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https://www.readbyqxmd.com/read/30502315/the-interaction-of-lipid-liganded-gold-clusters-aurora-tm-with-lipid-bilayers
#1
Jesús Sot, Sebastião A Mendanha-Neto, Jon V Busto, Aritz B García-Arribas, Shengrong Li, Stephen W Burgess, Walt A Shaw, David Gil-Carton, Félix M Goñi, Alicia Alonso
Lipid bilayers of different phospholipid compositions have been prepared, in the form of vesicles, or of supported lipid bilayers, and doped with AuroraTM at 0.1 mol%. AuroraTM consists of an Au55 gold nanoparticle (about 1.4 nm in diameter) capped with triphenylphosphine ligands and a single diglyceride (distearoyl glycerol) ligand. Gold nanoparticles have been incorporated in the past inside liposomes, or grafted onto their surfaces, with diagnostic or therapeutic aims. Including the gold nanoparticles in a stable form within the lipid bilayers has serious technical difficulties...
November 28, 2018: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/30496263/poor-extraction-efficiencies-of-polystyrene-nano-and-microplastics-from-biosolids-and-soil
#2
Zhan Wang, Stephen E Taylor, Prabhakar Sharma, Markus Flury
Extraction and quantification of nano- and microplastics from sediments and soils is challenging. Although no standard method has been established so far, flotation is commonly used to separate plastic from mineral material. The objective of this study was to test the efficiency of flotation for the extraction of nano- and microplastics from biosolids and soil. We spiked biosolids and soil samples with polystyrene nano- and microbeads (0.05, 1.0, 2.6, 4.8, and 100 μm diameter). Different extraction methods (w/ and w/o H2O2 digestion) were tested, and plastic beads were separated from mineral particles by flotation in a ZnCl2 solution...
2018: PloS One
https://www.readbyqxmd.com/read/30474686/evaporation-and-morphological-patterns-of-bi-dispersed-colloidal-droplets-on-hydrophilic-and-hydrophobic-surfaces
#3
R Iqbal, B Majhy, Amy Q Shen, A K Sen
Understanding the formation of different morphological patterns depending on the particle size and surface wettability has great relevance in the separation, mixing and concentration of micro/nano particles and biological entities. We report the evaporation and morphological patterns of evaporating bi-dispersed colloidal droplets on hydrophilic and hydrophobic surfaces. To explain the underlying mechanisms of various particle distribution patterns, we propose a phenomenological model that accounts for the drag force, van der Waals and electrostatic interaction forces, and surface tension force acting on the particles...
November 26, 2018: Soft Matter
https://www.readbyqxmd.com/read/30469529/recruitment-of-53bp1-proteins-for-dna-repair-and-persistence-of-repair-clusters-differ-for-cell-types-as-detected-by-single-molecule-localization-microscopy
#4
Elizaveta Bobkova, Daniel Depes, Jin-Ho Lee, Lucie Jezkova, Iva Falkova, Eva Pagacova, Olga Kopecna, Mariia Zadneprianetc, Alena Bacikova, Elena Kulikova, Elena Smirnova, Tatiana Bulanova, Alla Boreyko, Evgeny Krasavin, Frederik Wenz, Felix Bestvater, Georg Hildenbrand, Michael Hausmann, Martin Falk
DNA double stranded breaks (DSBs) are the most serious type of lesions introduced into chromatin by ionizing radiation. During DSB repair, cells recruit different proteins to the damaged sites in a manner dependent on local chromatin structure, DSB location in the nucleus, and the repair pathway entered. 53BP1 is one of the important players participating in repair pathway decision of the cell. Although many molecular biology details have been investigated, the architecture of 53BP1 repair foci and its development during the post-irradiation time, especially the period of protein recruitment, remains to be elucidated...
November 22, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/30417802/atom-probe-compositional-analysis-of-interphase-precipitated-nano-sized-alloy-carbide-in-multiple-microalloyed-low-carbon-steels
#5
Yongjie Zhang, Goro Miyamoto, Tadashi Furuhara
The composition of nano-sized alloy carbides formed by interphase precipitation in V-Nb and V-Ti multiple microalloyed low-carbon steels is analyzed by using three-dimensional atom probe. Carbide-forming alloying elements including V, Nb, and Ti, are simultaneously precipitated from the early stage of isothermal treatment, whose atoms are uniformly distributed in the carbide particles, even after prolonged holding. Cluster analysis by the maximum separation method, with parameters optimized using different methods, is carried out to extract alloy carbides from matrix...
