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https://www.readbyqxmd.com/read/29149992/a-separable-surface-enhanced-raman-scattering-substrate-modified-with-mil-101-for-detection-of-overlapping-and-invisible-compounds-after-thin-layer-chromatography-development
#1
Bin Bin Zhang, Yi Shi, Hui Chen, Qing Xia Zhu, Feng Lu, Ying Wei Li
By coupling surface-enhanced Raman spectroscopy (SERS) with thin-layer chromatography (TLC), a powerful method for detecting complex samples was successfully developed. However, in the TLC-SERS method, metal nanoparticles serving as the SERS-active substrate are likely to disturb the detection of target compounds, particularly in overlapping compounds after TLC development. In addition, the SERS detection of compounds that are invisible under both visible light and UV254/365 after TLC development is still a significant challenge...
January 2, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29148790/solid-state-dewetting-of-gold-aggregates-islands-on-tio2-nanorod-structures-grown-by-oblique-angle-deposition
#2
Shizhao Liu, Joel Plawsky
A composite film made of a stable, gold nanoparticle (NP) array with well-controlled separation and size atop a TiO2 nanorod film was fabricated via the oblique angle deposition technique (OAD). The fabrication of the nanoparticle array is based on controlled, Rayleigh-instability-induced, solid-state dewetting of as-deposited gold aggregates on the TiO2 nanorods. It was found that the initial spacing between as-deposited gold aggregates along the vapor flux direction should be greater than the TiO2 inter-rod spacing created by 80° OAD in order to control the dewetting and produce NP arrays...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148789/amphiphilic-n-heterocyclic-carbene-stabilized-gold-nanoparticles-and-their-self-assembly-in-polar-solvents
#3
Mina R Narouz, Chien-Hung Li, Ali Nazemi, Cathleen M Crudden
Soft matter-directed self-assembly of amphiphilic inorganic nanoparticles (NPs) has recently emerged as a promising approach to access NP ensembles with superior collective properties. While thiol-terminated molecules are primarily employed to tether the amphiphilic ligand to the metal, serious concerns remain regarding the stabilities of the resulting NPs and their corresponding superstructures. As an alternative to such ligands, we report the first example of amphiphilic N-heterocyclic carbene (NHC)-functionalized gold nanoparticles (AuNPs)...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148778/ligand-mediated-deposition-of-noble-metals-at-nanoparticle-plasmonic-hotspots
#4
Patrick J Straney, Nathan A Diemler, Ashley M Smith, Zachary E Eddinger, Matthew S Gilliam, Jill E Millstone
We report the use of gold nanoparticle surface chemistry as a tool for site-selective noble metal deposition onto colloidal gold nanoparticle substrates. Specifically, we demonstrate that partial passivation of the gold nanoparticle surface using thiolated ligands can induce a transition from linear palladium island deposition to growth of palladium selectively at plasmonic hotspots on the edges or vertices of the underlying particle substrate. Further, we demonstrate the broader applicability of this approach with respect to substrate morphology (e...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148554/modelling-direct-dna-damage-for-gold-nanoparticle-enhanced-proton-therapy
#5
Marios Sotiropoulos, Nicholas T Henthorn, John W Warmenhoven, Ranald I Mackay, Karen J Kirkby, Michael J Merchant
Gold nanoparticles have been proven as potential radiosensitizer when combined with protons. Initially the radiosensitization effect was attributed to the physical interactions of radiation with the gold and the production of secondary electrons that induce DNA damage. However, emerging data challenge this hypothesis, supporting the existence of alternative or supplementary radiosensitization mechanisms. In this work we incorporate a realistic cell model with detailed DNA geometry and a realistic gold nanoparticle biodistribution based on experimental data...
