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https://www.readbyqxmd.com/read/28335331/the-use-of-spray-dried-mn%C3%A2-o%C3%A2-c-composites-as-electrocatalysts-for-li-o%C3%A2-batteries
#1
Hong-Kai Yang, Chih-Chun Chin, Jenn-Shing Chen
The electrocatalytic activities of Mn₃O₄/C composites are studied in lithium-oxygen (Li-O₂) batteries as cathode catalysts. The Mn₃O₄/C composites are fabricated using ultrasonic spray pyrolysis (USP) with organic surfactants as the carbon sources. The physical and electrochemical performance of the composites is characterized by X-ray diffraction, scanning electron microscopy, particle size analysis, Brunauer-Emmett-Teller (BET) measurements, elemental analysis, galvanostatic charge-discharge methods and rotating ring-disk electrode (RRDE) measurements...
November 7, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335268/optoelectronic-and-electrochemical-properties-of-vanadium-pentoxide-nanowires-synthesized-by-vapor-solid-process
#2
Ko-Ying Pan, Da-Hua Wei
Substantial synthetic vanadium pentoxide (V₂O₅) nanowires were successfully produced by a vapor-solid (VS) method of thermal evaporation without using precursors as nucleation sites for single crystalline V₂O₅ nanowires with a (110) growth plane. The micromorphology and microstructure of V₂O₅ nanowires were analyzed by scanning electron microscope (SEM), energy-dispersive X-ray spectroscope (EDS), transmission electron microscope (TEM) and X-ray diffraction (XRD). The spiral growth mechanism of V₂O₅ nanowires in the VS process is proved by a TEM image...
July 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335201/size-and-shape-dependent-antibacterial-studies-of-silver-nanoparticles-synthesized-by-wet-chemical-routes
#3
Muhammad Akram Raza, Zakia Kanwal, Anum Rauf, Anjum Nasim Sabri, Saira Riaz, Shahzad Naseem
Silver nanoparticles (AgNPs) of different shapes and sizes were prepared by solution-based chemical reduction routes. Silver nitrate was used as a precursor, tri-sodium citrate (TSC) and sodium borohydride as reducing agents, while polyvinylpyrrolidone (PVP) was used as a stabilizing agent. The morphology, size, and structural properties of obtained nanoparticles were characterized by scanning electron microscopy (SEM), UV-visible spectroscopy (UV-VIS), and X-ray diffraction (XRD) techniques. Spherical AgNPs, as depicted by SEM, were found to have diameters in the range of 15 to 90 nm while lengths of the edges of the triangular particles were about 150 nm...
April 15, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334863/consecutive-non-natural-pz-nucleobase-pairs-in-dna-impact-helical-structure-as-seen-in-50-%C3%AE-s-molecular-dynamics-simulations
#4
Robert W Molt, Millie M Georgiadis, Nigel G J Richards
Little is known about the influence of multiple consecutive 'non-standard' ( , 6-amino-5-nitro-2(1H)-pyridone, and , 2-amino-imidazo[1,2-a]-1,3,5-triazin-4(8H)-one) nucleobase pairs on the structural parameters of duplex DNA. nucleobase pairs follow standard rules for Watson-Crick base pairing but have rearranged hydrogen bonding donor and acceptor groups. Using the X-ray crystal structure as a starting point, we have modeled the motions of a DNA duplex built from a self-complementary oligonucleotide (5΄-CTTATPPPZZZATAAG-3΄) in water over a period of 50 μs and calculated DNA local parameters, step parameters, helix parameters, and major/minor groove widths to examine how the presence of multiple, consecutive nucleobase pairs might impact helical structure...
February 28, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28333460/exceptional-structural-compliance-of-the-b12f12-2-superweak-anion
#5
Dmitry V Peryshkov, Steven H Strauss
The single-crystal X-ray structures, thermogravimetric analyses, and/or FTIR spectra of a series of salts of the B12F12(2-) anion and homoleptic Ag(L)n(+) cations are reported (L = CH2Cl2, n = 2; L = PhCH3, n = 3; L = CH3CN; n = 2-4; L = CO, n = 1, 2). The superweak-anion nature of B12F12(2-) (Y(2-)) was demonstrated by the rapid reaction of microcrystalline Ag2(Y) with 1 atm of CO to form a nonclassical silver(I) carbonyl compound with an FTIR ν(CO) band at 2198 cm(-1) (and with the proposed formula [Ag(CO)n]2[Y])...
