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https://www.readbyqxmd.com/read/28888402/investigating-the-potential-of-multiwalled-carbon-nanotubes-based-zinc-nanocomposite-as-a-recognition-interface-towards-plant-pathogen-detection
#1
Muhammad Ali Tahir, Sadaf Hameed, Anam Munawar, Imran Amin, Shahid Mansoor, Waheed S Khan, Sadia Zafar Bajwa
The emergence of nanotechnology has opened new horizons for constructing efficient recognition interfaces. This is the first report where the potential of a multiwalled carbon nanotube based zinc nanocomposite (MWCNTs-Zn NPs) investigated for the detection of an agricultural pathogen i.e. Chili leaf curl betasatellite (ChLCB). Atomic force microscope analyses revealed the presence of multiwalled carbon nanotubes (MWCNTs) having a diameter of 50-100nm with zinc nanoparticles (Zn-NPs) of 25-500nm. In this system, these bunches of Zn-NPs anchored along the whole lengths of MWCNTs were used for the immobilization of probe DNA strands...
September 6, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28884573/cornlike-ordered-mesoporous-silicon-particles-modified-by-nitrogen-doped-carbon-layer-for-the-application-of-li-ion-battery
#2
Bing Lu, Bingjie Ma, Xinglan Deng, Wangwu Li, Zhenyu Wu, Hongbo Shu, Xianyou Wang
The cornlike ordered mesoporous silicon (OM-Si) particles modified by the nitrogen-doped carbon layer (OM-Si@NC) are successfully fabricated and used as the anode of lithium-ion battery (LIBs). The influences of the N-doped carbon layer on the structure and electrochemical properties of the OM-Si@NC composite are detailedly investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectroscopy (XPS), and charge/discharge tests. The results reveal that the amorphous N-doped carbon layer can offer the abundant conductive pathways for fast lithium ion transportation and electron transfer, which not only leads to a high specific capacity under high ampere density but also serves as a structural barrier maintaining the whole integrity and settling the mechanical breaking due to the huge volume changes of Si host...
September 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28877098/a-3-dimensional-printed-ultrasound-probe-visuospatial-trainer
#3
Ryan T McKenna, Jesse C Dove, Robert A Ratzlaff, Jose L Diaz-Gomez, Daniel J Cox, Leslie V Simon
Training adult learners to use ultrasound in clinical practice relies on the ability of the learner to apply visuospatial concepts to the anatomy of the human body. We describe a visuospatial trainer that replicates the housing of an ultrasound transducer, through which a linear laser projects light in the same plane and orientation as the ultrasonic sound waves. We use this trainer in combination with a porcine heart dissection laboratory to teach bedside cardiac ultrasound and transthoracic echocardiography (TTE)...
September 4, 2017: Ultrasound Quarterly
https://www.readbyqxmd.com/read/28764513/note-diagnostic-deuterium-beam-with-an-ultra-small-energy-spread-for-plasma-spectroscopy
#4
V Ya Savkin, A A Lizunov
The DINA-5M diagnostic atomic beam has been upgraded to reduce the energy spread down to 50 eV. An active voltage stabilization system introduces a chain of varistors connected in series that can be switched with the time constant of 70 μs to minimize the deviation from the reference to the high-voltage level. Using deuterium, the enhanced diagnostic beam has the current of four atomic amperes and the energy of 50 keV ± 50 eV. The primary considered application is a motional Stark effect diagnostic combined with laser-induced fluorescence, where the beam energy spread is an ultimate parameter determining the measurement performance...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28615472/neuronal-circadian-clock-protein-oscillations-are-similar-in-behaviourally-rhythmic-forager-honeybees-and-in-arrhythmic-nurses
#5
T Fuchikawa, K Beer, C Linke-Winnebeck, R Ben-David, A Kotowoy, V W K Tsang, G R Warman, E C Winnebeck, C Helfrich-Förster, G Bloch
Internal clocks driving rhythms of about a day (circadian) are ubiquitous in animals, allowing them to anticipate environmental changes. Genetic or environmental disturbances to circadian clocks or the rhythms they produce are commonly associated with illness, compromised performance or reduced survival. Nevertheless, some animals including Arctic mammals, open sea fish and social insects such as honeybees are active around-the-clock with no apparent ill effects. The mechanisms allowing this remarkable natural plasticity are unknown...
