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https://www.readbyqxmd.com/read/28102845/h19-let-7-lin28-reciprocal-negative-regulatory-circuit-promotes-breast-cancer-stem-cell-maintenance
#1
Fei Peng, Ting-Ting Li, Kai-Li Wang, Guo-Qing Xiao, Ju-Hong Wang, Hai-Dong Zhao, Zhi-Jie Kang, Wen-Jun Fan, Li-Li Zhu, Mei Li, Bai Cui, Fei-Meng Zheng, Hong-Jiang Wang, Eric W-F Lam, Bo Wang, Jie Xu, Quentin Liu
Long noncoding RNA-H19 (H19), an imprinted oncofetal gene, has a central role in carcinogenesis. Hitherto, the mechanism by which H19 regulates cancer stem cells, remains elusive. Here we show that breast cancer stem cells (BCSCs) express high levels of H19, and ectopic overexpression of H19 significantly promotes breast cancer cell clonogenicity, migration and mammosphere-forming ability. Conversely, silencing of H19 represses these BCSC properties. In concordance, knockdown of H19 markedly inhibits tumor growth and suppresses tumorigenesis in nude mice...
January 19, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28102827/a-low-cost-scalable-current-sensing-digital-headstage-for-high-channel-count-%C3%A2%C2%B5ecog
#2
Michael Trumpis, Michele Insanally, Jialin Zou, Ashraf ElSharif, Ali Ghomashchi, N Sertac Artan, Robert Froemke, Jonathan Viventi
OBJECTIVE: High channel count electrode arrays allow for the monitoring of large-scale neural activity at high spatial resolution. Implantable arrays featuring many recording sites require compact, high bandwidth front-end electronics. In the present study, we investigated the use of a small, light weight, and low cost digital current-sensing integrated circuit for acquiring cortical surface signals from a 61-channel micro-electrocorticographic (��ECoG) array. APPROACH: We recorded both acute and chronic ��ECoG signal from rat auditory cortex using our novel digital current-sensing headstage...
January 19, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28102666/a-simulation-approach-for-timing-analysis-of-genetic-logic-circuits
#3
Hasan Baig, Jan Madsen
Constructing genetic logic circuits is an application of synthetic biology, where parts of the DNA of a living cell are engineered to perform a dedicated Boolean function triggered by appropriate concentration levels of certain proteins or by different genetic components. These logic circuits work in a manner similar to electronic logic circuits, but are much more stochastic and hence much harder to characterize. In this paper, we introduce an approach to analyze the threshold value and timing of genetic logic circuits...
January 19, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28102611/realizing-small-energy-loss-of-0-55-ev-high-open-circuit-voltage-1-v-and-high-efficiency-10-in-fullerene-free-polymer-solar-cells-via-energy-driver
#4
Pei Cheng, Mingyu Zhang, Tsz-Ki Lau, Yao Wu, Boyu Jia, Jiayu Wang, Cenqi Yan, Meng Qin, Xinhui Lu, Xiaowei Zhan
A new, easy, and efficient approach is reported to enhance the driving force for charge transfer, break tradeoff between open-circuit voltage and short-circuit current, and simultaneously achieve very small energy loss (0.55 eV), very high open-circuit voltage (>1 V), and very high efficiency (>10%) in fullerene-free organic solar cells via an energy driver.