March 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28333106/isolation-characterization-and-antiproliferative-activity-of-new-metabolites-from-the-south-african-endemic-red-algal-species-laurencia-alfredensis
#6
Godwin A Dziwornu, Mino R Caira, Jo-Anne de la Mare, Adrienne L Edkins, John J Bolton, Denzil R Beukes, Suthananda N Sunassee
The marine red algae of the genus Laurencia have been widely studied for their structurally diverse and biologically active secondary metabolites. We report here the natural product investigation of the organic extract of a newly identified South African endemic species, Laurencia alfredensis. A sequence of column chromatography, preparative TLC and normal phase HPLC resulted in the isolation of eleven compounds comprising three labdane-type diterpenes (1-3), four polyether triterpenes (4-7), three cholestane-type ecdysteroids (8-10) and a glycolipid (11)...
March 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28333090/biscembranoids-and-cembranoids-from-the-soft-coral-sarcophyton-elegans
#7
Wei Li, Yi-Hong Zou, Man-Xi Ge, Lan-Lan Lou, Yun-Shao Xu, Abrar Ahmed, Yun-Yun Chen, Jun-Sheng Zhang, Gui-Hua Tang, Sheng Yin
Two novel biscembranoids, sarelengans A and B (1 and 2), five new cembranoids, sarelengans C-G (3-7), along with two known cembranoids (8 and 9) were isolated from the South China Sea soft coral Sarcophyton elegans. Their structures were determined by spectroscopic and chemical methods, and those of 1, 4, 5, and 6 were confirmed by single crystal X-ray diffraction. Compounds 1 and 2 represent the first example of biscembranoids featuring a trans-fused A/B-ring conjunction between the two cembranoid units. Their unique structures may shed light on an unusual biosynthetic pathway involving a cembranoid-∆⁸ rather than the normal cembranoid-∆¹ unit in the endo-Diels-Alder cycloaddition...
March 23, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28333055/enhanced-adsorption-removal-of-anionic-dyes-via-a-facile-preparation-of-amino-functionalized-magnetic-silica
#8
Xiao-Shui Li, Yu-Han Fan, Shou-Wen Zhang, Shi-Hua Qi
A novel amino-functionalized magnetic silica (Fe3O4@SiO2-NH2) was easily prepared via a one-step method integrating the immobilization of 3-aminopropyltriethoxysilane with a sol-gel process of tetraethyl orthosilicate into a single process. This showed significant improvement in the adsorption capacity of anionic dyes. The product (Fe3O4@SiO2-NH2) was characterized with scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometry, zeta potential and vibrating sample magnetometry...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333049/uranium-biosorption-from-aqueous-solution-by-the-submerged-aquatic-plant-hydrilla-verticillata
#9
Zheng-Ji Yi, Jun Yao, Mi-Jia Zhu, Hui-Lun Chen, Fei Wang, Xing Liu
The biosorption characteristics of U(VI) from aqueous solution onto a nonliving aquatic macrophyte, Hydrilla verticillata (dry powder), were investigated under various experimental conditions by using batch methods. Results showed that the adsorption reached equilibrium within 60 min and the experimental data were well fitted by the pseudo-first-order kinetic model. U(VI) adsorption was strongly pH dependent, and the optimum pH for U(VI) removal was 5.5. Isotherm adsorption data displayed good correlation with the Langmuir model, with a maximum monolayer adsorption capacity of 171...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332676/application-of-the-dimensional-reduction-formalism-to-pb9-xbax-li2-p2o7-2-p4o13-2-x-0-2-6-7-a-series-of-phosphates-with-two-types-of-isolated-polyphosphate-groups
#10
Xiangyu Zhang, Hongping Wu, Qiong Liu, Xiaoyu Dong, Yunlei Chen, Zhihua Yang, Xiao-Dong Wen, Shilie Pan
A series of phosphates, Pb9-xBax[Li2(P2O7)2(P4O13)2] (x = 0, 2, 6, 7), have been synthesized by a high temperature solution method and the crystal structures were determined by single crystal X-ray diffraction. They are isostructural and crystallize in the triclinic space group P1[combining macron]. It is interesting that there are two kinds of isolated polyphosphate anionic groups coexisting in the crystal structure, which is rare among phosphates. Their structures exhibit zero-dimensional [Li2(P2O7)2(P4O13)2](18-) anionic clusters constructed by the LiO4, P2O7 and P4O13 groups, which are separated by the Pb(2+) or Ba(2+) cations...
