21,705 results match your criteria Micron Oxford England : 1993[Journal]


Patterning Multicolor Hybrid Perovskite Films via Top-Down Lithography.

ACS Nano 2019 Feb 22. Epub 2019 Feb 22.

Lead halide perovskites have attracted great attention due to their excellent optoelectronic properties, with great progress being made in their performance as light emitting diodes (LEDs), photodiodes, and solar cells. Demonstrating large scale, high-resolution patterning of perovskites is a key enabling step to unlock their full potential for a range of optoelectronic applications. However, the development of a successful top-down lithography fabrication procedure has so far been hampered by the incompatibility of perovskite films with the solvents used during lithographic processes. Read More

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http://dx.doi.org/10.1021/acsnano.8b09592DOI Listing
February 2019

Ordered Domains and Microwave Properties of Sub-micron Structured Ba(ZnTa)O₃ Ceramics Obtained by Spark Plasma Sintering.

Materials (Basel) 2019 Feb 20;12(4). Epub 2019 Feb 20.

State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China.

The degree of Zn and Ta ions ordering could play an important role in the dielectric loss in Ba(ZnTa)O₃ (BZT) ceramics. However, the influence of the grain size of Ba(B'B″)O₃ ceramics with nano or sub-micron grains on the ordering domains structure is still not clear. In the present paper, highly dense (~98%) BZT microwave dielectric ceramics with homogeneous sub-micron structure (~330 nm) were prepared through spark plasma sintering (SPS). Read More

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http://dx.doi.org/10.3390/ma12040638DOI Listing
February 2019

Near-Surface Material Phases and Microstructure of Scandate Cathodes.

Materials (Basel) 2019 Feb 20;12(4). Epub 2019 Feb 20.

Department of Chemical and Materials Engineering, University of Kentucky, 177 F. Paul Anderson Tower, Lexington, KY 40506, USA.

Scandate cathodes that were fabricated using the liquid-solid process and that exhibited excellent emission performance were characterized using complementary state-of-the-art electron microscopy techniques. Sub-micron BaAl₂O₄ particles were observed on the surfaces and edges of tungsten particles, as seen in cross-section samples extracted from the scandate cathode surface regions. Although several BaAl₂O₄ particles were observed to surround smaller Sc₂O₃ nanoparticles, no chemical mixing of the two oxides was detected, and in fact the distinct oxide phases were separately verified by chemical analysis and also by 3D elemental tomography. Read More

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http://dx.doi.org/10.3390/ma12040636DOI Listing
February 2019

An assessment of the ability of submicron- and micron-size silicone oil droplets in dropped pre-fillable syringes to invoke early- and late-stage immune responses.

J Pharm Sci 2019 Feb 18. Epub 2019 Feb 18.

U-Medico Inc., 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Exploratory Research Center on Life and Living Systems (ExCELLS), National, Institutes of Natural Sciences, Japan, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi, 444-8787, Japan. Electronic address:

A number of biopharmaceuticals are available as lyophilized formulations along with a prefilled syringe (PFS) containing water for injection (WFI). Submicron- and micron-size droplets of lubricating silicone oil (SO) applied to the inner surface of the PFS barrel might migrate into the WFI, to which protein pharmaceuticals can adsorb, potentially inducing an immune response. In the present study, we subjected siliconized cyclo-olefin polymer (COP) PFSs filled with WFI to dropping stress in order to simulate actual shipping conditions as well as evaluated the risk associated with the released SO droplets. Read More

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http://dx.doi.org/10.1016/j.xphs.2019.02.002DOI Listing
February 2019

EyeSAM: graph-based localization and mapping of retinal vasculature during intraocular microsurgery.

Int J Comput Assist Radiol Surg 2019 Feb 21. Epub 2019 Feb 21.

The Robotics Institute, Carnegie Mellon University, Pittsburgh, PA, 15213, USA.

Purpose: Robot-assisted intraocular microsurgery can improve performance by aiding the surgeon in operating on delicate micron-scale anatomical structures of the eye. In order to account for the eyeball motion that is typical in intraocular surgery, there is a need for fast and accurate algorithms that map the retinal vasculature and localize the retina with respect to the microscope.

Methods: This work extends our previous work by a graph-based SLAM formulation using a sparse incremental smoothing and mapping (iSAM) algorithm. Read More

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http://dx.doi.org/10.1007/s11548-019-01925-1DOI Listing
February 2019

A softening laminar electrode for recording single unit activity from the rat hippocampus.

Sci Rep 2019 Feb 20;9(1):2321. Epub 2019 Feb 20.

Research Group for Implantable Microsystems, Faculty of Information Technology & Bionics, Pázmány Péter Catholic University, Budapest, Hungary.

