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https://www.readbyqxmd.com/read/28330288/biofabrication-and-spectral-characterization-of-silver-nanoparticles-and-their-cytotoxic-studies-on-human-cd34-ve-stem-cells
#1
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/28330204/endophytic-fungal-isolate-mediated-biosynthesis-of-silver-nanoparticles-and-their-free-radical-scavenging-activity-and-anti-microbial-studies
#2
Vasudeva Reddy Netala, Venkata Subbaiah Kotakadi, Pushpalatha Bobbu, Susmila Aparna Gaddam, Vijaya Tartte
The present study reports that the biosynthesis of AgNPs using an endophytic fungus isolated from the ethnomedicinal plant Centella asiatica. The endophytic fungus was identified as Aspergillus versicolor ENT7 based on 18S rRNA gene sequencing (NCBI Accession number KF493864). The AgNPs synthesized were characterized by UV-visible spectroscopy, Fourier transform infra-red spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), particle size analyzer, and zeta potential measurements...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330190/phyto-synthesis-and-structural-characterization-of-catalytically-active-gold-nanoparticles-biosynthesized-using-delonix-regia-leaf-extract
#3
Preeti Dauthal, Mausumi Mukhopadhyay
Biological methods of nanoparticles synthesis are ecologically sound and sustainable alternative to the conventional methods. On the basis of aforesaid premise, the present study deals with the optimization and fabrication of gold nanoparticles (Au-NPs) using easily available bio-resource, Delonix regia leaf extract. The use of practically nontoxic natural extracts and water allows the synthesis pathways presented to be considered as ''green'' and so permitting the synthesized Au-NPs to be used in sensitive areas, such as bioremediation...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28326633/bias-from-depletion-of-susceptibles-the-example-of-hormone-replacement-therapy-and-the-risk-of-venous-thromboembolism
#4
Christel Renoux, Sophie Dell'Aniello, Benjamin Brenner, Samy Suissa
PURPOSE: The data on the association between hormone replacement therapy and the increased risk of venous thromboembolism (VTE) in postmenopausal women are conflicting. The observed differences between oral estrogen and oral estrogen-progestogen combination formulations may be the result of bias from depletion of susceptibles. METHODS: We used United Kingdom's Clinical Practice Research Datalink to identify the cohort of all women aged 50 to 79 during 1987-2008, with all incident cases of VTE occurring during the study period identified...
March 22, 2017: Pharmacoepidemiology and Drug Safety
https://www.readbyqxmd.com/read/28326232/role-of-oxygen-in-wetting-of-copper-nanoparticles-on-silicon-surfaces-at-elevated-temperature
#5
Tapas Ghosh, Biswarup Satpati
Copper nanoparticles have been deposited on silicon surfaces by a simple galvanic displacement reaction, and rapid thermal annealing has been performed under various atmospheric conditions. In spite of the general tendency of the agglomeration of nanoparticles to lower the surface energy at elevated temperatures, our plan-view and cross-sectional transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis shows that the thermal oxidation of the copper nanoparticles and formation of cupric oxide (CuO) on silicon surfaces leads to wetting rather than agglomeration...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28325897/energy-use-and-carbon-footprints-differ-dramatically-for-diverse-wastewater-derived-carbonaceous-substrates-an-integrated-exploration-of-biokinetics-and-life-cycle-assessment
#6
Yanbo Li, Xu Wang, David Butler, Junxin Liu, Jiuhui Qu
Energy neutrality and reduction of carbon emissions are significant challenges to the enhanced sustainability of wastewater treatment plants (WWTPs). Harvesting energy from wastewater carbonaceous substrates can offset energy demands and enable net power generation; yet, there is limited research about how carbonaceous substrates influence energy and carbon implications of WWTPs with integrated energy recovery at systems-level. Consequently, this research uses biokinetics modelling and life cycle assessment philology to explore this notion, by tracing and assessing the quantitative flows of energy embodied or captured, and by exploring the carbon footprint throughout an energy-intensive activated sludge process with integrated energy recovery facilities...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28325707/leaching-process-for-recovering-valuable-metals-from-the-lini1-3co1-3mn1-3o2-cathode-of-lithium-ion-batteries
#7
Li-Po He, Shu-Ying Sun, Xing-Fu Song, Jian-Guo Yu
In view of the importance of environmental protection and resource recovery, recycling of spent lithium-ion batteries (LIBs) and electrode scraps generated during manufacturing processes is quite necessary. An environmentally sound leaching process for the recovery of Li, Ni, Co, and Mn from spent LiNi1/3Co1/3Mn1/3O2-based LIBs and cathode scraps was investigated in this study. Eh-pH diagrams were used to determine suitable leaching conditions. Operating variables affecting the leaching efficiencies for Li, Ni, Co, and Mn from LiNi1/3Co1/3Mn1/3O2, such as the H2SO4 concentration, temperature, H2O2 concentration, stirring speed, and pulp density, were investigated to determine the most efficient conditions for leaching...