January 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28102397/highly-exposed-fe-n4-active-sites-in-porous-poly-iron-phthalocyanine-based-oxygen-reduction-electrocatalyst-with-ultrahigh-performance-for-air-cathode
#5
Ganesan Anandhababu, Syed Comail Abbas, Jiangquan Lv, Kui Ding, Qin Liu, Dickson D Babu, Yiyin Huang, Jiafang Xie, Maoxiang Wu, Yaobing Wang
Progress in the development of efficient electrocatalysts for oxygen reduction reactions is imperative for various energy systems such as metal-air batteries and fuel cells. In this paper, an innovative porous two-dimensional (2D) poly-iron-phthalocyanine (PFe-Pc) based oxygen reduction electrocatalyst created with a simple solid-state chemical reaction without pyrolysis is reported. In this strategy, silicon dioxide nanoparticles play a pivotal role in preserving the Fe-N4 structure during the polymerization process and thereby assist in the development of a porous structure...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28102320/polarization-conversion-in-plasmonic-nanoantennas-for-metasurfaces-using-structural-asymmetry-and-mode-hybridization
#6
Peter R Wiecha, Leo-Jay Black, Yudong Wang, Vincent Paillard, Christian Girard, Otto L Muskens, Arnaud Arbouet
Polarization control using single plasmonic nanoantennas is of interest for subwavelength optical components in nano-optical circuits and metasurfaces. Here, we investigate the role of two mechanisms for polarization conversion by plasmonic antennas: Structural asymmetry and plasmon hybridization through strong coupling. As a model system we investigate L-shaped antennas consisting of two orthogonal nanorods which lengths and coupling strength can be independently controlled. An analytical model based on field susceptibilities is developed to extract key parameters and to address the influence of antenna morphology and excitation wavelength on polarization conversion efficiency and scattering intensities...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102289/corrigendum-light-matter-decoupling-and-a-2-term-detection-in-superconducting-circuits
#7
J J García-Ripoll, B Peropadre, S De Liberato
No abstract text is available yet for this article.
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28100828/an-integrated-modelling-framework-for-neural-circuits-with-multiple-neuromodulators
#8
Alok Joshi, Vahab Youssofzadeh, Vinith Vemana, T M McGinnity, Girijesh Prasad, KongFatt Wong-Lin
Neuromodulators are endogenous neurochemicals that regulate biophysical and biochemical processes, which control brain function and behaviour, and are often the targets of neuropharmacological drugs. Neuromodulator effects are generally complex partly owing to the involvement of broad innervation, co-release of neuromodulators, complex intra- and extrasynaptic mechanism, existence of multiple receptor subtypes and high interconnectivity within the brain. In this work, we propose an efficient yet sufficiently realistic computational neural modelling framework to study some of these complex behaviours...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28100747/selective-deletion-of-sodium-salt-taste-during-development-leads-to-expanded-terminal-fields-of-gustatory-nerves-in-the-adult-mouse-nucleus-of-the-solitary-tract
#9
Chengsan Sun, Edith Hummler, David L Hill
: Neuronal activity plays a key role in the development of sensory circuits in the mammalian brain. In the gustatory system, experimental manipulations now exist, through genetic manipulations of specific taste transduction processes, to examine how specific taste qualities (i.e., basic tastes) impact the functional and structural development of gustatory circuits. Here, we used a mouse knock-out model in which the transduction component used to discriminate sodium salts from other taste stimuli was deleted in taste bud cells throughout development...
January 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28100743/three-small-receptive-field-ganglion-cells-in-the-mouse-retina-are-distinctly-tuned-to-size-speed-and-object-motion
#10
Jason Jacoby, Gregory W Schwartz
: Retinal ganglion cells (RGCs) are frequently divided into functional types by their ability to extract and relay specific features from a visual scene, such as the capacity to discern local or global motion, direction of motion, stimulus orientation, contrast or uniformity, or the presence of large or small objects. Here we introduce three previously uncharacterized, nondirection-selective ON-OFF RGC types that represent a distinct set of feature detectors in the mouse retina. The three high-definition (HD) RGCs possess small receptive-field centers and strong surround suppression...
