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Search for "colloids" in Full Text gives 120 result(s) in Beilstein Journal of Nanotechnology.

Controlled graphene oxide assembly on silver nanocube monolayers for SERS detection: dependence on nanocube packing procedure

  • Martina Banchelli,
  • Bruno Tiribilli,
  • Roberto Pini,
  • Luigi Dei,
  • Paolo Matteini and
  • Gabriella Caminati

Beilstein J. Nanotechnol. 2016, 7, 9–21, doi:10.3762/bjnano.7.2

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  • Colloids and Interface Science) are acknowledged for partial financial support.
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Published 06 Jan 2016

pH-Triggered release from surface-modified poly(lactic-co-glycolic acid) nanoparticles

  • Manuel Häuser,
  • Klaus Langer and
  • Monika Schönhoff

Beilstein J. Nanotechnol. 2015, 6, 2504–2512, doi:10.3762/bjnano.6.260

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  • ultrathin polyelectrolyte multilayers (PEM) with well adjustable properties and architecture. Layer build-up is based on alternating adsorption of cationic and anionic compounds, such as polyelectrolytes [15], proteins [16], nucleic acids [17][18], dyes [19], and even colloids [14] onto the surface of
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Published 30 Dec 2015

Chemiresistive/SERS dual sensor based on densely packed gold nanoparticles

  • Sanda Boca,
  • Cosmin Leordean,
  • Simion Astilean and
  • Cosmin Farcau

Beilstein J. Nanotechnol. 2015, 6, 2498–2503, doi:10.3762/bjnano.6.259

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  • demonstration of a dual electrical/optical sensing concept based on gold nanoparticles, combining unique advantages of both chemiresistor and SERS sensors. Results and Discussion Dual sensing concept The main idea of this work stems from the fact that the same physical systems (noble metal colloids) and the
  • same fabrication tools (colloidal self-assembly) could in principle yield novel nano-enabled devices with both optical and electrical functionalities. A graphical summary describing the envisaged DEOS concept is given in Figure 1. An array of noble metal colloids assembled between electrodes on a solid
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Published 29 Dec 2015

Ultrastructural changes in methicillin-resistant Staphylococcus aureus induced by positively charged silver nanoparticles

  • Dulce G. Romero-Urbina,
  • Humberto H. Lara,
  • J. Jesús Velázquez-Salazar,
  • M. Josefina Arellano-Jiménez,
  • Eduardo Larios,
  • Anand Srinivasan,
  • Jose L. Lopez-Ribot and
  • Miguel José Yacamán

Beilstein J. Nanotechnol. 2015, 6, 2396–2405, doi:10.3762/bjnano.6.246

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  • envelope protein precursors, demonstrating that AgNPs target bacterial cell membranes by depleting the proton motive force. AgNP surfaces adsorb Ag+; therefore, colloids consist of three species of silver: Ag+, metal Ag0 (its mixture), and surface-adsorbed Ag+ [41]. Recently, the presence of three particle
  • of AgNP species is referred to as the third species, and it is central to the study of the bactericidal and ultrastructural effects of AgNPs against methicillin-sensitive Staphylococcus aureus (MSSA) and MRSA. By acquiring zeta potential measurements before and after the filtration of Ag colloids
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Published 15 Dec 2015

Green and energy-efficient methods for the production of metallic nanoparticles

  • Mitra Naghdi,
  • Mehrdad Taheran,
  • Satinder K. Brar,
  • M. Verma,
  • R. Y. Surampalli and
  • J. R. Valero

Beilstein J. Nanotechnol. 2015, 6, 2354–2376, doi:10.3762/bjnano.6.243

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Published 10 Dec 2015

Au nanoparticle-based sensor for apomorphine detection in plasma

  • Chiara Zanchi,
  • Andrea Lucotti,
  • Matteo Tommasini,
  • Sebastiano Trusso,
  • Ugo de Grazia,
  • Emilio Ciusani and
  • Paolo M. Ossi