March 18, 2017: Waste Management
https://www.readbyqxmd.com/read/28323408/monodispersed-carbon-coated-cubic-nip2-nanoparticles-anchored-on-carbon-nanotubes-as-ultra-long-life-anodes-for-reversible-lithium-storage
#8
Peili Lou, Zhonghui Cui, Zhiqing Jia, Jiyang Sun, Yingbin Tan, Xiangxin Guo
In search of new electrode materials for lithium-ion batteries (LIB), metal phosphides that exhibit desirable properties such as high theoretical capacity, moderate discharge plateau and relative low polarization recently attract a great deal of attention as anode materials. However, the large volume changes and thus resulted collapse of electrode structure during long-term cycling are still the challenges for metal phosphide-based anodes. Here we report an electrode design strategy to solve these problems...
March 21, 2017: ACS Nano
https://www.readbyqxmd.com/read/28321448/acabo3-a-cs-rb-two-new-cubic-borates-with-isolated-bo3-groups
#9
Ming Wen, Hongping Wu, Xin Su, Juanjuan Lu, Zhihua Yang, Xiaohong Wu, Shilie Pan
Two alkali metal and alkaline-earth metal borates, ACaBO3 (A = Cs, Rb), were synthesized by a high temperature solution method. The powder SHG response of CsCaBO3 is approximately one time that of KH2PO4 (KDP), and its experimental band gap is 4.20 eV. The SHG density calculations indicate that the SHG effect originates from the synergistic effect of B-O and Ca-O groups. The two compounds crystallize in the cubic space group P213 and their structures feature a 3D framework composed of the CaO6 octahedra, the CsO9 polyhedra and the BO3 triangles...
March 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28320120/seasonal-variations-of-25-oh-vitamin-d-serum-levels-are-associated-with-clinical-disease-activity-in-multiple-sclerosis-patients
#10
Christina Hartl, Viola Obermeier, Lisa Ann Gerdes, Mathias Brügel, Rüdiger von Kries, Tania Kümpfel
Low 25-hydroxy vitamin D (25-[OH]-D) serum concentrations have been associated with higher disease activity in multiple sclerosis (MS) patients. In a large cross-sectional study we assessed the vitamin D status in MS patients in relation to seasonality and relapse rate. 415 MS-patients (355 relapsing-remitting MS and 60 secondary-progressive, 282 female, mean age 39.1years) of whom 25-(OH)-D serum concentrations were determined at visits between 2010 and 2013 were included in the study. All clinical data including relapse at visit and expanded disability status scale were recorded in a standardized manner by an experienced neurologist...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28319844/a-comparative-study-of-casson-fluid-with-homogeneous-heterogeneous-reactions
#11
Muhammad Ijaz Khan, Muhammad Waqas, Tasawar Hayat, Ahmed Alsaedi
Magnetohydrodynamic (MHD) stagnation point flow of Casson fluid towards a stretching sheet is addressed. Homogeneous-heterogeneous reactions together with homogeneous heat effect subject to a resistive force of electromagnetic origin is discussed. It is assumed that the homogeneous process in the ambient fluid is governed by first order kinetics and the heterogeneous process on the wall surface is given by isothermal cubic autocatalator kinetics. Ordinary differential systems have been considered. Solutions of the problems are presented via a numerical technique namely built in shooting method...