January 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28100741/control-of-spike-transfer-at-hippocampal-mossy-fiber-synapses-in-vivo-by-gabaa-and-gabab-receptor-mediated-inhibition
#11
Stefano Zucca, Marilena Griguoli, Meryl Malézieux, Noëlle Grosjean, Mario Carta, Christophe Mulle
: Despite extensive studies in hippocampal slices and incentive from computational theories, the synaptic mechanisms underlying information transfer at mossy fiber (mf) connections between the dentate gyrus (DG) and CA3 neurons in vivo are still elusive. Here we used an optogenetic approach in mice to selectively target and control the activity of DG granule cells (GCs) while performing whole-cell and juxtacellular recordings of CA3 neurons in vivo In CA3 pyramidal cells (PCs), mf-CA3 synaptic responses consisted predominantly of an IPSP at low stimulation frequency (0...
January 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28099850/synaptotagmin-2-is-the-fast-ca-2-sensor-at-a-central-inhibitory-synapse
#12
Chong Chen, Itaru Arai, Rachel Satterfield, Samuel M Young, Peter Jonas
GABAergic synapses in brain circuits generate inhibitory output signals with submillisecond latency and temporal precision. Whether the molecular identity of the release sensor contributes to these signaling properties remains unclear. Here, we examined the Ca(2+) sensor of exocytosis at GABAergic basket cell (BC) to Purkinje cell (PC) synapses in cerebellum. Immunolabeling suggested that BC terminals selectively expressed synaptotagmin 2 (Syt2), whereas synaptotagmin 1 (Syt1) was enriched in excitatory terminals...
January 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/28099418/il-17-is-a-neuromodulator-of-caenorhabditis-elegans-sensory-responses
#13
Changchun Chen, Eisuke Itakura, Geoffrey M Nelson, Ming Sheng, Patrick Laurent, Lorenz A Fenk, Rebecca A Butcher, Ramanujan S Hegde, Mario de Bono
Interleukin-17 (IL-17) is a major pro-inflammatory cytokine: it mediates responses to pathogens or tissue damage, and drives autoimmune diseases. Little is known about its role in the nervous system. Here we show that IL-17 has neuromodulator-like properties in Caenorhabditis elegans. IL-17 can act directly on neurons to alter their response properties and contribution to behaviour. Using unbiased genetic screens, we delineate an IL-17 signalling pathway and show that it acts in the RMG hub interneurons. Disrupting IL-17 signalling reduces RMG responsiveness to input from oxygen sensors, and renders sustained escape from 21% oxygen transient and contingent on additional stimuli...
January 18, 2017: Nature
https://www.readbyqxmd.com/read/28098970/strong-enhancement-of-photoelectric-conversion-efficiency-of-co-hybridized-polymer-solar-cell-by-silver-nanoplates-and-core-shell-nanoparticles
#14
Wenfei Shen, Jianguo Tang, Yao Wang, Jixian Liu, Linjun Huang, Weichao Chen, Lanlan Yang, Wei Wang, Yanxin Wang, Renqiang Yang, Jungheum Yun, Laurence A Belfiore
A new way was meticulously designed to utilize the localized surface plasmon resonance (LSPR) effect and the light scattering effect of silver nanoplate (Ag-nPl) and core-shell Ag@SiO2 nanoparticles (Ag@SiO2-NPs) to enhance the photovoltaic performances of polymer solar cells (PSCs). To prevent direct contact between silver nanoparticles (Ag-NPs) and photo-active materials which will cause electrons quenching, bare Ag-nPl were spin-coated on indium tin oxide and silica capsulated Ag-NPs were incorporated to PBDTTT-C-T:PC71BM active layer...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28098500/exploring-black-college-females-perceptions-regarding-hiv-prevention-message-content
#15
Rasheeta Chandler-Coley, Henry Ross, Oluwatobi Ozoya, Celia Lescano, Timothy Flannigan
Media messages can facilitate the delivery of accurate information related to HIV and sexually transmitted infection. This study's purpose was to examine preexisting media campaigns from the iMPPACS study to assess age-, gender-, and culturally appropriate components identified by African American females who attend historically Black colleges/universities. In 3 separate focus group sessions, 31 Black female college students (M age = 20) viewed 4 vignettes and heard 3 audio-only clips, then ranked and commented on them based on perceived satisfaction with HIV prevention content and appropriateness of delivery...
