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https://www.readbyqxmd.com/read/29241128/mobility-of-polivinylpyrrolidone-coated-silver-nanoparticles-in-tropical-soils
#1
Alejandro Yopasá Arenas, Gustavo de Souza Pessôa, Marco Aurélio Zezzi Arruda, Anne Hélène Fostier
Experiments in saturated soil columns were performed to investigate the transport and retention of 25 nm and 75 nm silver nanoparticles stabilized with polyvinylpyrrolidone (PVP-AgNPs) in two Brazilian soils (sandy and sandy-clay). The normalized concentration of the PVP-AgNPs was obtained through a flow injection analysis method based on the surface plasmon ressonance effect of the metallic nanoparticles. The use of the ultraviolet-visible spectroscopy (UV-Vis) allows a rapid and low-cost analysis. The obtained breakthrough curves (BCs) were modeled with a deterministic model of solute transport in steady conditions of water flow and considering two regions of non-physical equilibrium; this model allowed the determination of the hydrodynamic parameters...
December 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29241117/influence-of-direct-and-alternating-current-electric-fields-on-efficiency-promotion-and-leaching-risk-alleviation-of-chelator-assisted-phytoremediation
#2
Jie Luo, Limei Cai, Shihua Qi, Jian Wu, Xiaowen Sophie Gu
Direct and alternating current electric fields with various voltages were used to improve the decontamination efficiency of chelator assisted phytoremediation for multi-metal polluted soil. The alleviation effect of electric field on leaching risk caused by chelator application during phytoremediation process was also evaluated. Biomass yield, pollutant uptake and metal leaching retardation under alternating current (AC) and direct current (DC) electric fields were compared. The biomass yield of Eucalyptus globulus under AC fields with various voltages (2, 4 and 10 V) were 3...
December 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29240923/neutrophil-activation-signature-in-juvenile-idiopathic-arthritis-indicates-the-presence-of-low-density-granulocytes
#3
Kavitha Ramanathan, Anna Glaser, Hanna Lythgoe, Joanne Ong, Michael W Beresford, Angela Midgley, Helen L Wright
Objective: JIA is an autoimmune, inflammatory disease with involvement of innate and adaptive immune responses. However, the role of neutrophils in JIA pathogenesis remains unclear. This study aimed to identify and validate neutrophil gene expression signatures in JIA using public microarray datasets and new clinical samples. Methods: Three suitable datasets were analysed by significance analysis of microarray and Ingenuity. Neutrophils and peripheral blood mononuclear cells (PBMCs) were isolated from a new cohort of JIA patients and healthy paediatric controls (HCs)...
December 12, 2017: Rheumatology
https://www.readbyqxmd.com/read/29240806/the-structure-of-salt-marsh-soil-mesofauna-food-webs-the-prevalence-of-disturbance
#4
Kristin Haynert, Mirijam Kiggen, Bernhard Klarner, Mark Maraun, Stefan Scheu
Mesofauna taxa fill key trophic positions in soil food webs, even in terrestrial-marine boundary habitats characterized by frequent natural disturbances. Salt marshes represent such boundary habitats, characterized by frequent inundations increasing from the terrestrial upper to the marine pioneer zone. Despite the high abundance of soil mesofauna in salt marshes and their important function by facilitating energy and carbon flows, the structure, trophic ecology and habitat-related diet shifts of mesofauna species in natural salt marsh habitats is virtually unknown...
2017: PloS One
https://www.readbyqxmd.com/read/29240630/in-vitro-characterization-of-the-pittsburgh-pediatric-ambulatory-lung
#5
Ryan A Orizondo, Alexandra G May, Shalv P Madhani, Brian J Frankowski, Greg W Burgreen, Peter D Wearden, William J Federspiel
Acute and chronic respiratory failure are a significant source of pediatric morbidity and mortality. Current respiratory support options used to bridge children to lung recovery or transplantation typically render them bedridden and can worsen long-term patient outcomes. The Pittsburgh Pediatric Ambulatory Lung (P-PAL) is a wearable pediatric blood pump and oxygenator (0.3 m surface area) integrated into a single compact unit that enables patient ambulation. The P-PAL is intended for long-term use and designed to provide up to 90% of respiratory support in children weighing 5-25 kg...