March 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28319843/facile-hydrothermal-synthesis-and-characterization-of-co2geo4-r-go-c-ternary-nanocomposite-as-negative-electrode-for-li-ion-batteries
#12
Yuvaraj Subramanian, Karthikeyan Kaliyappan, Kalai Selvan Ramakrishnan
Ternary nanocomposite of Co2GeO4/r-GO@C is synthesized by single step hydrothermal method followed by calcination. The XRD analysis reveals the formation of cubic structured Co2GeO4 and their corresponding functional groups identified through Raman analysis. The TEM analysis assures that uniform distribution of Co2GeO4 nanoparticles on the r-GO layers. The Galvanostatic charge-discharge (GCD) curve demonstrates that the initial discharge capacity of pristine Co2GeO4, Co2GeO4/r-GO and Co2GeO4/r-GO@C composite is 1400, 1284 and 1594mAhg(-1) at 50mAg(-1), respectively...
March 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28318583/effects-of-feeding-hull-less-barley-on-production-performance-milk-fatty-acid-composition-and-nutrient-digestibility-of-lactating-dairy-cows
#13
Y Yang, G Ferreira, C L Teets, B A Corl, W E Thomason, C A Griffey
The objectives of this study were to evaluate production performance, milk fatty acid composition, and nutrient digestibility in high-producing dairy cows consuming diets containing corn and hull-less barley (cultivar Amaze 10) in different proportions as the grain source. Eight primiparous and 16 multiparous Holstein cows were assigned to 1 of 4 diets in a replicated 4 × 4 Latin square design with 21-d periods. Cows were fed once daily (1200 h) by means of a Calan gate system (American Calan Inc., Northwood, NH)...
March 16, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28316409/facile-synthesis-of-multifunctional-silver-nanoparticles-using-mangrove-plant-excoecaria-agallocha-l-for-its-antibacterial-antioxidant-and-cytotoxic-effects
#14
R Bhuvaneswari, R John Xavier, M Arumugam
The current study describes a simple, rapid and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using Excoecaria agallocha (E. agallocha) leaf extract as stabilizer, bioreductant and capping agent. Synthesized AgNPs were characterized by UV-Visible spectroscopy (UV-Vis), X-ray diffraction (XRD), fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX). Generation of AgNPs was initially confirmed with the color change from yellow to dark brown which produces intense absorbance spectra at 440 nm in UV-Vis spectroscopy without any shifting of peaks...
March 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28314181/photocatalytic-degradation-effect-of-malachite-green-and-catalytic-hydrogenation-by-uv-illuminated-ceo2-cdo-multilayered-nanoplatelet-arrays-investigation-of-antifungal-and-antimicrobial-activities
#15
C Maria Magdalane, K Kaviyarasu, J Judith Vijaya, C Jayakumar, M Maaza, B Jeyaraj
CeO2/CdO multi-layered nanoplatelet arrays have been synthesized by sol-gel method at two different temperatures using Citrus limonum fruit extract and the effect of particle size on the photocatalytic performance is studied. The particle size and phases was analysed by X-ray diffraction pattern (XRD) which brought out the formation of cubic phase in the synthesized samples. Field Emission Scanning electron microscopy (FESEM) revealed the surface morphology and made up of cumulative form of platelet shaped arrays with an average size of 10nm...
