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https://www.readbyqxmd.com/read/29786972/a-lyophilized-and-thermal-two-step-synthesis-of-cofe-alloy-nanoparticles-embedded-in-n-doped-carbon-nanosheets-carbon-nanotubes-for-highly-efficient-oxygen-evolution-reaction
#1
Yang Liu, Feng Li, Haidong Yang, Jing Li, Ping Ma, Yan Zhu, Jiantai Ma
There is a vital need to explore highly-efficient and stable nonprecious-metal catalysts for oxygen evolution reaction (OER) to reduce the overpotential and further improve the energy conversion efficiency. Herein, we report a unique and cost-effective lyophilized and thermal two step procedure to synthesize high-performance CoFe alloy nanoparticles embedded in N-doped carbon nanosheets interspersed with carbon nanotubes (CoFe-N-CN/CNTs) hybrid. The lyophilization step during catalysts preparation is beneficial to uniform the dispersion of carbon-like precursors and avoid the agglomeration of metal particles...
May 22, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29786934/origin-of-photoluminescence-enhancement-of-gold-doped-silver-nanoclusters-importance-of-relativistic-effects-and-heterogeneous-gold-silver-interaction
#2
Xiao-Ying Xie, Pin Xiao, Xiaoyan Cao, Wei-Hai Fang, Ganglong Cui, Michael Franz Dolg
The weak photoluminescence of silver nanoclusters suppresses their broad applications as luminescent nanomaterials. Recent experiments however showed that Au-doping can significantly enhance the photoluminescence intensity of Ag_29 nanoclusters, whereas molecular and physical origins of this effect remain unknown. Therefore we have computationally explored geometric and electronic structures of Ag_29 and its Au-doped Ag_29-xAu_x (x=1-5) nanoclusters in the S_0 and S_1 states. We found that (1) relativistic effects mainly originating from the Au atoms play an important role in enhancing the fluorescence intensity, especially for highly doped Ag_26Au_3, Ag_25Au_4, and Ag_24Au_5; (2) heteronuclear Au-Ag bonds can increase stabilities and regulate fluorescence intensities of isomers of these Au-doped nanoclusters...
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786915/reversible-oxidative-addition-reductive-elimination-of-si-h-bond-to-base-stabilized-silylenes-a-theoretical-insight
#3
Tsuyoshi Kato, Masayuku Nakagaki, Antoine Baceiredo, Shigeyoshi Sakaki
Although oxidative addition (O.A.) and reductive elimination (R.E.) are exceedingly important processes in organometallic chemistry, such processes are still extremely rare for main group element species. Here we report a theoretical study on the reaction of phosphine-stabilized silylenes with silanes which proceeds via reversible O.A./R.E. at room temperature. Of particular interest, this theoretical approach highlights the important role of the ligand, which can greatly affect kinetics and energy balance of the reaction...
May 22, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29786901/degradable-polymers-and-nanoparticles-built-from-salicylic-acid
#4
Saeed Akkad, Christopher J Serpell
As more evidence emerges supporting the possibility that nonsteroidal anti-inflammatory drugs, especially aspirin (acetyl salicylic acid), might have a role in the prevention and management of certain types of cancer, there have been several attempts to fabricate salicylic acid-based polymers that can be employed in the targeted therapy of tumors. The primary disadvantage so far has been in use of nontherapeutic polymeric backbones that constitute the majority of the therapeutic particle's size. The focus of this research is the creation of a biodegradable polymer consisting only of salicylic acid, and its use as the main building block in targeted nanotherapeutics that would consequently provide both high local dose and sustained release of the active moiety...
May 22, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29786899/improved-stable-indocyanine-green-icg-mediated-cancer-optotheranostics-with-naturalized-hepatitis-b-core-particles
#5
Wenjun Shan, Ronghe Chen, Qiang Zhang, Jie Zhao, Binbin Chen, Xi Zhou, Shefang Ye, Shengli Bi, Liming Nie, Lei Ren
In recent years, hepatitis B core protein virus-like particle (HBc VLP) is an impressive biomaterial, which has attracted considerable attention due to favorable properties such as structural stability, high uptake efficiency, and biocompatibility in biomedical applications. Heretofore, only a few attempts have been made to apply it in physical, chemical, and biological therapy for cancer. In this study, a tumor-targeting RGD-HBc VLP is first fabricated through genetic engineering. For image-guided cancer phototherapy, indocyanine green (ICG) is loaded into RGD-HBc VLP via a disassembly/reassembly pathway and electrostatic attraction with high efficiency...
