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https://www.readbyqxmd.com/read/29679935/the-role-of-adsorbate-size-on-adsorption-of-ne-and-xe-on-graphite
#1
Luisa Prasetyo, Quang K Loi, Shiliang Johnathan Tan, D D Do, D Nicholson
We have carried out an extensive grand canonical Monte Carlo simulation to investigate the adsorption of neon and xenon on graphite. The adsorbate collision diameters of neon and xenon are smaller and greater respectively, than the commensurate graphite lattice spacing λ=3×3R300 of 0.426 nm. Simulated isotherms and isosteric heats were obtained using a graphite model that has been shown to describe successfully the adsorbate transitions for krypton, methane and nitrogen by Prasetyo et al. (2017), which have collision diameters close to λ...
April 10, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29679828/accelerated-effects-of-nano-zno-on-phosphorus-removal-by-chlorella-vulgaris-formation-of-zinc-phosphate-crystallites
#2
Huaixian Xiao, Na Liu, Ke Tian, Shixiang Liu, Fei Ge
Nanoparticles have been reported to induce toxicity to aquatic organisms, however, their potential impacts on phosphorus removal from wastewater by algae are unclear. In this study, the effects of nanoparticle ZnO (nano-ZnO) on phosphate (PO4 3- ) removal by a green alga Chlorella vulgaris were investigated. We found that PO4 3- removal efficiency was accelerated with high concentrations of nano-ZnO (0.04-0.15mM) but reduced with low concentrations of nano-ZnO (0.005-0.04mM) compared to the control (without nano-ZnO), suggesting that PO4 3- removal efficiency by C...
April 18, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29679800/synthetic-investigation-of-binary-ternary-cr-iii-hydroxycarboxylic-acid-aromatic-chelator-systems-structure-specific-influence-on-adipogenic-biomarkers-linked-to-insulin-mimesis
#3
O Tsave, C Gabriel, M Kafantari, M Yavropoulou, J G Yovos, C P Raptopoulou, V Psycharis, A Terzis, C Mateescu, A Salifoglou
In an attempt to understand the aqueous interactions of Cr(III) with low-molecular mass physiological ligands and examine its role as an adipogenic metallodrug agent in Diabetes mellitus II, the pH-specific synthesis in the binary-ternary Cr(III)-(HA = hydroxycarboxylic acid)-(N,N)-aromatic chelator (AC) (HA = 2-hydroxyethyl iminodiacetic acid/heidaH2 , quinic acid; AC = 1,10-phenanthroline/phen) systems was pursued, leading to four new crystalline compounds. All materials were characterized by elemental analysis, UV-Visible, FT-IR, and ESI-MS spectroscopy, cyclic voltammetry, and X-Ray crystallography...
February 10, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29679708/the-impact-of-polymers-on-3d-microstructure-and-controlled-release-of-sildenafil-citrate-from-hydrophilic-matrices
#4
Anna Krupa, Zbisław Tabor, Jacek Tarasiuk, Beata Strach, Krzysztof Pociecha, Elżbieta Wyska, Sebastian Wroński, Ewelina Łyszczarz, Renata Jachowicz
Sildenafil citrate has short biological half-life in humans. Thus, matrix tablets of controlled release were designed and prepared by compaction on the basis of hydrophilic polymers, i.e. HPMC, sodium alginate, carbomer, poloxamer and their mixtures. The impact of these polymers on sildenafil release in vitro and its pharmacokinetics in vivo was evaluated. Since drug release rate from hydrophilic matrices can be govern by the porosity of the matrix, the microstructure of tablets was studied using X-ray microcomputed tomography...
April 18, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29679707/enhanced-delivery-of-fixed-dose-combination-of-synergistic-antichagasic-agents-posaconazole-benznidazole-based-on-amorphous-solid-dispersions
#5
Camila Bezerra Melo Figueirêdo, Daniela Nadvorny, Amanda Carla Quintas de Medeiros Vieira, Giovanna Christinne Rocha de Medeiros Schver, José Lamartine Soares Sobrinho, Pedro José Rolim Neto, Ping I Lee, Monica Felts de La Roca Soares
Posaconazole (PCZ) and benznidazole (BNZ) are known to show synergetic effect in treating the acute and chronic phases of Chagas disease, a neglected parasitic disease. However, as both compounds are poorly water soluble, the development of amorphous solid dispersions (ASDs) of a PCZ/BNZ fixed-dose combination in a water-soluble polymer becomes an attractive option to increase their apparent solubility and dissolution rate, potentially improving their oral bioavailability. The initial approach was to explore solvent evaporated solid dispertion (SD) systems for a PCZ/BNZ 50:50 (wt%) combination at several total drug loading levels (from SD with 10% to 50% drug loading) in water-soluble carriers, including polyvinylpyrrolidone (PVP K-30) and vinylpyrrolidone-vinyl acetate copolymer (PVPVA 64)...