March 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28304411/pressure-inverse-solubility-and-polymorphism-of-an-edible-%C3%AE-cyclodextrin-based-metal-organic-framework
#16
Ewa Patyk-Kaźmierczak, Mark R Warren, David R Allan, Andrzej Katrusiak
A very exceptional effect of pressure-induced dissolution has been revealed for an edible metal-organic framework, γ-CD-MOF-1, formed using γ-cyclodextrin and KOH base. In addition, a new polymorph of γ-CD-MOF-1 has been obtained. The trigonal structure is a symmetry sub-group modification of the cubic form. The pressure-induced dissolution of γ-CD-MOF-1 and its polymorphism are shown to be closely related and regulated by adsorption in the pores, as well as the guest framework interactions.
March 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28304174/diffusion-of-polymers-through-periodic-networks-of-lipid-based-nanochannels
#17
Reza Ghanbari, Salvatore Assenza, Abhijit Saha, Raffaele Mezzenga
We present an experimental investigation on the diffusion of unfolded polymers in the triply-periodic water-channel network of inverse bicontinuous cubic phases. Depending on the chain size, our results indicate the presence of two different dynamical regimes corresponding to Zimm and Rouse diffusion. We support our findings by scaling arguments based on a combination of blob and effective-medium theories, and suggest the presence of a third regime where dynamics is driven by reptation. Our experimental results also show an increasing behavior of the partition coefficient as a function of polymer molecular weight, indicative of a reduction of the conformational degrees of freedom induced by the confinement...
March 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28303948/transparent-polycrystalline-cubic-silicon-nitride
#18
Norimasa Nishiyama, Ryo Ishikawa, Hiroaki Ohfuji, Hauke Marquardt, Alexander Kurnosov, Takashi Taniguchi, Byung-Nam Kim, Hidehiro Yoshida, Atsunobu Masuno, Jozef Bednarcik, Eleonora Kulik, Yuichi Ikuhara, Fumihiro Wakai, Tetsuo Irifune
Glasses and single crystals have traditionally been used as optical windows. Recently, there has been a high demand for harder and tougher optical windows that are able to endure severe conditions. Transparent polycrystalline ceramics can fulfill this demand because of their superior mechanical properties. It is known that polycrystalline ceramics with a spinel structure in compositions of MgAl2O4 and aluminum oxynitride (γ-AlON) show high optical transparency. Here we report the synthesis of the hardest transparent spinel ceramic, i...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303582/generation-and-analysis-of-clinically-relevant-breast-imaging-x-ray-spectra
#19
Andrew M Hernandez, J Anthony Seibert, Anita Nosratieh, John M Boone
PURPOSE: The purpose of this work was to develop and make available x-ray spectra for some of the most widely used digital mammography (DM), breast tomosynthesis (BT), and breast CT (bCT) systems in North America. METHODS: The Monte Carlo code MCNP6 was used to simulate minimally-filtered (only beryllium) x-ray spectra at 8 tube potentials from 20 to 49 kV for DM/BT, and 9 tube potentials from 35 to 70 kV for bCT. Vendor-specific anode compositions, effective anode angles, focal spot sizes, source-to-detector distances, and beryllium filtration were simulated...
March 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28300386/evaluation-of-a-surface-imaging-system-s-isocenter-calibration-methods
#20
Adam B Paxton, Ryan P Manger, Todd Pawlicki, Gwe-Ya Kim
AlignRT is a surface imaging system that has been utilized for localizing and tracking patient position during radiotherapy. AlignRT has two calibration procedures that can set the system's isocenter called "Monthly Calibration" (MC) and "Isocentre Calibration" (IC). The MC utilizes a calibration plate. In addition to the calibration plate, the IC utilizes a cubic phantom that is imaged with the linac treatment beam to aid in aligning the AlignRT and treatment-beam isocenters. This work evaluated the effects of misaligning the calibration plate during the calibration process...
March 2017: Journal of Applied Clinical Medical Physics
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