March 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28332602/silver-metal-nano-matrixes-as-high-efficiency-and-versatile-catalytic-reactors-for-environmental-remediation
#11
Ludovic F Dumée, Zhifeng Yi, Blaise Tardy, Andrea Merenda, Elise des Ligneris, Ray R Dagastine, Lingxue Kong
Nano-porous metallic matrixes (NMMs) offer superior surface to volume ratios as well as enhanced optical, photonic, and electronic properties to bulk metallic materials. Such behaviours are correlated to the nano-scale inter-grain metal domains that favour the presence of electronic vacancies. In this work, continuous 3D NMMs were synthesized for the first time through a simple diffusion-reduction process whereby the aerogel matrix was functionalized with (3-Mercaptopropyl)trimethoxysilane. The surface energy of the silica monolith templates was tuned to improve the homogeneity of the reduction process while thiol functionalization facilitated the formation of a high density of seeding points for metal ions to reduce...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332562/new-insights-on-the-biomineralisation-process-developing-in-human-lungs-around-inhaled-asbestos-fibres
#12
Fabrizio Bardelli, Giulia Veronesi, Silvana Capella, Donata Bellis, Laurent Charlet, Alessia Cedola, Elena Belluso
Once penetrated into the lungs of exposed people, asbestos induces an in vivo biomineralisation process that leads to the formation of a ferruginous coating embedding the fibres. The ensemble of the fibre and the coating is referred to as asbestos body and is believed to be responsible for the high toxicological outcome of asbestos. Lung tissue of two individuals subjected to prolonged occupational exposure to crocidolite asbestos was investigated using synchrotron radiation micro-probe tools. The distribution of K and of elements heavier than Fe (Zn, Cu, As, and Ba) in the asbestos bodies was observed for the first time...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28331906/associations-between-sarcopenia-and-degenerative-lumbar-scoliosis-in-older-women
#13
Yawara Eguchi, Munetaka Suzuki, Hajime Yamanaka, Hiroshi Tamai, Tatsuya Kobayashi, Sumihisa Orita, Kazuyo Yamauchi, Miyako Suzuki, Kazuhide Inage, Kazuki Fujimoto, Hirohito Kanamoto, Koki Abe, Yasuchika Aoki, Tomoaki Toyone, Tomoyuki Ozawa, Kazuhisa Takahashi, Seiji Ohtori
BACKGROUND: Age-related sarcopenia can cause various forms of physical disabilities. We investigated how sarcopenia affects degenerative lumbar scoliosis (DLS) and lumbar spinal canal stenosis (LSCS). METHODS: Subjects comprised 40 elderly women (mean age 74 years) with spinal disease whose chief complaints were low back pain and lower limb pain. They included 15 cases of DLS (mean 74.8 years) and 25 cases of LSCS (mean age 72.9 years). We performed whole-body dual-energy X-ray absorptiometry (DXA) to analyze body composition, including appendicular and trunk skeletal muscle mass index (SMI; lean mass (kg)/height (m)(2)) and bone mineral density (BMD)...
2017: Scoliosis and Spinal Disorders
https://www.readbyqxmd.com/read/28331309/in-vitro-and-in-vivo-drug-release-and-antibacterial-properties-of-the-novel-vancomycin-loaded-bone-like-hydroxyapatite-poly-amino-acid-scaffold
#14
Zhidong Cao, Dianming Jiang, Ling Yan, Jun Wu
Antibiotic-loaded carriers were developed to fill cavities and locally deliver antibiotics following implantation. However, the most commonly used antibiotic carrier, polymethyl methacrylate (PMMA), has many disadvantages including that it does not promote bone regeneration or conduction. Vancomycin-loaded bone-like hydroxyapatite/poly amino acid (V-BHA/PAA) was successfully fabricated by a homogeneous method, certified as biosafe and known to promote osteogenesis. To evaluate its drug-release features, the quantity of the vancomycin in the elution was obtained every 2 days after in vitro simulated body fluid immersion...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28330352/thermal-conductivity-of-the-sideledge-in-aluminium-electrolysis-cells-experiments-and-numerical-modelling
#15
Aïmen E Gheribi, Sándor Poncsák, Sébastien Guérard, Jean-François Bilodeau, László Kiss, Patrice Chartrand
During aluminium electrolysis, a ledge of frozen electrolytes is generally formed, attached to the sides of the cells. This ledge acts as a protective layer, preventing erosion and chemical attacks of both the electrolyte melt and the liquid aluminium on the side wall materials. The control of the sideledge thickness is thus essential in ensuring a reasonable lifetime for the cells. The key property for modelling and predicting the sideledge thickness as a function of temperature and electrolyte composition is the thermal conductivity...
