21,846 results match your criteria Micron Oxford England : 1993[Journal]


Cell Encapsulation in Soft, Anisometric Poly(ethylene) Glycol Microgels Using a Novel Radical-Free Microfluidic System.

Small 2019 Apr 16:e1900692. Epub 2019 Apr 16.

DWI-Leibniz Institute for Interactive Materials, Forckenbeckstrasse 50, 52074, Aachen, Germany.

Complex 3D artificial tissue constructs are extensively investigated for tissue regeneration. Frequently, materials and cells are delivered separately without benefitting from the synergistic effect of combined administration. Cell delivery inside a material construct provides the cells with a supportive environment by presenting biochemical, mechanical, and structural signals to direct cell behavior. Read More

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http://dx.doi.org/10.1002/smll.201900692DOI Listing

Electrophoretic transport and dynamic deformation of bio-vesicles.

Electrophoresis 2019 Apr 16. Epub 2019 Apr 16.

Department of Mechanical Engineering, Southern Methodist University, Dallas, TX.

Study of the deformation dynamics of cells and other sub-micron vesicles, such as virus and neurotransmitter vesicles are necessary to understand their functional properties. This mechanical characterization can be done by submerging the vesicle in a fluid medium and deforming it with a controlled electric field, which is known as electrodeformation. Electrodeformation of biological and artificial lipid vesicles is directly influenced by the vesicle and surrounding media properties and geometric factors. Read More

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http://dx.doi.org/10.1002/elps.201900025DOI Listing

Isothermal Crystallization Kinetics and Morphology of Double Crystalline PCL/PBS Blends Mixed with a Polycarbonate/MWCNTs Masterbatch.

Polymers (Basel) 2019 Apr 15;11(4). Epub 2019 Apr 15.

Polymat and Polymer Science and Technology Department, Faculty of Chemistry, University of the Basque Country UPV/EHU, Paseo Manuel de Lardizabal 3, Donostia-San Sebastián 20018, Spain.

In this work, the 70/30 and 30/70 w/w polycaprolactone (PCL)/polybutylene succinate (PBS) blends and their corresponding PCL/PBS/(polycarbonate (PC)/multiwalled carbon nanotubes (MWCNTs) masterbatch) nanocomposites were prepared in a twin-screw extruder. The nanocomposites contained 1.0 and 4. Read More

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http://dx.doi.org/10.3390/polym11040682DOI Listing

On the Enantioselective HPLC Separation Ability of Sub-2 µm Columns: Chiralpak IG-U and ID-U.

Molecules 2019 Apr 2;24(7). Epub 2019 Apr 2.

Chirality Program, Faculty of Science and Technology, University of Canberra, ACT 2601, Australia.

Silica with a particle size of 3-5 µm has been widely used as selector backbone material in 10-25 cm HPLC chiral columns. Yet, with the availability of 1.6 µm particles, shorter, high-efficiency columns practical for minute chiral separations are possible to fabricate. Read More

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http://dx.doi.org/10.3390/molecules24071287DOI Listing

Nanostructures, faceting, and splitting in nano- to yocto-liter liquid droplets.

Nano Lett 2019 Apr 15. Epub 2019 Apr 15.

Contrary to everyday experience, where all liquid droplets assume rounded, near-spherical shapes, the temperature-tuning of liquid droplets to faceted polyhedral shapes, and to spontaneous splitting, has been recently demonstrated in oil-in-water emulsions. However, the elucidation of the mechanism driving these surprising effects, as well as their many potential applications, ranging from faceted nanoparticle synthesis, through new industrial emulsification routes, to controlled-release drug delivery within the human body, have been severely hampered by the micron-scale resolution of the light microscopy employed to date in all in situ studies. Thus, the thickness of the interfacially-frozen crystalline monolayer, suggested to drive these effects, could not be directly measured, and the low limit on the droplet size still showing these effects remained unknown. Read More

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http://pubs.acs.org/doi/10.1021/acs.nanolett.9b00594
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http://dx.doi.org/10.1021/acs.nanolett.9b00594DOI Listing
April 2019
1 Read

Simple fabrication of layered halide perovskite platelets and enhanced photoluminescence from mechanically exfoliated flakes.

Nanoscale 2019 Apr 15. Epub 2019 Apr 15.

Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

Rapid progress on the fabrication of lead halide perovskite crystals has led to highly promising performance in optoelectronic devices, particularly from three-dimensional crystals. Recently, these efforts have been extended to layered perovskite structures, motivated in part by their good environmental stability. Furthermore, layered perovskites represent a nanocrystal system with micron-size extensions and strong confinement in one dimension that is highly appealing for studying fundamental photophysics. Read More

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http://dx.doi.org/10.1039/c9nr00638aDOI Listing

Bacterial chromosome organization. I. Crucial role of release of topological constraints and molecular crowders.

J Chem Phys 2019 Apr;150(14):144908

IISER-Pune, Dr. Homi Bhaba Road, Pune 411008, India.

