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https://www.readbyqxmd.com/read/28324849/oil-loving-hydrophobic-gels-made-from-glycerol-propoxylate-efficient-and-reusable-sorbents-for-oil-spill-clean-up
#1
Soner Kizil, Hayal Bulbul Sonmez
Glycerol propoxylate based oil loving sorbents were prepared through bulk polymerization, without using of an activator, initiator, or catalyst. Fourier transform infrared spectroscopy (FTIR), (13)C and (29)Si CPMAS nuclear magnetic resonance (NMR), as well as elemental analysis and thermal gravimetric analysis (TGA) were operated in order to identify the structural and thermal features of sorbents. The synthesized gels were employed as absorbents for various organic solvents and oils. The swelling capacity, absorption-desorption kinetics, reusability, and selective removal from an oil/water mixture were also examined...
March 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28323877/thermal-analysis-during-partial-carbonizing-process-of-rhubarb-moutan-and-burnet
#2
Junnan Ma, Xianglong Meng, Xiaohui Guo, Yaru Lan, Shuosheng Zhang
Control of temperature and duration of partial carbonization for Chinese medicines have been mainly based on experience of the processors. No quantitative methods and parameters are available that can be used to precisely control the temperature and determine the energy changes during the process. In our research, with a simulated atmosphere air condition, the partial carbonization processes of three Chinese herb medicines rhubarb, moutan and burnet were simulated at different heating rates (5, 10 and 20°C • min-1) and analyzed by thermal gravimetric analysis (TGA) to quantify the upper limits of the temperature...
2017: PloS One
https://www.readbyqxmd.com/read/28320150/additional-evidence-supports-association-of-common-genetic-variants-in-vti1a-and-etfa-with-increased-risk-of-glioma-susceptibility
#3
Ning Wang, Zhong Deng, Maode Wang, Ruichun Li, Gaofeng Xu, Gang Bao
BACKGROUND: VTI1A and ETFA were identified recently as susceptibility genes for non-glioblastoma (GBM) of glioma risk in European populations, but the genetic etiology and pathogenesis of glioma have not been fully elucidated. Here, we aimed to investigate whether common genetic variants in VTI1A and ETFA predispose Han Chinese individuals to glioma. METHODS: The association of thirteen common tagging single nucleotide polymorphisms (SNPs) in VTI1A and ETFA genes with glioma were assessed in a hospital-based case-control study including 473 non-GBM of glioma patients and 1046 cancer-free controls...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28319772/thermochemical-conversion-pathways-of-kappaphycus-alvarezii-granules-through-study-of-kinetic-models
#4
Prasanta Das, Dibyendu Mondal, Subarna Maiti
Kappaphycus alvarezii seaweed belongs to the class of red alga (Rhodophyta). The granules obtained after recovery of "sap" (liquid plant stimulant) from freshly harvested alga is a promising biomass feedstock for energy application. Herein we report the kinetic behaviour of the granules using thermogravimetric analysis (TGA) at different heating rates in N2 atmosphere and thermogravimetric-mass spectrometry (TG-MS) analysis. Sawdust as lignocellulosic biomass is considered for comparative study. Four different kinetic models (i) multilinear regression technique, (ii) Friedman method, (iii) Flynn-Wall-Ozawa (FWO) method and (iv) Kissinger-Akahira-Sunose (KAS) method are used to evaluate the apparent activation energy (Ea), the pre-exponential factor (Aα) and the overall reaction order (n)...
March 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28318247/metalized-nanocellulose-composites-as-a-feasible-material-for-membrane-supports-design-and-applications-for-water-treatment
#5
Perla Cruz-Tato, Edwin O Ortiz-Quiles, Karlene Vega-Figueroa, Liz Noemi Santiago-Martoral, Michael Flynn, Liz M Diaz-Vazquez, Eduardo Nicolau
Herein, we study the feasibility of using nanocellulose (NC)-based composites with silver and platinum nanoparticles as additive materials to fabricate the support layer of thin film composite (TFC) membranes for water purification applications. In brief, the NC surface was chemically modified and then was decorated with silver and platinum nanoparticles, respectively by chemical reduction. These metalized nanocellulose composites (MNC) were characterized by several techniques including: FTIR, XPS, TGA, XRD and XANES to probe their integrity...