May 22, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29786887/perovskite-solar-cells-with-inorganic-electron-and-hole-transport-layers-exhibiting-long-term-%C3%A2-500-h-stability-at-85-%C3%A2-c-under-continuous-1-sun-illumination-in-ambient-air
#6
Seongrok Seo, Seonghwa Jeong, Changdeuck Bae, Nam-Gyu Park, Hyunjung Shin
Despite the high power conversion efficiency (PCE) of perovskite solar cells (PSCs), poor long-term stability is one of the main obstacles preventing their commercialization. Several approaches to enhance the stability of PSCs have been proposed. However, an accelerating stability test of PSCs at high temperature under the operating conditions in ambient air remains still to be demonstrated. Herein, interface-engineered stable PSCs with inorganic charge-transport layers are shown. The highly conductive Al-doped ZnO films act as efficient electron-transporting layers as well as dense passivation layers...
May 22, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29786864/testing-the-roles-of-vertical-transmission-and-drought-stress-in-the-prevalence-of-heritable-fungal-endophytes-in-annual-grass-populations
#7
Brittany R Cavazos, Teresa F Bohner, Marion L Donald, Michelle E Sneck, Alan Shadow, Marina Omacini, Jennifer A Rudgers, Tom E X Miller
Beneficial inherited symbionts are expected to reach high prevalence in host populations, yet many are observed at intermediate prevalence. Theory predicts that a balance of fitness benefits and efficiency of vertical transmission may interact to stabilize intermediate prevalence. We established populations of grass hosts (Lolium multiflorum) that varied in prevalence of a heritable fungal endophyte (Epichloё occultans), allowing us to infer long-term equilibria by tracking change in prevalence over one generation...
May 22, 2018: New Phytologist
https://www.readbyqxmd.com/read/29786860/effect-of-cold-plasma-on-maintaining-the-quality-of-chub-mackerel-scomber-japonicus-biochemical-and-sensory-attributes
#8
Jing Chen, Sheng-Zhe Wang, Jun-Yu Chen, Dong-Zhi Chen, Shang-Gui Deng, Bin Xu
BACKGROUND: Atmospheric cold plasma (ACP) has emerged as a potential alternative to traditional methods for non-thermal food decontamination. However, little data are available about ACP treatment for seafood. In this study, dielectric barrier discharge (DBD) was applied to generate CP, and the aim of the study was to investigate the effectiveness of DBD-ACP on improving the quality of chub mackerel on the basis of chemical, microbial, and sensory characteristics. RESULTS: The effect of DBD-ACP on the quality of chub mackerel (Scomber japonicus) during storage was examined...
May 21, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29786856/characterization-of-pectins-extracted-from-different-varieties-of-pink-red-and-white-grapefruits-citrus-paradisi-macf-by-thermal-treatment-and-thermosonication
#9
Enzo L La Cava, Esteban Gerbino, Sonia C Sgroppo, Andrea Gómez-Zavaglia
The physical and chemical properties of pectin extracts obtained from different white and pink/red varieties of grapefruit [Citrus paradisi (Macf.)], using both conventional heating (CHE) and thermosonication (TS), were investigated. The content of galacturonic acid (GalA), degree of esterification (%DM), color and antioxidant capacity were analyzed. Fourier-Transform Infrared Spectroscopy (FTIR) associated with multivariate analysis enabled a structural comparison among the pectin extracts, and differential scanning calorimetry (DSC) completed a full landscape of the investigated extracts...
May 22, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29786854/muffins-elaborated-with-optimized-monoglycerides-oleogels-from-solid-fat-replacer-obtention-to-product-quality-evaluation
#10
Anabella S Giacomozzi, María E Carrín, Camila A Palla
This study demonstrates the effectiveness of using oleogels from high oleic sunflower oil (HOSO) and monoglycerides as solid fat replacers in a sweet bakery product. Firstly, a methodology to obtain oleogels with desired properties based on mathematical models able to describe relationships between process and product characteristics variables followed by multi-objective optimization was applied. Later, muffins were prepared with the optimized oleogels and their physicochemical and textural properties were compared with those of muffins formulated using a commercial margarine (Control) or only HOSO...
