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https://www.readbyqxmd.com/read/28528217/citrus-maxima-pomelo-juice-mediated-eco-friendly-synthesis-of-zno-nanoparticles-applications-to-photocatalytic-electrochemical-sensor-and-antibacterial-activities
#1
N S Pavithra, K Lingaraju, G K Raghu, G Nagaraju
In the present work, Zinc oxide nanoparticles (ZnO Nps) have been successfully prepared through a simple, effective and low cost solution combustion method using Zn (NO3)2·6H2O as an oxidizer, chakkota (Common name=Pomelo) fruit juice as novel fuel. X-ray diffraction pattern indicates the hexagonal wurtzite structure with average crystallite size of ~22nm. ZnO Nps were characterized with the aid of different spectroscopic techniques such as Raman spectroscopy, Fourier Transform Infrared spectroscopy, Photoluminescence and UV-Visible spectroscopy...
May 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28527812/adhesive-interfacial-characteristics-and-the-related-bonding-performance-of-four-self-etching-adhesives-with-different-functional-monomers-applied-to-dentin
#2
Ruirui Wang, Yilin Shi, Tingting Li, Yueping Pan, Yu Cui, Wenwei Xia
OBJECTIVES: To examine the interfacial chemical and morphological characteristics of four self-etching adhesives bonded to dentin with different functional monomers. Further, to evaluate the effects of this interaction between functional monomers and dentin on short-term in vitro bonding performance of the four adhesives. METHODS: Clearfil SE Bond (CSE) and Scotchbond Universal (SU) containing 10-methacryloxydecyl dihydrogen phosphate (10-MDP), Optibond XTR (OX) containing glycero-phosphate dimethacrylate (GPDM), and Adper Easy One (AEO) containing 6-methacryloyloxyhexyl dihydrogen phosphate (6-MHP) were applied to the dentin surface according to the instructions supplied with each...
May 17, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28527761/bead-based-flow-cytometry-for-semi-quantitative-analysis-of-complex-membrane-vesicle-populations-released-by-bacteria-and-host-cells
#3
Charlotte Volgers, Birke J Benedikter, Gert E Grauls, Paul H M Savelkoul, Frank R M Stassen
During infection, the release of nano-sized membrane vesicle is a process which is common both for bacteria and host cells. Host cell-derived membrane vesicles can be involved in innate and adaptive immunity whereas bacterial membrane vesicles can contribute to bacterial pathogenicity. To study the contribution of both membrane vesicle populations during infection is highly complicated as most vesicles fall within a similar size range of 30-300nm. Specialized techniques for purification are required and often no single technique complies on its own...
July 2017: Microbiological Research
https://www.readbyqxmd.com/read/28527186/fabrication-of-nano-hydroxyapatite-chitosan-membrane-with-asymmetric-structure-and-its-applications-in-guided-bone-regeneration
#4
Ying Tu, Chen Chen, Yubao Li, Yi Hou, Min Huang, Li Zhang
The development of guided bone regeneration (GBR) technique brings a promising alternative for bone defects and fracture healing. In this study, an asymmetric nano-hydroxyapatite/chitosan (n-HA/CS) composite GBR membrane was fabricated by means of solution-blending and solvent-evaporating in vacuum. The membranes were characterized using SEM, XPS and contact angle. It was found that the composite membrane displayed an asymmetric structure, in which the upper surface was CS and the under surface was a complex of n-HA and CS, and some interactions between n-HA and CS were also confirmed to exist...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28527036/osteogenesis-ability-of-cad-cam-porous-zirconia-scaffolds-enriched-with-nano-hydroxyapatite-particles
#5
Moustafa N Aboushelib, Rehab Shawky
BACKGROUND: The aim of this study was to evaluate osteogenesis ability of CAD/CAM porous zirconia scaffolds enriched with hydroxy apatite used to augment large boney defects in a dog model. METHODS: Surgical defects were made bilaterally on the lower jaw of 12 Beagle dogs. Cone beam CT images were used to create three dimensional images of the healed defects. Porous zirconia scaffolds were fabricated by milling custom made CAD/CAM blocks into the desired shape. After sintering, the pores of half of the scaffolds were filled with a nano-hydroxy apatite (HA) powder while the other half served as control...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28526979/the-probabilities-of-one-and-multi-track-events-for-modeling-radiation-induced-cell-kill
#6
Uwe Schneider, Fabiano Vasi, Jürgen Besserer
In view of the clinical importance of hypofractionated radiotherapy, track models which are based on multi-hit events are currently reinvestigated. These models are often criticized, because it is believed that the probability of multi-track hits is negligible. In this work, the probabilities for one- and multi-track events are determined for different biological targets. The obtained probabilities can be used with nano-dosimetric cluster size distributions to obtain the parameters of track models. We quantitatively determined the probabilities for one- and multi-track events for 100, 500 and 1000 keV electrons, respectively...