March 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28330288/biofabrication-and-spectral-characterization-of-silver-nanoparticles-and-their-cytotoxic-studies-on-human-cd34-ve-stem-cells
#16
Venkata S Kotakadi, Susmila Aparna Gaddam, Sucharitha K Venkata, P V G K Sarma, D V R Sai Gopal
Biosynthesis of plant-mediated silver nanoparticles is gaining significant importance due to environmentally safe 'green method' and it is an efficient alternative method. In the present study, silver nanoparticles were synthesized by using root extract of Glycyrrhiza glabra an important medicinal plant. The AgNPs are characterized by spectral analysis; the surface plasmon resonance (SPR) peak of AgNPs showed maximum absorption at 445 nm. Fourier-transform infrared spectroscopy (FT-IR) data show that the O-H hydroxyl groups, carboxylic acids, ester and ether groups and C-O stretching of alcohols have been utilized in the formation of AgNPs...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28329870/application-of-imaging-techniques-to-cases-of-drug-induced-crystal-nephropathy-in-preclinical-studies
#17
B Lenz, A Brink, M Siam, A De Paepe, S Bassett, A Eichinger-Chapelon, P Maliver, R Neff, U Niederhauser, B Steinhuber, R Zurbach, T Singer, C Funk, F Schuler, M Albassam, S Schadt
A number of drugs can cause precipitates within renal tubules leading to crystal nephropathy. Crystal nephropathy is usually an exposure-related finding and is not uncommon in preclinical studies, where high doses are tested. An understanding of the nature of precipitates is important for human risk assessment and further development. Our aim was to investigate the ability of various imaging techniques to detect the presence of drugs or metabolites in renal crystals. We applied matrix-assisted laser desorption/ionization - Fourier transform ion cyclotron resonance mass spectrometry (MALDI-FTICR MS) imaging, Raman and infrared microspectroscopy, scanning electron microscopy coupled with energy dispersive X-ray (SEM/EDX) spectroscopy and standard histopathology to cases of drug-induced crystal nephropathy, induced in rodents and primates by four compounds...
February 27, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28329007/highly-efficient-photocatalytic-degradation-of-methylene-blue-by-popd-tio2-nanocomposite
#18
Chuanxi Yang, Ming Zhang, Wenping Dong, Guanwei Cui, Zongming Ren, Weiliang Wang
The poly-o-phenylenediamine (PoPD)/TiO2 nanocomposite was successfully synthesized via 'in situ' oxidative polymerization method. The modified photocatalysts were characterized by BET, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrarad spectra (FT-IR), thermogravimrtic analysis (TGA), X-ray photoelectron spectroscopy (XPS), Ultraviolet-visible diffuse reflectance spectrum (UV-Vis DRS) and Photocurrent Test. The results showed that the PoPD exists on the surface of TiO2, the presence of PoPD does not impact on the lattice structure and grain size of TiO2, and the presence of PoPD enhances the visible response and photoelectric property...
2017: PloS One
https://www.readbyqxmd.com/read/28328931/x-ray-microtomography-for-ant-taxonomy-an-exploration-and-case-study-with-two-new-terataner-hymenoptera-formicidae-myrmicinae-species-from-madagascar
#19
Francisco Hita Garcia, Georg Fischer, Cong Liu, Tracy L Audisio, Gary D Alpert, Brian L Fisher, Evan P Economo
We explore the potential of x-ray micro computed tomography (μCT) for the field of ant taxonomy by using it to enhance the descriptions of two remarkable new species of the ant genus Terataner: T. balrog sp. n. and T. nymeria sp. n.. We provide an illustrated worker-based species identification key for all species found on Madagascar, as well as detailed taxonomic descriptions, which include diagnoses, discussions, measurements, natural history data, high-quality montage images and distribution maps for both new species...
2017: PloS One
https://www.readbyqxmd.com/read/28328849/protrusion-of-a-rod-into-the-spinal-canal-10-years-after-segmental-lumbar-spine-surgery
#20
Siyi Cai, Xiangyi Kong, Chengrui Yan, Yipeng Wang, Xueshuai Wan, Jialu Zhang, Guixing Qiu, Keyi Yu
The objective of this article is to report an unusual case of a spinal rod that protruded into the spinal canal after lumbar spine surgery.Only 4 cases of spinal rod migration with protrusion into the spinal canal have been reported. This is the first report of a case involving the use of posterior low lumbar segmental instrumentation with a screw-rod system. The left side of the rod gradually migrated and finally protruded into the canal and compressed the cord.A 60-year-old woman presented with pain and numbness of the posterior aspect of the left leg after a long-distance walk...
March 2017: Medicine (Baltimore)
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