April 18, 2018: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29679690/reduced-body-weight-or-increased-muscle-quality-which-is-more-important-for-improving-physical-function-following-exercise-and-weight-loss-in-overweight-and-obese-older-women
#6
Chad R Straight, Alison C Berg, Rachelle A Reed, Mary Ann Johnson, Ellen M Evans
The purpose of this study was to examine the relative contributions of changes in muscle quality and body composition to changes in lower-extremity physical function (LEPF) following a 6-month exercise and weight loss intervention in overweight and obese older women. Thirty-eight overweight and obese (BMI = 30.0 ± 4.4 kg/m2 ) older (age = 69.3 ± 4.1 y) women completed 6 months of multicomponent exercise (cardiorespiratory, resistance, balance and flexibility training) and weight loss (hypocaloric diet that reduced energy intake by ~500 kcal/d)...
April 18, 2018: Experimental Gerontology
https://www.readbyqxmd.com/read/29679672/cellulose-acetate-composite-membranes-tailored-with-exfoliated-tungsten-disulfide-nanosheets-permeation-characteristics-and-antifouling-ability
#7
S Vetrivel, M Sri Abirami Saraswathi, D Rana, K Divya, A Nagendran
An attempt has been made to demonstrate the effects of exfoliated tungsten disulfide (E-WS2 ) nanosheets on the fabrication, permeation and anti-fouling performance of cellulose acetate (CA) ultrafiltration membranes. The E-WS2 was prepared and characterized in terms of energy dispersive X-ray spectroscopy (EDXS) and X-ray diffraction spectroscopy (XRD). Pure and composite CA membranes were methodically characterized for its surface, chemical and morphological structure using FT-IR, XRD, SEM and water contact angle analysis...
April 18, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29679608/detection-and-quantitative-determination-of-heavy-metals-in-electronic-cigarette-refill-liquids-using-total-reflection-x-ray-fluorescence-spectrometry
#8
Eleni Kamilari, Konstantinos Farsalinos, Konstantinos Poulas, Christos G Kontoyannis, Malvina G Orkoula
Electronic cigarettes are considered healthier alternatives to conventional cigarettes containing tobacco. They produce vapor through heating of the refill liquids (e-liquids) which consist of propylene glycol, vegetable glycerin, nicotine (in various concentrations), water and flavoring agents. Heavy metals may enter the refill liquid during the production, posing a risk for consumer's health due to their toxicity. The objective of the present study was the development of a methodology for the detection and quantitative analysis of cadmium (Cd), lead (Pb), nickel (Ni), copper (Cu), arsenic (As) and chromium (Cr), employing Total Reflection X-Ray Fluorescence Spectroscopy (TXRF) as an alternative technique to ICP-MS or ICP-OES commonly used for this type of analysis...
April 18, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29679299/impact-of-computer-aided-ct-and-pet-analysis-on-non-invasive-t-staging-in-patients-with-lung-cancer-and-atelectasis
#9
Paul Flechsig, Ramin Rastgoo, Clemens Kratochwil, Ole Martin, Tim Holland-Letz, Alexander Harms, Hans-Ulrich Kauczor, Uwe Haberkorn, Frederik L Giesel
PURPOSE: Tumor delineation within an atelectasis in lung cancer patients is not always accurate. When T staging is done by integrated 2-deoxy-2-[18 F]fluoro-D-glucose ([18 F]FDG)-positron emission tomography (PET)/X-ray computer tomography (CT), tumors of neuroendocrine differentiation and slowly growing tumors can present with reduced FDG uptake, thus aggravating an exact T staging. In order to further exhaust information derived from [18 F]FDG-PET/CT, we evaluated the impact of CT density and maximum standardized uptake value (SUVmax) for the classification of different tumor subtypes within a surrounding atelectasis, as well as possible cutoff values for the differentiation between the primary tumor and atelectatic lung tissue...
April 20, 2018: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/29679271/concurrent-reduction-adsorption-of-chromium-using-m-phenylenediamine-modified-magnetic-chitosan-kinetics-isotherm-and-mechanism
#10
Zhonghao Wan, Meng Li, Qian Zhang, Zixi Fan, Francis Verpoort
Magnetic chitosan particles (MCS) were chemically grafted by m-phenylenediamine (mPD) forming a distinctive shell layer with abundant nitrogenous functional groups and used as an adsorbent for the effective removal of Cr(VI) from aqueous solution. By interaction among functional groups in the facile oxidative polymerization process, the grafting of mPD and its polymers on MCS surface was innovatively realized. Through Fourier-transformed infrared spectroscopy, energy dispersive spectrometer, X-ray photoelectron spectroscopy, etc...