November 12, 2018: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/30401881/super-resolution-imaging-using-nano-bells
#6
Rafael Fuentes-Domínguez, Fernando Pérez-Cota, Shakila Naznin, Richard J Smith, Matt Clark
In this paper we demonstrate a new scheme for optical super-resolution, inspired, in-part, by PALM and STORM. In this scheme each object in the field of view is tagged with a signal that allows them to be detected separately. By doing this we can identify and locate each object separately with significantly higher resolution than the diffraction limit. We demonstrate this by imaging nanoparticles significantly smaller than the optical resolution limit. In this case the "tag" we have used is the frequency of vibration of nanoscale "bells" made of metallic nanoparticles whose acoustic vibrational frequency is in the multi-GHz range...
November 6, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30398246/partitioning-of-nanoscale-particles-on-a-heterogeneous-multicomponent-lipid-bilayer
#7
Kai Yang, Ran Yang, Xiaodong Tian, Kejie He, Seth Leon Filbrun, Ning Fang, Yuqiang Ma, Bing Yuan
Cell membrane-based sorting and trafficking of nanoscale particles (NPs) are fundamental processes in many cellular activities such as endocytosis, signaling and virus infection; however, the regulation mechanism of these behaviors is still poorly understood. In this work, partitioning of NPs into different lipid phases (i.e., liquid-ordered and liquid-disordered phases) on a ternary lipid bilayer, as well as the influence of NP perturbations on the phase separation of the bilayer, is investigated by using coarse-grained molecular dynamics simulations...
November 6, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30383062/near-surface-microrheology-reveals-dynamics-and-viscoelasticity-of-soft-matter
#8
Wei Liu, Xiangjun Gong, To Ngai, Chi Wu
The development of experimental techniques able to probe the microscale viscoelastic properties of soft matter over a broad time scale is essential to uncover the physics that govern their behavior. Herein, we report the development of a microrheology technique that can determine the near-surface dynamics and viscoelastic behaviors of soft matter like polymer solution/gels and colloidal dispersions. Our approach combines a magnetic-field-induced stimulator with total internal reflection microscopy (TIRM) to apply mechanical loading (∼pN) to a micro-sized probe particle and capture its axial displacement near the surface with nano-scaled sensitivity...
November 1, 2018: Soft Matter
https://www.readbyqxmd.com/read/30361675/development-and-single-dose-clinical-pharmacokinetics-investigation-of-novel-zein-assisted-alpha-lipoic-acid-nanoencapsulation-of-vardenafil
#9
Osama A A Ahmed
The aim of this study was to utilize the biocompatibility of the natural ingredients zein and alpha lipoic acid (ALA) as a novel nanosphere matrix formulation that encapsulates vardenafil (VRD) for improved drug delivery and bioavailability. Three formulations were prepared using zein: ALA ratio of 1:1, 2:1 and 3:1 by liquid-liquid phase separation method. Physicochemical characterization and in vitro diffusion evaluation were carried out for the prepared formulations. A single dose clinical pharmacokinetic study was carried out for the selected formulation...
October 25, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30360185/separation-of-halloysite-nano-tubes-hnts-by-homogenization-of-quartz-contaminated-kaolins
#10
Jing Ming Zhao, Jeong Ho Chang, Youn Ki Lee, Kyu Hong Hwang, Jong Kook Lee
Natural halloysite kaolin contains a lot of impurities such as quartz phases and varies in morphology and size during their formation in the earth. So to utilize as a new type of natural nano material, removing quartz impurities from kaolin clays without scathe the tube morphologies are necessary. So to remove quartz impurities from kaolin by forming a well deflocculated aqueous slip without fracturing the morphology of tubes, the slip of homogenized halloysite clay was recovered by adding polyvalent metallic cations and anionic polyelectrolyte flocculants simultaneously to selectively flocculate the mixture of quartz and halloysite, whereby the halloysite particles form floes and the tubular halloysite remains in suspensions...
