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https://www.readbyqxmd.com/read/29144756/controlling-graphene-bio-interface-dispersions-in-animal-sera-for-enhanced-stability-and-reduced-toxicity
#1
Ajith Pattammattel, Paritosh Pande, Deepa Kuttappan, Megan Puglia, Ashis K Basu, Mary Amalaradjou, Challa V Kumar
Controlling the graphene-bio interface is important for biological applications of graphene, which is touted as the wonder material of the new century. Graphene samples made in animal sera indicated low toxicity to cells and nematodes, due to the adsorption of the serum proteins on the nascent graphene sheets. The graphite samples were exfoliated in 6 different animal sera, using three different methods, shear reactor, the kitchen blender and by ultrasonication, and maximum efficiency was noted with the kitchen blender...
November 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29143930/photovoltaic-cell-electrical-heating-system-for-removing-snow-on-panel-including-verification
#2
Agnes Weiss, Helmut Weiss
Small photovoltaic plants in private ownership are typically rated at 5 kW (peak). The panels are mounted on roofs at a decline angle of 20° to 45°. In winter time, a dense layer of snow at a width of e.g., 10 cm keeps off solar radiation from the photovoltaic cells for weeks under continental climate conditions. Practically, no energy is produced over the time of snow coverage. Only until outside air temperature has risen high enough for a rather long-time interval to allow partial melting of snow; the snow layer rushes down in an avalanche...
November 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29143621/identification-and-characterization-of-regulatory-network-components-for-anthocyanin-synthesis-in-barley-aleurone
#3
Ksenia V Strygina, Andreas Börner, Elena K Khlestkina
BACKGROUND: Among natural populations, there are different colours of barley (Hordeum vulgare L.). The colour of barley grains is directly related to the accumulation of different pigments in the aleurone layer, pericarp and lemma. Blue grain colour is due to the accumulation of anthocyanins in the aleurone layer, which is dependent on the presence of five Blx genes that are not sequenced yet (Blx1, Blx3 and Blx4 genes clustering on chromosome 4HL and Blx2 and Blx5 on 7HL). Due to the health benefits of anthocyanins, blue-grained barley can be considered as a source of dietary food...
November 14, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/29142392/quantitative-analysis-of-benzyl-isothiocyanate-in-salvadora-persica-extract-and-dental-care-herbal-formulations-using-reversed-phase-c18-high-performance-liquid-chromatography-method
#4
Maged Saad Abdel-Kader, Y T Kamal, Prawez Alam, Mohammed Hamed Alqarni, Ahmed Ibrahim Foudah
Context: Benzyl isothiocyanate is the active antimicrobial agent in Salvadora persica (siwak) widely used in Islamic countries for oral hygiene. Aims: Quantification of benzyl isothiocyanate in the ethanol extract of S. persica and some dental care herbal formulations labeled to contain siwak. Settings and Design: Simple and sensitive high-performance liquid chromatography method was designed. Subjects and Methods: Separation was achieved on reverse phase C18 (250 mm × 4...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29140700/high-pressure-behavior-of-silver-fluorides-up-to-40-gpa
#5
Adam Grzelak, Jakub Gawraczyński, Tomasz Jaroń, Dominik Kurzydłowski, Armand Budzianowski, Zoran Mazej, Piotr J Leszczyński, Vitali B Prakapenka, Mariana Derzsi, Viktor V Struzhkin, Wojciech Grochala
A combined experimental-theoretical study of silver(I) and silver(II) fluorides under high pressure is reported. For Ag(I), the CsCl-type structure is stable to at least 39 GPa; the overtone of the IR-active mode is seen in the Raman spectrum. Its Ag(II)F2 sibling is a unique compound in many ways: it is more covalent than other known difluorides, crystallizes in a layered structure, and is enormously reactive. Using X-ray diffraction and guided by theoretical calculations (density functional theory), we have been able to elucidate crystal structures of high-pressure polymorphs of AgF2...