Beilstein J. Nanotechnol. 2015, 6, 2224–2232, doi:10.3762/bjnano.6.228

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  • colloids synthesized by laser ablation in liquids, suitably functionalized and tagged with Raman reporters, have effectively revealed specific biomolecules, even in chemically complex environments such as cells [9][10][11][12]. On the other hand, silver and gold colloids produced by chemical routes can be
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Published 26 Nov 2015

An adapted Coffey model for studying susceptibility losses in interacting magnetic nanoparticles

  • Mihaela Osaci and
  • Matteo Cacciola

Beilstein J. Nanotechnol. 2015, 6, 2173–2182, doi:10.3762/bjnano.6.223

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  • nanoparticle causes changes in the orientation of its magnetization [16]. At the limit between hysteretic and superparamagnetic regime, under biomedical conditions of amplitude and frequency of the external magnetic field, susceptibility losses in magnetic colloids can be described by linear response theory
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Published 19 Nov 2015

Electrochemical behavior of polypyrrol/AuNP composites deposited by different electrochemical methods: sensing properties towards catechol

  • Celia García-Hernández,
  • Cristina García-Cabezón,
  • Cristina Medina-Plaza,
  • Fernando Martín-Pedrosa,
  • Yolanda Blanco,
  • José Antonio de Saja and
  • María Luz Rodríguez-Méndez

Beilstein J. Nanotechnol. 2015, 6, 2052–2061, doi:10.3762/bjnano.6.209

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  • The synthesis of AuNPs colloids was carried out according to the procedure proposed by Slot and Geuze [35]. Two solutions were prepared: (1) HAuCl4 (0.25·10−3 mol/L) in deionized water and (2) sodium citrate dehydrate (17·10−3 mol/L) in deionized water. 20 mL of solution (1) was heated until boiling
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Published 21 Oct 2015

Simulation tool for assessing the release and environmental distribution of nanomaterials

  • Haoyang Haven Liu,
  • Muhammad Bilal,
  • Anastasiya Lazareva,
  • Arturo Keller and
  • Yoram Cohen

Beilstein J. Nanotechnol. 2015, 6, 938–951, doi:10.3762/bjnano.6.97

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  • ENM (with size of 10 nm), ENM attached to colloids, and ENM attached to larger particles), while assuming an arbitrary value of 0.1 for both aggregation and attachment efficiencies [11]. As a consequence, the above approach does not account for the temporal dynamics of multimedia distribution and the
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Published 13 Apr 2015

Protein corona – from molecular adsorption to physiological complexity

  • Lennart Treuel,
  • Dominic Docter,
  • Michael Maskos and
  • Roland H. Stauber

Beilstein J. Nanotechnol. 2015, 6, 857–873, doi:10.3762/bjnano.6.88

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  • of individual proteins in the physiological corona. This is, however, not a straight forward task, as many colloids are well known to be unstable in serum [7][53][102][113] suggesting contributions of additional parameters. The factual situation under physiological conditions will likely consist of
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Published 30 Mar 2015

Influence of gold, silver and gold–silver alloy nanoparticles on germ cell function and embryo development

  • Ulrike Taylor,
  • Daniela Tiedemann,
  • Christoph Rehbock,
  • Wilfried A. Kues,
  • Stephan Barcikowski and
  • Detlef Rath

Beilstein J. Nanotechnol. 2015, 6, 651–664, doi:10.3762/bjnano.6.66

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  • alloy nanoparticle colloids (Figure 2) [50][54]. Besides representing the collected data, it will be put into context with other recent studies on the same subject. Effect of gold and silver nanoparticles on spermatozoa The main purpose of spermatozoa is the safe delivery of the male genome to the
  • determine though, as silver nanoparticle toxicity also depends on particle size as well as particle composition. The latter could distinctly been shown by employing gold–silver alloy colloids as model nanoparticles. The active components seem to be the Ag+ ions released from the particles, rather than the
  • nanotoxicology on reproductive cells provides an ideal tool. Schematic representation of experiments conducted within the collaboration project REPROTOX. (A) Exemplary AuAg colloids with different molar fractions. (B) Correlation of gold molar fraction with the maximum surface plasmon resonance extinction peak
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Published 05 Mar 2015

Silica micro/nanospheres for theranostics: from bimodal MRI and fluorescent imaging probes to cancer therapy