We showed in our previous studies that just 3% cross-links (CLs), at special points along the contour of the bacterial DNA, help the DNA-polymer to get organized at micron length scales [T. Agarwal et al., J. Read More

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http://dx.doi.org/10.1063/1.5058214DOI Listing

Fabrication of inverse-opal lysozyme-imprinted polydopamine/polypyrrole microspheres with near-infrared-light-controlled release property.

J Colloid Interface Sci 2019 Apr 8;548:37-47. Epub 2019 Apr 8.

CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China. Electronic address:

The combination of the molecular imprinting technology and porous materials is a promising way to obtain high-efficient selective adsorption and separation materials for bioactive macromolecules. In this work, we developed a novel approach to prepare near-infrared (NIR)-light-response inverse-opal lysozyme (Lyz)-imprinted polydopamine/polypyrrole (IO-PDA/PPy-MIP) composite microspheres using micron-sized SiO colloidal crystal microspheres as the sacrificed template. The pore size of the IO-PDA/PPy-MIP microspheres can be tuned from 200 to 800 nm by the size of silica nanoparticles which self-assemble to form the template SiO colloidal crystal microspheres. Read More

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http://dx.doi.org/10.1016/j.jcis.2019.04.021DOI Listing

An ImageJ tool for simplified post-treatment of TEM phase contrast images (SPCI).

Micron 2019 Mar 28;121:90-98. Epub 2019 Mar 28.

Univ. Grenoble Alpes, CNRS, Grenoble INP, SIMaP, F-38000 Grenoble, France.

Tools for taking advantage of phase-contrast in transmission electron microscopy are of great interest for both biological and material sciences studies as shown by the recent use of phase plates and the development of holography. Nevertheless, these tools most often require highly qualified experts and access to advanced equipment that can only be considered after preliminary investigations. Here we propose to address this issue by the development of an ImageJ plugin that allow the retrieval of a phase image by simple numerical treatment applied to two defocused images. Read More

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http://dx.doi.org/10.1016/j.micron.2019.01.006DOI Listing

Beam-induced oxidation of mixed-valent Fe (oxyhydr)oxides (green rust) monitored by STEM-EELS.

Micron 2019 Feb 10. Epub 2019 Feb 10.

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

Analytical transmission electron microscopy (TEM) is often used to investigate morphologies, crystal structures, chemical compositions and oxidation states of highly reactive mixed-valent mineral phases. Of prime interest, due to its potential role in toxic metal remediation, is green rust sulphate (GR) an Fe-Fe layered double hydroxide. In this study, we quantified the effects that TEM analysis has on GR in order to ensure the measured material properties are a result of synthesis and reaction kinetics, and not due to sample preparation and analysis technique. 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.2019.02.002DOI Listing
February 2019
1 Read

Four millimeter spherical rotors spinning at 28 kHz with double-saddle coils for cross polarization NMR.

J Magn Reson 2019 Apr 1;303:1-6. Epub 2019 Apr 1.

Department of Chemistry, Washington University in St. Louis, St. Louis, MO 63130, USA. Electronic address:

Spherical rotors in magic angle spinning (MAS) experiments have significant advantages over traditional cylindrical rotors including simplified spinning implementation, easy sample exchange, more efficient microwave coupling for dynamic nuclear polarization (DNP), and feasibility of downscaling to access higher spinning frequencies. Here, we implement spherical rotors with 4 mm outside diameter (o.d. Read More

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http://dx.doi.org/10.1016/j.jmr.2019.03.006DOI Listing

Is the Zero Reynolds Number Approximation Valid for Ciliary Flows?

Phys Rev Lett 2019 Mar;122(12):124502

Laboratory for Aero and Hydrodynamics, Delft University of Technology, 2628CD Delft, Netherlands.

Stokes equations are commonly used to model the hydrodynamic flow around cilia on the micron scale. The validity of the zero Reynolds number approximation is investigated experimentally with a flow velocimetry approach based on optical tweezers, which allows the measurement of periodic flows with high spatial and temporal resolution. We find that beating cilia generate a flow, which fundamentally differs from the stokeslet field predicted by Stokes equations. Read More

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https://link.aps.org/doi/10.1103/PhysRevLett.122.124502
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http://dx.doi.org/10.1103/PhysRevLett.122.124502DOI Listing
March 2019
2 Reads

Analysis of Trabecular Microstructure and Vascular Distribution of Capital Femoral Epiphysis Relevant to Legg-Calve-Perthes Disease.

J Orthop Res 2019 Apr 12. Epub 2019 Apr 12.

Texas Scottish Rite Hospital for Children, Dallas, TX.

