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https://www.readbyqxmd.com/read/28098309/multi-shelled-ceria-hollow-spheres-with-a-tunable-shell-number-and-thickness-and-their-superior-catalytic-activity
#1
Yuanyuan Liao, Yuan Li, Lei Wang, Yongxia Zhao, Danyang Ma, Biqing Wang, Yongxia Wan, Shengliang Zhong
In this work, ceria multi-shelled nanospheres with a tunable shell number and thickness were prepared by a facile coordination polymer (CP) precursor method without the use of any template and surfactant. Interestingly, the number, thickness and structure of the shell can be tuned by varying the reaction time, reaction temperature, ratio of reagent and calcination temperature. The formation process of the multi-shelled hollow spheres was also investigated, which experienced a core contraction and shell separation process...
January 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28098304/real-time-monitoring-of-plasmon-induced-dissociative-electron-transfer-to-the-potential-dna-radiosensitizer-8-bromoadenine
#2
R Schürmann, I Bald
The excitation of localized surface plasmons in noble metal nanoparticles (NPs) results in different nanoscale effects such as electric field enhancement, the generation of hot electrons and a temperature increase close to the NP surface. These effects are typically exploited in diverse fields such as surface-enhanced Raman scattering (SERS), NP catalysis and photothermal therapy (PTT). Halogenated nucleobases are applied as radiosensitizers in conventional radiation cancer therapy due to their high reactivity towards secondary electrons...
January 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28098288/ag-au-bimetallic-nanoclusters-formed-from-a-homogeneous-gas-phase-a-new-thermodynamic-expression-confirmed-by-molecular-dynamics-simulation
#3
H Akbarzadeh, A N Shamkhali, E Mehrjouei
In this work, two probabilistic and thermodynamic limits for formation of a bimetallic nanocluster from a homogeneous gas phase were obtained in order to investigate the related phenomena using molecular dynamics simulation. Therefore, by application of some simple assumptions from thermodynamics and statistical mechanics, a new expression for composition of the nanocluster was derived which depends only on the initial conditions of the system and one adjustable parameter. This expression can be easily fitted to the results of molecular dynamics and can be used as a measure of the thermodynamic contribution in the cluster formation process...
January 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28097861/light-driven-au-wo3-c-janus-micromotors-for-rapid-photodegradation-of-dye-pollutants
#4
Qilu Zhang, Renfeng Dong, Yefei Wu, Wei Gao, Zihan He, Biye Ren
A novel light-driven Au-WO3@C Janus micromotor based on colloidal carbon WO3 nanoparticle composite spheres (WO3@C) prepared by one-step hydrothermal treatment is described. The Janus micromotors can move in aqueous media at a speed of 16 μm/s under 40 mW/cm2 UV light due to diffusiophoretic effects. The propulsion of such Au-WO3@C Janus micromotors (diameter ~1.0 μm) can be generated by UV light in pure water without any external chemical fuels and readily modulated by light intensity. After depositing a paramagnetic Ni layer between Au layer and WO3, the motion direction of the micromotor can be precisely controlled by an external magnetic field...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28097773/highly-stereoselective-gold-catalyzed-coupling-of-diazo-reagents-and-fluorinated-enol-silyl-ethers-to-tetrasubstituted-alkenes
#5
Fu-Min Liao, Zhong-Yan Cao, Jin-Sheng Yu, Jian Zhou
We report a highly stereoselective synthesis of all-carbon or fluorinated tetrasubstituted alkenes from diazo reagents and fluorinated enol silyl ethers, using C-F bond as a synthetic handle. Cationic Au(I) catalysis plays a key role in this reaction. Remarkable fluorine effects on the reactivity and selectivity was also observed.
January 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28097772/laser-irradiation-induced-melting-and-reduction-reaction-for-the-formation-of-pt-based-bimetallic-alloy-particles-in-liquids
#6
Changhao Liang, Shouliang Wu, Enmei Dai, Yixing Ye, Jun Liu, Zhenfei Tian, Yunyu Cai, Xiaoguang Zhu, Yechuang Han
Laser melting in liquids (LML) is one of the most effective methods to prepare bimetallic alloys, the formation process of which is always research focus but still ambiguous. In this paper, we prepared two types of Pt-based bimetallic alloys by LML, including Pt-Au alloys and Pt-iron group metal (iM = Fe/Co/Ni) alloys, and investigated the corresponding mechanisms of alloying process. Detailed component and structural characterizations indicate that laser irradiation induced a quite rapid formation process (not exceed 10 s) of Pt-Au alloy nanospheres, and the crystalline structures of Pt-Au alloys is determined by the monometallic constituents with higher content...