March 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28315602/synergistic-effect-on-co-gasification-reactivity-of-biomass-petroleum-coke-blended-char
#6
Juntao Wei, Qinghua Guo, Yan Gong, Lu Ding, Guangsuo Yu
In this work, effects of gasification temperature (900°C-1100°C) and blended ratio (3:1, 1:1, 1:3) on reactivity of petroleum coke and biomass co-gasification were studied in TGA. Quantification analysis of active AAEM transformation and in situ investigation of morphological structure variations in gasification were conducted respectively using inductively coupled plasma optical emission spectrometer and heating stage microscope to explore synergistic effect on co-gasification reactivity. The results indicated that char gasification reactivity was enhanced with increasing biomass proportion and gasification temperature...
March 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28314145/preparation-of-polyhedral-oligomeric-silsesquioxane-based-cross-linked-inorganic-organic-nanohybrid-as-adsorbent-for-selective-removal-of-acidic-dyes-from-aqueous-solution
#7
Jiawei Liu, Heng Yu, Qingmei Liang, Yanna Liu, Jiwei Shen, Quan Bai
A cross-linked polyhedral oligomeric silsesquioxane (POSS) nanohybrid is synthesized through Schiff base chemistry by using octa-amino POSS as building blocks and glutaraldehyde as dual functional reagent. The obtained nanohybrid is characterized by FT-IR, solid-state (29)Si NMR, SEM, TEM, TGA and N2 adsorption-desorption isotherm, and the results demonstrate the successful cross-linkage between POSS molecules, forming block-like irregular nanoparticles with a specific surface area of 42.8m(2)g(-1). As a novel solid-phase adsorbent, cross-linked POSS nanohybrid exhibits selective adsorption properties for acidic dyes, i...
March 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28314144/hydrophobicity-and-polymer-compatibility-of-poss-modified-wyoming-na-montmorillonite-for-developing-polymer-clay-nanocomposites
#8
Rustam Hojiyev, Yusuf Ulcay, Mirabbos Hojamberdiev, Mehmet S Çelik, William M Carty
The aim of the present work was to investigate the hydrophobicity and polymer compatibility of aminopropylisooctyl polyhedral oligomeric silsequioxane (POSS) - modified Na-montmorillonite (Na-MMT) towards developing polymer-clay nanocomposites. The effect of different concentrations of POSS on properties of Na-MMT was studied. The intercalation ability of the POSS molecules into the Na-MMT interlayer was analyzed by X-ray diffraction. It was found that the d001 value was increased with increasing the POSS concentration, indicating the successful intercalation of the POSS molecules into the Na-MMT interlayer...
March 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28302982/selective-and-sensitive-detection-of-silver-i-ion-based-on-tetracationic-complex-and-tga-gsh-co-capped-quantum-dots-as-an-effective-fluorescent-sensing-platform
#9
Xue-Wen Liu, Jun-Shi Shu, Yang Xiao, Yang Yang, Song-Bai Zhang
CdTe quantum dots capped with glutathione (GSH) and thioglycolic acid (TGA) were synthesized and the interaction between QDs and tetracationic Fe complex was investigated. Based on the specific interaction between Ag(+) and cytosine bases (C), we designed a label-free DNA sensor for the detection of Ag(+) in aqueous solution. Furthermore, tetracationic Fe complex with a higher positive charge is demonstrated to improve the sensitivity of the sensor. A detection limit of 3.3 nmol dm(-3) was obtained, which was lower than in previous reports...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28300589/epichlorohydrin-crosslinked-carboxymethyl-cellulose-ethylenediamine-imprinted-polymer-for-the-selective-uptake-of-cr-vi
#10
Tarisai Velempini, Kriveshini Pillay, Xavier Y Mbianda, Omotayo A Arotiba
A new ion-imprinted polymer (IIP) was synthesized from sodium carboxymethyl cellulose and used for the adsorption of hexavalent chromium from aqueous solution. Epichlorohydrin was used to stabilize the polymer before ethylenediamine (EDA) ligand and Cr(VI) were introduced. The obtained IIP was characterized with FTIR, XPS, TGA,(13)C NMR, SEM, EDX, BET and zeta sizer. The kinetics of adsorption followed a pseudo-second-order model while the Langmuir adsorption isotherm provided the best fit with a maximum adsorption capacity of 177...
