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https://www.readbyqxmd.com/read/28535055/ionic-liquid-anion-controlled-nanoscale-gold-morphology-grown-at-a-liquid-interface
#1
Nakara Bhawawet, Jeremy B Essner, Durgesh Vinod Wagle, Gary A Baker
Two different ionic liquids comprising the tetrabutylphosphonium cation ([P4444]) paired with the strongly-coordinating anions 6-aminocaproate ([6-AC]) or taurinate ([tau]) were prepared and employed in an aqueous/organic liquid bilayer system to generate nanoscale gold by Au(OH)4- photoreduction. Generally, as the concentration of ionic liquid in the organic phase was increased, the resulting quasi-spherical gold nanoparticles reduced in size and presented less aggregation, leading to marked increases in the catalytic efficiency for 4-nitrophenol reduction using borohydride...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28535031/tunichrome-inspired-gold-enrichment-dispersion-matrix-and-its-application-in-water-treatment-a-proof-of-concept-investigation
#2
Amarendra Dhar Dwivedi, Rega Permana, Jitendra Pal Singh, Hakwon Yoon, Keun Hwa Chae, Yoon-Seok Chang, Dong Soo Hwang
Tunicate, a filter-feeder in seawater, is able to accumulate high amount of metals using intracellular polymer matrices. The woven pyrogallol structures of tunichrome, a small peptide contained in tunicate's blood cells, is believed to be responsible for selective metal sequestration in tunicates from seawater. However, the intriguing tunichrome matrix is difficult to harvest from the tunicate nor to synthesize massively due to the extreme oxidation sensitivity of the pyrogallol moiety which limits the study scope...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534897/seed-mediated-co-reduction-in-a-large-lattice-mismatch-system-synthesis-of-pd-cu-nanostructures
#3
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/28534609/au-promoted-nickel-iron-layered-double-hydroxide-nanoarrays-a-modular-catalyst-enabling-high-performance-oxygen-evolution
#4
Wenxin Zhu, Lizhi Liu, Zhihao Yue, Wentao Zhang, Xiaoyue Yue, Jing Wang, Shaoxuan Yu, Li Wang, Jianlong Wang
Oxygen evolution reaction (OER) has played a pivotal role in many energy conversion and storage technologies like water electrolysis, fuel cells, and metal-air batteries. However, the slow kinetics of OER limit the performance and commercialization of such devices. Herein, we report on NiFe LDH@Au hybrid nanoarrays on Ni foam for much enhanced OER. By hybridization of electronegative Au and NiFe LDH with intrinsic remarkable OER catalytic activity, this modular electrode could drive an overall ultrahigh-performance and robust OER in base with the demand of overpotentials of only 221, 235 and 270 mV to afford 50, 100 and 500 mA cm-2, respectively...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28533689/medication-related-costs-of-rhinitis-in-australia-a-nostradata-cross-sectional-study-of-pharmacy-purchases
#5
Pete Smith, David Price, Richard Harvey, Andrew Simon Carney, Vicky Kritikos, Sinthia Z Bosnic-Anticevich, Louise Christian, Derek Skinner, Victoria Carter, Alice Marie Sybille Durieux
PURPOSE: There is a relative paucity of research regarding medication expenditure associated with multiple-therapy use for rhinitis in Australia. To describe 1) the nature and extent of multiple-therapy use for rhinitis in Australia using data on therapies purchased with prescription or over-the-counter (OTC) and 2) additional costs incurred by multiple-therapy use compared with intranasal corticosteroid (INCS) therapy alone. PATIENTS AND METHODS: A retrospective observational study was carried out using a database containing anonymous pharmacy transaction data available from 20% of pharmacies in Australia that links doctor prescriptions and OTC purchase information...