May 22, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29786851/annual-report-to-the-nation-on-the-status-of-cancer-part-ii-recent-changes-in-prostate-cancer-trends-and-disease-characteristics
#11
Serban Negoita, Eric J Feuer, Angela Mariotto, Kathleen A Cronin, Valentina I Petkov, Sarah K Hussey, Vicki Benard, S Jane Henley, Robert N Anderson, Stacey Fedewa, Recinda L Sherman, Betsy A Kohler, Barbara J Dearmon, Andrew J Lake, Jiemin Ma, Lisa C Richardson, Ahmedin Jemal, Lynne Penberthy
BACKGROUND: Temporal trends in prostate cancer incidence and death rates have been attributed to changing patterns of screening and improved treatment (mortality only), among other factors. This study evaluated contemporary national-level trends and their relations with prostate-specific antigen (PSA) testing prevalence and explored trends in incidence according to disease characteristics with stage-specific, delay-adjusted rates. METHODS: Joinpoint regression was used to examine changes in delay-adjusted prostate cancer incidence rates from population-based US cancer registries from 2000 to 2014 by age categories, race, and disease characteristics, including stage, PSA, Gleason score, and clinical extension...
May 22, 2018: Cancer
https://www.readbyqxmd.com/read/29786840/spray-drying-of-milk-blackberry-pulp-mixture-effect-of-carrier-agent-on-the-physical-properties-of-powder-water-sorption-and-glass-transition-temperature
#12
Matheus Boeira Braga, Sandra Cristina Dos Santos Rocha, Miriam Dupas Hubinger
Spray dryer was used to produce particles from a milk-blackberry pulp mixture (25%:75% (w/w)). Maltodextrin 10DE and 20DE and gum Arabic were used as adjuvants in order to improve powder quality. The particles were analyzed with emphasis on physical and physicochemical characteristics: moisture content, bulk density, particle size, morphology, water activity, anthocyanins retention, anthocyanins content, hygroscopicity, solubility, water sorption, and glass transition temperature. The best results were obtained for the paste composition of 25% concentrated milk-70% blackberry pulp-5% gum Arabic, yielding high anthocyanins retention (>87...
May 22, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29786824/intramedullary-nail-with-integrated-cephalocervical-screws-in-the-intertrochanteric-fractures-treatment-position-of-screws-in-fracture-stability
#13
Gökhan Kaynak, Mehmet Can Ünlü, Mehmet Fatih Güven, Ozan Ali Erdal, Okan Tok, Hüseyin Botanlıoğlu, Önder Aydıngöz
BACKGROUND: Stable fracture fixation is important in the treatment of intertrochanteric femur (ITF) fractures in the elderly population to prevent the loss of reduction, achieve early mobility, and restore independence. The aim of this study was to present the results of surgical treatment of stable and unstable ITF fractures using a trochanteric antegrade intramedullary nail with two cephalocervical screws in an integrated mechanism (Intertan®; Smith & Nephew, Memphis, TN) and evaluate the relationship between the loss of reduction and screw position in the femoral neck in two planes...
May 2018: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/29786764/encapsulation-of-micronutrients-resveratrol-genistein-and-curcumin-by-folic-acid-pamam-nanoparticles
#14
P Chanphai, H A Tajmir-Riahi
It has been shown that encapsulation of dietary polyphenols leads to increased solubility and bioavailability of these micronutrients. The encapsulation of dietary polyphenols resveratrol, genistein, and curcumin by folic acid-PAMAM-G3 and folic acid-PAMAM-G4 nanoparticles was studied in aqueous solution at physiological conditions, using multiple spectroscopic methods, TEM images, and docking studies. The polyphenol bindings are via hydrophilic, hydrophobic, and H-bonding contacts with resveratrol forming more stable conjugates...
May 21, 2018: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29786728/selenization-of-nimn-layered-double-hydroxide-with-enhanced-electrocatalytic-activity-for-oxygen-evolution
#15
Jing Du, Zehua Zou, Ailing Yu, Cailing Xu
Exploiting highly active oxygen evolution reaction electrocatalysts is of great importance in the cost-effective generation of clean fuels. Herein, the preparation of NiMn-layered double hydroxide with selenization is adopted to reduce the charge transfer resistance of the electrocatalytic oxygen evolution reaction and enhance electrocatalytic performance. As a result, this selenization product of NiMn-layered double hydroxide can reach a current density of 10 mA cm-2 at a low overpotential of 280 mV on glassy carbon electrode in 1...