May 19, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28526975/lipid-nanoparticles-for-administration-of-poorly-water-soluble-neuroactive-drugs
#7
Elisabetta Esposito, Markus Drechsler, Paolo Mariani, Federica Carducci, Michela Servadio, Francesca Melancia, Patrizia Ratano, Patrizia Campolongo, Viviana Trezza, Rita Cortesi, Claudio Nastruzzi
This study describes the potential of solid lipid nanoparticles and nanostructured lipid carriers as nano-formulations to administer to the central nervous system poorly water soluble drugs. Different neuroactive drugs, i.e. dimethylfumarate, retinyl palmitate, progesterone and the endocannabinoid hydrolysis inhibitor URB597 have been studied. Lipid nanoparticles constituted of tristearin or tristearin in association with gliceryl monoolein were produced. The nanoencapsulation strategy allowed to obtain biocompatible and non-toxic vehicles, able to increase the solubility of the considered neuroactive drugs...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28526840/in-situ-stem-imaging-of-growth-and-phase-change-of-individual-cualx-precipitates-in-al-alloy
#8
Chunhui Liu, Sairam K Malladi, Qiang Xu, Jianghua Chen, Frans D Tichelaar, Xiaodong Zhuge, Henny W Zandbergen
Age-hardening in Al alloys has been used for over a century to improve its mechanical properties. However, the lack of direct observation limits our understanding of the dynamic nature of the evolution of nanoprecipitates during age-hardening. Using in-situ (scanning) transmission electron microscopy (S/TEM) while heating an Al-Cu alloy, we were able to follow the growth of individual nanoprecipitates at atomic scale. The heat treatments carried out at 140, 160, 180 and 200 °C reveal a temperature dependence on the kinetics of precipitation and three kinds of interactions of nano-precipitates...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526752/the-apical-ecm-preserves-embryonic-integrity-and-distributes-mechanical-stress-during-morphogenesis
#9
Thanh Thi Kim Vuong-Brender, Shashi Kumar Suman, Michel Labouesse
Epithelia are bound by both basal and apical extracellular matrices (ECM). While the composition and function of the former have been intensively investigated, less is known about the latter. The embryonic sheath, the ECM apical to the C. elegans embryonic epidermis, has been suggested to promote its elongation. In an RNAi screen for the components of the sheath, we identified the Zona Pellucida domain proteins NOAH-1 and NOAH-2. We found that these proteins act in the same pathway, and in parallel to three other putative sheath proteins, SYM-1, LET-4 and FBN-1/Fibrillin, to ensure embryonic integrity and promote elongation...
May 19, 2017: Development
https://www.readbyqxmd.com/read/28526443/mechanical-properties-of-polymer-infiltrated-ceramic-sodium-aluminum-silicate-composites-for-dental-restoration
#10
Bencang Cui, Jing Li, Huining Wang, Yuanhua Lin, Yang Shen, Ming Li, Xuliang Deng, Cewen Nan
OBJECTIVE: To fabricate indirect restorative composites for CAD/CAM applications and evaluate the mechanical properties. METHODS: Polymer-infiltrated-ceramic composites were prepared through infiltrating polymer into partially sintered sodium aluminum silicate ceramic blocks and curing. The corresponding samples were fabricated according to standard ISO-4049 using for mechanical properties measurement. The flexural strength and fracture toughness were measured using a mechanical property testing machine...