Softening neural implants that change their elastic modulus under physiological conditions are promising candidates to mitigate neuroinflammatory response due to the reduced mechanical mismatch between the artificial interface and the brain tissue. Intracortical neural probes have been used to demonstrate the viability of this material engineering approach. In our paper, we present a robust technology of softening neural microelectrode and demonstrate its recording performance in the hippocampus of rat subjects. Read More

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http://dx.doi.org/10.1038/s41598-019-39835-6DOI Listing
February 2019

Size effect of polystyrene microplastics on sorption of phenanthrene and nitrobenzene.

Ecotoxicol Environ Saf 2019 Feb 18;173:331-338. Epub 2019 Feb 18.

Department of Plant, Soil and Microbial Sciences, and Environmental Science and Policy Program, Michigan State University, East Lansing, MI 48824, United States.

Microplastics can have strong sorption capacity for many contaminants, thus greatly influencing the fate, transport and bioavailability of those contaminants in the environment. However, the effect of particle size on contaminant sorption by microplastics is still poorly understood. This study investigated the sorption of phenanthrene and nitrobenzene to micron-, submicron- and nano- sized polystyrene microplastics of 170 µm, 102 µm, 50 µm, 30 µm, 800 nm, 235 nm or 50 nm. Read More

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http://dx.doi.org/10.1016/j.ecoenv.2019.02.037DOI Listing
February 2019

Estimating Ground-Level Concentrations of Multiple Air Pollutants and Their Health Impacts in the Huaihe River Basin in China.

Int J Environ Res Public Health 2019 Feb 16;16(4). Epub 2019 Feb 16.

State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.

Air pollutants existing in the environment may have negative impacts on human health depending on their toxicity and concentrations. Remote sensing data enable researchers to map concentrations of various air pollutants over vast areas. By combining ground-level concentrations with population data, the spatial distribution of health impacts attributed to air pollutants can be acquired. Read More

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http://dx.doi.org/10.3390/ijerph16040579DOI Listing
February 2019

Universal scaling of polygonal desiccation crack patterns.

Phys Rev E 2019 Jan;99(1-1):012802

Department of Physics, Emory University, Atlanta, Georgia 30322, USA.

Polygonal desiccation crack patterns are commonly observed in natural systems. Despite their quotidian nature, it is unclear whether similar crack patterns which span orders of magnitude in length scales share the same underlying physics. In thin films, the characteristic length of polygonal cracks is known to monotonically increase with the film thickness; however, existing theories that consider the mechanical, thermodynamic, hydrodynamic, and statistical properties of cracking often lead to contradictory predictions. Read More

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http://dx.doi.org/10.1103/PhysRevE.99.012802DOI Listing
January 2019

Surface-tracked scanning ion conductance microscopy: A novel imaging technique for measuring topography-correlated transmembrane ion transport through porous substrates.

Micron 2019 Feb 8;120:57-65. Epub 2019 Feb 8.

Department of Mechanical and Aerospace Engineering, The Ohio State University, 201 W 19th Ave, Columbus, OH 43210, United States. Electronic address:

Ion transport through porous substrates is ubiquitous in biological and synthetic materials, and fundamental for chemical separation, drug delivery and bio-sensing. Contemporary imaging techniques for simultaneously characterizing topography and ion transport through porous substrates are limited in range and resolution. In this paper, we demonstrate 'surface-tracked scanning ion conductance microscopy' as a technique to image topography of a porous substrate and simultaneously measure voltage-driven transmembrane ion transport. Read More

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http://dx.doi.org/10.1016/j.micron.2019.01.015DOI Listing
February 2019

A Pickering Emulsion-Derived Liquid-Solid Hybrid Catalyst for Bridging Homogeneous and Heterogeneous Catalysis.

J Am Chem Soc 2019 Feb 18. Epub 2019 Feb 18.

We describe a novel method to prepare a liquid-solid hybrid catalyst via interfacial growth of a porous silica crust around Pickering emulsion droplets, which allowed us to overcome the current limitations of both homogeneous and heterogeneous catalysts. The inner micron-scaled liquid (for example, ionic liquids) pool of the resultant catalyst can host free homogeneous molecular catalysts or enzymes to create a true homogeneous catalysis environment. The porous silica crust of the hybrid catalyst has excellent stability, which makes it amenable to packing directly in fixed-bed reactors for continuous flow catalysis. Read More

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http://dx.doi.org/10.1021/jacs.8b11860DOI Listing
February 2019

Polarization induced contrast X-ray fluorescence at submicrometer resolution reveals nanometer apatite crystal orientations across entire tooth sections.

Biomed Opt Express 2019 Jan 3;10(1):18-28. Epub 2018 Dec 3.

Department for Operative and Preventive Dentistry, Charité - Universitätsmedizin Berlin, Aßmannshauser Str. 4-6 Berlin 14197, Germany.