June 2017: Open Biology
https://www.readbyqxmd.com/read/28595038/bio-electric-field-enhancement-the-influence-on-hyaluronan-mediated-motility-receptors-in-human-breast-carcinoma
#6
Marcy C Purnell
Mechanisms that regulate cancer cell metastasis are often intricately linked to mechanisms that control cell migration in wound repair. Hyaluronan Mediated Motility Receptor (HMMR) encodes a receptor for hyaluronan-mediated motility (RHAMM), a non-integral cell surface hyaluronan receptor and intracellular protein that promotes mitotic spindle formation and cell motility. RHAMM has been found to have increased expression in both cancers and wounds, and when cancers show increased RHAMM expression poor outcomes have occurred...
April 2017: Discovery Medicine
https://www.readbyqxmd.com/read/28593211/architecture-of-conx-single-clusters-on-nanocarbon-as-excellent-oxygen-reduction-catalysts-with-high-efficient-atomic-utilization
#7
Ting He, Hui Xue, Xiaojuan Wang, Shuanghua He, Yulai Lei, Yuyuan Zhang, Rujuan Shen, Yi Zhang, Juan Xiang
A new strategy to fabricate CoNx single cluster supported nanocarbon catalysts (C/P/2Co600) with enhanced atomic utilization towards the oxygen reduction reaction (ORR) is reported. N-Coordination protection and low-temperature pyrolysis are the two key factors for the formation of CoNx single clusters on nanocarbon supports. Morphological and structural identification confirmed the simultaneous anchoring of homo-dispersed CoNx single clusters and N-doping on the nanocarbon under relatively mild thermal treatment conditions...
June 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28190940/lipschitz-estimates-for-commutators-of-singular-integral-operators-associated-with-the-sections
#8
Guangqing Wang, Jiang Zhou
Let H be Monge-Ampère singular integral operator, [Formula: see text], and [Formula: see text]. It is proved that the commutator [Formula: see text] is bounded from [Formula: see text] to [Formula: see text] for [Formula: see text] and from [Formula: see text] to [Formula: see text] for [Formula: see text]. For the extreme case [Formula: see text], a weak estimate is given.
2017: Journal of Inequalities and Applications
https://www.readbyqxmd.com/read/28105928/computer-aided-identification-of-a-hevein-like-antimicrobial-peptide-of-bell-pepper-leaves-for-biotechnological-use
#9
Patrícia Dias Games, Elói Quintas Gonçalves daSilva, Meire de Oliveira Barbosa, Hebréia Oliveira Almeida-Souza, Patrícia Pereira Fontes, Marcos Jorge deMagalhães, Paulo Roberto Gomes Pereira, Maura Vianna Prates, Gloria Regina Franco, Alessandra Faria-Campos, Sérgio Vale Aguiar Campos, Maria Cristina Baracat-Pereira
BACKGROUND: Antimicrobial peptides from plants present mechanisms of action that are different from those of conventional defense agents. They are under-explored but have a potential as commercial antimicrobials. Bell pepper leaves ('Magali R') are discarded after harvesting the fruit and are sources of bioactive peptides. This work reports the isolation by peptidomics tools, and the identification and partially characterization by computational tools of an antimicrobial peptide from bell pepper leaves, and evidences the usefulness of records and the in silico analysis for the study of plant peptides aiming biotechnological uses...
December 15, 2016: BMC Genomics
https://www.readbyqxmd.com/read/28094940/high-electronic-conductance-through-double-helix-dna-molecules-with-fullerene-anchoring-groups
#10
Kathia L Jiménez-Monroy, Nicolas Renaud, Jeroen Drijkoningen, David Cortens, Koen Schouteden, Christian van Haesendonck, Wanda J Guedens, Jean V Manca, Laurens D A Siebbeles, Ferdinand C Grozema, Patrick H Wagner
Determining the mechanism of charge transport through native DNA remains a challenge as different factors such as measuring conditions, molecule conformations, and choice of technique can significantly affect the final results. In this contribution, we have used a new approach to measure current flowing through isolated double-stranded DNA molecules, using fullerene groups to anchor the DNA to a gold substrate. Measurements were performed at room temperature in an inert environment using a conductive AFM technique...