Legg-Calve-Perthes disease is characterized by capital femoral epiphyseal collapse which occurs more reliably in the anterior quadrant than the more weight-bearing lateral quadrant. The purpose of this study was to determine whether there is a vascular or microstructural predisposition for anterior femoral epiphyseal collapse in Perthes Disease. Thirty-two cadaveric proximal femoral epiphyses from 17 subjects (age 4-14 years old) underwent micro-computed tomography at 10-micron resolution. Read More

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http://dx.doi.org/10.1002/jor.24311DOI Listing

Patterning of ZnO Quantum Dot and PMMA Hybrids with a Solvent Assisted Technique.

Langmuir 2019 Apr 11. Epub 2019 Apr 11.

Imprinting of nanoparticle-polymer hybrids has been a challenging task due to the agglomeration of nanoparticles, especially for metal oxides because of their highly hydrophilic and polar surfaces. We hereby report an effective sub-micron patterning process of ZnO quantum dot-PMMA hybrids with a solvent-assisted lithographic technique. Feature sizes down to 250 nm have been achieved with a ZnO content up to 50 vol%, about 10 times higher than the literature reported inorganic contents. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.9b00256
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http://dx.doi.org/10.1021/acs.langmuir.9b00256DOI Listing
April 2019
1 Read

Multicolor multiscale brain imaging with chromatic multiphoton serial microscopy.

Nat Commun 2019 04 10;10(1):1662. Epub 2019 Apr 10.

Laboratory for Optics and Biosciences, Ecole polytechnique, CNRS, INSERM, IP Paris, Palaiseau, 91128, France.

Large-scale microscopy approaches are transforming brain imaging, but currently lack efficient multicolor contrast modalities. We introduce chromatic multiphoton serial (ChroMS) microscopy, a method integrating one-shot multicolor multiphoton excitation through wavelength mixing and serial block-face image acquisition. This approach provides organ-scale micrometric imaging of spectrally distinct fluorescent proteins and label-free nonlinear signals with constant micrometer-scale resolution and sub-micron channel registration over the entire imaged volume. Read More

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http://dx.doi.org/10.1038/s41467-019-09552-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6458155PMC

High Capacity Nano-Sized Carbon Spheres for Lithium-Ion Battery Anode Materials.

Polymers (Basel) 2019 Apr 9;11(4). Epub 2019 Apr 9.

State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China.

A one-step hydrothermal method is reported for synthesizing carbon spheres (Cs) with sucrose as the carbon resource for the anode materials in lithium-ion batteries (LIBs). Firstly, the influences of synthesis temperature and time on particle size and the morphology of the Cs were researched. Then, modified carbon spheres (MCs) were synthesized with some surfactants, such as hexadecyl trimethyl ammonium bromide (CTAB) and polyvinyl alcohol (PVA). Read More

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https://www.mdpi.com/2073-4360/11/4/645
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http://dx.doi.org/10.3390/polym11040645DOI Listing
April 2019
12 Reads

Measurement of carrier lifetime in micron-scaled materials using resonant microwave circuits.

Nat Commun 2019 04 9;10(1):1625. Epub 2019 Apr 9.

Electrical and Computer Engineering, Microelectronics Research Center, University of Texas at Austin, Austin, Texas, 78758, USA.

The measurement of minority carrier lifetimes is vital to determining the material quality and operational bandwidth of a broad range of optoelectronic devices. Typically, these measurements are made by recording the temporal decay of a carrier-concentration-dependent material property following pulsed optical excitation. Such approaches require some combination of efficient emission from the material under test, specialized collection optics, large sample areas, spatially uniform excitation, and/or the fabrication of ohmic contacts, depending on the technique used. Read More

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http://dx.doi.org/10.1038/s41467-019-09602-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6456730PMC

Green Strategies for Molecularly Imprinted Polymer Development.

Polymers (Basel) 2018 Mar 12;10(3). Epub 2018 Mar 12.

LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.

Molecular imprinting is a powerful technology to create artificial receptors within polymeric matrices. Although it was reported for the first time by Polyakov, eighty-four years ago, it remains, nowadays, a very challenging research area. Molecularly imprinted polymers (MIPs) have been successfully used in several applications where selective binding is a requirement, such as immunoassays, affinity separation, sensors, and catalysis. Read More

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http://dx.doi.org/10.3390/polym10030306DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6415187PMC

Microplastics accumulate on pores in seed capsule and delay germination and root growth of the terrestrial vascular plant Lepidium sativum.

Chemosphere 2019 Mar 31;226:774-781. Epub 2019 Mar 31.

Institute of Environmental Sciences, Leiden University, P.O. Box 9518, 2300, RA Leiden, the Netherlands. Electronic address:

The impacts of nano- and microplastics (<100 nm and <5 mm, respectively) on terrestrial systems is to the present largely unexplored. Plastic particles are likely to accumulate in these systems primarily by the application of sewage sludge. The aim of the current study was to investigate the effects of three sizes of plastic particles (50, 500, and 4800 nm) on a terrestrial plant (cress; Lepidium sativum), using a standardized 72 h bioassay. Read More

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http://dx.doi.org/10.1016/j.chemosphere.2019.03.163DOI Listing

Mechanical contact spectroscopy: characterizing nanoscale adhesive contacts via thermal forces.