January 18, 2017: Journal of Health Communication
https://www.readbyqxmd.com/read/28098258/unidirectional-invisibility-induced-by-parity-time-symmetric-circuit
#16
Bo Lv, Jiahui Fu, Bian Wu, Rujiang Li, Qingsheng Zeng, Xinhua Yin, Qun Wu, Lei Gao, Wan Chen, Zhefei Wang, Zhiming Liang, Ao Li, Ruyu Ma
Parity-time (PT) symmetric structures present the unidirectional invisibility at the spontaneous PT-symmetry breaking point. In this paper, we propose a PT-symmetric circuit consisting of a resistor and a microwave tunnel diode (TD) which represent the attenuation and amplification, respectively. Based on the scattering matrix method, the circuit can exhibit an ideal unidirectional performance at the spontaneous PT-symmetry breaking point by tuning the transmission lines between the lumped elements. Additionally, the resistance of the reactance component can alter the bandwidth of the unidirectional invisibility flexibly...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28098250/tailoring-femtosecond-1-5-%C3%AE-m-bessel-beams-for-manufacturing-high-aspect-ratio-through-silicon-vias
#17
Fei He, Junjie Yu, Yuanxin Tan, Wei Chu, Changhe Zhou, Ya Cheng, Koji Sugioka
Three-dimensional integrated circuits (3D ICs) are an attractive replacement for conventional 2D ICs as high-performance, low-power-consumption, and small-footprint microelectronic devices. However, one of the major remaining challenges is the manufacture of high-aspect-ratio through-silicon vias (TSVs), which is a crucial technology for the assembly of 3D Si ICs. Here, we present the fabrication of high-quality TSVs using a femtosecond (fs) 1.5-μm Bessel beam. To eliminate the severe ablation caused by the sidelobes of a conventional Bessel beam, a fs Bessel beam is tailored using a specially designed binary phase plate...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28098184/infrared-laser-induced-gene-expression-for-tracking-development-and-function-of-single-c-elegans-embryonic-neurons
#18
Anupriya Singhal, Shai Shaham
Visualizing neural-circuit assembly in vivo requires tracking growth of optically resolvable neurites. The Caenorhabditis elegans embryonic nervous system, comprising 222 neurons and 56 glia, is attractive for comprehensive studies of development; however, embryonic reporters are broadly expressed, making single-neurite tracking/manipulation challenging. We present a method, using an infrared laser, for reproducible heat-dependent gene expression in small sublineages (one to four cells) without radiation damage...
January 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28097947/evaluating-waste-printed-circuit-boards-recycling-opportunities-and-challenges-a-mini-review
#19
Abhishek Kumar Awasthi, Gabriel Ionut Zlamparet, Xianlai Zeng, Jinhui Li
Rapid generation of waste printed circuit boards has become a very serious issue worldwide. Numerous techniques have been developed in the last decade to resolve the pollution from waste printed circuit boards, and also recover valuable metals from the waste printed circuit boards stream on a large-scale. However, these techniques have their own certain specific drawbacks that need to be rectified properly. In this review article, these recycling technologies are evaluated based on a strength, weaknesses, opportunities and threats analysis...
January 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28097729/the-role-of-orexin-signaling-in-the-ventral-tegmental-area-and-central-amygdala-in-modulating-binge-like-ethanol-drinking-behavior
#20
Jeffrey J Olney, Montserrat Navarro, Todd E Thiele
BACKGROUND: Recent reports have demonstrated that binge-like ethanol drinking leads to an increase in hypothalamic orexin (OX) signaling and that suppressing this signaling via systemic administration of an orexin receptor (OXR) antagonist blocks this behavior; however, the specific OX pathways that modulate this behavior remain unknown. The goal of the present study was to further elucidate the role of the OX system in binge-like ethanol drinking using behavioral, molecular, and pharmacological techniques...
January 17, 2017: Alcoholism, Clinical and Experimental Research
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