January 18, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28097522/severe-aortic-valve-stenosis-in-adults-is-associated-with-increased-levels-of-circulating-intermediate-monocytes
#7
Bernd Hewing, Sebastian Chi-Diep Au, Antje Ludwig, Rena Ellerbroek, Phillip van Dijck, Lisa Hartmann, Herko Grubitzsch, Carolin Giannini, Michael Laule, Verena Stangl, Gert Baumann, Karl Stangl
Individual monocyte subsets have been associated with atherosclerotic disease, but their distribution has not been evaluated in aortic valve stenosis (AS) so far. In the present study, we have asked whether levels of the circulating intermediate monocyte subset are increased in AS. Classical (CD14++CD16-), intermediate (CD14++CD16+), and non-classical (CD14+CD16++) CD86-positive monocytes and monocyte activation (intensity of CD11b expression) were determined by flow cytometry in peripheral blood of patients with severe AS (n = 100) and matched AS-free controls (n = 75)...
January 17, 2017: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28097273/integration-of-multiple-active-sites-on-large-pore-mesoporous-silica-for-enantioselective-tandem-reactions
#8
Xuelin Xia, Jingjing Meng, Hanxin Wu, Tanyu Cheng, Guohua Liu
Facile construction of a multifunctional heterogeneous catalyst through the assembly of Au/carbene and chiral ruthenium/diamine dual complexes in large-pore mesoporous silica was developed. This enables an efficient one-pot hydration-asymmetric transfer hydrogenation enantioselective tandem reaction of haloalkynes, affording chiral halohydrins with up to 99% enantioselectivity. Combined multifunctionalities, such as substrate-promoted silanol-functionality, BF4(-) anion-bonding gold/carbene and covalent-bonding chiral ruthenium/diamine active centers, contributed cooperatively to the catalytic performance...
January 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28095682/superparamagnetic-nanoparticles-as-high-efficiency-magnetic-resonance-imaging-t2-contrast-agent
#9
Fernanda Sousa, Barbara Sanavio, Alessandra Saccani, Yun Tang, Ileana Zucca, Tamara M Carney, Alfonso Mastropietro, Paulo H Jacob Silva, Randy P Carney, Kurt Schenk, Arash O Omrani, Ping Huang, Lin Yang, Henrik M Rønnow, Francesco Stellacci, Silke Krol
Nanoparticle-based magnetic resonance imaging T2 negative agents are of great interest, and much effort is devoted to increasing cell-loading capability while maintaining low cytotoxicity. Herein, two classes of mixed-ligand protected magnetic-responsive, bimetallic gold/iron nanoparticles (Au/Fe NPs) synthesized by a two-step method are presented. Their structure, surface composition, and magnetic properties are characterized. The two classes of sulfonated Au/Fe NPs, with an average diameter of 4 nm, have an average atomic ratio of Au to Fe equal to 7 or 8, which enables the Au/Fe NPs to be superparamagnetic with a blocking temperature of 56 K and 96 K...
January 18, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28095336/psychiatric-symptoms-mediate-the-effects-of-neurological-soft-signs-on-functional-outcomes-in-patients-with-chronic-schizophrenia-a-longitudinal-path-analytic-study
#10
Ted C T Fong, Rainbow T H Ho, Adrian H Y Wan, Friendly S W Au-Yeung
Neurological soft signs (NSS) in motor coordination and sequencing occur in schizophrenia patients and are an intrinsic sign of the underlying neural dysfunctions. The present longitudinal study explored the relationships among NSS, psychiatric symptoms, and functional outcomes in 151 Chinese patients with chronic schizophrenia across a 6-month period. The participants completed neurological assessments at baseline (Time 1), psychiatric interviews at Time 1 and 3-month follow-up (Time 2), and self-report measures on daily functioning at 6-month follow-up (Time 3)...