Langmuir 2019 Apr 9. Epub 2019 Apr 9.

Adhesion of micro- and nanoparticles to solid substrates immersed in liquids is a problem of great scientific and technological importance. Yet, quantitative characterization of such nanoscale adhesive contacts without rupturing them still presents a major experimental challenge. In this article, we introduce mechanical contact spectroscopy (MCS), an experimental technique for non-destructive probing of particle adhesion in liquid environments. Read More

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http://dx.doi.org/10.1021/acs.langmuir.8b04074DOI Listing

Tying Together Multiscale Calculations for Charge Transport in P3HT: Structural Descriptors, Morphology, and Tie-Chains.

Polymers (Basel) 2018 Dec 7;10(12). Epub 2018 Dec 7.

Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83705, USA.

Evaluating new, promising organic molecules to make next-generation organic optoelectronic devices necessitates the evaluation of charge carrier transport performance through the semi-conducting medium. In this work, we utilize quantum chemical calculations (QCC) and kinetic Monte Carlo (KMC) simulations to predict the zero-field hole mobilities of ∼100 morphologies of the benchmark polymer poly(3-hexylthiophene), with varying simulation volume, structural order, and chain-length polydispersity. Morphologies with monodisperse chains were generated previously using an optimized molecular dynamics force-field and represent a spectrum of nanostructured order. Read More

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http://dx.doi.org/10.3390/polym10121358DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401820PMC
December 2018

Optimization and Validation of Efficient Models for Predicting Polythiophene Self-Assembly.

Polymers (Basel) 2018 Nov 26;10(12). Epub 2018 Nov 26.

Micron School of Materials Science and Engineering, Boise State University, Boise, ID 83705, USA.

We develop an optimized force-field for poly(3-hexylthiophene) (P3HT) and demonstrate its utility for predicting thermodynamic self-assembly. In particular, we consider short oligomer chains, model electrostatics and solvent implicitly, and coarsely model solvent evaporation. We quantify the performance of our model to determine what the optimal system sizes are for exploring self-assembly at combinations of state variables. Read More

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http://dx.doi.org/10.3390/polym10121305DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401914PMC
November 2018

Heat Dissipation in Epoxy/Amine-Based Gradient Composites with Alumina Particles: A Critical Evaluation of Thermal Conductivity Measurements.

Polymers (Basel) 2018 Oct 11;10(10). Epub 2018 Oct 11.

Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria.

For the design of the next generation of microelectronic packages, thermal management is one of the key aspects and must be met by the development of polymers with enhanced thermal conductivity. While all polymer classes show a very low thermal conductivity, this shortcoming can be compensated for by the addition of fillers, yielding polymer-based composite materials with high thermal conductivity. The inorganic fillers, however, are often available only in submicron- and micron-scaled dimensions and, consequently, can sediment during the curing reaction of the polymer matrix. Read More

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http://dx.doi.org/10.3390/polym10101131DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6403572PMC
October 2018

Toughening of Epoxy Resin: The Effect of Water Jet Milling on Worn Tire Rubber Particles.

Polymers (Basel) 2019 Mar 20;11(3). Epub 2019 Mar 20.

Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3., H-1111 Budapest, Hungary.

In this work a cycloaliphatic amine-cured epoxy (EP) resin was modified by micron-scale rubber particles (RP). Nominal RP, in sizes of 200 and 600 µm respectively, were produced using worn truck tires and ultra-high-pressure water jet cutting. The RP were dispersed into the EP resin using different mixing techniques (mechanical, magnetic, and ultrasonic stirring) prior to the introduction of the amine hardener. Read More

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http://dx.doi.org/10.3390/polym11030529DOI Listing

Synthesis of an Aqueous Self-Matting Acrylic Resin with Low Gloss and High Transparency via Controlling Surface Morphology.

Polymers (Basel) 2019 Feb 13;11(2). Epub 2019 Feb 13.

State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China.

This paper reports on a novel, film-forming acrylic polymer resin that exhibits low-gloss surface and high transparency via controlling film morphology at sub-micron roughness levels. Such microstructure is controlled by means of the copolymerization process increasing the allyl methacrylate (AMA) crosslinker content from 0 to 0.4 wt %. Read More

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http://dx.doi.org/10.3390/polym11020322DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419221PMC
February 2019

Impact Energy Release Characteristics of PTFE/Al/CuO Reactive Materials Measured by a New Energy Release Testing Device.

Polymers (Basel) 2019 Jan 16;11(1). Epub 2019 Jan 16.

College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China.

Metal/polymer reactive materials have been studied and applied in a wide range of ways in recent years. This type of material is insensitive under normal conditions but reacts violently and releases a large amount of chemical energy under high-speed impact or high strain rate loading conditions. Compared with conventional explosives, it has better mechanical properties, and its unit mass energy is several times that of TNT. Read More

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http://www.mdpi.com/2073-4360/11/1/149
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http://dx.doi.org/10.3390/polym11010149DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6401817PMC
January 2019
4 Reads

[FUNCTIONAL STATUS OF THE VISUAL ORGAN DURING PREECLAMPSIA].