2017: Journal of Asthma and Allergy
https://www.readbyqxmd.com/read/28532996/histone-methyltransferase-g9a-promotes-liver-cancer-development-by-epigenetic-silencing-of-tumor-suppressor-gene-rarres3
#6
Lai Wei, David Kung-Chun Chiu, Felice Ho-Ching Tsang, Dicky Cheuk-Ting Law, Carol Lai-Hung Cheng, Sandy Leung-Kuen Au, Joyce Man-Fong Lee, Carmen Chak-Lui Wong, Irene Oi-Lin Ng, Chun-Ming Wong
BACKGROUND AND AIMS: Hepatocellular carcinoma (HCC) is a major leading cause of cancer mortality worldwide. Epigenetic deregulation is a common trait of human HCC. G9s is an important epigenetics regulator. However, its roles in liver carcinogenesis remain to be investigated. METHODS: Gene expressions were determined by RNA-Seq and qRT-PCR. G9a knockdown and knockout cell lines were established by lentiviral-based shRNA and CRISPR/Cas9 gene editing system. Tumor promoting functions of G9a was studied by both in HCC cell lines and nude mice model...
May 19, 2017: Journal of Hepatology
https://www.readbyqxmd.com/read/28531970/ultrasensitive-cholesterol-biosensor-based-on-enzymatic-silver-deposition-on-gold-nanoparticles-modified-screen-printed-carbon-electrode
#7
Yong Huang, Lijie Cui, Yewei Xue, Songbai Zhang, Nixuan Zhu, Jintao Liang, Guiyin Li
Cholesterol is one of the essential structural constituents of cell membranes. Determination of cholesterol is of great importance in clinical analysis because the level of cholesterol in serum is an indicator in the diagnosis and prevention of heart diseases. In this work, a simple and ultrasensitive cholesterol biosensor based on enzymatic silver deposition was designed by immobilizing cholesterol oxidase (CHOD) and cholesterol esterase (CHER) onto the surface of gold nanoparticles (Au NPs) modified screen-printed carbon electrode (SPE)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531651/synthesis-and-characterization-of-au-nps-supported-on-carbon-nanotubes-application-for-the-ultrasound-assisted-removal-of-radioactive-uo2-2-ions-following-complexation-with-arsenazo-iii-spectrophotometric-detection-optimization-isotherm-and-kinetic-study
#8
Mohammad Hassan Omidi, Farshid Nasiri Azad, Mehrorang Ghaedi, Arash Asfaram, Mohammad Hossein Ahmadi Azqhandi, Lobat Tayebi
The present study devoted to description of efficient removal of radioactive UO2(2+) ions (U(IV)) via complexation with Arsenazo III (ARS III) accelerated by ultrasound-assisted adsorption onto the Au-NPs supported on carbon nanotubes (Au-NPs-CNTs), which were characterized by conventional techniques such as FESEM, EDS and XRD. Central composite design (CCD) employed to model contribution of parameters viz. pH (2.5-8.5), adsorbent mass (5-25mg), UO2(2+) concentration (5-25mgL(-1)) and sonication time (1-5min) onto response...
May 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28531351/pharmaceutical-intermediate-modified-gold-nanoparticles-against-multidrug-resistant-bacteria-and-wound-healing-application-via-electrospun-scaffold
#9
Xinglong Yang, Junchuan Yang, Le Wang, Bei Ran, Yuexiao Jia, Lingmin Zhang, Guang Yang, Huawu Shao, Xingyu Jiang
Remedying multidrug-resistant (MDR) bacteria wound infection is major challenge due to the inability of conventional antibiotics in treating such infections against MDR bacteria. Thus, developing wound dressings for wound care, particularly against MDR bacteria, is in huge demand. Here, we present a strategy in designing wound dressings: we use a small molecule (6-aminopenicillanic acid, APA)-coated gold nanoparticles (AuNPs) to inhibit MDR bacteria. We dope the AuNPs into electrospun fibers of poly(ε-caprolactone) (PCL)/gelatin to yield materials that guard against wound infection by MDR bacteria...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28531349/low-temperature-pm-irras-of-a-monolayer-on-au-peculiarities-in-the-spectra-of-c18d37sh
#10
Milan Mašát, Jin Wen, Zdenek Sofer, Josef Michl
We describe an experimental setup suitable for the measurement of photomodulated IR reflection/absorption spectra of monolayers on a flat gold substrate at temperatures from room to 14 K. Results obtained for a monolayer of C18D37SH on gold are shown and compared with IR spectra of C18D37SH in a KBr pellet at these temperatures. Band widths are reduced by only about 10%, but upon cooling below 100 - 150 K, the frequencies and intensities of νas(CD3) and νas(CD2) bands in the C-D stretching region in both types of spectra undergo dramatic reversible changes of unknown origin...
