keyword
MENU ▼
Read by QxMD icon Read
search

Au

keyword
https://www.readbyqxmd.com/read/29346720/nanoscale-control-of-molecular-self-assembly-induced-by-plasmonic-hot-electron-dynamics
#1
Sabrina Simoncelli, Yi Li, Emiliano Cortes, Stefan A Maier
Self-assembly processes allow designing and creating complex nanostructures using molecules as building blocks and surfaces as scaffolds. This autonomous driven construction is possible due to a complex thermodynamic balance of molecule-surface interactions. As such, nanoscale guidance and control over this process is hard to achieve. Here we use the highly localized light-to-chemical-energy conversion of plasmonic materials to spatially cleave Au-S bonds on pre-determined locations within a single nanoparticle, enabling a high degree of control over this archetypal system for molecular self-assembly...
January 18, 2018: ACS Nano
https://www.readbyqxmd.com/read/29346698/procedural-knowledge-and-skills-of-residents-entering-canadian-family-medicine-programs-in-alberta
#2
Juan Antonio Garcia-Rodriguez, James A Dickinson, Grace Perez, David Ross, Lilian Au, Shelley Ross, Oksana Babenko, Ian Johnston
BACKGROUND AND OBJECTIVES: Incoming family medicine (FM) residents start residency with different levels of procedural training. Understanding their baseline skill level is necessary to plan the educational experiences and teaching methods that will provide the desired knowledge, skills, and attitudes related to performing medical procedures. METHODS: A survey of 69 procedures based on the core list issued by the College of Family Physicians of Canada was administered to incoming residents in Alberta (Calgary and Edmonton FM programs)...
January 2018: Family Medicine
https://www.readbyqxmd.com/read/29346358/rates-of-unsuspected-thyroid-cancer-in-multinodular-thyroid-disease
#3
Miriam Karalus, Jade Au Tamatea, Helen M Conaglen, Goswin Y Meyer-Rochow, John V Conaglen, Marianne S Elston
BACKGROUND: Previously the risk of concomitant thyroid cancer in multinodular goitre (MNG) has been reported as approximately 4%. Cancer risk in toxic MNG was often considered lower than for non-toxic MNG, due to a possible protective effect of TSH suppression. However, recent American data suggest an approximately 18% risk of occult malignancy in both toxic and non-toxic MNG. AIMS: To assess malignancy risk in a New Zealand population undergoing thyroidectomy for MNG...
January 19, 2018: New Zealand Medical Journal
https://www.readbyqxmd.com/read/29346037/development-of-an-ultrasensitive-pcr-assay-for-polycyclic-musk-determination-in-fish
#4
Xiaohan Zhang, Huisheng Zhuang
Polycyclic musks (PCMs) in the aquatic environment and organisms have become an emerging environmental issue because of their potential risk. The most used method for polycyclic musk determination is gas chromatography-mass spectrometry (GC-MS) with different sample extractions, which are somewhat expensive to operate, complex and laborious. In this study, a novel and ultrasensitive real-time polymerase chain reaction (PCR) assay with multiple signal amplification of carboxylic-DNA by gold nanoparticle-polyamidoamine conjugation (Au-PAMAM) was developed for determining polycyclic musks in fish...
January 18, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29345701/effects-of-particle-size-and-annealing-on-plasmon-induced-charge-separation-at-self-assembled-gold-nanoparticle-arrays
#5
Kun-Che Kao, Hiroyasu Nishi, Tetsu Tatsuma
Two-dimensional periodic Au nanoparticle arrays were constructed on TiO2 thin films by a micelle lithography method and seed-mediated photoelectrochemical growth. Their adjustable interparticle distance allows investigation of a particle size effect on plasmon-induced charge separation (PICS) efficiencies without interference from particle aggregation or plasmon coupling. External or internal PICS efficiencies were found to increase and decrease, respectively, with an increase in particle diameter from 25 to 38 nm...
January 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29345628/reversibility-and-intermediate-steps-as-key-tools-for-the-growth-of-extended-ordered-polymers-via-on-surface-synthesis
#6
Marco Di Giovannantonio, Giorgio Contini
Surface-confined polymerization is a bottom-up strategy to create one- and two-dimensional covalent organic nanostructures with a π-conjugated backbone, which are suitable to be employed in real-life electronic devices, due to their high mechanical resistance and electronic charge transport efficiency. This strategy makes it possible to change the properties of the final nanostructures by a careful choice of the monomer architecture (<i>i.e.</i> of its constituent atoms and their spatial arrangement)...