Georgian Med News 2019 Feb(287):39-44

Sumy State University, Medical Institute, Sumy State University, Department of Surgery and Oncology; Department of Obstetrics anf Gynecology; Academic and Research Institute of Law, Department of Administrative, Economic Law and Economic Security, Ukraine.

The purpose of this research is to study the effect of preeclampsia of pregnant women on the functional status of the visual organ. The research study was made on 77 pregnant women (154 eyes) from 17 to 43 years old. Based on the analysis of the research results, during uncomplicated pregnancy and mild preeclampsia we found no significant changes in the foveolar retinal thickness and macular retinal volume both during various trimesters of pregnancy and postpartum. Read More

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February 2019
2 Reads

Collagen reorganization in cartilage under strain probed by polarization sensitive second harmonic generation microscopy.

J R Soc Interface 2019 Jan;16(150):20180611

3 Institut Fresnel, CNRS, Aix Marseille Univ, Centrale Marseille , 13013 Marseille , France.

Type II collagen fibril diameters in cartilage are beneath the diffraction limit of optical microscopy, which makes the assessment of collagen organization very challenging. In this work we use polarization sensitive second harmonic generation (P-SHG) imaging to map collagen organization in articular cartilage, addressing in particular its behaviour under strain and changes which occur in osteoarthritis. P-SHG yields two parameters, molecular order and orientation, which provide measures of the degree of organization both at the molecular scale (below the diffraction limit) and above a few hundred nanometres (at the image pixel size). Read More

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http://dx.doi.org/10.1098/rsif.2018.0611DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6364654PMC
January 2019

Targeted Drug Delivery to Upper Airways Using a Pulsed Aerosol Bolus and Inhaled Volume Tracking Method.

Flow Turbul Combust 2019 Jan 2;102(1):73-87. Epub 2018 May 2.

Department of Biomedical Engineering, Technion - Israel Institute of Technology, Haifa, Israel.

The pulmonary route presents an attractive delivery pathway for topical treatment of lung diseases. While significant progress has been achieved in understanding the physical underpinnings of aerosol deposition in the lungs, our ability to target or confine the deposition of inhalation aerosols to specific lung regions remains meagre. Here, we present a novel inhalation proof-of-concept for regional targeting in the upper airways, quantitatively supported by computational fluid dynamics (CFD) simulations of inhaled micron-sized particles (i. Read More

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http://dx.doi.org/10.1007/s10494-018-9927-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6445363PMC
January 2019

Inhibition of autophagy impairs acrosome and mitochondrial crista formation during spermiogenesis in turtle: Ultrastructural evidence.

Micron 2019 Apr 1;121:84-89. Epub 2019 Apr 1.

MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Jiangsu Province, 210095, China. Electronic address:

Autophagy is a subcellular process that is extensively involved in spermiogenesis. In this study, we observed ultrastructural malformation of acrosome and mitochondrial cristae during the spermiogenesis of Chinese soft-shelled turtle due to the inhibition of autophagy. Autophagy was blocked with 3-MA, and the inhibition of autophagy was confirmed through western blot analysis. Read More

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http://dx.doi.org/10.1016/j.micron.2019.03.006DOI Listing
April 2019
1.988 Impact Factor

Shape-fitting collagen-PLA composite promotes osteogenic differentiation of porcine adipose stem cells.

J Mech Behav Biomed Mater 2019 Mar 22;95:21-33. Epub 2019 Mar 22.

Dept. of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Dept. of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA. Electronic address:

Craniomaxillofacial bone defects can occur as a result of congenital, post-oncologic, and high-energy impact conditions. The scale and irregularity of such defects motivate new biomaterials to promote regeneration of the damaged bone. We have recently described a mineralized collagen scaffold capable of instructing stem cell osteogenic differentiation and new bone infill in the absence of traditional osteogenic supplements. Read More

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http://dx.doi.org/10.1016/j.jmbbm.2019.03.017DOI Listing

Growth of nanowire arrays from micron-feature templates.

Nanotechnology 2019 Apr 5. Epub 2019 Apr 5.

Ecole Polytechnique Federale de Lausanne, Lausanne, SWITZERLAND.

Here, we present a two-step annealing procedure to imprint nanofeatures on SiO2 starting from metallic microfeatures. The first annealing transforms the microfeatures into gold nanoparticles and the second imprints these nanoparticles into the SiO2 layer with nanometric control. The resulting nanohole arrays show a high ensemble uniformity. Read More

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http://dx.doi.org/10.1088/1361-6528/ab1699DOI Listing
April 2019
1 Read

Removal of heavy metals by aged zero-valent iron from flue-gas-desulfurization brine under high salt and temperature conditions.

J Hazard Mater 2019 Mar 27;373:572-579. Epub 2019 Mar 27.