For biomedical research, successful imaging of calcified microstructures often relies on absorption differences between features, or on employing dies with selective affinity to areas of interest. When texture is concerned, e.g. Read More

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http://dx.doi.org/10.1364/BOE.10.000018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6363201PMC
January 2019

Microstructural evolution of a dual hardening steel during heat treatment.

Micron 2019 Feb 10;120:48-56. Epub 2019 Feb 10.

Montanuniversität Leoben, Department of Physical Metallurgy and Materials Testing, Franz-Josef-Straße 18, 8700, Leoben, Austria.

Dual hardening steels combine precipitation of both secondary hardening carbides and intermetallic phases in a martensitic matrix. Due to this combination, the carbon content necessary to achieve high hardness levels can be reduced, resulting in a decreased amount of large and embrittling carbides. In this study, the influence of different heat treatments on microstructure evolution and secondary hardness is investigated. Read More

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http://dx.doi.org/10.1016/j.micron.2019.02.004DOI Listing
February 2019

Impact of a Heat Shock Protein Impurity on the Immunogenicity of Biotherapeutic Monoclonal Antibodies.

Pharm Res 2019 Feb 15;36(4):51. Epub 2019 Feb 15.

School of Biological Sciences, Faculty of Biology Medicine and Health Manchester Academic Health Science Centre, The University of Manchester, Michael Smith Building Oxford Road, Manchester, M13 9PT, UK.

Purpose: Anti-drug antibodies can impair the efficacy of therapeutic proteins and, in some circumstances, induce adverse health effects. Immunogenicity can be promoted by aggregation; here we examined the ability of recombinant mouse heat shock protein 70 (rmHSP70) - a common host cell impurity - to modulate the immune responses to aggregates of two therapeutic mAbs in mice.

Methods: Heat and shaking stress methods were used to generate aggregates in the sub-micron size range from two human mAbs, and immunogenicity assessed by intraperitoneal exposure in BALB/c mice. Read More

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http://dx.doi.org/10.1007/s11095-019-2586-7DOI Listing
February 2019

Micron resolution, high-fidelity three-dimensional vascular optical imaging phantoms.

J Biomed Opt 2019 Feb;24(2):1-4

Wellcome Trust-EPSRC Centre for Interventional and Surgical Sciences, London, United Kingdom.

Microscopic and mesoscale optical imaging techniques allow for three-dimensional (3-D) imaging of biological tissue across millimeter-scale regions, and imaging phantom models are invaluable for system characterization and clinical training. Phantom models that replicate complex 3-D geometries with both structural and molecular contrast, with resolution and lateral dimensions equivalent to those of imaging techniques (<20  μm), have proven elusive. We present a method for fabricating phantom models using a combination of two-photon polymerization (2PP) to print scaffolds, and microinjection of tailored tissue-mimicking materials to simulate healthy and diseased tissue. Read More

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http://dx.doi.org/10.1117/1.JBO.24.2.020502DOI Listing
February 2019

Bose-Einstein condensation of photons in an erbium-ytterbium co-doped fiber cavity.

Nat Commun 2019 Feb 14;10(1):747. Epub 2019 Feb 14.

The Andrew & Erna Viterbi Faculty of Electrical Engineering, Technion, 32000, Haifa, Israel.

Bose-Einstein condensation (BEC) is a special many-boson phenomenon that was observed in atomic particles at ultra-low temperatures. Later, BEC was also shown for non-atomic bosons, such as photons. Those experiments were usually done in micron-size cavities, where the power (particle number) was varied, and not the temperature, until condensation was reached. Read More

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http://dx.doi.org/10.1038/s41467-019-08527-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6376030PMC
February 2019

Electronic structure of multiferroic BiFeO: Electron energy-loss spectroscopy and first-principles study.

Micron 2019 Jan 30;120:43-47. Epub 2019 Jan 30.

School of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, PR China. Electronic address:

The electronic structure of BiFeO has been investigated by using electron energy loss spectrum and first-principle calculations. Assignments of the individual interband transitions have been accomplished by comparing the interband transition energy with the calculated PDOS. The DOS is mainly divided into two regions, the hybridized region of O 2p with Fe 3p in the valence band and that of O 2p hybridized with Bi 6p in the conduction band. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S09684328193000
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http://dx.doi.org/10.1016/j.micron.2019.01.012DOI Listing
January 2019
1 Read

Cryo-analytical STEM of frozen, aqueous dispersions of nanoparticles.

Micron 2019 Jan 31;120:35-42. Epub 2019 Jan 31.

School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK. Electronic address:

In situ characterisation of nanoparticle dispersion and surface coatings is required to further our understanding of the behaviour of nanoparticles in aqueous suspension. Using cryogenic transmission electron microscopy (cryo-TEM) it is possible to analyse a nanoparticle suspension in the frozen, hydrated state; however, this analysis is often limited to imaging alone. This work demonstrates the first use of analytical scanning TEM (STEM) in the examination of nanoparticles captured in a layer of vitreous ice. Read More

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http://dx.doi.org/10.1016/j.micron.2019.01.013DOI Listing
January 2019
1 Read

Factors affecting electron beam damage in calcite nanoparticles.