December 11, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/29240450/letter-in-response-to-tp-e-interval-and-tp-e-qt-ratio-before-and-after-catheter-ablation-in-patients-with-premature-ventricular-complexes
#6
Ahmet Korkmaz, Deniz Sahin, Umit Guray
AIM: Recently fragmented QRS (fQRS) on ECG has been introduced as a predictor of myocardial scarring and myocardial ischemia in coronary artery disease. OBJECTIVE: The aim of this study was to investigate the relationship between fQRS and fractional flow reserve (FFR) results in patients with the intermediate degree of coronary artery stenosis. METHODS: A total of 301 consecutive patients who underwent coronary angiography and FFR measurement for intermediate coronary artery stenosis were included in the study...
December 14, 2017: Biomarkers in Medicine
https://www.readbyqxmd.com/read/29240066/peculiarities-of-vitalization-of-grafts-made-of-porous-polytetrafluoroethylene-in-reconstruction-of-major-veins-an-experimental-study
#7
S É Voskanian, M V Shabalin, A V Volkov, I Iu Kolyshev
Increased incidence of locally disseminated malignant neoplasms with invasion of major veins compels modern surgery to search for an optimal material for reconstruction of major veins. Presented herein are the results of an experimental study aimed at exploring patency and peculiarities of vitalization of grafts made of porous polytetrafluoroethylene (7th generation, 2010) manufactured by the Closed Joint Stock Company 'Research and Production Complex 'Ecoflon' (St. Petersburg, Russia) with an internal diameter measuring 4...
2017: Angiologii︠a︡ i Sosudistai︠a︡ Khirurgii︠a︡, Angiology and Vascular Surgery
https://www.readbyqxmd.com/read/29240010/well-preserved-renal-function-in-children-with-untreated-chronic-liver-disease
#8
Ulla B Berg, Antal Németh
OBJECTIVES: Based on studies with hepatorenal syndrome, it is widely regarded that renal function is impacted in chronic liver disease. Therefore we investigated renal function in our children with chronic liver disease. METHODS: In a retrospective study of 277 children with chronic liver disease, renal function was investigated as glomerular filtration rate (GFR) and effective renal plasma flow (ERPF), measured as clearance of inulin and para-amino hippuric acid or clearance of iohexol...
December 12, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/29239696/compression-garments-and-cerebral-blood-flow-influence-on-cognitive-and-exercise-performance
#9
Brittany A Smale, Joseph M Northey, Disa J Smee, Nathan G Versey, Ben Rattray
This study aimed to describe the effect of compression garments on middle cerebral artery blood flow velocity (MCAv) in relation to cognitive and exercise performance whilst cycling. In a randomised-controlled-cross-over design, 15 well-trained male cyclists were recruited to participate in three identical trials wearing loose fitting shorts (control), low-grade, or medium-grade compression garments. The protocol involved four 8 min increments of cycling at 30%, 50%, 70%, and 85% maximal power output and a 4 km time-trial...
December 14, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29239685/in%C3%A2-vitro-angiographic-comparison-of-the-flow-diversion-performance-of-five-neurovascular-stents
#10
Ronak J Dholakia, Ari D Kappel, Andrew Pagano, Henry H Woo, Baruch B Lieber, David J Fiorella, Chander Sadasivan
Background and purpose Data differentiating flow diversion properties of commercially available low- and high-porosity stents are limited. This in vitro study applies angiographic analysis of intra-aneurysmal flow to compare the flow-diversion performance of five neurovascular devices in idealized sidewall and bifurcation aneurysm models. Methods Five commercial devices (Enterprise, Neuroform, LVIS, FRED, and Pipeline) were implanted in silicone sidewall and bifurcation aneurysm models under physiological average flow of blood analog fluid...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/29239613/dewetting-of-thin-liquid-films-surrounding-air-bubbles-in-microchannels
#11
Sepideh Khodaparast, Omer Atasi, Antoine Deblais, Benoit Scheid, Howard A Stone
As an air bubble translates in a microchannel, a thin film of liquid is formed on the bounding walls. In a microchannel with a rectangular cross section, the liquid in the film leaks towards the low-pressure corners of the geometry, which leads to the appearance of local minima in the film thickness in the cross-sectional plane. In such a configuration, theory suggests that the minimum film thickness scales with Ca and Ca(4/3) depending on the distance from the nose of the bubble, where Ca = μUb/γ is the flow capillary number based on the bubble velocity Ub, liquid viscosity μ and surface tension γ...