School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. Electronic address:

To achieve zero liquid discharge, the flue-gas-desulfurization (FGD) wastewater at coal-fired power plants can be concentrated into brine through thermal evaporation to maximize water reuse; however, the hot brine generated requires further treatment prior to disposal. To address this need, this study investigates the performance of aged, micron-sized zero-valent iron (ZVI) for heavy metal removal in simulated and real FGD hot brines, which was scarcely studied previously. The effects of temperature, pH, total dissolved solids, ZVI dosage, major cations, nitrate and sulfate on the reactivity of ZVI in the brines were evaluated. Read More

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http://dx.doi.org/10.1016/j.jhazmat.2019.03.117DOI Listing

Monitoring bioturbation by a small marine polychaete using microcomputed tomography.

Micron 2019 Mar 26;121:77-83. Epub 2019 Mar 26.

Marine Biology Department, Federal Fluminense University, Niterói, RJ, Brazil.

Bioturbation is one of the principle biological processes involved in transporting particles and solutes within sediments, which contributes to the maintenance of biodiversity. In muddy polluted environments, bioturbation may increase pollutant flux at the water-sediment interface, thereby enhancing contaminant bioavailability. The behavior of organisms dictates bioturbation, and gallery shape influences the magnitude of solute transport. Read More

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http://dx.doi.org/10.1016/j.micron.2019.03.004DOI Listing

Evaluation of pinhole collimator materials for micron-resolution ex-vivo SPECT.

Phys Med Biol 2019 Apr 4. Epub 2019 Apr 4.

Radiation Detection and Matter, Technische Universiteit Delft, Department of Applied Sciences, Mekelweg 15, 2629 JB, Delft, Delft, NETHERLANDS.

Pinhole collimation is widely recognized for offering superior resolution-sensitivity trade-off in SPECT imaging of small subjects. The newly developed EXIRAD-3D autoradiography technique (MILabs B.V. Read More

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http://dx.doi.org/10.1088/1361-6560/ab1618DOI Listing

Fluctuations in cell cycle, morphology and metabolism of Anemia phyllitidis gametophytes are the most important hallmarks of GA-induced antheridiogenesis.

Micron 2019 Mar 25;121:66-76. Epub 2019 Mar 25.

The University of Łódź, Faculty of Biology and Environmental Protection, Department of Cytophysiology, Pomorska 141/143, 90-236 Łódź, Poland. Electronic address:

The research object concerns partially explained mechanisms of plant hormone participation in male sex determination in plants, among them in A. phyllitidis gametophytes during GA-induced antheridiogenesis. To provide an explanation of the mechanisms of fluorescence and white-light microscopy, cytophotometric, autoradiographic and spectrophotometic methods were used to study cell cycle, the number of nucleoli, the amount of DiOC-stained IMN/ER, in which endoplasmic reticulum (ER) constitutes the main part, and its distribution as well as the amounts of proteins and chlorophylls and activities of acidic (Ac) and basic (Ba) phosphatases (Phases). Read More

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http://dx.doi.org/10.1016/j.micron.2019.03.005DOI Listing

Imaging photoinduced surface potentials on hybrid perovskites by real-time Scanning Electron Microscopy.

Micron 2019 Mar 20;121:53-65. Epub 2019 Mar 20.

Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, Italy; CNST@PoliMi, Istituto Italiano di Tecnologia (IIT), Via Giovanni Pascoli 70/3, Milano, Italy. Electronic address:

We introduce laser-assisted Time-Resolved SEM (TR-SEM), joining Scanning Electron Microscopy and laser light excitation, to probe the long-term temporal evolution of optically excited charge distributions at the surface of Metal Ammonium Lead Triiodide (MAPbI) hybrid perovskite thin films. Laser-assisted TR-SEM relies on the optically induced local modification of Secondary Electron (SE) detection yield to provide mapping of photoexcited potentials and charge dynamics at surfaces, and qualifies as a complementary approach to near-field probe microscopies and nonlinear photoemission spectroscopies for photovoltage measurements. Real-time imaging of evolving field patterns are provided on timescales compatible with SEM scanning rates, so that temporal resolution in the millisecond range can be ultimately envisaged. Read More

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http://dx.doi.org/10.1016/j.micron.2019.03.002DOI Listing
March 2019
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Comparison of three processes for parenteral nanoemulsion production: ultrasounds, microfluidizer and premix membrane emulsification.

J Pharm Sci 2019 Apr 1. Epub 2019 Apr 1.

Univ Lyon, Universit´e Claude Bernard Lyon 1, CNRS, LAGEP UMR 5007, 43 boulevard du 11 novembre 1918, F-69100, Villeurbanne, France. Electronic address:

Nanoemulsions are of great interest for pharmaceutical applications, including parenteral dosage forms. However, their production is still limited and requires more efficient and adaptive technologies. The more common systems are high-shear homogenization like microfludizers (MF) at industrial scale and ultrasounds at research scale, both based on high energy limiting their application for sensitive drugs. Read More

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http://dx.doi.org/10.1016/j.xphs.2019.03.026DOI Listing
April 2019
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Tuning the wettability of a thin polymer film by gradually changing the geometry of nanoscale pore edges.

