May to September 2013, serum from 1169 apparently healthy adult females from five representative cities in China (Beijing, Hangzhou, Guangzhou, Dalian and Urumqi) were collected, and AMH was analyzed on the platform of Beckman DxI 800 automated chemiluminescence immunoassay...
September 12, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28911008/maternal-dietary-l-arginine-and-adverse-birth-outcomes-in-dar-es-salaam-tanzania
#14
Anne Marie Darling, Chloe R McDonald, Willy S Urassa, Kevin C Kain, Ramadhani S Mwiru, Wafaie W Fawzi
The amino acid arginine is a physiological precursor to nitric oxide, which is a key mediator of embryonic survival, fetal growth, and pregnancy maintenance. We evaluated the association between consumption of the amino acid arginine and the rate of adverse birth outcomes using data from a double-blind, randomized, placebo-controlled micronutrient supplementation trial among pregnant women in Dar es Salaam, Tanzania (2001-2004). Dietary intakes of arginine were assessed using repeated 24-hour recalls that were administered throughout pregnancy...
September 1, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28906439/psdaap-provably-secure-data-authenticated-aggregation-protocols-using-identity-based-multi-signature-in-marine-wsns
#15
Lifei Wei, Lei Zhang, Dongmei Huang, Kai Zhang, Liang Dai, Guojian Wu
Data authenticated aggregation is always a significant issue for wireless sensor networks (WSNs). The marine sensors are deployed far away from the security monitoring. Secure data aggregation for marine WSNs has emerged and attracted the interest of researchers and engineers. A multi-signature enables the data aggregation through one signature to authenticate various signers on the acknowledgement of a message, which is quite fit for data authenticated aggregation marine WSNs. However, most of the previous multi-signature schemes rely on the technique of bilinear pairing involving heavy computational overhead or the management of certificates, which cannot be afforded by the marine wireless sensors...
September 14, 2017: Sensors
https://www.readbyqxmd.com/read/28903562/spontaneous-octahedral-tilting-in-the-cubic-inorganic-caesium-halide-perovskites-cssnx3-and-cspbx3-x-f-cl-br-i
#16
Ruo Xi Yang, Jonathan M Skelton, Lora da Silva, Jarvist M Frost, Aron Walsh
The local crystal structures of many perovskite-structured materials deviate from the average space group symmetry. We demonstrate, from lattice-dynamics calculations based on quantum chemical force constants, that all the caesium-lead and caesium-tin halide perovskites exhibit vibrational instabilities associated with octahedral titling in their high-temperature cubic phase. Anharmonic double-well potentials are found for zone-boundary phonon modes in all compounds with barriers ranging from 108 to 512 meV...
September 14, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28903507/cd4-cd8-ratio-and-cd8-count-as-prognostic-markers-for-mortality-in-human-immunodeficiency-virus-infected-patients-on-antiretroviral-therapy-the-antiretroviral-therapy-cohort-collaboration-art-cc
#17
Adam Trickey, Margaret T May, Philipp Schommers, Jan Tate, Suzanne M Ingle, Jodie L Guest, M John Gill, Robert Zangerle, Mike Saag, Peter Reiss, Antonella d'Arminio Monforte, Margaret Johnson, Viviane D Lima, Tim R Sterling, Matthias Cavassini, Linda Wittkop, Dominique Costagliola, Jonathan A C Sterne
Background: We investigated whether CD4:CD8 ratio and CD8 count were prognostic for all-cause, AIDS, and non-AIDS mortality in virologically suppressed patients with high CD4 count. Methods: We used data from 13 European and North American cohorts of human immunodeficiency virus-infected, antiretroviral therapy (ART)-naive adults who started ART during 1996-2010, who were followed from the date they had CD4 count ≥350 cells/μL and were virologically suppressed (baseline)...
September 15, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28902976/synthesis-of-gold-nanoparticle-embedded-silver-cubic-mesh-nanostructures-using-agcl-nanocubes-for-plasmonic-photocatalysis
#18
Jang Ho Joo, Byung-Ho Kim, Jae-Seung Lee
A novel room-temperature aqueous synthesis for gold nanoparticle-embedded silver cubic mesh nanostructures using AgCl templates via a template-assisted coreduction method is developed. The cubic AgCl templates are coreduced in the presence of AuCl4(-) and Ag(+) , resulting in the reduction of AuCl4(-) into gold nanoparticles on the outer region of AgCl templates, followed by the reduction of AgCl and Ag(+) into silver cubic mesh nanostructures. Removal of the template clearly demonstrates the delicately designed silver mesh nanostructures embedded with gold nanoparticles...
September 13, 2017: Small
https://www.readbyqxmd.com/read/28901753/synthesis-of-a-cu-filled-rh17s15-framework-microwave-polyol-process-versus-high-temperature-route
#19
Maria Roslova, Pavlo Golub, Lars Opherden, Alexander Ovchinnikov, Marc Uhlarz, Alexey I Baranov, Yurii Prots, Anna Isaeva, Mauro Coduri, Thomas Herrmannsdörfer, Joachim Wosnitza, Thomas Doert, Michael Ruck
Metal-rich, mixed copper-rhodium sulfide Cu3-δRh34S30 that represents a new Cu-filled variant of the Rh17S15 structure has been synthesized and structurally characterized. Copper content in the [CuRh8] cubic cluster was found to vary notably dependent on the chosen synthetic route. Full site occupancy was achieved only in nanoscaled Cu3Rh34S30 obtained by a rapid, microwave-assisted reaction of CuCl, Rh2(CH3CO2)4 and thiosemicarbazide at 300 °C in just 30 min; whereas merely Cu-deficient Cu3-δRh34S30 (2...
September 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28899402/the-international-food-unit-a-new-measurement-aid-that-can-improve-portion-size-estimation
#20
T Bucher, M Weltert, M E Rollo, S P Smith, W Jia, C E Collins, M Sun
BACKGROUND: Portion size education tools, aids and interventions can be effective in helping prevent weight gain. However consumers have difficulties in estimating food portion sizes and are confused by inconsistencies in measurement units and terminologies currently used. Visual cues are an important mediator of portion size estimation, but standardized measurement units are required. In the current study, we present a new food volume estimation tool and test the ability of young adults to accurately quantify food volumes...
September 12, 2017: International Journal of Behavioral Nutrition and Physical Activity
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