Micron 2019 Jan 29;120:25-34. Epub 2019 Jan 29.

School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK. Electronic address:

We report electron fluence thresholds for the degradation of calcite nanoparticles under electron irradiation by both conventional and scanning TEM (CTEM and STEM), using time resolved phase contrast imaging and EDX spectroscopy at both 80 kV and 300 kV accelerating voltages. We show that the degradation pathway of calcite involves disruption of the crystal lattice with the evolution of pores and transformation to calcium oxide and carbon dioxide. Depending on irradiation conditions (CTEM or STEM), the calcium oxide formed can be either amorphous or crystalline, with the formation of the latter apparently being hindered by hydrocarbon contamination build up in STEM. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S09684328183045
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http://dx.doi.org/10.1016/j.micron.2019.01.011DOI Listing
January 2019
2 Reads

Combined microscopy and spectroscopy techniques to characterize a fossilized feather with minimal damage to the specimen.

Micron 2019 Jan 31;120:17-24. Epub 2019 Jan 31.

Laboratório de Biomineralização, Instituto de Ciências Biológicas, Universidade Federal do Rio de Janeiro, CEP 21941-902, Brazil. Electronic address:

The study of fossil feathers has been revitalized in the last few decades and has contributed significantly to paleontological studies of dinosaurs and birds. Specific morphological and physicochemical characteristics of the microscale structures of feathers and the protein keratin are key targets when preserved during the fossilization process. Keratin is a fibrous protein that composes some hard tissues such as hair, nails and feathers. Read More

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http://dx.doi.org/10.1016/j.micron.2019.01.016DOI Listing
January 2019

An All-Optical Excitonic Switch Operated in the Liquid and Solid Phases.

ACS Nano 2019 Feb 20. Epub 2019 Feb 20.

Micron School of Materials Science & Engineering , Boise State University , Boise , Idaho 83725 , United States.

The excitonic circuitry found in photosynthetic organisms suggests an alternative to electronic circuits, but the assembly of optically active molecules to fabricate even simple excitonic devices has been hampered by the limited availability of suitable molecular scale assembly technologies. Here we have designed and operated a hybrid all-optical excitonic switch comprised of donor/acceptor chromophores and photochromic nucleotide modulators assembled with nanometer scale precision using DNA nanotechnology. The all-optical excitonic switch was operated successfully in both liquid and solid phases, exhibiting high ON/OFF switching contrast with no apparent cyclic fatigue through nearly 200 cycles. Read More

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http://dx.doi.org/10.1021/acsnano.8b07504DOI Listing
February 2019

Diffusion-limited dissolution of calcium carbonate in a hydrogel.

Soft Matter 2019 Feb 13. Epub 2019 Feb 13.

University of Bordeaux, Laboratory of the Future (CNRS/SOLVAY), 178, avenue du Docteur Schweitzer, 33600 Pessac, France.

In the process of fabricating porous polymers, we use dispersed calcite as a sacrificial solid that generates porosity after dissolution. To do this, we trap calcite particles in a hydrogel, dissolve the particles and dry the hydrogel; here, we describe in detail the dissolution kinetics. We prepare PEGDA [poly(ethylene glycol)-diacrylate] water solutions loaded with micron-sized calcite particles (containing mostly calcium carbonate) up to about 30% volume fraction; these dispersions are photo-polymerized into hydrogels as flat and shallow monoliths with a typical thickness of ≈100 μm and a lateral extent on the order of 1 cm. Read More

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http://dx.doi.org/10.1039/c8sm02625dDOI Listing
February 2019

Modeling Airflow and Particle Deposition in a Human Acinar Region.

Comput Math Methods Med 2019 14;2019:5952941. Epub 2019 Jan 14.

Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA.

The alveolar region, encompassing millions of alveoli, is the most vital part of the lung. However, airflow behavior and particle deposition in that region are not fully understood because of the complex geometrical structure and intricate wall movement. Although recent investigations using 3D computer simulations have provided some valuable information, a realistic analysis of the air-particle dynamics in the acinar region is still lacking. Read More

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http://dx.doi.org/10.1155/2019/5952941DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6348927PMC
January 2019

Template-Free Construction of Highly Ordered Monolayered Fluorescent Protein Nanosheets: A Bioinspired Artificial Light-Harvesting System.

ACS Nano 2019 Feb 14. Epub 2019 Feb 14.

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry , Jilin University , 2699 Qianjin Street , Changchun 130012 , China.

