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https://www.readbyqxmd.com/read/28239393/thermo-sensitive-polymer-nanospheres-as-a-smart-plugging-agent-for-shale-gas-drilling-operations
#1
Wei-Ji Wang, Zheng-Song Qiu, Han-Yi Zhong, Wei-An Huang, Wen-Hao Dai
Emulsifier-free poly(methyl methacrylate-styrene) [P(MMA-St)] nanospheres with an average particle size of 100 nm were synthesized in an isopropyl alcohol-water medium by a solvothermal method. Then, through radical graft copolymerization of thermo-sensitive monomer N-isopropylacrylamide (NIPAm) and hydrophilic monomer acrylic acid (AA) onto the surface of P(MMA-St) nanospheres at 80 °C, a series of thermo-sensitive polymer nanospheres, named SD-SEAL with different lower critical solution temperatures (LCST), were prepared by adjusting the mole ratio of NIPAm to AA...
2017: Pet Sci
https://www.readbyqxmd.com/read/28235737/integrated-electrochemical-treatment-systems-for-facilitating-the-bioremediation-of-oil-spill-contaminated-soil
#2
Ying Cheng, Liang Wang, Vilma Faustorilla, Mallavarapu Megharaj, Ravi Naidu, Zuliang Chen
Bioremediation plays an important role in oil spill management and bio-electrochemical treatment systems are supposed to represent a new technology for both effective remediation and energy recovery. Diesel removal rate increased by four times in microbial fuel cells (MFCs) since the electrode served as an electron acceptor, and high power density (29.05 W m(-3)) at current density 72.38 A m(-3) was achieved using diesel (v/v 1%) as the sole substrate. As revealed by Scanning electron microscope images, carbon fibres in the anode electrode were covered with biofilm and the bacterial colloids which build the link between carbon fibres and enhance electron transmission...
February 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28231164/essential-oil-characterization-of-thymus-vulgaris-from-various-geographical-locations
#3
Prabodh Satyal, Brittney L Murray, Robert L McFeeters, William N Setzer
Thyme (Thymus vulgaris L.) is a commonly used flavoring agent and medicinal herb. Several chemotypes of thyme, based on essential oil compositions, have been established, including (1) linalool; (2) borneol; (3) geraniol; (4) sabinene hydrate; (5) thymol; (6) carvacrol, as well as a number of multiple-component chemotypes. In this work, two different T. vulgaris essential oils were obtained from France and two were obtained from Serbia. The chemical compositions were determined using gas chromatography-mass spectrometry...
October 27, 2016: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28228233/analyzing-complex-mixtures-of-drug-like-molecules-ion-mobility-as-an-adjunct-to-existing-liquid-chromatography-tandem-mass-spectrometry-methods
#4
Jasper Boschmans, Filip Lemière, Frank Sobott
The use of traveling wave ion mobility mass spectrometry (TWIMS) is evaluated in conjunction with, and as a possible alternative to, conventional LC-MS(/MS) methods for the separation and characterization of drug-like compounds and metabolites. As a model system we use an in vitro incubation mixture of the chemotherapeutic agent melphalan, which results in more than ten closely related hydrolysis products and chain-like oligomers. Ion mobility as a filtering tool results in the separation of ions of interest from interfering ions, based on charge state and shape/size...
February 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28221781/the-relationship-between-organic-loading-and-effects-on-fish-reproduction-for-pulp-mill-effluents-across-canada
#5
Pierre H Martel, Brian I O'Connor, Tibor G Kovacs, Michael R Van Den Heuvel, Joanne L Parrott, Mark E McMaster, Deborah L MacLatchy, Glen J Van Der Kraak, L Mark Hewitt
This study builds upon the work of a multiagency consortium tasked with determining cost effective solutions for the effects of pulp mill effluents on fish reproduction. A laboratory fathead minnow egg production test and chemical characterization tools were used to benchmark eighty-one effluents from twenty mills across Canada, representing the major pulping, bleaching and effluent treatment technologies. For Kraft and mechanical pulp mills, effluents containing less than 20 mg/L BOD5 were found to have the greatest probability of having no effects...