November 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29140071/ion-implantation-modified-fluorine-doped-tin-oxide-by-zirconium-with-continuously-tunable-work-function-and-its-application-in-perovskite-solar-cells
#6
Dong Han, Cuncun Wu, Yunbiao Zhao, Yi Chen, Lixin Xiao, Ziqiang Zhao
In recent years, perovskite solar cells have drawn widespread attention. As an electrode material, fluorine-doped tin oxide (FTO) is widely used in various kinds of solar cells. However, the relatively low work function (WF) (~4.6 eV) limits its application. The potential barrier between the transparent conductive oxide (TCO) electrode and the hole transport layer (HTL) in inverted perovskite solar cells results in device performance decrease. In this paper, we propose a method to adjust WF of FTO by implanting zirconium ions into the FTO surface...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29139395/three-dimensional-architecture-hybrid-perovskite-solar-cells-using-cds-nanorod-arrays-as-an-electron-transport-layer
#7
Zihang Song, Guoqing Tong, Huan Li, Guopeng Li, Shuai Ma, Shimeng Yu, Qian Liu, Yang Jiang
Three-dimensional (3-D) architecture perovskite solar cells (PSCs) using CdS nanorod arrays as electron transport layer were designed and prepared by layer-by-layer via a physical-chemical vapor deposition process (P-CVD). The CdS NRs not only provided a scaffold to perovskite film, but also increased the interfacial contact between the perovskite film and electron transport layer. As an optimized result, a high power conversion efficiency (PCE) of 12.46% with a short-circuit current density (Jsc) of 19.88 mA cm-2, an open-circuit voltage (Voc) of 1...
November 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29139293/ti-doped-gaox-resistive-switching-memory-with-self-rectifying-behavior-by-using-nbox-pt-bilayers
#8
Ju Hyun Park, Dong Su Jeon, Tae Geun Kim
Crossbar arrays (CBA) with resistive random access memory (ReRAM) constitute an established architecture for high-density memory. However, sneak paths via unselected cells increase the total power consumption of these devices, and limit the array size. To eliminate such sneak path problems, we propose a Ti/GaOx/NbOx/Pt structure with self-rectifying resistive-switching (RS) behavior. In this structure, to reduce the operating voltage, we used a Ti/GaOxstack to increase the number of trap sites in the RS GaOx layer, through interfacial reactions between the Ti and GaOx layers...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29139224/a-polyelectrolyte-multilayer-platform-for-investigating-growth-factor-delivery-modes-in-human-liver-cultures
#9
Christine Lin, Raimundo Romero, Lioudmila V Sorokina, Kimberly R Ballinger, Laura W Place, Matt J Kipper, Salman R Khetani
Polyelectrolyte multilayers (PEMs) of chitosan and heparin are useful for mimicking growth factor (GF) binding to extracellular matrix (ECM) as in vivo. Here, we developed a PEM platform for delivering bound/adsorbed GFs to monocultures of primary human hepatocytes (PHHs) and PHH/non-parenchymal cell (NPC) co-cultures, which are useful for drug development and regenerative medicine. The effects of ECM protein coating (collagen I, fibronectin, and Matrigel®) and terminal PEM layer on PHH attachment/functions were determined...
November 15, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29138950/improvement-of-amperometric-transducer-selectivity-using-nanosized-phenylenediamine-films
#10
O V Soldatkina, I S Kucherenko, V M Pyeshkova, S A Alekseev, O O Soldatkin, S V Dzyadevych
In this work, we studied the conditions of deposition of a semipermeable polyphenylenediamine (PPD)-based membrane on amperometric disk platinum electrodes. Restricting an access of interfering substances to the electrode surface, the membrane prevents their impact on the sensor operation. Two methods of membrane deposition by electropolymerization were compared-at varying potential (cyclic voltammetry) and at constant potential. The cyclic voltammetry was shown to be easier in performing and providing better properties of the membrane...
November 14, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29138110/neuronal-loss-in-the-developing-cerebral-cortex-of-normal-and-bax-deficient-mice-effects-of-ethanol-exposure
#11
Sheena M Britton, Michael W Miller
Fetal alcohol spectrum disorder is associated with defects in neuronal generation, migration, and differentiation. The present study tested the hypothesis that ethanol exposure during the period of naturally occurring neuronal death causes a time- and Bax-dependent neuronal loss. Wild-type and Bax knockout mice were given a pair of injections (two hours apart) of ethanol (2.5 g/kg) or saline on postnatal day (P) 4, P7, P10, or P13. Mean blood ethanol concentration was 435 mg/dl one hour after the second injection...