February 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28047180/we-ab-204-03-increasing-access-to-medical-physics-education-and-research-excellence-ampere
#11
W Ngwa
Many efforts have been made to increase diversity in the science workforce. In order for us to be competitive in innovation and ingenuity we need to reach out to any source of intellectual talent. Having greater diversity can only increase the creativity in medical physics. In order for students to succeed academically they need role models and mentors with whom they can identify. Literature has shown that racial and ethnic diversity has both direct and indirect positive effects on the educational outcomes, career advancement and motivation of students...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28009968/the-dielectrophoretic-disassociation-of-chloride-ions-and-the-influence-on-diamagnetic-anisotropy-in-cell-membranes
#12
Marcy C Purnell, Terence J Skrinjar
Chloride channels represent ubiquitously expressed proteins that regulate fundamental cellular processes including membrane potential, maintenance of intracellular pH, and regulation of cell volume. However, mechanisms to modulate this large family of ion channels have remained elusive to date. This large chloride channel family does not appear to operate with selectivity similar to the sodium and potassium channels. These unique channels appear to be bi-directional cotransporters of two or more different molecules or ions across a bilayer phospholipid membrane...
November 2016: Discovery Medicine
https://www.readbyqxmd.com/read/27980207/biaxially-strained-ptpb-pt-core-shell-nanoplate-boosts-oxygen-reduction-catalysis
#13
Lingzheng Bu, Nan Zhang, Shaojun Guo, Xu Zhang, Jing Li, Jianlin Yao, Tao Wu, Gang Lu, Jing-Yuan Ma, Dong Su, Xiaoqing Huang
Compressive surface strains have been necessary to boost oxygen reduction reaction (ORR) activity in core/shell M/platinum (Pt) catalysts (where M can be nickel, cobalt, or iron). We report on a class of platinum-lead/platinum (PtPb/Pt) core/shell nanoplate catalysts that exhibit large biaxial strains. The stable Pt (110) facets of the nanoplates have high ORR specific and mass activities that reach 7.8 milliampere (mA) per centimeter squared and 4.3 ampere per milligram of platinum at 0.9 volts versus the reversible hydrogen electrode (RHE), respectively...
December 16, 2016: Science
https://www.readbyqxmd.com/read/27869213/highly-efficient-spin-current-operation-in-a-cu-nano-ring
#14
Benedict A Murphy, Andrew J Vick, Marjan Samiepour, Atsufumi Hirohata
An all-metal lateral spin-valve structure has been fabricated with a medial Copper nano-ring to split the diffusive spin-current path. We have demonstrated significant modulation of the non-local signal by the application of a magnetic field gradient across the nano-ring, which is up to 30% more efficient than the conventional Hanle configuration at room temperature. This was achieved by passing a dc current through a current-carrying bar to provide a locally induced Ampère field. We have shown that in this manner a lateral spin-valve gains an additional functionality in the form of three-terminal gate operation for future spintronic logic...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27856847/ultrafine-jagged-platinum-nanowires-enable-ultrahigh-mass-activity-for-the-oxygen-reduction-reaction
#15
Mufan Li, Zipeng Zhao, Tao Cheng, Alessandro Fortunelli, Chih-Yen Chen, Rong Yu, Qinghua Zhang, Lin Gu, Boris V Merinov, Zhaoyang Lin, Enbo Zhu, Ted Yu, Qingying Jia, Jinghua Guo, Liang Zhang, William A Goddard, Yu Huang, Xiangfeng Duan
Improving the platinum (Pt) mass activity for the oxygen reduction reaction (ORR) requires optimization of both the specific activity and the electrochemically active surface area (ECSA). We found that solution-synthesized Pt/NiO core/shell nanowires can be converted into PtNi alloy nanowires through a thermal annealing process and then transformed into jagged Pt nanowires via electrochemical dealloying. The jagged nanowires exhibit an ECSA of 118 square meters per gram of Pt and a specific activity of 11.5 milliamperes per square centimeter for ORR (at 0...