November 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/29144733/a-mechanism-for-symmetry-breaking-and-shape-control-in-single-crystal-gold-nanorods
#6
Michael J Walsh, Wenming Tong, Hadas Katz-Boon, Paul Mulvaney, Joanne Etheridge, Alison M Funston
The phenomenon of symmetry breaking-in which the order of symmetry of a system is reduced despite manifest higher-order symmetry in the underlying fundamental laws-is pervasive throughout science and nature, playing a critical role in fields ranging from particle physics and quantum theory to cosmology and general relativity. For the growth of crystals, symmetry breaking is the crucial step required to generate a macroscopic shape that has fewer symmetry elements than the unit cell and/or seed crystal from which it grew...
November 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29143694/cryo-scanning-electron-microscopy-sem-and-scanning-transmission-electron-microscopy-stem-in-sem-for-bio-and-organo-mineral-interface-characterization-in-the-environment
#7
Guillaume Wille, Jennifer Hellal, Patrick Ollivier, Annie Richard, Agnes Burel, Louis Jolly, Marc Crampon, Caroline Michel
Understanding biofilm interactions with surrounding substratum and pollutants/particles can benefit from the application of existing microscopy tools. Using the example of biofilm interactions with zero-valent iron nanoparticles (nZVI), this study aims to apply various approaches in biofilm preparation and labeling for fluorescent or electron microscopy and energy dispersive X-ray spectrometry (EDS) microanalysis for accurate observations. According to the targeted microscopy method, biofilms were sampled as flocs or attached biofilm, submitted to labeling using 4',6-diamidino-2-phenylindol, lectins PNA and ConA coupled to fluorescent dye or gold nanoparticles, and prepared for observation (fixation, cross-section, freezing, ultramicrotomy)...
November 16, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/29143632/a-method-for-estimating-maternal-and-newborn-lives-saved-from-health-related-investments-funded-by-the-uk-government-department-for-international-development-using-the-lives-saved-tool
#8
Ingrid K Friberg, Angela Baschieri, Jo Abbotts
BACKGROUND: In 2010, the UK Government Department for International Development (DFID) committed through its 'Framework for results for reproductive, maternal and newborn health (RMNH)' to save 50,000 maternal lives and 250,000 newborn lives by 2015. They also committed to monitoring the performance of this portfolio of investments to demonstrate transparency and accountability. Methods currently available to directly measure lives saved are cost-, time-, and labour-intensive. The gold standard for calculating the total number of lives saved would require measuring mortality with large scale population based surveys or annual vital events surveillance...
November 7, 2017: BMC Public Health
https://www.readbyqxmd.com/read/29140682/molecular-patterning-and-directed-self-assembly-of-gold-nanoparticles-on-gaas
#9
Tianhan Liu, Timothy D Keiper, Xiaolei Wang, Guang Yang, Daniel T Hallinan, Jianhua Zhao, Peng Xiong
The ability to create micro/nano patterns of organic self-assembled monolayers (SAMs) on semiconductor surfaces is crucial for fundamental studies and applications in a number of emerging fields in nanoscience. Here, we demonstrate the direct patterning of thiolate SAMs on oxide-free GaAs surface by dip-pen nanolithography (DPN) and micro-contact printing (μCP), facilitated by a process of surface etching and passivation of the GaAs. A quantitative analysis on the molecular diffusion on GaAs was conducted by examining the writing of nanoscale dot and line patterns by DPN, which agrees well with surface diffusion models...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29136917/one-step-direct-immunoassay-with-horseradish-peroxidase-as-antigen-for-studying-the-functionality-of-antibody-surfaces
#10
G Coussot, C Faye, A Le Postollec, M Dobrijevic
Antibody-coated surfaces (Ab surfaces) play a key role in bioanalytical tools developed for biosensors and diagnostics. Therefore, a high and well-defined functional activity of the Ab surface is required. The functional activity of the Ab surface depends on its available binding sites i.e. "the active sites" that are able to capture antigen (Ag). The number of active binding sites strongly depends on the immobilization strategy used to fix the Ab on the solid surface. Determination of layer thickness or surface topology are often used to characterize the Ab surfaces but there is no gold standard method for the study of the functionality of the Ab surfaces...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136884/electrooxidation-and-amperometric-determination-of-vorinostat-on-hierarchical-leaf-like-gold-nanolayers