November 11, 2017: Neuroscience
https://www.readbyqxmd.com/read/29136837/optical-molecular-analysis-using-office-flatbed-photo-scanner-new-approaches-and-solutions
#12
K V Oskolok, E V Shults, O V Monogarova, A A Chaplenko
The design and operations principles of a prototype of optical device based on an office flatbed photo scanner with a slide adapter are described in the paper. The developed device is intended for the analysis of liquid-phase samples by colorimetry, photometry, fluorimetry and nephelometry. Teflon cassettes designed for fixing cuvettes on glass plate of the scanner. Teflon wedge-shaped inserts for cuvettes have been developed to optimize the conditions of colorimetric analysis. These inserts allow varying the thickness of the absorbing layer of solutions...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136475/thru-thickness-vertically-ordered-lamellar-block-copolymer-thin-films-on-unmodified-quartz-with-cold-zone-annealing
#13
Monali N Basutkar, Saumil Samant, Joseph Strzalka, Kevin G Yager, Gurpreet Singh, Alamgir Karim
Template-free directed self-assembly of ultrathin (~10's nm) lamellar block copolymer (l-BCP) films of high-interfacial area into vertically oriented nanodomains holds much technological relevance for fabrication of next-generation devices from nanoelectronics to nanomembranes due to domain interconnectivity and high interfacial area. We report for the first time, the formation of full thru-thickness vertically oriented lamellar domains in 100 nm thin polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) films on quartz substrate, achieved without any PMMA-block wetting layer formation, quartz surface modification (templating chemical, topographical) or system modifications (added surfactant, top-layer coat)...
November 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/29135463/new-method-for-mbe-growth-of-gaas-nanowires-on-silicon-using-colloidal-au-nanoparticles
#14
Alexei Bouravleuv, Igor Ilkiv, Rodion Reznik, Konstantin Kotlyar, Ilya Soshnikov, George Cirlin, Pavel Brunkov, Demid Kirilenko, Leonid V Bondarenko, Aleksandr Nepomnyaschiy, Dimitry V Gruznev, Andrey V Zotov, Alexander Saranin, Veer Dhaka, Harri Lipsanen
We present a new method for the deposition of colloidal Au nanoparticles on the surface of silicon substrates based on short-time Ar plasma treatment without the use of any polymeric layers. The elaborated method is compatible with molecular beam epitaxy, which allowed us to carry out the detailed study of GaAs nanowire synthesis on Si(111) substrates using colloidal Au nanoparticles as seeds for their growth. The results obtained elucidated the causes of the difference between the initial nanoparticle sizes and the diameters of the grown nanowires...
November 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29135220/strong-influence-of-ti-adhesion-layer-on-electron-phonon-relaxation-in-thin-gold-films-ab-initio-nonadiabatic-molecular-dynamics
#15
Xin Zhou, Joanna Jankowska, Linqiu Li, Ashutosh Giri, Patrick E Hopkins, Oleg V Prezhdo
Electron-phonon relaxation in thin metal films is an important consideration for many ultra-small devices and ultra-fast applications. Recent time-resolved experiments demonstrate a significant, more than a factor of five, increase in the electron-phonon coupling and an acceleration in the electron-phonon relaxation rate when a narrow Ti adhesion layer is introduced between an Au film and a non-metal substrate. Using nonadiabatic molecular dynamics combined with real-time time-dependent density functional theory, we identify the reasons that give rise to this strong effect...