Using biological materials for light-harvesting applications has attracted considerable attention in recent years. Such materials provide excellent environmental compatibility and often exhibit superior properties over synthetic materials. Herein, inspired by the outstanding energy transfer performance in coelenterates, we constructed a template-free, highly ordered two-dimensional light-harvesting system by covalent-induced coassembly of EBFP2 (donor) and EGFP (acceptor), in which the fluorescent chromophores were well distributed and adopted a fixed orientation. Read More

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http://dx.doi.org/10.1021/acsnano.8b08021DOI Listing
February 2019

High-speed imaging of ice nucleation in water proves the existence of active sites.

Sci Adv 2019 Feb 1;5(2):eaav4316. Epub 2019 Feb 1.

School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK.

Understanding how surfaces direct nucleation is a complex problem that limits our ability to predict and control crystal formation. We here address this challenge using high-speed imaging to identify and quantify the sites at which ice nucleates in water droplets on the two natural cleavage faces of macroscopic feldspar substrates. Our data show that ice nucleation only occurs at a few locations, all of which are associated with micron-size surface pits. Read More

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http://dx.doi.org/10.1126/sciadv.aav4316DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358314PMC
February 2019

The interactions between wheat starch and Mesona chinensis polysaccharide: A study using solid-state NMR.

Food Chem 2019 Jun 22;284:67-72. Epub 2019 Jan 22.

School of Food and Nutrition, Massey Institute of Food Science and Technology, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand. Electronic address:

The interaction between wheat starch and Mesona chinensis polysaccharide (MCP) was found to change the molecular mobility of the water and carbohydrate populations in starch-MCP gels, when measured using proton and carbon nuclear magnetic resonance relaxation methods. The starch and MCP mobilities appeared similar at a micron scale. However, at a distance of less than 5 nm could they be detected as having separate mobility states, indicating close interaction between the starch and MCP. Read More

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http://dx.doi.org/10.1016/j.foodchem.2019.01.098DOI Listing
June 2019
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Description of the third instar larva of the stag beetle Prismognathus dauricus Motschulsky, 1860 (Coleoptera: Scarabaeoidea: Lucanidae) using electron microscopy.

Micron 2019 Feb 4;120:10-16. Epub 2019 Feb 4.

Key Laboratory of Economic and Applied Entomology of Liaoning Province, College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, 110866, China. Electronic address:

Lucanidae have long received great attention for their adults. However, differentiating between the larvae of stag beetles is difficult and remains unsatisfactorily resolved due to the microscopic features separating groups. In the current study, the larvae of Prismognathus dauricus Motschulsky, 1860 were investigated using light and scanning electron microscopy. Read More

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http://dx.doi.org/10.1016/j.micron.2019.02.001DOI Listing
February 2019

Review: New insights into optimizing chemical and 3D surface structures of carbon electrodes for neurotransmitter detection.

Anal Methods 2019 Jan 21;11(3):247-261. Epub 2018 Dec 21.

Dept. of Chemistry, University of Virginia, Charlottesville, VA 22901.

The carbon-fiber microelectrode has been used for decades as a neurotransmitter sensor. Recently, new strategies have been developed for making carbon electrodes, including using carbon nanomaterials or pyrolyzing photoresist etched by nanolithography or 3D printing. This review summarizes how chemical and 3D surface structures of new carbon electrodes are optimized for neurotransmitter detection. Read More

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http://dx.doi.org/10.1039/C8AY02472CDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6366673PMC
January 2019

Techniques for robot-aided intraocular surgery using monocular vision.

Int J Rob Res 2018 Jul 13;37(8):931-952. Epub 2018 Jul 13.

Robotics Institute, Carnegie Mellon University, Pittsburgh, USA.

This paper presents techniques for robot-aided intraocular surgery using monocular vision in order to overcome erroneous stereo reconstruction in an intact eye. We propose a new retinal surface estimation method based on a structured-light approach. A handheld robot known as the Micron enables automatic scanning of a laser probe, creating projected beam patterns on the retinal surface. Read More

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http://dx.doi.org/10.1177/0278364918778352DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6366647PMC

Low dose scanning transmission electron microscopy of organic crystals by scanning moiré fringes.

Micron 2019 Feb 1;120:1-9. Epub 2019 Feb 1.

School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.

In the pharmaceutical industry, it is important to determine the effects of crystallisation and processes, such as milling, on the generation of crystalline defects in formulated products. Conventional transmission electron microscopy and scanning transmission electron microscopy (STEM) can be used to obtain information on length scales unobtainable by other techniques, however, organic crystals are extremely susceptible to electron beam damage. This work demonstrates a bright field (BF) STEM method that can increase the information content per unit specimen damage by the use of scanning moiré fringes (SMFs). Read More

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http://dx.doi.org/10.1016/j.micron.2019.01.014DOI Listing
February 2019
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In-situ/operando X-ray characterization of metal hydrides.

Chemphyschem 2019 Feb 8. Epub 2019 Feb 8.

Lawrence Livermore National Laboratory, Advanced Light Sources, 94720, Berkeley, UNITED STATES.