  • Shanka Walia and
  • Amitabha Acharya

Beilstein J. Nanotechnol. 2015, 6, 546–558, doi:10.3762/bjnano.6.57

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  • -shell-encapsulated hybrid nanomaterials consisting of paramagnetic Gd3+ ions and QDs or Au nanocrystals. The citric-acid-capped gold colloids and CdSe/ZnS QDs were silanized by using mercaptopropyltrimethoxysilane (MPS) as surfactant. Further, a Gd3+-DOTA (tetraazacyclododecanetetraacetic acid) complex
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Published 24 Feb 2015

Raman spectroscopy as a tool to investigate the structure and electronic properties of carbon-atom wires

  • Alberto Milani,
  • Matteo Tommasini,
  • Valeria Russo,
  • Andrea Li Bassi,
  • Andrea Lucotti,
  • Franco Cataldo and
  • Carlo S. Casari

Beilstein J. Nanotechnol. 2015, 6, 480–491, doi:10.3762/bjnano.6.49

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  • surfaces. SERS in solution has been carried out by adding silver and gold colloids to the sample solution while for surface SERS (S-SERS), silver and gold nanoislands supported on silicon and glass substrates have been used [39]. It was observed that the SERS spectrum is radically different from the Raman
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Published 17 Feb 2015

Comparative evaluation of the impact on endothelial cells induced by different nanoparticle structures and functionalization

  • Lisa Landgraf,
  • Ines Müller,
  • Peter Ernst,
  • Miriam Schäfer,
  • Christina Rosman,
  • Isabel Schick,
  • Oskar Köhler,
  • Hartmut Oehring,
  • Vladimir V. Breus,
  • Thomas Basché,
  • Carsten Sönnichsen,
  • Wolfgang Tremel and
  • Ingrid Hilger

Beilstein J. Nanotechnol. 2015, 6, 300–312, doi:10.3762/bjnano.6.28

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  • similar uptake behavior compared to the OCH3-functionalized gold colloids, indicating a clathrin- and macropinocytosis-dependent mechanism (Figure 7b). Our analysis of uptake mechanisms of different gold nanoparticle formulations confirms literature data, in which a clathrin- and macropinocytosis
  • characterization of the different nanoparticle formulations To investigate the effects of the shape, functionalization, size and composition of various nanoparticles on endothelial cells we used gold colloids (GNP), asymmetric gold@metal oxide Janus particles (Au@MnO or Au@Fe3O4), spherical metal oxides (MnO or
  • Fe3O4) and quantum dots (QDs). 1) Gold nanoparticles (GNP): The gold colloids with a core size of approximately 40 nm in diameter were synthesized according to Rosman et al. [45] and were spherically or rod-like shaped. GNP without surface functionalization were transferred to 0.1 M
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Published 27 Jan 2015

Multifunctional layered magnetic composites

  • Maria Siglreitmeier,
  • Baohu Wu,
  • Tina Kollmann,
  • Martin Neubauer,
  • Gergely Nagy,
  • Dietmar Schwahn,
  • Vitaliy Pipich,
  • Damien Faivre,
  • Dirk Zahn,
  • Andreas Fery and
  • Helmut Cölfen

Beilstein J. Nanotechnol. 2015, 6, 134–148, doi:10.3762/bjnano.6.13

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  • Laboratory for Neutron Scattering, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), 85748 Garching, Germany Department of Biomaterials, Max Planck Institute of Colloids & Interfaces Science Park Golm, 14424
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Published 12 Jan 2015

Exploring plasmonic coupling in hole-cap arrays

  • Thomas M. Schmidt,
  • Maj Frederiksen,
  • Vladimir Bochenkov and
  • Duncan S. Sutherland