Langmuir 2019 Apr 4. Epub 2019 Apr 4.

Controlling wetting of solids by liquids attracts attention because of its scientific and technological importance. In this paper, the wettability of a highly uniform porous polymethyl methacrylate (PMMA) film on a silicon substrate containing a high density of randomly distributed self-similar pores was gradually tuned by changing the shape of nanometric crown-like structures around the pores. Fine tuning the topography of these thin films, was performed by isothermal annealing. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b00467DOI Listing

Sequential Photoactivation of Self-Assembled Monolayers to Direct Cell Adhesion and Migration.

Langmuir 2019 Apr 15. Epub 2019 Apr 15.

Department of Chemistry, Department of Biomedical Engineering, and Department of Cell and Molecular Biology , Northwestern University , Evanston , Illinois 60208 , United States.

Dynamic substrates for cell culture control the spatial and temporal presentation of extracellular matrix ligands that interact with adherent cells. This paper reports a photoactive surface chemistry that can repeatedly activate regions of the substrate for cell adhesion, spreading, and migration. The approach uses self-assembled monolayers presenting the integrin ligand RGD that is caged with a nitrophenyl-based photoprotecting group. Read More

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http://pubs.acs.org/doi/10.1021/acs.langmuir.8b04203
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http://dx.doi.org/10.1021/acs.langmuir.8b04203DOI Listing
April 2019
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Feasibility Study of Mesoporous Silica Particles for Pulmonary Drug Delivery: Therapeutic Treatment with Dexamethasone in a Mouse Model of Airway Inflammation.

Pharmaceutics 2019 Apr 1;11(4). Epub 2019 Apr 1.

Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, 20520 Turku, Finland.

Diseases in the respiratory tract rank among the leading causes of death in the world, and thus novel and optimized treatments are needed. The lungs offer a large surface for drug absorption, and the inhalation of aerosolized drugs are a well-established therapeutic modality for local treatment of lung conditions. Nanoparticle-based drug delivery platforms are gaining importance for use through the pulmonary route. Read More

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http://dx.doi.org/10.3390/pharmaceutics11040149DOI Listing

Evidence for spinodal decomposition in Ti-15Mo quenched alloy using transmission electron microscopy.

Micron 2019 Mar 22;121:43-52. Epub 2019 Mar 22.

Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, 603 102, Kalpakkam, India.

Electron diffraction effect associated with nano-scale periodic modulations observed in a quenched Ti-15 wt%Mo alloy within ω phase forming regime has been investigated in this study by analyzing selected area diffraction patterns and high-resolution phase contrast images. Crystallographic direction of the side bands in electron diffraction associated with the periodic modulation of wavelength 1.3 nm is established as [001] which is an elastically soft direction for the body-centered cubic lattice. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S09684328183024
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http://dx.doi.org/10.1016/j.micron.2019.03.003DOI Listing
March 2019
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A novel phase function describing light scattering of layers containing colloidal nanospheres.

Nanoscale 2019 Apr;11(15):7404-7413

Department of Engineering Sciences, The Ångström Laboratory, Uppsala University, PO Box 534, SE-75121 Uppsala, Sweden.

Light scattering from small particles exhibit unique angular scattering distributions, which are strongly dependent on the radius to wavelength ratio as well as the refractive index contrast between the particles and the surrounding medium. As the concentration of the particles increases, multiple scattering becomes important. This complicates the description of the angular scattering patterns, and in many cases one has to resort to empirical phase functions. Read More

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http://dx.doi.org/10.1039/c9nr01707kDOI Listing

Electrically Conductive CNT Composites at Loadings below Theoretical Percolation Values.

Nanomaterials (Basel) 2019 Mar 29;9(4). Epub 2019 Mar 29.

Department of Mechanical and Aerospace Engineering, Naval Postgraduate School, Monterey, CA 93943, USA.

It is well established that dramatic increases in conductivity occur upon the addition of conductive filler materials to highly resistive polymeric matrices in experimental settings. However, the mechanisms responsible for the observed behavior at low filler loadings, below theoretical percolation limits, of even high aspect ratio fillers such as carbon nanotubes (CNT) are not completely understood. In this study, conductive composites were fabricated using CNT bundles dispersed in epoxy resins at diverse loadings, using different dispersion and curing protocols. Read More

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https://www.mdpi.com/2079-4991/9/4/491
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http://dx.doi.org/10.3390/nano9040491DOI Listing
March 2019
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Direct Three-Dimensional Measurement of Refractive Index via Dual Photon-Phonon Scattering.

Phys Rev Lett 2019 Mar;122(10):103901

Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, USA.