In this article, the capabilities of soft and hard X-ray techniques, including X-ray absorption (XAS), soft X-ray emission spectroscopy (XES), resonant inelastic soft X-ray scattering (RIXS), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD), and their application to solid-state hydrogen storage materials are presented. These characterization tools are indispensable for interrogating hydrogen storage materials at the relevant length scales of fundamental interest, which range from the micron scale to nanometer dimensions.Since nanostructuring is now well established as an avenue to improve the thermodynamics and kinetics of hydrogen release and uptake, due to properties such as reduced mean free paths of transport and increased surface-to-volume ratio, it becomes of critical importance to explicitly identify structure-property relationships on the nanometer scale. Read More

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http://dx.doi.org/10.1002/cphc.201801185DOI Listing
February 2019
1 Read

Comparison of Different Home/Commercial Washing Strategies for Ten Typical Pesticide Residue Removal Effects in Kumquat, Spinach and Cucumber.

Int J Environ Res Public Health 2019 Feb 6;16(3). Epub 2019 Feb 6.

Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100193, China.

Home processing can reduce pesticide residues in agricultural products, and the common forms of treatment include washing, peeling, blanching, and cooking. In this study, the removal effects of tap water, micron calcium solution, alkaline electrolyzed water (AlEW), ozone water, active oxygen, and sodium bicarbonate on 10 typical pesticide residues in kumquat, cucumber, and spinach were investigated. The residue magnitudes were determined by chromatography⁻tandem mass spectrometry (GC-MS/MS, LC-MS/MS), combined with the QuEChERS pretreatment method. Read More

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http://dx.doi.org/10.3390/ijerph16030472DOI Listing
February 2019
2.063 Impact Factor

Iatrogenic foreign body in urinary bladder: Holmium laser vs. Ceramic, and the winner is….

Int Braz J Urol 2019 Feb 10;45. Epub 2019 Feb 10.

Department of Urology, IRCCS-INRCA, Ancona, Italy.

Introduction: Urological surgery is estimated to be the third most common cause of iatrogenic-retained foreign bodies (1).

Presentation: A 76-year old man was undergoing a transurethral resection of bladder tumor with a 26-Ch continuous flow resectoscope (Karl Storz, Germany). Before starting resection, a detachment of resectoscope sheath tip was noted. Read More

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http://dx.doi.org/10.1590/S1677-5538.IBJU.2018.0229DOI Listing
February 2019
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Non-Gaussian, non-ergodic, and non-Fickian diffusion of tracers in mucin hydrogels.

Soft Matter 2019 Feb 8. Epub 2019 Feb 8.

Institute for Physics & Astronomy, University of Potsdam, 14476 Potsdam-Golm, Germany.

Native mucus is polymer-based soft-matter material of paramount biological importance. How non-Gaussian and non-ergodic is the diffusive spreading of pathogens in mucus? We study the passive, thermally driven motion of micron-sized tracers in hydrogels of mucins, the main polymeric component of mucus. We report the results of the Bayesian analysis for ranking several diffusion models for a set of tracer trajectories [C. Read More

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http://dx.doi.org/10.1039/c8sm02096eDOI Listing
February 2019

Comparison of Micro-Computed Tomography and Clinical Computed Tomography Protocols for Visualization of Nasal Cartilage Before Surgical Planning for Rhinoplasty.

JAMA Facial Plast Surg 2019 Feb 7. Epub 2019 Feb 7.

Department of Otolaryngology-Head and Neck Surgery, University of Washington, Seattle.

Importance: There is no imaging standard to model nasal cartilage for the planning of rhinoplasty procedures. Preoperative visualization of cartilage may improve objective evaluation of nasal deformities, surgical planning, and surgical reconstruction.

Objectives: To evaluate the feasibility of visualizing nasal cartilage using high resolution micro-computed tomography (CT) compared with the criterion standard of pathologic findings in a cadaveric specimen and to evaluate its accuracy compared with various clinical CT protocols. Read More

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http://dx.doi.org/10.1001/jamafacial.2018.1931DOI Listing
February 2019

Carboxylic acids accelerate acidic environment-mediated nanoceria dissolution.

Nanotoxicology 2019 Feb 7:1-21. Epub 2019 Feb 7.

a Department of Pharmaceutical Sciences , University of Kentucky , Lexington , KY , USA.

Ligands that accelerate nanoceria dissolution may greatly affect its fate and effects. This project assessed the carboxylic acid contribution to nanoceria dissolution in aqueous, acidic environments. Nanoceria has commercial and potential therapeutic and energy storage applications. Read More

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https://www.tandfonline.com/doi/full/10.1080/17435390.2018.1
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http://dx.doi.org/10.1080/17435390.2018.1553251DOI Listing
February 2019
2 Reads

Raman Microscopy and Bone.

Methods Mol Biol 2019 ;1914:651-659

Arthritis and Musculoskeletal Medicine, Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK.

