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https://www.readbyqxmd.com/read/28535602/quantifying-postglacial-sediment-storage-and-denudation-rates-in-a-small-alpine-catchment-of-the-f%C3%A4-g%C3%A4-ra%C3%A8-mountains-romania
#1
Adrian C Ardelean, Alexandru Onaca, Petru Urdea, Adriana Sărășan
The study of sediment production, transport, storage and discharge in alpine drainage basins is an essential prerequisite for a better understanding of the postglacial evolution of the alpine landscape. To get an overview on sediment production and alpine landscape evolution in Romania, the current study presents the first alpine sediment storage quantification in the Romanian Carpathians. Postglacial denudation was quantified within the small alpine catchment of the Doamnei Valley (3.62km(2)), located in the central part of the Făgăraș Mountains...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535481/graphene-oxide-enzyme-hybrid-nanoflowers-for-efficient-water-soluble-dye-removal
#2
Hui Li, Jingwei Hou, Linlin Duan, Chao Ji, Yatao Zhang, Vicki Chen
High efficient enzyme immobilization on carbon based conductive supports could provide wide applications in energy and environmental science. Here, we synthesized a 3D flower-like structured self-assembly hybrid nanocomposite with copper phosphate, laccase, graphite oxide (GO) and carbon nanotubes (CNTs) via a facile one-pot strategy under mild conditions. The prepared nanocomposite exhibited very high enzyme loading and improved laccase activity. During the formation of the nanocomposite, the copper phosphate-laccase petals were interwined by CNTs, and GO nanosheets were further coated on the petal surface...
May 11, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535473/length-effect-of-methoxy-poly-ethylene-oxide-b-poly-%C3%AE%C2%B5-caprolactone-g-poly-methacrylic-acid-copolymers-on-cisplatin-delivery
#3
Hsuan-Ying Chen, Yu-Lun Lo, Pei-Ling Wu, Pei-Chi Lo, Li-Fang Wang
Novel comb-shaped amphiphilic copolymers based on methoxy poly(ethylene glycol)-b-[poly(ε-caprolactone)-g-poly(methacrylic acid)] (MPCL-g-pMAA), were synthesized via ring opening polymerization (ROP) and atom transfer radical polymerization (ATRP) for drug delivery systems. MPCL-g-pMAAs with various MAA repeating units self-assemble into a core-shell structure in an aqueous solution. Critical aggregation concentrations range within 5.6×10(-3)-7.0×10(-2)mg/mL in double deionized water and 8.9×10(-3)-7.0×10(-2)mg/mL in phosphate buffered saline of pH 7...
May 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28535471/graphene-oxide-supported-carbon-nanofiber-like-network-derived-from-polyaniline-a-novel-composite-for-enhanced-glucose-oxidase-bioelectrode-performance
#4
Zepeng Kang, Kailong Jiao, Xinping Xu, Ruiyun Peng, Shuqiang Jiao, Zongqian Hu
A three-dimensional architecture of PANI@GO hybrid was synthesized via in-situ polymerization of aniline monomers on the surface of graphene oxide (GO) and carbonized at 1600°C. The SEM images showed that surfaces of planar GO were covered by a compact nanofiber-like polyaniline (PANI) layer which presented an interconnected network. Nanofiber-like PANI on the GO surface was mostly preserved and became the carbon nanofibers (CNFs) after carbonization. The TEM images showed that the carbonized PANI grew seamlessly on the GO surface and served as conductive "network" between interlayers of GO...
May 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28535451/a-novel-carbohydrate-labeling-method-utilizing-transfer-hydrogenation-mediated-reductive-amination
#5
Zsuzsanna Kovács, Gábor Papp, Henrietta Horváth, Ferenc Joó, András Guttman
One of the most frequently used high-resolution glycan analysis methods in the biopharmaceutical and biomedical fields is capillary electrophoresis with laser-induced fluorescence (CE-LIF) detection. Glycans are usually labeled by reductive amination with a charged fluorophore containing a primary amine, which reacts with the aldehyde group at the reducing end of the glycan structures. In this reaction, first a Schiff base is formed that is reduced to form a stable conjugate by a hydrogenation reagent, such as sodium cyanoborohydride...