December 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29239461/subclinical-atherogenesis-in-patients-with-mild-psoriasis-a-role-for-il-6
#12
Michelle Larissa Zini Lise, Talita Siara Almeida Baptista, Laura Esteves Petersen, Moisés Evandro Bauer, Cláudia Almeida Lopes Ungaretti, Elton Torres, Karen Harter, Henrique Luiz Staub
INTRODUCTION: A link of psoriasis with subclinical atherosclerosis has been postulated and cytokine network might intermediate this association. Few data are available in patients with mild psoriasis. We evaluated carotid intima-media thickness (cIMT) in drug-free psoriatic individuals and controls. In parallel, we searched for associations of cIMT with disease activity indexes and serum interleukins (IL) in psoriatic patients. METHOD: An experienced radiologist performed the cIMT analyses...
September 2017: Revista da Associação Médica Brasileira
https://www.readbyqxmd.com/read/29239446/shear-thickening-in-concentrated-suspensions-of-smooth-spheres-in-newtonian-suspending-fluids
#13
REVIEW
Morton M Denn, Jeffrey F Morris, Daniel Bonn
Shear thickening is a phenomenon in which the viscosity of a suspension increases with increasing stress or shear rate, sometimes in a discontinuous fashion. While the phenomenon, when observed in suspensions of corn starch in water, or Oobleck, is popular as a science experiment for children, shear thickening is actually of considerable importance for technological applications and exhibited by far simpler systems. Concentrated suspensions of smooth hard spheres will exhibit shear thickening, and understanding this behavior has required a fundamental change in the paradigm of describing low-Reynolds-number solid-fluid flows, in which contact forces have traditionally been absent...
December 14, 2017: Soft Matter
https://www.readbyqxmd.com/read/29239300/hydrodynamic-instabilities-in-miscible-fluids
#14
Domenico Truzzolillo, Luca Cipelletti
Hydrodynamic instabilities in miscible fluids are ubiquitous, from natural phenomena up to geological scales, to industrial and technological applications, where they represent the only way to control and promote mixing at low Reynolds numbers, well below the transition from laminar to turbulent flow. As for immiscible fluids, the onset of hydrodynamic instabilities in miscible fluids is directly related to the physics of their interfaces. The focus of this review is therefore on the general mechanisms driving the growth of disturbances at the boundary between miscible fluids, under a variety of forcing conditions...
December 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29238880/in-vitro-performance-of-prefilled-co2-absorbers-with-the-zeus%C3%A2
#15
Mohab Omer, Jan F A Hendrickx, Simon De Ridder, Alexander De Houwer, Rik Carette, Sofie De Cooman, Andre M De Wolf
Low fresh gas flows (FGFs) decrease the use of anesthetic gases, but increase CO2 absorbent usage. CO2 absorbent usage remains poorly quantified. The goal of this study is to determine canister life of 8 commercially available CO2 absorbent prepacks with the Zeus®. Pre-packed CO2 canisters of 8 different brands were tested in vitro: Amsorb Plus, Spherasorb, LoFloSorb, LithoLyme, SpiraLith, SpheraSorb, Drägersorb 800+, Drägersorb Free, and CO2ntrol. CO2 (160 mL min- 1) flowed into the tip of a 2 L breathing bag that was ventilated with a tidal volume of 500 mL, a respiratory rate of 10/min, and an I:E ratio of 1:1 using the controlled mechanical ventilation mode of the Zeus® (Dräger, Lubeck, Germany)...
December 13, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29238548/energy-and-speleogenesis-key-determinants-of-terrestrial-species-richness-in-caves
#16
Alberto Jiménez-Valverde, Alberto Sendra, Policarp Garay, Ana Sofia P S Reboleira
The aim of this study was to unravel the relative role played by speleogenesis (i.e., the process in which a cave is formed), landscape-scale variables, and geophysical factors in the determination of species richness in caves. Biological inventories from 21 caves located in the southeastern Iberian Peninsula along with partial least square (PLS) regression analysis were used to assess the relative importance of the different explanatory variables. The caves were grouped according to the similarity in their species composition; the effect that spatial distance could have on similarity was also studied using correlation between matrices...