December 16, 2016: Science
https://www.readbyqxmd.com/read/27833119/streaming-current-magnetic-fields-in-a-charged-nanopore
#16
Abraham Mansouri, Peyman Taheri, Larry W Kostiuk
Magnetic fields induced by currents created in pressure driven flows inside a solid-state charged nanopore were modeled by numerically solving a system of steady state continuum partial differential equations, i.e., Poisson, Nernst-Planck, Ampere and Navier-Stokes equations (PNPANS). This analysis was based on non-dimensional transport governing equations that were scaled using Debye length as the characteristic length scale, and applied to a finite length cylindrical nano-channel. The comparison of numerical and analytical studies shows an excellent agreement and verified the magnetic fields density both inside and outside the nanopore...
November 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27821861/three-waveform-bidirectional-pumping-of-single-electrons-with-a-silicon-quantum-dot
#17
Tuomo Tanttu, Alessandro Rossi, Kuan Yen Tan, Akseli Mäkinen, Kok Wai Chan, Andrew S Dzurak, Mikko Möttönen
Semiconductor-based quantum dot single-electron pumps are currently the most promising candidates for the direct realization of the emerging quantum standard of the ampere in the International System of Units. Here, we discuss a silicon quantum dot single-electron pump with radio frequency control over the transparencies of entrance and exit barriers as well as the dot potential. We show that our driving protocol leads to robust bidirectional pumping: one can conveniently reverse the direction of the quantized current by changing only the phase shift of one driving waveform with respect to the others...
November 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27746636/investigating-effects-of-nano-to-micro-ampere-alternating-current-stimulation-on-trichophyton-rubrum-growth
#18
Dong Rak Kwon, Hyunjung Kwon, Woo Ram Lee, Joonsoo Park
BACKGROUND: Fungi are eukaryotic microorganisms including yeast and molds. Many studies have focused on modifying bacterial growth, but few on fungal growth. Microcurrent electricity may stimulate fungal growth. OBJECTIVE: This study aims to investigate effects of microcurrent electric stimulation on Trichophyton rubrum growth. METHODS: Standard-sized inoculums of T. rubrum derived from a spore suspension were applied to potato dextrose cornmeal agar (PDACC) plates, gently withdrawn with a sterile pipette, and were applied to twelve PDACC plates with a sterile spreader...
October 2016: Annals of Dermatology
https://www.readbyqxmd.com/read/27698358/in-vivo-imaging-of-magnetic-fields-induced-by-transcranial-direct-current-stimulation-tdcs-in-human-brain-using-mri
#19
Mayank V Jog, Robert X Smith, Kay Jann, Walter Dunn, Belen Lafon, Dennis Truong, Allan Wu, Lucas Parra, Marom Bikson, Danny J J Wang
Transcranial direct current stimulation (tDCS) is an emerging non-invasive neuromodulation technique that applies mA currents at the scalp to modulate cortical excitability. Here, we present a novel magnetic resonance imaging (MRI) technique, which detects magnetic fields induced by tDCS currents. This technique is based on Ampere's law and exploits the linear relationship between direct current and induced magnetic fields. Following validation on a phantom with a known path of electric current and induced magnetic field, the proposed MRI technique was applied to a human limb (to demonstrate in-vivo feasibility using simple biological tissue) and human heads (to demonstrate feasibility in standard tDCS applications)...
October 4, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27676380/low-noise-patch-clamp-current-amplification-by-nanoparticles-plasmonic-photonic-coupling-analysis-and-modelling
#20
E O Haberal, A SalmanOgli, B Nasseri
In this article, a patch-clamp low noise current amplification based on nanoparticles plasmonic radiation is analyzed. It is well-known, a very small current is flowing from different membrane channels and so, for extra processing the current amplification is necessary. It is notable that there are some problems in traditional electronic amplifier due to its noise and bandwidth problem. Because of the important role of the patch-clamp current in cancer research and especially its small amplitude, it is vital to intensify it without adding any noises...
October 2016: IET Nanobiotechnology
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