January 9, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28095070/player-responses-to-match-and-training-demands-during-an-intensified-fixture-schedule-in-professional-rugby-league-a-case-study
#11
Craig Twist, Jamie Highton, Matthew Daniels, Nathan Mill, Graeme Close
Player loads and fatigue responses were reported in 15 professional rugby league players (24.3 ± 3.8 y) during a period of intensified fixtures. Repeated measures of internal and external loads, perceived wellbeing and jump flight time were recorded across 22 days, comprising nine training sessions and matches on days 5, 12, 15 and 21 (player exposure: 3.6 ± 0.6 matches). Mean training load (session RPE x duration) between matches was 1177, 1083, 103, and 650 AU, respectively. Relative distance in Match 1 (82 m/min) and Match 4 (79 m/min) was very likely lower in Match 2 (76 m/min) and likely higher in Match 3 (86 m/min)...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28094510/nanoporous-gold-based-electrode-morphology-libraries-for-investigating-structure-property-relationships-in-nucleic-acid-based-electrochemical-biosensors
#12
Zimple Matharu, Pallavi Daggumati, Ling Wang, Tatiana S Dorofeeva, Zidong Li, Erkin Seker
Nanoporous gold (np-Au) electrode coatings significantly enhance performance of electrochemical nucleic acid biosensors due to their three-dimensional nanoscale network, high electrical conductivity, facile surface functionalization, and biocompatibility. Contrary to planar electrodes, the np-Au electrodes also exhibit sensitive detection in the presence of common biofouling media due to their porous structure. However, the pore size of the nano-matrix plays a critical role in dictating the extent of biomolecular capture and transport...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28093590/hydrogen-diffusion-into-the-subsurfaces-of-model-metal-catalysts-from-first-principles
#13
Xiangjian Shen, Yuanjie Li, Xianglin Liu, Dandan Zhang, Jian Gao, Tianshui Liang
Diffusion pathways of atomic hydrogen on model catalyst surfaces and into subsurfaces are of great significance in the exploration of novel catalytic hydrogenation in heterogeneous catalysis. We present in detail the diffusion pathways of hydrogen on seven different open and closed model catalyst surfaces from first principles calculations. Seven transition metal catalysts with thirteen different crystal surfaces, i.e., Co(001), Ni(100) and Ni(111), Pd(100) and (111), Pt(100) and (111), Cu(100) and (111), Ag(100) and (111) and Au(100) and (111), are taken into account...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28092427/layer-dependence-and-light-tuning-surface-potential-of-2d-mos2-on-various-substrates
#14
Feng Li, Junjie Qi, Minxuan Xu, Jiankun Xiao, Yuliang Xu, Xiankun Zhang, Shuo Liu, Yue Zhang
Here surface potential of chemical vapor deposition (CVD) grown 2D MoS2 with various layers is reported, and the effect of adherent substrate and light illumination on surface potential of monolayer MoS2 are investigated. The surface potential of MoS2 on Si/SiO2 substrate decreases from 4.93 to 4.84 eV with the increase in the number of layer from 1 to 4 or more. Especially, the surface potentials of monolayer MoS2 are strongly dependent on its adherent substrate, which are determined to be 4.55, 4.88, 4.93, 5...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28092065/impact-of-celecoxib-on-inflammation-during-cancer-surgery-a-randomized-clinical-trial
#15
Jonathan G Hiller, Shienny Sampurno, Rosemary Millen, Niketh Kuruvilla, Kwok M Ho, Rob Ramsay, Bernhard Riedel
PURPOSE: During cancer surgery, prostaglandin-mediated inflammation may promote and activate micrometastatic disease with a consequent increase in long-term cancer recurrence. Cyclooxygenase-2 inhibitors, known to have anti-proliferative properties, may offset such perioperative perturbation. We investigated the effectiveness of these agents to minimize inflammatory changes during cancer surgery. METHODS: Following ethics approval, 32 patients who were to undergo major intracavity cancer surgery were enrolled in this prospective, randomized, clinical trial...