#11
R Dehdari Vais, K Karimian, H Heli
Hierarchical leaf-like gold nanolayers were electrodeposited using choline chloride as a shape directing agent and characterized using field emission scanning electron microscopy. The electrooxidation behavior of vorinostat was then studied on the nanolayers and the kinetic parameters of the electrodic process were obtained by voltammetric measurements in a phosphate buffer solution at pH 7.40. Vorinostat was electrooxidized on the nanolayers' surface at a lower potential and with a higher rate, compared to a polycrystalline smooth gold surface, through an irreversible process...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136287/quantification-of-mri-visibility-and-artefacts-at-3t-of-liquid-fiducial-marker-in-a-pancreas-tissue-mimicking-phantom
#12
Sergej Schneider, Rasmus Irming Jølck, Esther Gera Cornelia Troost, Aswin Louis Hoffmann
PURPOSE: X-ray based position verification of the target volume in image-guided radiation therapy (IGRT) of patients with pancreatic ductal adenocarcinoma (PDAC) is currently performed on solid fiducial markers that are implanted under endoscopic ultrasonography. A new biodegradable liquid fiducial marker has recently been introduced. To assess its potential use for magnetic resonance imaging (MRI) guided photon or proton radiotherapy of PDAC, the MRI visibility and artefacts of this marker were quantified and compared against solid gold markers...
November 14, 2017: Medical Physics
https://www.readbyqxmd.com/read/29135897/is-bmi-a-valid-measure-of-obesity-in-postmenopausal-women
#13
Hailey R Banack, Jean Wactawski-Wende, Kathleen M Hovey, Andrew Stokes
OBJECTIVE: Body mass index (BMI) is a widely used indicator of obesity status in clinical settings and population health research. However, there are concerns about the validity of BMI as a measure of obesity in postmenopausal women. Unlike BMI, which is an indirect measure of obesity and does not distinguish lean from fat mass, dual-energy x-ray absorptiometry (DXA) provides a direct measure of body fat and is considered a gold standard of adiposity measurement. The goal of this study is to examine the validity of using BMI to identify obesity in postmenopausal women relative to total body fat percent measured by DXA scan...
November 13, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/29135228/influence-of-relativistic-effects-on-bonding-modes-in-m-ii-dinuclear-complexes-m-au-ag-and-cu
#14
Paul Jerabek, Beatriz von der Esch, Hubert Schmidbaur, Peter Schwerdtfeger
The stability and bonding in dinuclear group 11 metal complexes (M = Au, Ag, and Cu) in their +2 oxidation state has been investigated by quantum chemical methods. Two model complexes were selected as representatives of different bonding situations in the dinuclear M(II) complexes, a direct metal-metal bond between two ligand stabilized monomers and ligand-mediated bridged dimer system, making them interesting for a direct comparison and to study the influence of relativistic effects. Relativity substantially stabilizes the direct metal-metal bonded system obtaining the sequence in M-M bond stability Au > Ag > Cu...
November 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29131927/direct-evidence-for-the-origin-of-bis-gold-intermediates-probing-gold-catalysis-with-mass-spectrometry
#15
Mei Lu, Yijin Su, Pengyi Zhao, Xiaohan Ye, Yi Cai, Xiaodong Shi, Eric Masson, Fengyao Li, J Larry Campbell, Hao Chen
Gold-catalyzed alkyne hydration was studied using in-situ reacting mass spectrometry (MS) technology. By monitoring the reaction process in solution under different conditions (regular and very diluted catalyst concentrations, different pHs) and examining the reaction occurrence in the early reaction stage (1-2 ms after mixing) with MS, we collected a series of experimental evidence to support that the bisgold complex is a key reaction intermediate. Furthermore, both experimental and computational studies confirmed that the σ,π-bisgold complexes are not active intermediate toward nucleophilic addition...