December 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/29238007/diagnostic-performance-of-arterial-spin-labeling-for-grading-nonenhancing-astrocytic-tumors
#17
Delgerdalai Khashbat, Masafumi Harada, Takashi Abe, Mungunbagana Ganbold, Seiji Iwamoto, Naoto Uyama, Saho Irahara, Youichi Otomi, Teruyoshi Kageji, Shinji Nagahiro
PURPOSE: We evaluated the utility of arterial spin labeling (ASL) imaging of tumor blood flow (TBF) for grading non-enhancing astrocytic tumors. MATERIALS AND METHODS: Thirteen non-enhancing astrocytomas were divided into high-grade (n = 7) and low-grade (n = 6) groups. Both ASL and conventional sequences were acquired using the same magnetic resonance machine. Intratumoral absolute maximum TBF (TBFmax), absolute mean TBF (TBFmean), and corresponding values normalized to cerebral blood flow (TBFmax and TBFmean ratios) were measured...
December 12, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29237506/tgf-%C3%AE-1-induced-chondrogenesis-of-bone-marrow-mesenchymal-stem-cells-is-promoted-by-low-intensity-pulsed-ultrasound-through-the-integrin-mtor-signaling-pathway
#18
Peng Xia, Xiaoju Wang, Yanping Qu, Qiang Lin, Kai Cheng, Mingxia Gao, Shasha Ren, Tingting Zhang, Xueping Li
BACKGROUND: Low-intensity pulsed ultrasound (LIPUS) is a mechanical stimulus that plays a key role in regulating the differentiation of bone marrow mesenchymal stem cells (BMSCs). However, the way in which it affects the chondrogenic differentiation of BMSCs remains unknown. In this study, we aimed to investigate whether LIPUS is able to influence TGF-β1-induced chondrogenesis of BMSCs through the integrin-mechanistic target of the Rapamycin (mTOR) signaling pathway. METHODS: BMSCs were isolated from rat bone marrow and cultured in either standard or TGF-β1-treated culture medium...
December 13, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29237495/bone-marrow-cd34-cell-subset-under-induction-of-moderate-stiffness-of-extracellular-matrix-after-myocardial-infarction-facilitated-endothelial-lineage-commitment-in-vitro
#19
Shuning Zhang, Xin Ma, Junjie Guo, Kang Yao, Cong Wang, Zhen Dong, Hong Zhu, Fan Fan, Zheyong Huang, Xiangdong Yang, Juying Qian, Yunzeng Zou, Aijun Sun, Junbo Ge
BACKGROUND: The stiffness of the myocardial extracellular matrix (ECM) and the transplanted cell type are vitally important in promoting angiogenesis. However, the combined effect of the two factors remains uncertain. The purpose of this study is to investigate in vitro the combined effect of myocardial ECM stiffness postinfarction with a bone marrow-derived cell subset expressing or not expressing CD34 on endothelial lineage commitment. METHODS: Myocardial stiffness of the infarct zone was determined in mice at 1 h, 24 h, 7 days, 14 days, and 28 days after coronary artery ligation...
December 13, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29237492/pentosan-polysulfate-binds-to-stro-1-mesenchymal-progenitor-cells-is-internalized-and-modifies-gene-expression-a-novel-approach-of-pre-programing-stem-cells-for-therapeutic-application-requiring-their-chondrogenesis
#20
Jiehua Wu, Susan Shimmon, Sharon Paton, Christopher Daly, Tony Goldschlager, Stan Gronthos, Andrew C W Zannettino, Peter Ghosh
BACKGROUND: The pharmaceutical agent pentosan polysulfate (PPS) is known to induce proliferation and chondrogenesis of mesenchymal progenitor cells (MPCs) in vitro and in vivo. However, the mechanism(s) of action of PPS in mediating these effects remains unresolved. In the present report we address this issue by investigating the binding and uptake of PPS by MPCs and monitoring gene expression and proteoglycan biosynthesis before and after the cells had been exposed to limited concentrations of PPS and then re-established in culture in the absence of the drug (MPC priming)...
December 13, 2017: Stem Cell Research & Therapy
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