January 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29345458/synthesis-of-magnetite-semiconductor-metal-trimer-nanoparticles-through-functional-modular-assembly-a-magnetically-separable-photocatalyst-with-photothermic-enhancement-for-water-reduction
#7
Fei Pang, Ruifang Zhang, Dengpeng Lan, Jianping Ge
Hybrid nanoparticles have intrinsic advantages to achieve better activity in photocatalysis compared to single component materials, as it can synergistically combine functional components which promote light absorption, charge transportation, surface reaction and catalyst regeneration. Through functional modular assembly, a rational and stepwise approach has been developed to construct Fe3O4-CdS-Au trimer nanoparticles and its derivatives as magnetically separable catalysts for photothermo-catalytic hydrogen evolution from water...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345454/stability-and-performance-of-cspbi2br-thin-films-and-solar-cell-devices
#8
Silvia Mariotti, Oliver S Hutter, Laurie J Phillips, Peter J Yates, Biswajit Kundu, Ken Durose
In this manuscript, the inorganic perovskite CsPbI2Br is investigated as a photovoltaic material that offers higher stability than the organic-inorganic hybrid perovskite materials. It is demonstrated that CsPbI2Br does not irreversibly degrade to its component salts as in the case of methylammonium lead iodide but instead is induced (by water vapor) to transform from its metastable brown cubic (1.92 eV band gap) phase to a yellow phase having a higher band gap (2.85 eV). This is easily reversed by heating to 350 °C in a dry environment...
January 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29345265/hierarchical-formation-of-fe-9eg-supramolecular-networks-via-flexible-coordination-bonds
#9
Chi Zhang, Lei Xie, Yuanqi Ding, Chunxue Yuan, Wei Xu
From the interplay between high-resolution scanning tunneling microscopy imaging/manipulations and density functional theory calculations, we display the hierarchical formation of supramolecular networks by codeposition of 9eG molecules and Fe atoms on Au(111) based on the flexible coordination bonds (the adaptability and versatility in the coordination modes). In the first step, homochiral islands composed of homochiral G4Fe2 motifs are formed; and then in the second step, thermal treatment results in the transformation into the porous networks composed of heterochiral G4Fe2 motifs with the ratio of the components being constant...
January 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29344837/evaluation-of-the-profile-and-mechanism-of-neurotoxicity-of-water-soluble-cu-p-4-pf6-and-au-p-4-pf6-p-thp-or-pta-anticancer-complexes
#10
C Ceresa, G Nicolini, S Semperboni, V Gandin, M Monfrini, F Avezza, P Alberti, A Bravin, M Pellei, C Santini, Guido Cavaletti
[Cu(thp)4]PF6, [Cu(PTA)4]PF6, [Au(thp)4]PF6 and [Au(PTA)4]PF6 are phosphane (thp = tris(hydroxymethyl)phosphane; PTA = 1,3,5-triaza-7-phosphaadamantane) copper(I) and gold(I) water-soluble complexes characterized by high anticancer activity in a wide range of solid tumors, often able to overcome drug resistance of platinum-based compounds. For these reasons, they have been proposed as a valid alternative to platinum-based chemotherapeutic drugs (e.g., cisplatin and oxaliplatin). In vitro experiments performed on organotypic cultures of dorsal root ganglia (DRG) from 15-day-old rat embryos revealed that copper-based compounds were not neurotoxic even at concentrations higher than the IC50 obtained in human cancer cells while [Au(PTA)4]PF6 was neurotoxic at lower concentration than IC50 in cancer cell lines...