November 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29131859/development-and-validation-of-an-immunoperoxidase-antigen-detection-test-for-improved-diagnosis-of-rabies-in-indonesia
#16
Ibnu Rahmadane, Andrea F Certoma, Grantley R Peck, Yul Fitria, Jean Payne, Axel Colling, Brian J Shiell, Gary Beddome, Susanne Wilson, Meng Yu, Chris Morrissy, Wojtek P Michalski, John Bingham, Ian A Gardner, John D Allen
Rabies continues to pose a significant threat to human and animal health in regions of Indonesia. Indonesia has an extensive network of veterinary diagnostic laboratories and the 8 National laboratories are equipped to undertake diagnostic testing for rabies using the commercially-procured direct fluorescent antibody test (FAT), which is considered the reference (gold standard) test. However, many of the Indonesian Provincial diagnostic laboratories do not have a fluorescence microscope required to undertake the FAT...
November 13, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29131220/highly-regioselective-gold-catalyzed-formal-hydration-of-propargylic-gem-difluorides
#17
Jean-Denys Hamel, Tatsuru Hayashi, Mélissa Cloutier, Paul R Savoie, Olivier Thibeault, Meggan Beaudoin, Jean-François Paquin
Herein, we report a highly regioselective gold-catalyzed formal hydration of propargylic gem-difluorides. Not only does this transformation provide access to versatile fluorinated building blocks that were difficult or hardly possible to access beforehand, but it also represents a rare case of a highly regioselective gold-catalyzed hydroalkoxylation of internal alkynes and puts forward the utility of the difluoromethylene unit as a directing group in catalysis.
November 13, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29130197/detection-of-mrna-and-associated-molecules-by-ish-iem-on-frozen-sections
#18
Catherine Rabouille
The use of tagged RNA probes to directly hybridize frozen sections of chemically fixed tissues, followed by the tag detection with specific antibodies and gold conjugates form the core of the in situ hybridization (ISH)-immunoelectron microscopy (IEM) method that we have developed and successfully used to detect endogenous gurken and bicoid mRNAs in Drosophila oocytes.
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29128570/outcomes-in-degenerative-mitral-regurgitation-current-state-of-the-art-and-future-directions
#19
REVIEW
Milind Y Desai, Francesco Grigioni, Marco Di Eusanio, Matteo Saccocci, Maurizio Taramasso, Francesco Maisano, Rakesh M Suri, A Marc Gillinov
Mitral regurgitation (MR) is the one of the most frequent valvular heart diseases in the developed world, often requiring surgical correction. Degenerative MR is the most common type of non-ischemic, organic MR in the western world. Since no medical treatment has been shown to be effective in preventing the consequences of volume overload in asymptomatic degenerative MR, risk stratification is essential. Currently, this is achieved using clinical and precisely quantified echocardiographic parameters, with newer technologies like cardiac magnetic resonance gaining increasing prominence...
November 8, 2017: Progress in Cardiovascular Diseases
https://www.readbyqxmd.com/read/29128378/ebola-virus-disease-report-from-the-task-force-on-tropical-diseases-by-the-world-federation-of-societies-of-intensive-and-critical-care-medicine
#20
REVIEW
Guy A Richards, Tim Baker, Pravin Amin
Ebola virus is a filovirus that can cause fatal hemorrhagic fever (HF) and five distinct species exist that vary in terms of geographical distribution and virulence. Once the more virulent forms enter the human population, transmission occurs primarily through direct contact with infected body fluids and may result in significant outbreaks. The devastating has been the recent West African outbreak. Clinically, signs and symptoms are similar to those of the other VHFs [4]. The incubation period is 2-21days, followed by fever, headache, myalgia, diarrhoea, vomiting and dehydration; thereafter, there may be recovery or deterioration with collapse, neurological manifestations and bleeding, that can lead to a fatal outcome...
November 3, 2017: Journal of Critical Care
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