Raman microscopy is a nondestructive technique requiring minimal sample preparation that can be used to measure the chemical properties of the mineral and collagen parts of bone simultaneously. Modern Raman instruments contain the necessary components and software to acquire the standard information required in most bone studies. The spatial resolution of the technique is about a micron. Read More

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http://dx.doi.org/10.1007/978-1-4939-8997-3_35DOI Listing
January 2019
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Hitchhiking on chromosomes: A persistence strategy shared by diverse selfish DNA elements.

Plasmid 2019 Feb 3. Epub 2019 Feb 3.

Department of Molecular Biosciences, UT Austin, Austin, TX TX7 8712, USA. Electronic address:

An underlying theme in the segregation of low-copy bacterial plasmids is the assembly of a 'segrosome' by DNA-protein and protein-protein interactions, followed by energy-driven directed movement. Analogous partitioning mechanisms drive the segregation of host chromosomes as well. Eukaryotic extra-chromosomal elements, exemplified by budding yeast plasmids and episomes of certain mammalian viruses, harbor partitioning systems that promote their physical association with chromosomes. Read More

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http://dx.doi.org/10.1016/j.plasmid.2019.01.004DOI Listing
February 2019

Large-scale micron-order 3D surface correlative chemical imaging of ancient Roman concrete.

PLoS One 2019 6;14(2):e0210710. Epub 2019 Feb 6.

Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America.

There has been significant progress in recent years aimed at the development of new analytical techniques for investigating structure-function relationships in hierarchically ordered materials. Inspired by these technological advances and the potential for applying these approaches to the study of construction materials from antiquity, we present a new set of high throughput characterization tools for investigating ancient Roman concrete, which like many ancient construction materials, exhibits compositional heterogeneity and structural complexity across multiple length scales. The detailed characterization of ancient Roman concrete at each of these scales is important for understanding its mechanics, resilience, degradation pathways, and for making informed decisions regarding its preservation. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0210710PLOS
February 2019

Creation of a unique architectural structure of bioactive glass sub-micron particles incorporated in a polycaprolactone/gelatin fibrous mat; characterization, bioactivity and cellular evaluations.

J Biomed Mater Res A 2019 Feb 6. Epub 2019 Feb 6.

Department of Cellular Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran.

In this study, submicron, monodispersed, spherical bioactive glass (BG) particles with a mean diameter of 720 ± 80 nm were produced through sol-gel process. The prepared BG particles were successfully incorporated into 70/30 (W/W) ratio of polycaprolactone / gelatin (PCL/GT) nanofibrous mats (250 ± 60 nm) through electrospinning to obtain a unique architectural structure for the first time. To enhance biodegradation and stability of the scaffolds, crosslinking using gluteraldehyde was applied. Read More

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http://dx.doi.org/10.1002/jbm.a.36649DOI Listing
February 2019
3 Reads

Intrinsic valley Hall transport in atomically thin MoS.

Nat Commun 2019 Feb 5;10(1):611. Epub 2019 Feb 5.

Department of Physics and the Center for Quantum Materials, the Hong Kong University of Science and Technology, Hong Kong, China.

Electrons hopping in two-dimensional honeycomb lattices possess a valley degree of freedom in addition to charge and spin. In the absence of inversion symmetry, these systems were predicted to exhibit opposite Hall effects for electrons from different valleys. Such valley Hall effects have been achieved only by extrinsic means, such as substrate coupling, dual gating, and light illuminating. Read More

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http://www.nature.com/articles/s41467-019-08629-9
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http://dx.doi.org/10.1038/s41467-019-08629-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6363770PMC
February 2019
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Correction to Coaxial Carbon Nanotube Supported TiO@MoO@Carbon Core-Shell Anode for Ultrafast and High-Capacity Sodium Ion Storage.

ACS Nano 2019 Feb 6. Epub 2019 Feb 6.

Micron School of Materials Science and Engineering , Boise State University , Boise , Idaho 83725 , United States.

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http://dx.doi.org/10.1021/acsnano.9b00496DOI Listing
February 2019

Synthesis of Catalytic Nanoporous Metallic Thin Films on Polymer Membranes.

Ind Eng Chem Res 2018 Mar 5;57(12):4420-4429. Epub 2018 Mar 5.

Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA.

Composite membranes were produced with a metallic thin film forming the upper layer of the composite on a porous polymer support. Commercially available membranes were used as supports with both micron and nanometer scale pores. Alloy films of ~110 nm thickness were deposited via magnetron sputtering to produce the top layer of the composite. Read More

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http://dx.doi.org/10.1021/acs.iecr.8b00053DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6358282PMC

O/W Pickering emulsions stabilized by cocoa powder: Role of the emulsification process and of composition parameters.

Food Res Int 2019 Feb 12;116:755-766. Epub 2018 Sep 12.