April 20, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29679136/the-pedicle-instrumentation-and-percutaneous-elevation-pi-pe-a-new-cementless-surgical-technique-in-type-a-post-traumatic-vertebral-fractures
#11
Andrea Piazzolla, Giuseppe Solarino, Davide Bizzoca, Claudia Parato, Gaetano Monteleone, Franca Dicuonzo, Biagio Moretti
PURPOSE: To investigate if bone substitutes are strictly necessary to restore the vertebral body height and improve the clinical outcome, in patients with thoracolumbar or lumbar AO type A post-traumatic vertebral fractures, managed with balloon kyphoplasty combined with posterior screw and rod system. METHODS: 105 patients with post-traumatic thoracolumbar spine fracture were recruited. At baseline, the patients underwent a CT and an MRI of the spine. Clinical evaluation was performed, using the Visual Analog Scale (VAS) and the Oswestry Disability Index (ODI), at baseline, 48 h after surgery, at 3-month follow-up (FU), 6-month FU, 48 h after the instrumentation removal and at 24-month FU...
April 20, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29679056/complete-agreement-of-the-post-spinel-transition-with-the-660-km-seismic-discontinuity
#12
Takayuki Ishii, Rong Huang, Hongzhan Fei, Iuliia Koemets, Zhaodong Liu, Fumiya Maeda, Liang Yuan, Lin Wang, Dmitry Druzhbin, Takafumi Yamamoto, Shrikant Bhat, Robert Farla, Takaaki Kawazoe, Noriyoshi Tsujino, Eleonora Kulik, Yuji Higo, Yoshinori Tange, Tomoo Katsura
The 660-km seismic discontinuity, which is a significant structure in the Earth's mantle, is generally interpreted as the post-spinel transition, as indicated by the decomposition of ringwoodite to bridgmanite + ferropericlase. All precise high-pressure and high-temperature experiments nevertheless report 0.5-2 GPa lower transition pressures than those expected at the discontinuity depth (i.e. 23.4 GPa). These results are inconsistent with the post-spinel transition hypothesis and, therefore, do not support widely accepted models of mantle composition such as the pyrolite and CI chondrite models...
April 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29679031/exploring-drying-pattern-of-a-sessile-droplet-of-genomic-dna-in-the-presence-of-hematite-nanoparticles
#13
Rekha Bhar, Gurpreet Kaur, S K Mehta
For the first time, drying pattern of a sessile droplet of genomic DNA, in the presence of hematite nanoparticles was sighted by polarizing optical microscopy (POM) in this research article. POM results indicated that only at an appreciably high concentration of hematite nanoparticles dried pattern of deoxyribonucleic acid from calf thymus (CT-DNA) was altered. Iron hybridized cetylpyridinium chloride was utilized for the preparation of iron oxide nanoparticles through hydrothermal method. Fourier transforms infrared spectroscopy (FTIR) and powder x-ray diffraction (PXRD) studies confirmed the formation of highly crystalline hematite i...
April 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29679030/the-effect-of-crystallite-size-on-pressure-amplification-in-switchable-porous-solids
#14
Simon Krause, Volodymyr Bon, Irena Senkovska, Daniel M Többens, Dirk Wallacher, Renjith S Pillai, Guillaume Maurin, Stefan Kaskel
Negative gas adsorption (NGA) in ordered mesoporous solids is associated with giant contractive structural transitions traversing through metastable states. Here, by systematically downsizing the crystal dimensions of a mesoporous MOF (DUT-49) from several micrometers to less than 200 nm, counterintuitive NGA phenomena are demonstrated to critically depend on the primary crystallite size. Adsorbing probe molecules, such as n-butane or nitrogen, gives insights into size-dependent activation barriers and thermodynamics associated with guest-induced network contraction...
April 20, 2018: Nature Communications
https://www.readbyqxmd.com/read/29678788/response-surface-methodology-for-production-characterization-and-application-of-solvent-salt-and-alkali-tolerant-alkaline-protease-from-isolated-fungal-strain-aspergillus-niger-wa-2017
#15
Walaa A Abdel Wahab, Samia A Ahmed
Isolated strain Aspergillus niger WA 2017 was selected as potential protease producer and was identified on the basis of 18S rDNA gene homology. Optimization of protease production conditions was performed using statistical methodology. The most significant factors were identified by Plackett-Burman design (PB) and were optimized by central composite design (CCD). The enzyme production was increased by 3.6-fold with statistically optimized medium when compared to the basal medium. Based on the protease activity, 25-50% ethanol fraction exhibited the highest specific activity...