November 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29135136/-structural-morphological-changes-of-the-connective-tissue-of-the-vaginal-mucosa-and-perineal-skin-in-women-with-stress-urinary-incontinence
#16
V N Pavlov, A G Yashchuk, A A Kazikhinurov, I I Musin, R M Zauinullina, V A Kulavskii, A A Kazikhinurova
AIM: To investigate the morphological and structural changes in the connective tissue of the vaginal mucosa and perineal skin in women with stress urinary incontinence. MATERIALS AND METHODS: From 2010 to 2013, 71 patients of reproductive age with stress incontinence were observed. The control group comprised 80 women, who also underwent biopsy of the vaginal mucosa and perineal skin. The sections of specimens were stained by Van Gieson, Mallory and Weigert. In immunohistochemical studies, rabbit antibodies specific for collagen types I, III, and IV were placed on each section...
October 2017: Urologii︠a︡
https://www.readbyqxmd.com/read/29134282/aba-and-iaa-control-microsporogenesis-in-petunia-hybrida-l
#17
L V Kovaleva, A S Voronkov, E V Zakharova, I M Andreev
The formation of fertile male gametophyte is known to require timely degeneration of polyfunctional tapetum tissue. The last process caused by the programmed cell death (PCD) is a part of the anther program maturation which leads to sequential anther tissue destruction coordinated with pollen differentiation. In the present work, distribution of abscisic acid (ABA) and indole-3-acetic acid (IAA) in developing anthers of male-fertile and male-sterile lines of petunia (Petunia hybrida L.) was analyzed by using the immunohistochemical method...
November 13, 2017: Protoplasma
https://www.readbyqxmd.com/read/29134220/non-contact-electric-potential-measurements-of-electrode-components-in-an-operating-polymer-electrolyte-fuel-cell-by-near-ambient-pressure-xps
#18
Liwei Yu, Yasumasa Takagi, Takahiro Nakamura, Oki Sekizawa, Tomohiro Sakata, Tomoya Uruga, Mizuki Tada, Yasuhiro Iwasawa, Gabor Samjeské, Toshihiko Yokoyama
Photoelectron spectroscopy has the advantage of providing electric potentials by non-contact measurements based on the kinetic energy shift in component potential. We performed operando hard X-ray photoelectron spectroscopy (HAXPES) measurements with an 8 keV excitation source to measure the shift in electron kinetic energies as a function of the voltages of all the components at the anode and cathode electrodes of a polymer electrolyte fuel cell (PEFC). At the cathode electrode, when we increase the voltage between the cathode and anode from 0...
November 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29133969/treatment-of-chronic-lower-extremity-ulcers-with-a-new-er-yag-laser-technology
#19
J M Alcolea, E Hernández, P A Martínez-Carpio, M Vélez, V Khomchenko, A Sola, M A Trelles
Chronic lower extremity ulcers (CLEUs) have a high prevalence and are difficult to treat due to their various aetiologies. The aim of this study is to evaluate the results achieved in treating CLEUs using an Erbium: YAG (Er:YAG) laser with RecoSMA technology. This laser emits thousands of microbeams of energy causing superficial epidermal ablation and a separation of dermal fibres due to a mechanical-acoustic and resonance effect. The evaluation of the results achieved was carried out by questionnaires completed by 18 patients enrolled in the study...
September 30, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29133177/region-specific-alterations-in-astrocyte-and-microglia-morphology-following-exposure-to-blasts-in-the-mouse-hippocampus
#20
Gloria J DeWalt, Biraaj Mahajan, Andrea R Foster, Lauren D E Thompson, Andrew A Marttini, Eric V Schmidt, Sara Mansuri, Dwayne D'Souza, Shama Patel, Madeline Tenenbaum, Karla I Brandao-Viruet, Dominique Thompson, Bryan Duong, Danica H Smith, Todd A Blute, William D Eldred
Traumatic brain injury (TBI) is a serious public health concern, especially injuries from repetitive insults. The main objective of this study was to immunocytochemically examine morphological alterations in astrocytes and microglia in the hippocampus 48hours following a single blast versus multiple blasts in adult C57BL/6 mice. The effects of ketamine and xylazine (KX), two common anesthetic agents used in TBI research, were also evaluated due to the confounding effect of anesthetics on injury outcome. Results showed a significant increase in hypertrophic microglia that was limited to the outer molecular layer of the dentate gyrus, but only in the absence of KX...
November 10, 2017: Neuroscience Letters
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