May 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28531347/stacked-gold-nanodisks-for-bimodal-photoacoustic-and-optical-coherence-imaging
#11
Jung-Sub Wi, Jisoo Park, Heesung Kang, Donggeun Jung, Sang-Won Lee, Tae Geol Lee
Herein, we report on biological imaging nanoprobes: physically-synthesized gold nanodisks that have inherent optical advantages-a wide range of resonant wavelengths, tunable ratio of light absorption-to-scattering, and responsiveness to random incident light-due to their two-dimensional circular nanostructure. Based on our proposed physical synthesis where gold is vacuum-deposited onto a pre-patterned polymer template and released from the substrate in the form of a nanodisk, monodisperse two-dimensional gold nanodisks were prepared with independent control of their diameter and thickness...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28531089/au-nanoparticle-decorated-silicon-pyramids-for-plasmon-enhanced-hot-electron-near-infrared-photodetection
#12
Zhiyang Qi, Yusheng Zhai, Long Wen, Qilong Wang, Qin Chen, Sami Iqbal, Guangdian Chen, Ji Xu, Yan Tu
Heterojunction between metal and silicon (Si) is an attractive route to extend the response of Si-based photodiodes into the near-infrared (NIR) region, so-called Schottky barrier diodes. Photons absorbed into a metallic nanostructure excite the surface plasmon resonances (SPRs), which can be damped non-radiatively through the creation of hot electrons. Unfortunately, quantum efficiency of hot electron detectors remains low due to low optical absorption and poor electron injection efficiency. In this study, we propose an efficient and low-cost plasmonic hot electron NIR photodetector based on Au nanoparticle (Au NP)-decorated Si pyramid Schottky junction...
May 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28530487/effects-of-pre-season-training-on-the-sleep-characteristics-of-professional-rugby-league-players
#13
Heidi R Thornton, Jace A Delaney, Grant M Duthie, Ben J Dascombe
PURPOSE: To investigate the influence of daily and exponentially-weighted moving training loads on subsequent night-time sleep. METHODS: Sleep of fourteen professional rugby league athletes competing in the National Rugby League competition was recorded using wristwatch actigraphy. Physical demands were quantified using GPS technology, including total distance (TD), high-speed distance (HSD), acceleration/deceleration load (SumAccDec; AU), and sRPE (AU). Linear mixed models determined effects of acute (daily) and sub-acute (three- and seven-day) exponentially-weighted moving averages (EWMA) on sleep...
May 22, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28530472/telomerase-expression-in-medaka-oryzias-melastigma-pharyngeal-teeth
#14
W H Tan, P E Witten, C Winkler, D W T Au, A Huysseune
Nonmammalian vertebrates have the capacity of lifelong tooth replacement. In all vertebrates, tooth formation requires contact and interaction between the oral or pharyngeal epithelium and the underlying mesenchyme. To secure lifelong replacement, the presence of odontogenic stem cells has been postulated, particularly in the epithelial compartment. This study uses an advanced teleost fish species, the marine medaka Oryzias melastigma, a close relative to Oryzias latipes, to examine the expression and distribution of telomerase reverse transcriptase (Tert), the catalytic unit of telomerase, in developing pharyngeal teeth and to relate these data to the proliferative activity of the cells...