January 17, 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/29343742/highly-effective-and-chemically-stable-surface-enhanced-raman-scattering-substrates-with-flower-like-3d-ag-au-hetero-nanostructures
#11
Ying Zhang, Chengliang Yang, Bin Xue, Zenghui Peng, Zhaoliang Cao, Quanquan Mu, Li Xuan
We demonstrated flower-like 3D Ag-Au hetero-nanostructures on an indium tin oxide glass (ITO glass) for surface enhanced Raman scattering (SERS) applications. The flower-like 3D Ag nanostructures were obtained through electrodeposition with liquid crystalline soft template which is simple, controllable and cost effective. The flower-like 3D Ag-Au hetero-nanostructures were further fabricated by galvanic replacement reaction of gold (III) chloride trihydrate (HAuCl4·3H2O) solution and flower-like Ag. The flower-like Ag-Au hetero-nanostructure exhibited stronger SERS effects and better chemical stability compared with flower-like Ag nanostructure...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343696/decoupled-in-plane-dipole-resonance-modulated-colorimetric-assay-based-optical-ruler-for-ultra-trace-gold-au-detection
#12
Ajoy Mandal, Maireyee Bhattacharya, Denis V Kuznetsov, Tapas Ghosh, Sudeshna Das Chakraborty, Biswarup Satpati, Vsevolod Mazov, Dulal Senapati
Decoupling of different plasmon resonance modes (in-plane, and out-of-plane dipole and quadrupole resonances) by tuning nanoparticle's size and shape offers a new field of plasmonics as colorimetric assay-based optical-ruler for ultra-trace sensing. Driven by its low cost, easy to perform and efficient way to measure trace level (up to 30 ppt in presence of common mining elements in natural gold ore) abundance, this study develops a highly selective and ultrasensitive turn-on colorimetric sensor to detect gold-ion from environmental samples...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343056/a-phosphorescent-trinuclear-gold-i-pyrazolate-chemosensor-for-silver-ion-detection-and-remediation-in-aqueous-media
#13
Prabhat K Upadhyay, Sreekar B Marpu, Erin N Benton, Corshai L Williams, Ameya Telang, Mohammad A Omary
We report a phosphorescent chemosensor based on a trinuclear Au(I) pyrazolate complex or [Au(3-CH3,5-COOH)Pz]3, (aka Au3Pz3) stabilized in aqueous chitosan (CS) polymer media. Au3Pz3 is synthesized in situ within aqueous CS media at pH ~ 6.5 and room temperature (RT). Au3Pz3 exhibits strong red emission (λmax ~690 nm) in such solutions. The Au3Pz3 emission is found to be sensitive to sub-ppm/nM levels of silver ions. On addition of silver salt to Au3Pz3/CS aqueous media, a bright-green emissive adduct (Au3Pz3/Ag+) with peak maximum within 475-515 nm is developed...
January 17, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29341908/induction-of-au-methotrexate-conjugates-by-sugar-molecules-production-assembly-mechanism-and-bioassay-studies
#14
Wei-Yuan Wang, Xiu-Fen Zhao, Xiao-Han Ju, Ping Liu, Jing Li, Ya-Wen Tang, Shu-Ping Li, Xiao-Dong Li, Fu-Gui Song
Au-methotrexate (Au-MTX) conjugates induced by sugar molecules were produced by a simple, one-pot, hydrothermal growth method. Herein, the Au(III)-MTX complexes were used as the precursors to form Au-MTX conjugates. Addition of different types of sugar molecules with abundant hydroxyl groups resulted in the formation of Au-MTX conjugates featuring distinct characteristics that could be explained by the diverse capping mechanisms of sugar molecules. That is, the instant-capping mechanism of glucose favored the generation of peanut-like Au-MTX conjugates with high colloidal stability while the post-capping mechanism of dextran and sucrose resulted in the production of Au-MTX conjugates featuring excellent near-infrared (NIR) optical properties with a long-wavelength plasmon resonance near 630-760 nm...
January 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29341710/vibrational-action-spectroscopy-of-solids-new-surface-sensitive-technique
#15
Zongfang Wu, Agata Płucienik, Felix E Feiten, Matthias Naschitzki, Walter Wachsmann, Sandy Gewinner, Wieland Schöllkopf, Volker Staemmler, Helmut Kuhlenbeck, Hans-Joachim Freund
Vibrational action spectroscopy employing infrared radiation from a free-electron laser has been successfully used for many years to study the vibrational and structural properties of gas phase aggregates. Despite the high sensitivity of this method no relevant studies have yet been conducted for solid sample surfaces. We have set up an experiment for the application of this method to such targets, using infrared light from the free-electron laser of the Fritz Haber Institute. In this Letter, we present first results of this technique with adsorbed argon and neon atoms as messengers...