May 13, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28535412/selective-separation-and-determination-of-glucocorticoids-in-cosmetics-using-dual-template-magnetic-molecularly-imprinted-polymers-and-hplc
#6
Min Liu, Xiaoyan Li, Junjie Li, Zongyuan Wu, Fang Wang, Li Liu, Xuecai Tan, Fuhou Lei
Molecularly imprinting polymers (MIPs) are typically prepared using a single template molecule, which allows selective separation and enrichment of only one target analyte. It is not suitable for determination of complex real samples containing multiple analytes. In order to expand the practical application of imprinted polymers, novel dual-template magnetic molecularly imprinted polymers (MMIPs) were synthesized by surface polymerization using hydrocortisone and dexamethasone as the dual-template molecules in this study...
May 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28535348/coarse-grained-modeling-of-polyethylene-melts-effect-on-dynamics
#7
Brandon L Peters, K Michael Salerno, Anupriya Agrawal, Dvora Perahia, Gary S Grest
The distinctive viscoelastic behavior of polymers results from a coupled interplay of motion on multiple length and time scales. Capturing the broad time and length scales of polymer motion remains a challenge. Using polyethylene (PE) as a model macromolecule, we construct coarse-grained (CG) models of PE with 3-6 methyl groups per CG bead and probe two critical aspects of the technique: pressure corrections required after iterative Boltzmann inversion (IBI) to generate CG potentials that match the pressure of reference fully-atomistic melt simulations and the transferability of CG potentials across temperatures...
May 23, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28535344/clarifying-the-controversial-catalytic-performance-of-co-oh-2-and-co3o4-for-oxygen-reduction-evolution-reactions-toward-efficient-zn-air-batteries
#8
Zhishuang Song, Xiaopeng Han, Yida Deng, Naiqin Zhao, Wenbin Hu, Cheng Zhong
Cobalt-based nanomaterials have been widely studied as catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) due to their remarkable bifunctional catalytic activity, low cost and easy available. However, controversial results concerning OER/ORR performance exist between different types of cobalt-based catalysts, especially for Co(OH)2 and Co3O4. To address this issue, we develop a facile electrochemical deposition method to grow Co(OH)2 directly on the skeleton of carbon cloth, and further Co3O4 was obtained by post thermal treatment...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28535341/fully-stretchable-optoelectronic-sensors-based-on-colloidal-quantum-dots-for-sensing-photoplethysmographic-signals
#9
Tae-Ho Kim, Chang-Seok Lee, Sangwon Kim, Jaehyun Hur, Sangmin Lee, Keun Wook Shin, Young-Zoon Yoon, Moon Kee Choi, Jiwoong Yang, Dae-Hyeong Kim, Taeghwan Hyeon, Seongjun Park, Sungwoo Hwang
Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, and energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important in the realization of wearable displays and biomedical devices, but specific structural design as well as selection of materials should preferentially accompany this technology to realize stretchable forms of these devices. Here, we report stretchable optoelectronic sensors manufactured using colloidal QDs and integrated with elastomeric substrates, whose optoelectronic properties are stable under various deformations...
May 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28535261/recruitment-of-a-lineage-specific-virulence-regulatory-pathway-promotes-intracellular-infection-by-a-plant-pathogen-experimentally-evolved-into-a-legume-symbiont
#10
Delphine Capela, Marta Marchetti, Camille Clérissi, Anthony Perrier, Dorian Guetta, Carine Gris, Marc Valls, Alain Jauneau, Stéphane Cruveiller, Eduardo P C Rocha, Catherine Masson-Boivin
Ecological transitions between different lifestyles, such as pathogenicity, mutualism and saprophytism, have been very frequent in the course of microbial evolution, and often driven by horizontal gene transfer. Yet, how genomes achieve the ecological transition initiated by the transfer of complex biological traits remains poorly known. Here we used experimental evolution, genomics, transcriptomics and high-resolution phenotyping to analyze the evolution of the plant pathogen Ralstonia solanacearum into legume symbionts, following the transfer of a natural plasmid encoding the essential mutualistic genes...