June 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28530390/highly-sensitive-durable-and-multifunctional-sensor-inspired-by-spider
#15
Chengzhi Luo, Junji Jia, Youning Gong, Zhongchi Wang, Qiang Fu, Chunxu Pan
Sensitivity, durability, and multifunction are the essential requirements for a high- performance wearable sensor. Here, we report a novel multifunctional sensor with high sensitivity and durability by using a buckled spider silk-like single-walled carbon nanotubes (SSL-SWNTs) film as the conducting network and a crack-shaped Au film as the sensitive transducer. Its high sensitivity is inspired by the crack-shaped structure of the spider's slit organs, while the high durability is inspired by the mechanical robustness of the spider silk...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530270/two-photon-photoelectron-emission-microscopy-for-surface-plasmon-polaritons-at-the-au-111-surface-decorated-with-alkanethiolate-self-assembled-monolayers
#16
Kana Yamagiwa, Masahiro Shibuta, Atsushi Nakajima
In this study, we have employed dual-color photoelectron emission microscopy (2P-PEEM) to visualize surface plasmon polaritons (SPPs) propagating along a chemically modified organic/metal interface of alkanethiolate self-assembled monolayers (Cn-SAMs; n is the number of alkyl carbon atoms) formed on Au(111). In dual-color 2P-PEEM, near-infrared photons around 900 nm generate SPPs at the Cn-SAMs/Au(111) interface, which interfere with the remaining light field. The resulting surface polarization beats are imaged as local distributions of 2P-photoelectrons probed by ultraviolet photons...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28530247/long-range-ferrimagnetic-order-in-a-two-dimensional-supramolecular-kondo-lattice
#17
Jan Girovsky, Jan Nowakowski, Md Ehesan Ali, Milos Baljozovic, Harald R Rossmann, Thomas Nijs, Elise A Aeby, Sylwia Nowakowska, Dorota Siewert, Gitika Srivastava, Christian Wäckerlin, Jan Dreiser, Silvio Decurtins, Shi-Xia Liu, Peter M Oppeneer, Thomas A Jung, Nirmalya Ballav
Realization of long-range magnetic order in surface-supported two-dimensional systems has been challenging, mainly due to the competition between fundamental magnetic interactions as the short-range Kondo effect and spin-stabilizing magnetic exchange interactions. Spin-bearing molecules on conducting substrates represent a rich platform to investigate the interplay of these fundamental magnetic interactions. Here we demonstrate the direct observation of long-range ferrimagnetic order emerging in a two-dimensional supramolecular Kondo lattice...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28530201/ultrafast-growth-of-large-area-monolayer-mos2-film-via-gold-foil-assistant-cvd-for-high-sensitive-photodetector
#18
Changbin Nie, Leyong Yu, Xingzhan Wei, Jun Shun, Wenqiang Lu, Weimin Chen, Shuanglong Feng, Haofei Shi
Two-dimensional molybdenum disulfide (MoS2) is a promising material for ultrasensitive photodetector owing to its tunable band gap and high absorption coefficient. However, controlled synthesis of high quality, large area monolayer molybdenum disulfide (MoS2) is still a challenge in practical application. In this work, we report a gold foil assistant chemical vapor deposition (CVD) method of large size (>400 μm) single crystal MoS2 film on silicon dioxide (SiO2) substrate. The influence of Au foil in enlarging the size of single crystal MoS2 were investigated systemically using thermal simulation in Ansys workbench 16...
May 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28529078/hcsgd-an-integrated-database-of-human-cellular-senescence-genes
#19
Qiongye Dong, Hongqing Han, Xuehui Liu, Lei Wei, Wei Zhang, Zhen Zhao, Michael Q Zhang, Xiaowo Wang
Cellular senescence is an irreversible cell cycle arrest program in response to various exogenous and endogenous stimuli like telomere dysfunction and DNA damage. It has been widely accepted as an anti-tumor program and is also found closely related to embryo development, tissue repair, organismal aging and age-related degenerative diseases. In the past decades, numerous efforts have been made to uncover the gene regulatory mechanisms of cellular senescence. There is a strong demand to integrate these data from various resources into one open platform...
April 29, 2017: Journal of Genetics and Genomics, Yi Chuan Xue Bao
https://www.readbyqxmd.com/read/28528543/plasmon-enhanced-energy-transfer-in-photosensitive-nanocrystal-device
#20
Shahab Akhavan, Mehmet Zafer Akgul, Pedro Ludwig Hernandez Martinez, Hilmi Volkan Demir
Förster resonance energy transfer (FRET) interacted with localized surface plasmon (LSP) gives us the ability to overcome inadequate transfer of energy between donor and acceptor nanocrystals (NCs). In this paper, we show LSP-enhanced FRET in colloidal photosensors of NCs in operation, resulting in substantially enhanced photosensitivity. The proposed photosensitive device is a layered self-assembled colloidal platform consisting of separated monolayers of the donor and the acceptor colloidal NCs with an intermediate metal nanoparticle (MNP) layer made of gold inter-spaced by polyelectrolyte layers...
May 20, 2017: ACS Nano
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