Beilstein J. Nanotechnol. 2015, 6, 1–10, doi:10.3762/bjnano.6.1

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  • coupling between cap and hole arrays by UV–vis extinction spectroscopy. Figure 2 shows experimental extinction spectra of arrays of holes, arrays of caps or of coupled Cap/hole arrays schematically shown in Figure 1a formed from dispersed monolayers of 107 nm colloids with Au film thickness of 20 nm. The
  • (blue) contains two LSPR peaks one at 650 nm and one at 740 nm. We have experimentally explored the existence of coupling between the cap and hole arrays by a novel approach to vary the vertical spacing between the arrays. We make use of the glassy properties of the templating polystyrene colloids by
  • caps relative to the gold surface is reduced from ≈120 nm to 85 nm hole arrays (see Supporting Information File 1, Figure S1) as a result of reshaping of the colloids with the highest temperature implying that the gap between the lower rim of the caps and the upper edge of the hole array is <10 nm. The
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Published 02 Jan 2015

Intake of silica nanoparticles by giant lipid vesicles: influence of particle size and thermodynamic membrane state

  • Florian G. Strobl,
  • Florian Seitz,
  • Christoph Westerhausen,
  • Armin Reller,
  • Adriano A. Torrano,
  • Christoph Bräuchle,
  • Achim Wixforth and
  • Matthias F. Schneider

Beilstein J. Nanotechnol. 2014, 5, 2468–2478, doi:10.3762/bjnano.5.256

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  • of a membrane bud [21]. The results of this model are nicely described by the phase diagram depicted in Figure 2. It involves three different phases: no interaction, partial wrapping, full ingestion. Moreover, in some studies the interaction of membranes and colloids and cooperative phenomena due to
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Published 23 Dec 2014

Functionalized polystyrene nanoparticles as a platform for studying bio–nano interactions

  • Cornelia Loos,
  • Tatiana Syrovets,
  • Anna Musyanovych,
  • Volker Mailänder,
  • Katharina Landfester,
  • G. Ulrich Nienhaus and
  • Thomas Simmet

Beilstein J. Nanotechnol. 2014, 5, 2403–2412, doi:10.3762/bjnano.5.250

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  • ]. Polystyrene is biocompatible and is not expected to adversely affect interactions of nanoparticles with biological systems. Specifically surface-modified polystyrene nanoparticles are homogeneous, exhibit a low polydispersity index, and form stable colloids in biological fluids [34]. We have used polystyrene
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Published 15 Dec 2014

Localized surface plasmon resonances in nanostructures to enhance nonlinear vibrational spectroscopies: towards an astonishing molecular sensitivity

  • Dan Lis and
  • Francesca Cecchet

Beilstein J. Nanotechnol. 2014, 5, 2275–2292, doi:10.3762/bjnano.5.237

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  • , which often reduces image contrast in common immunofluorescence images. These properties promoted SE-CARS and CARS microscopy as a new tool for biomedical analysis. Still in 2011, Namboodiri et al. investigated the SERS and SE-CARS contribution from a mixture of pyridine molecules and silver colloids
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Published 28 Nov 2014

Nanoencapsulation of ultra-small superparamagnetic particles of iron oxide into human serum albumin nanoparticles

  • Matthias G. Wacker,
  • Mahmut Altinok,
  • Stephan Urfels and
  • Johann Bauer

Beilstein J. Nanotechnol. 2014, 5, 2259–2266, doi:10.3762/bjnano.5.235

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  • such as antibodies [1][2] and other proteins [3][4]. Aside the specific binding affinity, drug targeting is based on a passive accumulation mechanism that is controlled by particle size and surface characteristics of the colloids. Particles ranging in size between 50 and 300 nm accumulate in solid
  • tumors due to the enhanced permeability and retention effect [5]. While circulating through the blood stream, these colloids undergo an opsonization by the immune system followed by endocytosis into macrophages. Particles of greater diameters are rapidly cleared from the plasma and smaller colloidal
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Published 27 Nov 2014

Influence of stabilising agents and pH on the size of SnO2 nanoparticles

  • Olga Rac,
  • Patrycja Suchorska-Woźniak,
  • Marta Fiedot and
  • Helena Teterycz