February 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28218528/a-water-stable-anionic-metal-organic-framework-constructed-from-columnar-zinc-adeninate-units-for-highly-selective-light-hydrocarbon-separation-and-efficient-separation-of-organic-dyes
#6
Hui-Fang Ma, Qing-Yan Liu, Yu-Ling Wang, Shun-Gao Yin
A metal-organic framework (MOF), {(Me2NH2)2[Zn6(μ4-O)(ad)4(BPDC)4]}n (JXNU-4; ad(-) = adeninate), with an anionic three-dimensional (3D) framework constructed from one-dimensional (1D) columnar [Zn6(ad)4(μ4-O)]n secondary building units (SBUs) and 4,4'-biphenyldicarboxylate (BPDC(2-)) ligand, was prepared. The anionic 3D framework has 1D square channels with an aperture of about 9.8 Å and exhibits a carboxylate-O-decorated pore environment. The microporous nature of JXNU-4 was established by the N2 adsorption data, which gives Langmuir and Brumauer-Emmett-Teller surface areas of 1800 and 1250 m(2) g(-1), respectively...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28217400/novel-plasma-biomarker-of-atenolol-induced-hyperglycemia-identified-through-a-metabolomics-genomics-integrative-approach
#7
Felipe A de Oliveira, Mohamed H Shahin, Yan Gong, Caitrin W McDonough, Amber L Beitelshees, John G Gums, Arlene B Chapman, Eric Boerwinkle, Stephen T Turner, Reginald F Frye, Oliver Fiehn, Rima Kaddurah-Daouk, Julie A Johnson, Rhonda M Cooper-DeHoff
INTRODUCTION: While atenolol is an effective antihypertensive agent, its use is also associated with adverse events including hyperglycemia and incident diabetes that may offset the benefits of blood pressure lowering. By combining metabolomic and genomic data acquired from hypertensive individuals treated with atenolol, it may be possible to better understand the pathways that most impact the development of an adverse glycemic state. OBJECTIVE: To identify biomarkers that can help predict susceptibility to blood glucose excursions during exposure to atenolol...
August 2016: Metabolomics: Open Access
https://www.readbyqxmd.com/read/28216292/evolutionary-constraints-shaping-streptococcus-pyogenes-host-interactions
#8
REVIEW
Reid V Wilkening, Michael J Federle
Research on the Gram-positive human-restricted pathogen Streptococcus pyogenes (Group A Streptococcus, GAS) has long focused on invasive illness, the most severe manifestations of GAS infection. Recent advances in descriptions of molecular mechanisms of GAS virulence, coupled with massive sequencing efforts to isolate genomes, have allowed the field to better understand the molecular and evolutionary changes leading to pandemic strains. These findings suggest that it is necessary to rethink the dogma involving GAS pathogenesis, and that the most productive avenues for research going forward may be investigations into GAS in its 'normal' habitat, the nasopharynx, and its ability to either live with its host in an asymptomatic lifestyle or as an agent of superficial infections...
February 16, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28214036/impact-of-filling-gas-on-subharmonic-emissions-of-phospholipid-ultrasound-contrast-agents
#9
Emma Kanbar, Damien Fouan, Charles A Sennoga, Alexander A Doinikov, Ayache Bouakaz
Subharmonic signals backscattered from gas-filled lipid-shelled microbubbles have generated significant research interest because they can improve the detection and sensitivity of contrast-enhanced ultrasound imaging. However, the emission of subharmonic signals is strongly characterized by a temporal dependence, the origins of which have not been sufficiently elucidated. The features that influence subharmonic emissions need to be identified not only to better develop next-generation microbubble contrast agents, but also to develop more efficient subharmonic imaging (SHI) modes and therapeutic strategies...
February 14, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28213749/effect-of-continuous-sub-culturing-on-infectivity-of-clostridium-perfringens-atcc13124-in-mouse-gas-gangrene-model
#10
Ravi Bhushan Kumar, Syed Imteyaz Alam
Clostridium perfringens is a Validated Biological Agent and a pathogen of medical, veterinary, and military significance. Gas gangrene is the most destructive of all the clostridial diseases and is caused by C. perfringens type A strains wherein the infection spreads quickly (several inches per hour) with production of gas. Influence of repeated in vitro cultivation on the infectivity of C. perfringens was investigated by comparing the surface proteins of laboratory strain and repository strains of the bacterium using 2DE-MS approach...