March 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28300588/immobilization-of-chitosan-nanolayers-on-the-surface-of-nano-titanium-oxide-as-a-novel-nanocomposite-for-efficient-removal-of-la-iii-from-water
#11
Mohamed E Mahmoud, Samir A A Abou Ali, Ahmed M G Nassar, Shimaa M T Elweshahy, Somia B Ahmed
A novel nanocomposite has been designed and synthesized via surface crosslinking of chitosan nanolayers (NChit) with titanium oxide nanoparticles (NTiO2) using glutaraldehyde (Glu) as the crosslinking agent. A simple and green surface chemical reaction was accomplished by the aid of microwave heating process to enforce surface encapsulation and functionalization for the production of the aimed NTiO2-Glu-NChit nanocomposite. The average particles size of nanocomposite was characterized in the range of 52-58nm using SEM and confirmed by the HR-TEM...
March 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28295809/a-new-method-to-predict-the-need-for-a-rashkind-procedure-in-fetuses-with-dextro-transposition-of-the-great-arteries
#12
Maciej Słodki, Roland Axt-Fliedner, Katarzyna Zych-Krekora, Aline Wolter, Andreea Kawecki, Christian Enzensberge, Ewa Gulczyńska, Maria Respondek-Liberska
OBJECTIVE: Prenatal congenital heart disease classification system specify critical d-TGA with restriction of the foramen ovale (which requires Rashkind procedure) and planned d-TGA. However, current prenatal diagnostic criteria for post-delivery foramen ovale (FO) restriction in d-TGA are inadequate, resulting in a high false negative rate. We aim to find an echocardiographic features to predict the need for Rashkind procedure. METHODS: 98 patients from 2 European centers diagnosed prenatally with fetal d-TGA from 2006 to 2013 were analyzed and two groups were compared: 1) those in which the Rashkind procedure was performed within the first 24 hours of life; and 2) those who did not undergo a Rashkind procedure before cardiac surgery...
March 14, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28294623/characterization-of-the-physicochemical-properties-of-%C3%AE-cyclodextrin-divinyl-sulfone-polymer-carrier-bile-acid-systems
#13
Mohamed H Mohamed, Chen Wang, Kerry M Peru, John V Headley, Lee D Wilson
Herein, we report on the systematic design and characterization of cross-linked polymer carriers containing β-cyclodextrin (β-CD) and divinyl sulfone (DVS). The polymer carriers were prepared at variable feed ratios (β-CD-DVS; 1:1, 1:2, 1:3 and 1:6) and characterized using spectroscopy (IR, 1H solution NMR, 13C CP-MAS solids NMR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and a dye decolorization method using phenolphthalein. Uptake studies were carried out at pH 9.00 for the polymer carriers using single component bile acids (cholic acid; deoxycholic acid; glycodeoxycholic acid; and taurodeoxycholic acid)...
March 15, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28292729/pre-analytical-effects-of-pneumatic-tube-system-transport-on-routine-haematology-and-coagulation-tests-global-coagulation-assays-and-platelet-function-assays
#14
Sandra Le Quellec, Mickaël Paris, Christophe Nougier, Frédéric Sobas, Lucia Rugeri, Sandrine Girard, Jean-Claude Bordet, Claude Négrier, Yesim Dargaud
INTRODUCTION: Pneumatic tube system (PTS) in hospitals is commonly used for the transport of blood samples to clinical laboratories, as it is rapid and cost-effective. The aim was to compare the effects on haematology samples of a newly acquired ~2km-long PTS that links 2 hospitals with usual transport (non-pneumatic tube system, NPTS). METHODS: Complete blood cell count, routine coagulation assays, platelet function tests (PFT) with light-transmission aggregometry and global coagulation assays including ROTEM® and thrombin generation assay (TGA) were performed on blood samples from 30 healthy volunteers and 9 healthy volunteers who agreed to take aspirin prior to blood sampling...
December 28, 2016: Thrombosis Research
https://www.readbyqxmd.com/read/28291225/reduced-graphene-oxide-composites-with-water-soluble-copolymers-having-tailored-lower-critical-solution-temperatures-and-unique-tube-like-structure
#15
Mina Namvari, Chandra S Biswas, Massimiliano Galluzzi, Qiao Wang, Bing Du, Florian J Stadler
Nanohybrids of graphene with water soluble polymer were synthesized using 'grafting from' method. GO, prepared by modified Hummers' method, was first reacted with sodium azide. Alkyne-terminated RAFT-CTA was synthesized by reaction of propargyl alcohol and S-1-dodecyl-S'-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate. RAFT-CTA was grafted onto the GO sheets by facile click-reaction and subsequently, N-isopropylacrylamide (NIPAM) and N-ethyleacrylamide (NEAM) were polymerized on graphene sheets via RAFT polymerization method...