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29341583/tumor-catalytic-photothermal-therapy-with-yolk-shell-gold-carbon-nanozymes
#16
Lei Fan, Xiangdong Xu, Chunhua Zhu, Jie Han, Lizeng Gao, Juqun Xi, Rong Guo
Nanozymes, as a new generation of artificial enzymes, offer great opportunities in biomedical engineering and disease treatment. Synergizing the multiple intrinsic functions of nanozymes can improve their performance in biological systems. Here, we report a novel nanozyme with yolk-shell structure fabricated by combining a single gold nanoparticle core with a porous hollow carbon shell nanospheres (Au@HCNs). Au@HCNs exhibited enzyme-like activities similar to horseradish peroxidase and oxidase under an acidic environment, showing the ability of ROS generation...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29341261/consensus-statements-on-the-clinical-understanding-and-use-of-milnacipran-in-hong-kong
#17
REVIEW
Wing King Lee, Kwok Leung Au Yeung, Ho Bun Lam, Chi Keung Wong, Ming Kai Au, Hoi Yee Karina Chan, Yat Wo Eric Cheung, Wing Ho Chui, Ting Chi Vanessa Wong, Chi Kin Fu, Shiu Kow Sham, Ki Yan Mak
OBJECTIVE: Our aim is to develop a local consensus to guide medical practitioners and psychiatrists on the use of milnacipran in different psychiatric conditions. METHODS: By utilizing the modified Delphi technique, 12 statements were electronically voted on anonymously for their practicability of recommendation. RESULTS: There was a very high degree of agreement among the consensus group on 10 finalized consensus statements, but 2 statements were voted down due to a poor degree of agreement...
January 17, 2018: Human Psychopharmacology
https://www.readbyqxmd.com/read/29340395/boosting-electrocatalytic-hydrogen-evolution-by-plasmon-driven-hot-electron-excitation
#18
Hai-Xia Zhang, Yang Li, Min-Yu Li, Huabin Zhang, Jian Zhang
High-performance catalysts for electrocatalytic and photoelectrochemical water splitting hold great promise for renewable energy conversion and storage. Herein, using porous N-doped carbon supported Au nanoparticles as catalysts, we demonstrate that the photon-induced localized surface plasmon resonance (LSPR) excitation on Au nanoparticles dramatically improves the hydrogen evolution reaction (HER), leading to a more than 4-fold increase of current and meanwhile affording a markedly decreased overpotential of 99 mV at a current density of 10 mA cm-2...
January 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/29339734/au-nb-h-x-k1-xnbo3-nanopeapods-with-near-infrared-active-plasmonic-hot-electron-injection-for-water-splitting
#19
Ying-Chu Chen, Yu-Kuei Hsu, Radian Popescu, Dagmar Gerthsen, Yan-Gu Lin, Claus Feldmann
Full-spectrum utilization of diffusive solar energy by a photocatalyst for environmental remediation and fuel generation has long been pursued. In contrast to tremendous efforts in the UV-to-VIS light regime of the solar spectrum, the NIR and IR areas have been barely addressed although they represent about 50% of the solar flux. Here we put forward a biomimetic photocatalyst blueprint that emulates the growth pattern of a natural plant-a peapod-to address this issue. This design is exemplified via unidirectionally seeding core-shell Au@Nb nanoparticles in the cavity of semiconducting H x K1-xNbO3 nanoscrolls...
January 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29338572/implementation-of-additional-prescribing-authorization-among-oncology-pharmacists-in-alberta
#20
Bianca Au, Deonne Dersch-Mills, Sunita Ghosh, Jennifer Jupp, Carole Chambers, Frances Cusano, Melanie Danilak
Purpose To describe the practice settings and prescribing practices of oncology pharmacists with additional prescribing authorization. Methods A descriptive, cross-sectional survey of all oncology pharmacists in Alberta was conducted using a web-based questionnaire over four weeks between March and April 2016. Pharmacists were identified from the Cancer Services Pharmacy Directory and leadership staff in Alberta Health Services. Descriptive statistics were used to describe the practice setting, prescribing practices, motivators to apply for additional prescribing authorization, and the facilitators and barriers of prescribing...
January 1, 2018: Journal of Oncology Pharmacy Practice
keyword
keyword
4212
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"