May 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28525895/dietary-zno-nanoparticles-alters-intestinal-microbiota-and-inflammation-response-in-weaned-piglets
#11
Tian Xia, Wenqing Lai, Miaomiao Han, Meng Han, Xi Ma, Liying Zhang
The present study was carried out to determine whether low dose of zinc oxide nanoparticles (Nano-ZnO) could serve as a potential substitute of pharmacological dose of traditional ZnO in weaned piglets. 180 crossbred weaning piglets were randomly assigned to 3 treatments. Experimental animals were fed basal diet supplemented with 0 mg Zn/kg (Control), 600 mg Zn/kg (Nano-ZnO) and 2000 mg Zn/kg (ZnO) for 14 days. On day 14 after weaning, the piglets fed Nano-ZnO did not differ from those fed traditional ZnO in growth performance and jejunal morphology, while Nano-ZnO treatment could significantly alleviate the incidence of diarrhea (P < 0...
May 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28525820/sensing-inhomogeneous-mechanical-properties-of-human-corneal-descemet-s-membrane-with-afm-nano-indentation
#12
Rosa Di Mundo, Giuseppina Recchia, Mohit Parekh, Alessandro Ruzza, Stefano Ferrari, Giuseppe Carbone
The paper describes a highly space-resolved characterization of the surface mechanical properties of the posterior human corneal layer (Descemet's membrane). This has been accomplished with Atomic Force Microscopy (AFM) nano-indentation by using a probe with a sharp tip geometry. Results indicate that the contact with this biological tissue in liquid occurs with no (or very low) adhesion. More importantly, under the same operating conditions, a broad distribution of penetration depth can be measured on different x-y positions of the tissue surface, indicating a high inhomogeneity of surface stiffness, not yet clearly reported in the literature...
May 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28525283/two-dimensional-electric-double-layer-structure-with-heterogeneous-surface-charge
#13
Christopher McCallum, Sumita Pennathur, Dirk Gillespie
This work presents a systematic study of the lateral (parallel to the wall) and normal (perpendicular to the wall) nano-structure of the electric double layer at a heterogeneous interface between two regions of different surface charge, often found in nanoscale electrochemical devices. Specifically, classical Density Functional Theory (DFT) is used to probe a cation concentration range of 10 mM to 1 M, for valences of +1, +2, and +3, and a diameter range of 0.15 to 0.9 nm over widely varying surface charges (between ±0...
May 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28525278/role-of-edge-engineering-in-photoconductiviy-of-graphene-nano-ribbons
#14
Ivan Ivanov, Yunbin Hu, Silvio Osella, Uliana Beser, Hai I Wang, David Beljonne, Akimitsu Narita, Klaus Müllen, Dmitry Turchinovich, Mischa Bonn
The effect of edge engineering of graphene nanoribbons (GNRs) on their ultrafast photoconductivity is investigated. Three different GNRs were fabricated by bottom-up synthesis in the liquid phase, where structure, width, and edge planarity could be controlled chemically at the atomic level. The charge carrier transport in the fabricated GNRs was studied on the ultrafast, sub-picosecond time-scale using time-resolved terahertz (THz) spectroscopy, giving access to the elementary parameters of carrier conduction...