Univ. Bordeaux, CBMN, UMR 5248, 33600 Pessac, France; CNRS, CBMN, UMR 5248, 33600 Pessac, France; Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France. Electronic address:

We fabricated oil-in-water emulsions stabilized by delipidated commercial cocoa powder. The emulsions were characterized in terms of droplets and particles size distribution and interfacial coverage by cocoa powder by developing methods to separate droplets from adsorbed and unadsorbed cocoa particles. Three different processes were compared for their ability to produce fine and stable emulsions: rotor/stator turbulent mixing, sonication and microfluidization. Read More

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http://dx.doi.org/10.1016/j.foodres.2018.09.009DOI Listing
February 2019
1 Read

Low cost additive manufacturing of microneedle masters.

3D Print Med 2019 Feb 4;5(1). Epub 2019 Feb 4.

Merck & Co., Inc, Kenilworth, NJ, USA.

Purpose: Microneedle patches are arrays of tiny needles that painlessly pierce the skin to deliver medication into the body. Biocompatible microneedles are usually fabricated via molding of a master structure. Microfabrication techniques used for fabricating these master structures are costly, time intensive, and require extensive expertise to control the structure's geometry of the structure, despite evidence that microneedle geometry is a key design parameter. Read More

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http://dx.doi.org/10.1186/s41205-019-0039-xDOI Listing
February 2019
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Modular soft robotic microdevices for dexterous biomanipulation.

Lab Chip 2019 Feb 4. Epub 2019 Feb 4.

Institute of Mechanical Engineering and Institute of Bioengineering, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

We present a methodology for building biologically inspired, soft microelectromechanical systems (MEMS) devices. Our strategy combines several advanced techniques including programmable colloidal self-assembly, light-harvesting with plasmonic nanotransducers, and in situ polymerization of compliant hydrogel mechanisms. We synthesize optomechanical microactuators using a template-assisted microfluidic approach in which gold nanorods coated with thermoresponsive poly(N-isopropylmethacrylamide) (pNIPMAM) polymer function as nanoscale building blocks. Read More

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http://xlink.rsc.org/?DOI=C8LC01200H
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http://dx.doi.org/10.1039/c8lc01200hDOI Listing
February 2019
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Breakage of vesicles in a simple shear flow.

Soft Matter 2019 Feb 4. Epub 2019 Feb 4.

Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India.

The breakage of micron-size SOPC lipid vesicles in an aqueous suspension was studied in a simple shear flow over a range of shear rates (1000 s-1 to 4000 s-1). Evolution of the vesicle size distribution with time was determined using optical microscopy. The number average vesicle diameter was found to reduce continuously with time; at the highest shear rate (4000 s-1), the reduction was 38% after 6 h of shearing. Read More

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http://dx.doi.org/10.1039/c8sm01501eDOI Listing
February 2019

Principles and Applications of Nucleic Acid Strand Displacement Reactions.

Chem Rev 2019 Feb 4. Epub 2019 Feb 4.

Physics Department , TU München , 85748 Garching , Germany.

Dynamic DNA nanotechnology, a subfield of DNA nanotechnology, is concerned with the study and application of nucleic acid strand-displacement reactions. Strand-displacement reactions generally proceed by three-way or four-way branch migration and initially were investigated for their relevance to genetic recombination. Through the use of toeholds, which are single-stranded segments of DNA to which an invader strand can bind to initiate branch migration, the rate with which strand displacement reactions proceed can be varied by more than 6 orders of magnitude. Read More

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http://dx.doi.org/10.1021/acs.chemrev.8b00580DOI Listing
February 2019

Kv2 channels create endoplasmic reticulum / plasma membrane junctions: a brief history of Kv2 channel subcellular localization.

Channels (Austin) 2019 Dec;13(1):88-101

a Molecular, Cellular and Integrative Neurosciences Graduate Program , Colorado State University , Fort Collins , CO , USA.

The potassium channels Kv2.1 and Kv2.2 are widely expressed throughout the mammalian brain. Read More

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http://dx.doi.org/10.1080/19336950.2019.1568824DOI Listing
December 2019

On the Performance of Confined Deep Eutectic Solvents and Ionic Liquids for Separations of Carbon Dioxide from Methane: Molecular Dynamics Simulations.

Langmuir 2019 Feb 4. Epub 2019 Feb 4.

Classical molecular dynamics simulations were used to investigate the performance of slit graphite and titania (rutile) pores of 5.2 nm in width, partially and completely filled with deep eutectic solvents (DESs) or ionic liquids (ILs), for gas separations of a carbon dioxide-methane mixture of 5:95 molar ratio and temperatures and pressures on the order of 318 K and 100 bar. The DES studied were ethaline and levuline (1:2 molar mixtures of choline chloride with ethylene glycol or levulinic acid), and the IL considered was 1-n-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [bmim+][NTf2-]. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b03990DOI Listing
February 2019
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