April 17, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29678765/characterization-of-human-triosephosphate-isomerase-s-nitrosylation
#16
Jorge Miguel Romero, María Elena Carrizo, Juan Agustín Curtino
Triosephosphate isomerase (TPI), the glycolytic enzyme that catalyzes the isomerization of dihydroxyacetone phosphate (DHAP) to glyceraldehyde-3-phosphate (G3P), has been frequently identified as a target of S-nitrosylation by proteomic studies. However, the effect of S-nitrosylation on its activity has only been explored in plants and algae. Here, we describe the in vitro S-nitrosylation of human TPI (hTPI), and the effect of the modification on its enzymatic parameters. NO-incorporation into the enzyme cysteine residues occurred by a time-dependent S-transnitrosylation from both, S-nitrosocysteine (CySNO) and S-nitrosoglutathione (GSNO), with CySNO being the more efficient NO-donor...
April 17, 2018: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/29678734/polymeric-micelle-mediated-delivery-of-half-sandwich-ruthenium-ii-complexes-with-phosphanes-derived-from-fluoroloquinolones-for-lung-adenocarcinoma-treatment
#17
Przemysław Kołoczek, Agnieszka Skórska-Stania, Agnieszka Cierniak, Victor Sebastian, Urszula K Komarnicka, Michał Płotek, Agnieszka Kyzioł
Novel half-sandwich ruthenium(II) complexes with aminomethyl(diphenyl)phosphine derived from fluoroloquinolones (RuPCp, RuPSf, RuPLm, RuPNr) were being investigated as alternatives to well-established metal-based chemotherapeutics. All compounds were characterized by elemental analysis, selected spectroscopic methods (i.e., absorption and fluorescence spectroscopy, ESI-MS, NMR, circular dichroizm), X-ray diffractometry, ICP-MS, and electrochemical techniques. To overcome low solubility, serious side effects connected with systemic cytotoxicity of ruthenium complexes, and acquiring the resistance of cancer cells, polymeric nanoformulations based on Pluronic P-123 micelles loaded with selected Ru(II) complexes were prepared and characterized...
April 17, 2018: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29678696/sarcopenic-obesity-revisited-insights-from-the-mr-and-ms-os-cohort
#18
Jean Woo, Jason Leung
OBJECTIVES: Following the concept of a metabolic load-capacity model, we propose the use of appendicular skeletal muscle mass (ASM) to total body fat (TBF) ratio in predicting 4-year physical limitations, physical performance measures, 6-year incident diabetes and cardiovascular diseases, and 12-year mortality. DESIGN: Cross-sectional and prospective cohort study. SETTING AND PARTICIPANTS: 4000 men and women aged 65 years and older living in the community...
April 17, 2018: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/29678689/using-high-resolution-x-ray-computed-tomography-to-create-an-image-based-model-of-a-lymph-node
#19
L J Cooper, B Zeller-Plumhoff, G F Clough, B Ganapathisubramani, T Roose
Lymph nodes are an important part of the immune system. They filter the lymphatic fluid as it is transported from the tissues before being returned to the blood stream. The fluid flow through the nodes influences the behaviour of the immune cells that gather within the nodes and the structure of the node itself. Measuring the fluid flow in lymph nodes experimentally is challenging due to their small size and fragility. In this paper, we present high resolution X-ray computed tomography images of a murine lymph node...
April 17, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29678613/a-3d-printed-bilayer-oral-solid-dosage-form-combining-metformin-for-prolonged-and-glimepiride-for-immediate-drug-delivery
#20
Christos I Gioumouxouzis, Apostolos Baklavaridis, Orestis L Katsamenis, Catherine K Markopoulou, Nikolaos Bouropoulos, Dimitrios Tzetzis, Dimitrios G Fatouros
Fused Deposition Modelling (a.k.a. FDM-3D printing) has been previously employed in the development of personalized medicines with unique properties and release behavior. In the present work, a bilayer dosage form containing two anti-diabetic drugs with different daily dosage regimens; i.e. metformin and glimepiride, was manufactured via FDM 3D printing, studied using a variety of techniques and characterized in vitro. Metformin and glimepiride were embedded in Eudragit® RL sustained release layer and polyvinyl alcohol (PVA) layer respectively...
April 17, 2018: European Journal of Pharmaceutical Sciences
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