May 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28525273/directional-fluid-gating-by-janus-membranes-with-heterogeneous-wetting-properties-for-selective-oil-water-separation
#15
Prashant Gupta, Balasubramanian Kandasubramanian
The rising oil seepage accidents evolved into a global issue necessitating immediate counter measure to abridge its catastrophic repercussions on sensitive marine ecosystem urging innovative techniques for effective oil/water separation. Here, we report surface tailored wettability modified superhydrophobic/superoleophilic Janus membrane by impregnating non-ionic surfactant stabilized nano-sized polytetrafluoroethylene (PTFE) dispersion polymerized via non-fluorinated processing aid onto cotton substrate using Meyer rod coating technique, exhibiting excellent separation efficiency up to 98% with various petroleum products and retaining its intrinsic properties for at least 30 recurrences...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28524821/plasmonic-nano-patch-array-with-integrated-metal-organic-framework-for-enhanced-infrared-absorption-gas-sensing
#16
Xinyuan Chong, Ki-Joong Kim, Yujing Zhang, Erwen Li, Paul Ohodnicki, Chih-Hung Chang, Alan Wang
In this letter, we present a nanophotonic device consisting of plasmonic nano-patch array with integrated metal-organic framework (MOF) for enhanced infrared absorption gas sensing. By designing a gold nanopatch array (Au-NPA) on a sapphire substrate, we are able to achieve enhanced optical field that spatially overlaps with the MOF layer, which can adsorb carbon dioxide (CO2) with high capacity. Experimental results show that this hybrid plasmonic-MOF device can effectively increase the infrared absorption path of on-chip gas sensors by more than 1,100-fold...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28524743/nanoparticle-exposures-from-nano-enabled-toner-based-printing-equipment-and-human-health-state-of-science-and-future-research-needs
#17
Sandra Vanessa Pirela, John Martin, Dhimiter Bello, Philip Demokritou
Toner formulations used by laser printers (LP) and photocopiers (PC), collectively called "toner-based printing equipment" (TPE), are nano-enabled products (NEP) because they contain several engineered nanomaterials (ENM) that improve toner performance. It has been shown that during consumer use (printing), these ENM are released in the air, together with other semi-volatile organic nanoparticles, and newly formed gaseous co-pollutants such as volatile organic compounds (VOC). The aim of this review is to detail and analyze physico-chemical and morphological (PCM), as well as the toxicological properties of particulate matter (PM) emissions from TPE...
May 19, 2017: Critical Reviews in Toxicology
https://www.readbyqxmd.com/read/28524659/synthesis-molecular-docking-molecular-dynamics-studies-and-biological-evaluation-of-4h-chromone-1-2-3-4-tetrahydropyrimidine-5-carboxylate-derivatives-as-potential-anti-leukemic-agents
#18
Zahra Dolatkhah, Shahrzad Javanshir, Ahmad Shahir Sadr, Jaber Hosseini, Soroush Sardari
Series of 4H-chromone-1,2,3,4-tetrahydropyrimidine-5-carboxylates derivatives were synthesized via a three component one-pot condensation of chromone-3-carbaldehyde, alkyl acetoacetate and urea or thiourea, using MCM-41-SO3H as an efficient Nano-catalysts, and evaluated for their anti-cancer activity using a combined in silico docking and molecular dynamics protocol to estimate the binding affinity of the title compounds with the Bcr-Abl oncogene. Two programs, AutoDock 4 and AutoDock Vina software were applied to dock the target protein with synthesized compounds and ATP...
May 19, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28524652/optical-characteristics-and-tumor-imaging-capabilities-of-near-infrared-dyes-in-free-and-nano-encapsulated-formulations-comprised-of-viral-capsids
#19
Yadir Guerrero, Sheela Singh, Turong Mai, Ravoori Murali, Leela Tanikella, Atta Zahedi, Vikas Kundra, Bahman Anvari
Near infrared (NIR) fluorescent molecules and nano-sized structures can serve as potential optical probes for image-guided removal of small tumor nodules (≈ < 1 mm diameter). While indocyanine green (ICG) remains as the only FDA-approved NIR dye, other organic dyes are under extensive development for enhanced imaging capabilities. One such dye is BrCy106-NHS where bromine is substituted for aromatic structures in cyanine dyes. Herein, we investigate the absorption and fluorescence characteristics of ICG and BrCy106-NHS, and quantitatively assess their tumor imaging capabilities in free (non-encapsulated) and a nano-encapsulated form that utilizes the capsid protein (CP) from genome-depleted plant-infecting brome mosaic virus as the encapsulating shell...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28524649/synthesis-and-stabilization-of-colloidal-perovskite-nanocrystals-by-multidentate-polymer-micelles
#20
Shaocong Hou, Yuzheng Guo, Yuguo Tang, Qimin Quan
Lead halide perovskites have emerged as low-cost, high-performance optical and optoelectronic materials, however, their material stability has been a limiting factor for broad applications. Here, we demonstrate stable core-shell colloidal perovskite nanocrystals using a novel, facile and low-cost co-polymer templated synthesis approach. The block co-polymer serves as a confined nano-reactor during perovskite crystallization and passivates the perovskite surface by forming a multidentate capping shell, thus significantly improving its photo-stability in polar solvents...
May 19, 2017: ACS Applied Materials & Interfaces
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