February 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30322093/direct-transformation-of-metallized-paper-into-al-si-nano-rod-and-al-nano-particles-using-thermal-micronizing-technique
#11
Zahra Karbalaei Mirza Shahrbabaki, Farshid Pahlevani, Narjes Gorjizadeh, Rumana Hossain, Mohammad Bagher Ghasemian, Vaibhav Gaikwad, Veena Sahajwalla
The abundant application of metallized paper and the quick growth of their wastes lead to the removal of a huge amount of valuable resources from economic cycle. In this work, for the first-time, the thermal micronizing technique has been used to directly transform the metallized paper wastes to Al-Si nano-rod and Al nano-particles for use as the input in different manufacturing sectors such as additive manufacturing or composite fabrication. Structure of metallized paper has been investigated using FT-IR analysis and first-principle plane-wave calculation...
October 12, 2018: Materials
https://www.readbyqxmd.com/read/30308359/removal-of-acetylsalicylate-and-methyl-theobromine-from-aqueous-environment-using-nano-photocatalyst-wo-3-tio-2-g-c-3-n-4-composite
#12
M B Tahir, M Sagir, K Shahzad
Highly efficient, visible light-driven and a novel ternary hybrid photocatalyst WO3 -TiO2 -g-C3 N4 with robust stabilities and versatile properties has been synthesized through facile hydrothermal method. This study considers the photo-degradation of aspirin (acetylsalicylate) and caffeine (methyl-theobromine) via photocatalysts (WO3 , WO3 /TiO2, and WO3 /TiO2 /g-C3 N4 (WTCN) composite) under visible-light irradiation. The SEM and TEM images show the formation of WO3 nanoparticles with orthorhombic structure and average particle size of 65 nm...
February 5, 2019: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30280347/assessment-of-elemental-composition-and-properties-of-copper-smelter-affected-dust-and-its-nano-and-micron-size-fractions
#13
EDITORIAL
Mikhail S Ermolin, Petr S Fedotov, Alexandr I Ivaneev, Vasily K Karandashev, Andrey A Burmistrov, Yury G Tatsy
A comprehensive approach has been developed to the assessment of composition and properties of atmospherically deposited dust in the area affected by a copper smelter. The approach is based on the analysis of initial dust samples, dynamic leaching of water soluble fractions in a rotating coiled column (RCC) followed by the determination of recovered elements and characterization of size, morphology and elemental composition of nano-, submicron, and micron par ticles of dust separated using field-flow fractionation in a RCC...
October 3, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30240952/a-systematic-electron-microscopic-study-on-the-uptake-of-barium-sulphate-nano-submicro-microparticles-by-bone-marrow-derived-phagocytosing-cells
#14
V Sokolova, K Loza, T Knuschke, J Heinen-Weiler, H Jastrow, M Hasenberg, J Buer, A M Westendorf, M Gunzer, M Epple
Nanoparticles can act as transporters for synthetic molecules and biomolecules into cells, also in immunology. Antigen-presenting cells like dendritic cells are important targets for immunotherapy in nanomedicine. Therefore, we have used primary murine bone marrow-derived phagocytosing cells (bmPCs), i.e. dendritic cells and macrophages, to study their interaction with spherical barium sulphate particles of different size (40 nm, 420 nm, and 1 µm) and to follow their uptake pathway. Barium sulphate is chemically and biologically inert (no dissolution, no catalytic effects), i...
October 15, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/30238947/assembly-of-cellulose-nanocrystals-in-a-levitating-drop-probed-by-time-resolved-small-angle-x-ray-scattering
#15
Yingxin Liu, Michael Agthe, Michaela Salajková, Korneliya Gordeyeva, Valentina Guccini, Andreas Fall, Germán Salazar-Alvarez, Christina Schütz, Lennart Bergström
Assembly of bio-based nano-sized particles into complex architectures and morphologies is an area of fundamental interest and technical importance. We have investigated the assembly of sulfonated cellulose nanocrystals (CNC) dispersed in a shrinking levitating aqueous drop using time-resolved small angle X-ray scattering (SAXS). Analysis of the scaling of the particle separation distance (d) with particle concentration (c) was used to follow the transition of CNC dispersions from an isotropic state at 1-2 vol% to a compressed nematic state at particle concentrations above 30 vol%...
October 4, 2018: Nanoscale
https://www.readbyqxmd.com/read/30226748/defect-annihilation-pathways-in-directed-assembly-of-lamellar-block-copolymer-thin-films
#16
Su-Mi Hur, Vikram Thapar, Abelardo Ramírez-Hernández, Paul F Nealey, Juan J de Pablo
Defects in highly ordered self-assembled block copolymers represent an important roadblock toward the adoption of these materials in a wide range of applications. This work examines the pathways for annihilation of defects in symmetric diblock copolymers in the context of directed assembly using patterned substrates. Past theoretical and computational studies of such systems have predicted minimum free energy pathways that are characteristic of an activated process. However, they have been limited to adjacent dislocations with opposite Burgers vectors...