March 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28288420/molecular-characteristics-of-water-extractable-organic-matter-from-different-composted-biomasses-and-their-effects-on-seed-germination-and-early-growth-of-maize
#16
Hiarhi Monda, Vincenza Cozzolino, Giovanni Vinci, Riccardo Spaccini, Alessandro Piccolo
Four water extractable organic matter (WEOM) were obtained from composts made out of residues of: 1. artichoke (C-CYN), 2. artichoke/fennel (C-CYNF), 3. tomato/woodchips (C-TOM), 4. Municipal solid waste (C-MSW), and their bioactivity was tested for maize seed germination and maize seedling growth. The molecular properties of both original composts and their WEOM were characterized by spectroscopic ((13)C-CPMAS- and (1)H NMR, FTIR-ATR), thermochemolysis-GC/MS, and thermal methods (TGA, DSC). While all WEOM had significant effects on plant growth, CYN-WEOM was the only material that concomitantly increased germination rate and primary and lateral root length of maize seedlings...
March 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28285051/cyclodextrin-functionalized-mesostructured-silica-nanoparticles-for-removal-of-polycyclic-aromatic-hydrocarbons
#17
Fuat Topuz, Tamer Uyar
Polycyclic aromatic hydrocarbons (PAHs) are the byproducts of the incomplete combustion of carbon-based fuels, and have high affinity towards DNA strands, ultimately exerting their carcinogenic effects. They are ubiquitousenvironmental contaminants,and can accumulate on tissues due to their lipophilic nature. In this article, we describe a novel concept for PAH removal from aqueous solutions using cyclodextrin-functionalized mesostructured silica nanoparticles (CDMSNs) and pristine mesostructured silica nanoparticles (MSNs)...
March 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28285049/adsorption-and-release-of-ampicillin-antibiotic-from-ordered-mesoporous-silica
#18
Valentina Nairi, Luca Medda, Maura Monduzzi, Andrea Salis
In this work the adsorption and the release of ampicillin - a β-lactam penicillin-like antibiotic - from MCM-41, SBA-15, and (amino functionalized) SBA-15-NH2 ordered mesoporous silica (OMS) materials were investigated. The silica matrices differ for their pore size (SBA-15 vs. MCM-41) mainly, and also for surface charge (SBA-15 and MCM-41, vs. SBA-15-NH2). OMS samples were characterized through small-angle X-rays scattering (SAXS), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and potentiometric titrations...
March 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28284158/synthesis-spectroscopic-dft-and-in-vitro-biological-studies-of-vanadium-iii-complexes-of-aryldithiocarbonates
#19
Savit Andotra, Sandeep Kumar, Mandeep Kour, Vikas, Chayawan, Vishal Sharma, Sundeep Jaglan, Sushil K Pandey
Vanadium(III) tris(dithiocarbonates), [(ROCS2)3V] (R=o-, m-, p-CH3C6H4 and 4-Cl-3-CH3C6H3) and donor stabilized addition complexes [(ROCS2)2V(Cl)·L] [L=NC5H5 or P(C6H5)3] were synthesized and characterized by elemental analyses, IR, mass, TGA/DTA, SEM magnetic susceptibility and heteronuclear NMR ((1)H, (13)C and (31)P) spectroscopic studies. The cytotoxicity of the complexes was measured in vitro using the cultivated human cell lines. In addition, the antioxidant activities of the ligands and its vanadium complexes were also investigated through their scavenging effect on DPPH radicals...
March 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28283455/synthesis-of-water-dispersible-poly-l-lysine-functionalized-magnetic-fe3o4-go-mwcnts-nanocomposite-hybrid-with-a-large-surface-area-for-high-efficiency-removal-of-tartrazine-and-pb-ii
#20
Dan Hu, Xiaodong Wan, Xiaohui Li, Jianguo Liu, Chunhua Zhou
In this study, a novel, effective and environment-friendly methods was used to prepare poly-l-lysine (PLL)-functionalized magnetic Fe3O4-(GO-MWCNTs) hybrid composite with large surface area and abundant hydroxyl and amino groups. The as-prepared PLL-Fe3O4-(GO-MWCNTs) nanocomposite was systematically characterized by FT-IR, XRD, TGA, SEM, TEM, VSM and EDX. The PLL-Fe3O4-(GO-MWCNTs) hybrid composite exhibited excellent adsorption performance for the removal of a dye (tartrazine) and a heave metal (Pb(II)). The result showed that adsorption of Pb(II) reached equilibrium in 30min and adsorption of tartrazine reached equilibrium in approximately 60min...
March 7, 2017: International Journal of Biological Macromolecules
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