Beilstein J. Nanotechnol. 2014, 5, 2192–2201, doi:10.3762/bjnano.5.228

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  • polymer choice on the size of the resulting nanoparticles was investigated and a mechanism describing their interaction was proposed. It was found that stable colloids of SnO2 nanoparticles are formed in the presence of both PEI and Triton X-100 surfactants as stabilising agents. However, an additional
  • the stabilising agent, and temperature. The main feature of colloidal systems in general (not only metal oxide colloids containing nanoparticles) is their tendency to reach the lowest thermodynamic energy state by the agglomeration of nanoparticles. This process usually results in an almost complete
  • the case where only a polymeric stabilising agent was used the diameter was 395 nm. Thus, stable colloids of tin dioxide nanoparticles are formed only in solutions containing both stabilising materials (Figure 2). According to literature reports [25], in the first reaction step, PEI creates complexes
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Published 20 Nov 2014

Biopolymer colloids for controlling and templating inorganic synthesis

  • Laura C. Preiss,
  • Katharina Landfester and
  • Rafael Muñoz-Espí

Beilstein J. Nanotechnol. 2014, 5, 2129–2138, doi:10.3762/bjnano.5.222

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  • Laura C. Preiss Katharina Landfester Rafael Munoz-Espi Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany 10.3762/bjnano.5.222 Abstract Biopolymers and biopolymer colloids can act as controlling agents and templates not only in many processes in nature, but also in a
  • recent – and in our opinion most representative – synthetic works involving the use of biopolymer and biopolymer colloids for the design of inorganic and inorganic/organic materials, with special emphasis on particles and particle synthesis. In the formation of polymer/inorganic hybrid materials, both
  • materials. We propose the following classification, being aware that all divisions are arbitrary to some degree and it may be difficult to place some of the examples in one or other group without ambiguity: A. The use of biopolymers and biopolymer colloids as controlling agents for the precipitation and
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Published 17 Nov 2014

The surface properties of nanoparticles determine the agglomeration state and the size of the particles under physiological conditions

  • Christoph Bantz,
  • Olga Koshkina,
  • Thomas Lang,
  • Hans-Joachim Galla,
  • C. James Kirkpatrick,
  • Roland H. Stauber and
  • Michael Maskos

Beilstein J. Nanotechnol. 2014, 5, 1774–1786, doi:10.3762/bjnano.5.188

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  • /or complex questions, such as the investigation of the agglomeration behavior of colloids under physiological conditions. While addressing questions of such complexity, the necessity for a high level of expertise in light scattering data acquisition, evaluation, and interpretation arises from the
  • determination in AF-FFF is not absolute [39]. The mentioned interactions are strongly affected by the concentration and the type of the electrolyte that is added to the eluate. When increasing the salinity of the dispersant, electrostatic repulsions of colloids are reduced by decreasing the Debye screening
  • measure for polydispersity. In the third column, the hydrodynamic radii that were obtained for measurements in deionized water are shown. One potential problem of measuring colloids in deionized water was already described above. That is, the inter-particle interactions can cause artifacts in the angular
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Published 15 Oct 2014

Influence of surface-modified maghemite nanoparticles on in vitro survival of human stem cells

  • Michal Babič,
  • Daniel Horák,
  • Lyubov L. Lukash,
  • Tetiana A. Ruban,
  • Yurii N. Kolomiets,
  • Svitlana P. Shpylova and
  • Oksana A. Grypych

Beilstein J. Nanotechnol. 2014, 5, 1732–1737, doi:10.3762/bjnano.5.183

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  • serum for 24 h and a series of aqueous γ-Fe2O3 colloids were added to reach concentrations of 100, 50, 25, 12.5 and 6 µL colloid per mL of fresh cultural medium. The cells were grown with the nanoparticles for 72 h until a confluent monolayer of the cells was obtained. Consequently, 15 μL of MTT dye (5
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Published 08 Oct 2014

Ionic liquid-assisted formation of cellulose/calcium phosphate hybrid materials

  • Ahmed Salama,
  • Mike Neumann,
  • Christina Günter and
  • Andreas Taubert

Beilstein J. Nanotechnol. 2014, 5, 1553–1568, doi:10.3762/bjnano.5.167

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  • instrument is 0.3%. Acknowledgements We thank Ms. C. Pilz-Allen (funded by the Biomaterials Department, MPI of Colloids and Interfaces) for generously supporting us with the cell culture experiments. We thank the University of Potsdam for financial support. A.S. acknowledges a Channel Fellowship awarded by
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Published 16 Sep 2014
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