October 8, 2018: ACS Nano
https://www.readbyqxmd.com/read/30222175/developing-a-magnetic-metal-organic-framework-of-copper-bearing-a-mixed-azido-butane-1-4-dicarboxylate-bridge-magnetic-and-gas-adsorption-properties
#17
Azam Hassanpoor, Masoud Mirzaei, Mahdi Niknam Shahrak, Anna M Majcher
A magnetic metal organic framework {[Cu(but-1,4-dc)0.5(N3)(H2O)]·H2O}n (MFUM-1(Cu)) (but-1,4-dc = butane-1,4-dicarboxylate) was synthesized and characterized structurally and magnetically. In MFUM-1(Cu), each CuII ion has a distorted octahedral geometry with an obvious Jahn-Teller distortion, where the coordination environment is composed of mixed EO-azido/aliphatic based carboxylate/H2O threefold bridges. These bridges extend the structure of MFUM-1(Cu) in two dimensions by covalent connectivity and form square-shaped channels...
October 9, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30213960/volume-phase-transition-kinetics-of-smart-n-n-propylacrylamide-microgels-studied-by-time-resolved-pressure-jump-small-angle-neutron-scattering
#18
Oliver Wrede, Yvonne Reimann, Stefan Lülsdorf, Daniel Emmrich, Kristina Schneider, Andreas Josef Schmid, Diana Zauser, Yvonne Hannappel, André Beyer, Ralf Schweins, Armin Gölzhäuser, Thomas Hellweg, Thomas Sottmann
The use of smart colloidal microgels for advanced applications critically depends on their response kinetics. We use pressure jump small angle neutron scattering with supreme time resolution to study the rapid volume phase transition kinetics of such microgels. Utilizing the pressure induced microphase separation inside the microgels we were able to resolve their collapse and swelling kinetics. While the collapse occurs on a time scale of 10 ms, the particle swelling turned out to be much faster. Photon correlation spectroscopy and static small angle neutron scattering unambiguously show, that the much slower collapse can be associated with the complex particle architecture exhibiting a loosely-crosslinked outer region and a denser inner core region...
September 13, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30199861/tretinoin-loaded-nanoemulsion-for-acne-vulgaris-fabrication-physicochemical-and-clinical-efficacy-assessments
#19
RANDOMIZED CONTROLLED TRIAL
Mahsa Sabouri, Aniseh Samadi, Saman Ahmad Nasrollahi, Effat Sadat Farboud, Bahareh Mirrahimi, Hournaz Hassanzadeh, Mansour Nassiri Kashani, Rassoul Dinarvand, Alireza Firooz
BACKGROUND AND AIM: Acne vulgaris is a common inflammatory skin condition which is treated using Tretinoin (TRE), a widely used retinoid. Nano emulations (NEs) are colloidal nano-sized particles that enhance the therapeutic efficacy of TRE and minimize adverse effects. This study is aimed at developing a TRE-loaded NE (NE-TRE) and at assessing the therapeutic effects of the formulation in acne vulgaris lesions, compared to conventional 0.05% TRE emulsion. METHOD: The high energy emulsification method was used to make NE-TRE...
2018: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/30194948/separation-of-cells-in-density-gradients-with-temporary-solidification-of-the-gradient-application-to-escherichia-coli-forms-obtained-by-microwave-treatment-of-pure-cultures
#20
Tatiana Abashina, Mikhail Vainshtein, Saara Korpela, Timo Korpela
Gelatin added in certain concentration into the density gradient mixtures allows to solidify and melt the gradient reversibly. Such a method was applied to separation of partially disintegrated Escherichia coli VKM B-125 cells in discontinuous sucrose gradient which was optimized to obtain small round "nano-cells" free from other cell components. Gelatin added to the sucrose solutions had the advantages: i) accurate gradient layers were formed, ii) gelatin did not interfere with the cells and sub-particles during centrifugation, iii) solidified gelatin allowed to cut out the separated cell components, and iv) gelatin allowed to prepare ready-made solidified gradient centrifugation tubes into storage...
September 5, 2018: Journal of Microbiological Methods
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