January 13, 2017: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/28090772/controlled-growth-of-1d-mose2-nanoribbons-with-spatially-modulated-edge-states
#16
Fang Cheng, Hai Xu, Wentao Xu, Pinjia Zhou, Jens Martin, Kian Ping Loh
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) possess interesting one-dimensional (1D) properties at its edges and inversion domain boundaries, where properties markedly different from the 2D-basal plane can be observed, such as 1D-metallicity and charge density waves. Although 2D-TMDCs crystals are widely grown by chemical vapour deposition (CVD), the fabrication of 1D-TMDCs ribbons is challenging due to the difficulty to confine growth in only one direction. Here we report the controlled growth of MoSe2 nanoribbons with aspect ratio >100 by using pre-patterned Se-reconstructions on Au(100)...
January 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28090745/side-group-induced-polymorphism-in-self-assembled-monolayers-3-5-bis-trifluoromethyl-benzenethiolate-films-on-au-111
#17
Asif Bashir, Eric Sauter, Najd Al-Refaie, Michael Rohwerder, Michael Zharnikov, Waleed Azzam
The structure and molecular organization of self-assembled monolayers (SAMs) depend on a complex interplay of intermolecular and molecule-substrate interactions, so that even a small change of molecular composition can results in noticeable changes in the SAM structure. Here we show that the decoration of the most basic aromatic SAM constituent, benzenethiol, with two trifluromethyl groups leads to distinct polymorphism in the respective SAMs, with the appearance of a specific structural phase or a combination of several different phases being dependent on the parameters of the preparation procedure...
January 15, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28090035/effect-of-ice-quenching-on-the-change-in-hardness-of-a-pd-au-zn-alloy-during-porcelain-firing-simulation
#18
Hye-Jeong Shin, Min-Jung Kim, Hyung-Il Kim, Yong Hoon Kwon, Hyo-Joung Seol
This study examined the effect of ice-quenching after degassing on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulations. By ice-quenching after degassing, the specimens were softened due to homogenization without the need for an additional softening heat treatment. The lowered hardness by ice-quenching after degassing was recovered greatly from the first stage of porcelain firing process by controlling the cooling rate. The increase in hardness during cooling after porcelain firing was attributed to the precipitation of the f...
January 13, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28089893/proteomic-characterization-of-the-interactions-between-fish-serum-proteins-and-waterborne-bacteria-reveals-the-suppression-of-anti-oxidative-defense-as-a-serum-mediated-antimicrobial-mechanism
#19
Miao Dong, Yimin Liang, Rajkumar Ramalingam, Sze Wing Tang, Wei Shen, Rui Ye, Singaram Gopalakrishnan, Doris Wai Ting Au, Yun Wah Lam
Fish blood is one of the crucial tissues of innate immune system, but the full repertoire of fish serum components involved in antibacterial defense is not fully identified. In this study, we demonstrated that turbot serum, but not the heat-inactivated control, significantly reduced the number of Edwardsiella tarda (E. tarda). By conjugating serum proteins with fluorescent dyes, we showed that E. tarda were coated with multiple fish proteins. In order to identify these proteins, we used E. tarda to capture turbot serum proteins and subjected the samples to shotgun proteomic analysis...
January 9, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28089080/salba-chia-salvia-hispanica-l-in-the-treatment-of-overweight-and-obese-patients-with-type-2-diabetes-a-double-blind-randomized-controlled-trial
#20
V Vuksan, A L Jenkins, C Brissette, L Choleva, E Jovanovski, A L Gibbs, R P Bazinet, F Au-Yeung, A Zurbau, H V T Ho, L Duvnjak, J L Sievenpiper, R G Josse, A Hanna
BACKGROUND AND AIM: Preliminary findings indicate that consumption of Salba-chia (Salvia hispanica L.), an ancient seed, improves management of type 2 diabetes and suppresses appetite. The aim of this study was to assesse the effect of Salba-chia on body weight, visceral obesity and obesity-related risk factors in overweight and obese adults with type 2 diabetes. METHODS: A double-blind, randomized, controlled trial with two parallel groups involved 77 overweight or obese patients with type 2 diabetes (HbA1c: 6...
December 9, 2016: Nutrition, Metabolism, and Cardiovascular Diseases: NMCD
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