May 23, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28535201/regulatory-t-cells-ameliorate-tissue-plasminogen-activator-induced-brain-haemorrhage-after-stroke
#11
Leilei Mao, Peiying Li, Wen Zhu, Wei Cai, Zongjian Liu, Yanling Wang, Wenli Luo, Ruth A Stetler, Rehana K Leak, Weifeng Yu, Yanqin Gao, Jun Chen, Gang Chen, Xiaoming Hu
Delayed thrombolytic treatment with recombinant tissue plasminogen activator (tPA) may exacerbate blood-brain barrier breakdown after ischaemic stroke and lead to lethal haemorrhagic transformation. The immune system is a dynamic modulator of stroke response, and excessive immune cell accumulation in the cerebral vasculature is associated with compromised integrity of the blood-brain barrier. We previously reported that regulatory T cells, which function to suppress excessive immune responses, ameliorated blood-brain barrier damage after cerebral ischaemia...
May 22, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28535039/deposition-of-gold-nanotriangles-in-large-scale-close-packed-monolayers-for-x-ray-based-temperature-calibration-and-sers-monitoring-of-plasmon-driven-catalytic-reactions
#12
Ferenc Liebig, Radwan M Sarhan, Mathias Sander, Wouter A Koopman, Roman Schuetz, Matias Bargheer, Joachim Koetz
Anisotropic plasmonic particles such as gold nanotriangles have extraordinary structural, optical and physico-chemical properties. For many applications in different fields it is essential to prepare them in a chemically and physically stable, structurally well-defined manner, e.g., as large and uniform coverage on a substrate. We present a direct method for the large scale close-packed monolayer formation of edge-to-edge ordered, ultrathin crystalline gold nanotriangles on Si-wafers or quartz glass via the transfer of these asymmetric particles to the air-liquid interface after adding ethanol-toluene mixtures without any subsequent surface functionalization...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28535036/reversible-bond-cation-coupled-electron-transfer-on-phenylenediamine-based-rhodamine-b-and-its-application-on-electrochromism
#13
Xiaojun Wang, Shuo Wang, Chang Gu, Weiran Zhang, Hongzhi Zheng, Jingjing Zhang, Geyu Lu, Yu-Mo Zhang, Minjie Li, Sean Xiao-An Zhang
A bio-mimetic system on reversible bond coupled electron transfer (BCET) has been proposed and investigated in a switchable Rh-N molecule with redox active subunits. We discover that energy barrier of C-N bond breaking is reduced dramatically to less than 1/7 (from 40.4 kcal/mol to 5.5 kcal/mol), and 1/3 of the oxidation potential has been simultaneously lowered (from 0.67 V to 0.43 V) with the oxidation of Rh-N. The concept, cation coupled electron transfer (CCET), is highly recommended by analyzing existing proton coupled electron transfer (PCET) and metal coupled electron transfer (MCET) along with aforementioned BCET, which have same characteristic of transferring positive charges, such as proton, metal ion, and organic cation...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534919/solid-state-and-surface-effects-in-thin-film-molecular-switches
#14
Jonathan P Hopwood, Jacob W Ciszek
Thin-films of three dihydroindolizine molecular switches were monitored via polarization modulation infrared reflection absorption spectroscopy to quantify solid state and surface-based inhibition of switching as a function of irradiation time. In the solid state, the molecular switches diverged dramatically with flexible alkyl substituents resulting in switching rates up to three times that of switches containing rigid analogs. For thin-films, decreasing film thickness from 30 nm to approximately 4 molecules thick resulted in an increase in inhibition...