February 17, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28209130/determination-of-antibacterial-activity-and-minimum-inhibitory-concentration-of-larval-extract-of-fly-via-resazurin-based-turbidometric-assay
#11
Chien Huey Teh, Wasi Ahmad Nazni, Ab Hamid Nurulhusna, Ahmad Norazah, Han Lim Lee
BACKGROUND: Antimicrobial resistance is currently a major global issue. As the rate of emergence of antimicrobial resistance has superseded the rate of discovery and introduction of new effective drugs, the medical arsenal now is experiencing shortage of effective drugs to combat diseases, particularly against diseases caused by the dreadful multidrug-resistant strains, such as the methicillin-resistant Staphylococcus aureus (MRSA). The ability of fly larvae to thrive in septic habitats has prompted us to determine the antibacterial activity and minimum inhibitory concentrations (MICs) of larval extract of flies, namely Lucilia cuprina, Sarcophaga peregrina and Musca domestica against 4 pathogenic bacteria [Staphylococcus aureus, methicillin-resistant S...
February 16, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28209094/attenuation-of-arsenic-trioxide-induced-cardiotoxicity-through-flaxseed-oil-in-experimental-rats
#12
Mathews V Varghese, M Abhilash, Manju Alex, M V Sauganth Paul, A Prathapan, K G Raghu, R Harikumaran Nair
OBJECTIVES: Arsenic trioxide (As2O3) is a potent drug for acute promyelocytic leukaemia, but its clinical trials are allied with some serious adverse events mainly cardiac functional abnormalities. So the objective of our investigation is to identify the cardioprotective action of flaxseed oil (FSO), a natural compound against As2O3 induced cardiotoxicity. METHODS: Male wistar rats were treated with As2O3 (4 mg/kg) to induce cardiotoxicity. FSO (250 and 500 mg/kg) was given in combination with As2O3 for evaluating its cardioprotective efficacy...
February 17, 2017: Redox Report: Communications in Free Radical Research
https://www.readbyqxmd.com/read/28204886/environmental-and-biological-determination-of-acrolein-using-new-cold-fiber-solid-phase-microextraction-with-gas-chromatography-mass-spectrometry
#13
Cláudia M Dias, Helvécio C Menezes, Zenilda L Cardeal
Acrolein is a pollutant released daily to the indoor environment from different sources. The present study reports the development of a simple and sensitive cold fiber solid phase microextraction sampling method for the determination of acrolein in exhaled air and indoor air by gas chromatography mass spectrometry. O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine was used as derivatizing agent supported on a 65-μm polydimethylsiloxane-divinylbenzene SPME fiber. An acrolein permeation tube at 326.25 ng min(-1) rate was used to generate gaseous standards...
February 15, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28197590/rats-urinary-metabolomes-reveal-the-potential-roles-of-functional-foods-and-exercise-in-obesity-management
#14
Mohamed A Farag, N M Ammar, T E Kholeif, N S Metwally, N M El-Sheikh, Ludger A Wessjohann, A Z Abdel-Hamid
The complexity of the metabolic changes in obese individuals still presents a challenge for the understanding of obesity-related metabolic disruptions and for obesity management. In this study, a gas chromatography mass spectrometry (GC-MS) based metabolomics approach targeting urine metabolism has been applied to assess the potential roles of functional foods and exercise for obesity management in rats. Male albino rats diagnosed as obese via histopathology and biochemical assays were administered functional foods in common use for obesity management including pomegranate, grapefruit, and red cabbage juice extracts in parallel with swimming exercise...
February 15, 2017: Food & Function
https://www.readbyqxmd.com/read/28193304/physiological-response-and-semen-quality-of-rabbit-bucks-supplemented-with-moringa-leaves-ethanolic-extract-during-summer-season
#15
N I El-Desoky, N M Hashem, A Elkomy, Z R Abo-Elezz
Exposure of rabbit bucks to summer heat stress reduces their homeostasis and semen quality leading to a temporal subfertility. The potentiality of ethanolic extract of Moringa oleifera leaves (M. oleifera ethanolic extract (MLEE)) to reduce negative impacts of heat stress on physiological and semen quality traits was investigated. A total of 28 adult V-line rabbit bucks were randomly distributed among four experimental groups of seven rabbits each. The first group received water (placebo) and served as a control (M0)...