May 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29786722/an-urchin-like-mgco-2-o-4-ppy-core-shell-composite-grown-on-ni-foam-for-a-high-performance-all-solid-state-asymmetric-supercapacitor
#16
Haiwen Gao, Xiaohong Wang, Ganghu Wang, Chen Hao, Saisai Zhou, Chengxiang Huang
In recent years, the electrochemical properties of supercapacitors have been greatly improved due to continuous improvement in their composite materials. In this study, an urchin-like MgCo2O4@PPy/NF (MgCo2O4@polypyrrole/Ni foam) core-shell structure composite material was successfully developed as an electrode for supercapacitors. The MCP-2 composite material, obtained by a hydrothermal method and in situ chemical oxidative polymerization, shows a high specific capacitance of 1079.6 F g-1 at a current density of 1 A g-1, which is much higher than that of MC (783...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786717/comparison-of-hydroxycarboxylato-imidazole-molybdenum-iv-complexes-and-nitrogenase-protein-structures-indirect-evidence-for-the-protonation-of-homocitrato-femo-cofactors
#17
Si-Yuan Wang, Wan-Ting Jin, Hong-Bin Chen, Zhao-Hui Zhou
Glycolato and R,S-lactato imidazole molybdenum(iv) complexes [Mo3SO3(glyc)2(im)5]·im·H2O (1), Na2[Mo3SO3(R,S-lact)3(im)3]·10H2O (2), and [Mo6O10(R,S-lact)2(im)10]·16H2O (3) have been isolated and characterized (H2glyc = glycolic acid, H2lact = lactic acid, im = imidazole). α-Alkoxy coordination with molybdenum [Mo-Oα-alkoxy 1.993(7)av Å] in 1 and 2 showed obvious differences to their counterpart with α-hydroxy coordination [MoIV3S4(PPh3)3(Hlact)2(lact)] [2.204(4)av Å] as shown in M. N. Sokolov, S. A...
May 22, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29786716/unexpected-protonation-state-of-glu197-discovered-from-simulations-of-tacrine-in-butyrylcholinesterase
#18
Xiao Wan, Yuan Yao, Lei Fang, Junjun Liu
Butyrylcholinesterase (BChE) has been actively involved in drug discoveries from many fields for decades. In the crystal structure of the BChE-tacrine complex, there is an unanticipated formyl-proline molecule resolved very close to tacrine, raising an essential question on how reliable it is to apply the binding pose in a crystal structure to analyze related experimental observations, in which no formyl-proline is actually involved. In this study, by performing a series of 100 ns molecular dynamics simulations, we demonstrate that it is safe to employ the structural information from this crystal structure to analyze related experimental observations...
May 22, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29786713/in-situ-fabrication-of-hollow-zno-nc-polyhedra-from-zif-8-for-the-determination-of-trace-cd-ii
#19
Xueping Zhang, Qingqing Wang, Jing Li, Liang Huang, Dengbin Yu, Shaojun Dong
In this work, a novel electrochemical sensor for Cd(ii) detection with differential pulse anodic stripping voltammetry (DPASV) is fabricated based on hollow ZnO@nitrogen-doped carbon (H-ZnO@NC) polyhedra, which are prepared from ZIF-8 via in situ tannic acid etching and a subsequent calcination process. The as-obtained H-ZnO@NC exhibits a polyhedral morphology with a well-defined hollow structure and a uniform distribution of elements C, N, O, and Zn in the shell. The unique structure of H-ZnO@NC can provide an enlarged surface area and abundant active sites...
May 22, 2018: Analyst
https://www.readbyqxmd.com/read/29786712/cocrystals-of-a-1-2-4-thiadiazole-based-potent-neuroprotector-with-gallic-acid-solubility-thermodynamic-stability-relationships-and-formation-pathways
#20
Artem O Surov, Andrei V Churakov, Alexey N Proshin, Xia-Lin Dai, Tongbu Lu, German L Perlovich
Three distinct solid forms, namely anhydrous cocrystals with 2 : 1 and 1 : 1 drug/acid ratios ([TDZ : GA] (2 : 1), [TDZ : GA] (1 : 1)), and a hydrated one having 1 : 1 : 1 drug/acid/water stoichiometry ([TDZ : GA : H2O] (1 : 1 : 1)), have been formed by cocrystallization of the biologically active 1,2,4-thiadiazole derivative (TDZ) with gallic acid (GA). The thermodynamic stability relationships between the cocrystals were rationalized in terms of Gibbs energies of the formation reactions and further verified by performing a set of competitive and exchange mechanochemical reactions...
May 22, 2018: Physical Chemistry Chemical Physics: PCCP
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