We developed a microscopy technique that can measure the local refractive index without sampling the optical phase delay of the electromagnetic radiation. To do this, we designed and experimentally demonstrated a setup with two colocalized Brillouin scattering interactions that couple to a common acoustic phonon axis; in this scenario, the ratio of Brillouin frequency shifts depends on the refractive index, but not on any other mechanical and/or optical properties of the sample. Integrating the spectral measurement within a confocal microscope, the refractive index is mapped at micron-scale three-dimensional resolution. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.103901DOI Listing

Polarization Oscillations in Birefringent Emitter-Cavity Systems.

Phys Rev Lett 2019 Mar;122(8):083602

University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom.

We present the effects of resonator birefringence on the cavity-enhanced interfacing of quantum states of light and matter, including the first observation of single photons with a time-dependent polarization state that evolves within their coherence time. A theoretical model is introduced and experimentally verified by the modified polarization of temporally long single photons emitted from a ^{87}Rb atom coupled to a high-finesse optical cavity by a vacuum-stimulated Raman adiabatic passage process. Further theoretical investigation shows how a change in cavity birefringence can both impact the atom-cavity coupling and engender starkly different polarization behavior in the emitted photons. Read More

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http://dx.doi.org/10.1103/PhysRevLett.122.083602DOI Listing
March 2019
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[Comparison study on the differential expression of miRNAs in rat pulmonary fibrosis induced by nanosized SiO(2) and microsized SiO(2)].

Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2019 Feb;37(2):81-89

Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.

To explore the correlation between expression level of miRNAs and pulmonary fibrosis on the basis of comparison the differential expression of miRNAs in rat pulmonary fibrosis induced by nano SiO(2) and micron SiO(2). Thirty-six healthy male SD rats weighting 180-220 g were randomly divided into 3 groups. They were instilled intratracheally with 1 ml suspension of saline, 25 mg/ml nanosized SiO(2) and microsized SiO(2) particles and sacrificed at 60 d and 90 d postexposure from each group with six rats. Read More

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http://dx.doi.org/10.3760/cma.j.issn.1001-9391.2019.02.001DOI Listing
February 2019
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Development of a Two-Way Coupled Eulerian-Lagrangian Computational Magnetic Nanoparticle Targeting Model for Pulsatile Flow in a Patient-Specific Diseased Left Carotid Bifurcation Artery.

Cardiovasc Eng Technol 2019 Mar 29. Epub 2019 Mar 29.

Department of Mechanical Engineering, North Carolina Agricultural & Technical State University, Greensboro, NC, USA.

Purpose: The aim of the present work is to present the development of a computational two-way coupled (fluid and particle coupled) magnetic nanoparticle targeting model to investigate the efficacy of magnetic drug targeting (MDT) in a patient-specific diseased left carotid bifurcation artery. MDT of therapeutic agents using multifunctional carrier particles has the potential to provide effective treatment of both cancer and cardiovascular disease by enabling a variety of localized treatment and diagnostic modalities while minimizing side effects.

Methods: A computational model is developed to analyze pulsatile blood flow, particle motion, and particle capture efficiency in a diseased left carotid bifurcation artery using the magnetic properties of magnetite (FeO) and equations describing the magnetic forces acting on particles produced by an external cylindrical electromagnetic coil. Read More

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http://dx.doi.org/10.1007/s13239-019-00411-8DOI Listing

A coupled microscopy approach to assess the nano-landscape of weathering.

Sci Rep 2019 Mar 29;9(1):5377. Epub 2019 Mar 29.

Pacific Northwest National Laboratory, Richland, WA, 99352, USA.

Mineral weathering is a balanced interplay among physical, chemical, and biological processes. Fundamental knowledge gaps exist in characterizing the biogeochemical mechanisms that transform microbe-mineral interfaces at submicron scales, particularly in complex field systems. Our objective was to develop methods targeting the nanoscale by using high-resolution microscopy to assess biological and geochemical drivers of weathering in natural settings. Read More

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http://dx.doi.org/10.1038/s41598-019-41357-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6441011PMC

Polymerization of cubosome and hexosome templates to produce complex microparticle shapes.

J Colloid Interface Sci 2019 Jun 23;546:240-250. Epub 2019 Mar 23.

Complex Fluids Group, School of Chemical Engineering, UNSW Sydney, Sydney 2052, Australia. Electronic address:

Cubic and hexagonal liquid crystalline particles, or cubosomes and hexosomes, are used as templates to polymerize various monomers to produce particles with unique micron-scale geometric shapes. Emulsion droplets containing water, ethanol, and the lipid glyceryl monooleate are suspended in a yield stress fluid and used to produce shapes based on cubic and hexagonal symmetry by slow crystallization. The underlying liquid crystalline ordering of the aqueous lipid system drives symmetric shape formation, while its amphiphilicity allows incorporation of various organic monomers. Read More

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https://linkinghub.elsevier.com/retrieve/pii/S00219797193036
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http://dx.doi.org/10.1016/j.jcis.2019.03.069DOI Listing
June 2019
5 Reads