February 14, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28190546/sevoflurane-attenuates-ischemia-reperfusion-injury-in-a%C3%A2-rat%C3%A2-lung%C3%A2-transplantation-model
#16
Akihiro Ohsumi, Katherine Marseu, Peter Slinger, Karen McRae, Hyunhee Kim, Zehong Guan, David M Hwang, Mingyao Liu, Shaf Keshavjee, Marcelo Cypel
BACKGROUND: Sevoflurane is one of the most commonly used volatile anesthetic agents with the fastest onset and offset, replacing isoflurane in modern anesthesiology. Preconditioning and postconditioning using volatile anesthetics can attenuate ischemia-reperfusion injury (IRI). However, no previous studies have evaluated the effect of sevoflurane in lung transplantation after cold ischemic injury. We aimed to study the effects of donor and recipient treatment with sevoflurane in a rat lung transplantation model...
February 9, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28180989/development-of-a-new-colorimetric-assay-for-detection-of-bisphenol-a-in-aqueous-media-using-green-synthesized-silver-chloride-nanoparticles-experimental-and-theoretical-study
#17
Shiva Khalililaghab, Safieh Momeni, Maryam Farrokhnia, Iraj Nabipour, Sadegh Karimi
In the present study, a cost-effective, green and simple synthesis method was applied for preparation of stable silver chloride nanoparticles (AgCl-NPs). The method was done by forming AgCl-NPs from Ag(+) ions using aqueous extract of brown algae (Sargassum boveanum) obtained from the Persian Gulf Sea. This extract served as capping agent during the formation of AgCl-NPs. Creation of AgCl-NPs was confirmed by UV-visible spectroscopy, powder X-ray diffraction, energy-dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy, while the morphology and size analyses were characterized using high-resolution transmission electron microscopy and dynamic light scattering...
February 8, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28168839/histamine-h3-receptor-antagonist-prevents-memory-deficits-and-synaptic-plasticity-disruption-following-isoflurane-exposure
#18
Tao Luo, Ying Wang, Jian Qin, Zhi-Gang Liu, Min Liu
BACKGROUND: Exposure to pharmacological concentration of inhaled anesthetics such as isoflurane can cause short- or long-term cognitive impairments in preclinical studies. The selective antagonists of the histamine H3 receptors are considered as a promising group of novel therapeutic agents for the treatment of cognitive disorders. In this study, we investigated whether ciproxifan, a nonimidazole antagonist of H3 histamine receptors, could overcome the functional and electrophysiological sequela associated with isoflurane anesthesia...
February 6, 2017: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/28166694/novel-developments-in-foam-sclerotherapy-focus-on-varithena%C3%A2-polidocanol-endovenous-microfoam-in-the-management-of-varicose-veins
#19
Phoebe Star, David E Connor, Kurosh Parsi
Scope Varithena® is a recently approved commercially available drug/delivery unit that produces foam using 1% polidocanol for the management of varicose veins. The purpose of this review is to examine the benefits of foam sclerotherapy, features of the ideal foam sclerosant and the strengths and limitations of Varithena® in the context of current foam sclerotherapy practices. Method Electronic databases including PubMed, Medline (Ovid) SP as well as trial registries and product information sheets were searched using the keywords, 'Varithena', 'Varisolve', 'polidocanol endovenous microfoam', 'polidocanol' and/or 'foam sclerotherapy/sclerosant'...
January 1, 2017: Phlebology
https://www.readbyqxmd.com/read/28165200/selective-production-of-2-methylfuran-by-gas-phase-hydrogenation-of-furfural-on-copper-incorporated-by-complexing-to-mesoporous-silica-catalysts
#20
Carmen Pilar Jiménez-Gómez, Juan A Cecilia, Ramón Moreno-Tost, Pedro Maireles-Torres
Copper species have been incorporated to a mesoporous silica by complexing with amino group of dodecylamine molecules, used as structure-directing agent in the synthesis. A series of Cu/SiO2 catalysts, with copper loadings from 2.5 to 20 wt%, has been synthesized and evaluated in the gas phase hydrogenation of furfural. The most suitable catalytic performance, in terms of 2-methylfuran yield, has been found for intermediate copper content (10 wt%). In this sense, the 10Cu-MS catalyst, at a reaction temperature of 210ºC, after 5 h of time-on-stream, exhibits a 2-methylfuran yield higher than 95 mol%, with a H2:FUR molar ratio of 11...
February 6, 2017: ChemSusChem
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