May 23, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28534917/charge-stabilizing-tris-triphenylamine-zinc-porphyrin-carbon-nanotube-hybrids-synthesis-characterization-and-excited-state-charge-transfer-studies
#15
Luis M Arellano, Myriam Barrejón, Habtom B Gobeze, María J Gómez-Escalonilla, José Luis G Fierro, Francis D'Souza, Fernando Langa
Functionalization of single-walled (SWCNTs) and double-walled carbon nanotubes (DWCNTs) with a charge stabilizing zinc porphyrin functionalized with triphenylamine entities has been accomplished. The synthetic approach involved the reaction of tris-(triphenylamine)porphyrinato zinc(ii) with iodobenzene functionalized nanotubes through a Sonogashira C-C cross coupling reaction under microwave irradiation conditions. Evidence of covalent functionalization and the extent of functionalization was obtained from systematic studies carried out by AFM, TGA, XPS and Raman spectroscopy techniques...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534909/engineering-band-gap-and-electronic-transport-in-organic-inorganic-halide-perovskites-by-superlattices
#16
Rahul Singh, Ranjith Kottokkaran, Vikram L Dalal, Ganesh Balasubramanian
Organic/inorganic lead and tin halide perovskites (CH3NH3PbI3 and CH3NH3SnI3) have been promising for photovoltaics because of their high charge carrier mobility, and large absorption coefficient and diffusion length. Both these perovskites also have a notable Seebeck coefficient, depending on the doping level, indicating their potential as thermoelectrics. We create superlattices of these hybrid organic-inorganic halide perovskites and investigate electronic transport through them using first principles computations and experiments...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534906/configuration-dependent-anti-ambipolar-van-der-waals-p-n-heterostructures-based-on-pentacene-single-crystal-and-mos2
#17
Ji Dong, Fengjing Liu, Feng Wang, Jiawei Wang, Molin Li, Yao Wen, Liang Wang, Gongtang Wang, Jun He, Chao Jiang
Recently, van der Waals heterostructures (vdWHs) have trigged intensive interest due to their novel electronic and optoelectronic properties. The vdWHs could be achieved by stacking two dimensional layered materials (2DLMs) on top of another and vertically kept by van der Waals forces. Furthermore, organic semiconductors are also known to interact via van der Waals forces, which offer an alternative for the fabrication of organic-inorganic p-n vdWHs. However, the performances of organic-inorganic p-n vdWHs produced so far are rather poor, owing to the unmatched electrical property between the 2DLMs and organic polycrystalline films...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534904/porous-copper-graphene-heterostructures-for-cooling-of-electronic-devices
#18
Hokyun Rho, Yea Sol Jang, Sungmin Kim, Sukang Bae, Tae-Wook Kim, Dong Su Lee, Jun-Seok Ha, Sang Hyun Lee
Recently, research on micro-electronic and optoelectronic devices has been rapidly increasing. Parts and products related to these devices are becoming smaller and more integrated within circuits. As a result, the heat generated in devices has increased greatly. When excess heat is generated, important properties are affected such as efficiency and lifetime and, in severe cases, this can result in the failure of devices. Therefore, efficient cooling is required and it becomes necessary to study the heat dissipation properties of device materials...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534897/seed-mediated-co-reduction-in-a-large-lattice-mismatch-system-synthesis-of-pd-cu-nanostructures
#19
Meredith R Kunz, Sophia M McClain, Dennis P Chen, Kallum M Koczkur, Rebecca G Weiner, Sara E Skrabalak
Metal nanoparticles (NPs) are of interest for applications in catalysis, electronics, chemical sensing, and more. Their utility is dictated by their composition and physical parameters such as particle size, particle shape, and overall architecture (e.g., hollow vs. solid). Interestingly, the addition of a second metal to create bimetallic NPs adds multifunctionality, with new emergent properties common. However, synthesizing structurally defined bimetallic NPs remains a great challenge. One synthetic pathway to architecturally controlled bimetallic NPs is seed-mediated co-reduction (SMCR) in which two metal precursors are simultaneously co-reduced to deposit metal onto shape-controlled metal seeds, which direct the overgrowth...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534829/variation-in-the-genetic-repertoire-of-viruses-infecting-micromonas-pusilla-reflects-horizontal-gene-transfer-and-links-to-their-environmental-distribution
#20
Jan F Finke, Danielle M Winget, Amy M Chan, Curtis A Suttle
Prasinophytes, a group of eukaryotic phytoplankton, has a global distribution and is infected by large double-stranded DNA viruses (prasinoviruses) in the family Phycodnaviridae. This study examines the genetic repertoire, phylogeny, and environmental distribution of phycodnaviruses infecting Micromonas pusilla, other prasinophytes and chlorophytes. Based on comparisons among the genomes of viruses infecting M. pusilla and other phycodnaviruses, as well as the genome from a host isolate of M. pusilla, viruses infecting M...
May 19, 2017: Viruses
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