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https://www.readbyqxmd.com/read/28728031/applying-a-modified-donnan-model-to-describe-the-surface-complexation-of-chromate-to-iron-oxyhydroxide-agglomerates-with-heteromorphous-pores
#1
Zongsu Wei, Raphael Semiat
In this study, a modified Donnan model (mDM) is incorporated into surface complexation model (SCM) to better understand the physicochemical processes for adsorption of hexavalent chromium, Cr(VI), on porous iron oxyhydroxide agglomerates (IOAs). The mDM includes a chemical potential term μatt to account for ionic transport and electrostatic interaction in micropores (dmi<2nm) which is usually neglected in typical Donnan model (tDM). To estimate the parameters of mDM in a simple and accurate way, a rigorous protocol was presented...
July 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28728004/effects-of-aspect-ratio-of-multi-walled-carbon-nanotubes-on-coal-washery-waste-water-treatment
#2
Ahmed Aliyu, Ishaq Kariim, Saka Ambali Abdulkareem
The dependency of adsorption behaviour on the aspect ratio of multi-walled carbon nanotubes (MWCNTs) has been explored. In this study, effect of growth temperature on yield and aspect ratio of MWCNTs by catalytic chemical vapour deposition (CCVD) method is reported. The result revealed that yield and aspect ratio of synthesised MWCNTs strongly depend on the growth temperature during CCVD operation. The resulting MWCNTs were characterized by High Resolution Transmission Electron Microscope (HRTEM), Dynamic Light Scattering (DLS) and X-ray diffraction (XRD) techniques to determine it diameter, hydrodynamic diameter and crystallinity respectively...
July 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28726936/dithiolato-and-halogenido-bridged-nickel-iron-complexes-related-to-the-active-site-of-nife-h2ases-preparation-structures-and-electrocatalytic-h2-production
#3
Li-Cheng Song, Xiao-Feng Han, Wei Chen, Jia-Peng Li, Xu-Yong Wang
A new series of the structural and functional models for the active site of [NiFe]-H2ases has been prepared by a simple and convenient synthetic route. Thus, treatment of diphosphines RN(PPh2)2 (1a, R = p-MeC6H4CH2; 1b, R = EtO2CCH2) with an equimolar NiCl2·6H2O, NiBr2·3H2O, and NiI2 in refluxing CH2Cl2/MeOH or EtOH gave the mononuclear Ni complexes RN(PPh2)2NiX2 (2a, R = p-MeC6H4CH2, X = Cl; 2b, R = EtO2CCH2, X = Cl; 3a, R = p-MeC6H4CH2, X = Br; 3b, R = EtO2CCH2, X = Br; 4a, R = p-MeC6H4CH2, X = I; 4b, R = EtO2CCH2, X = I) in 67-97% yields...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28726395/synthesis-and-mechanism-of-formation-of-hydride-sulfide-complexes-of-iron
#4
Nicholas A Arnet, Sean F McWilliams, Daniel E DeRosha, Brandon Q Mercado, Patrick L Holland
Iron-sulfide complexes with hydride ligands provide an experimental precedent for spectroscopically detected hydride species on the iron-sulfur MoFe7S9C cofactor of nitrogenase. In this contribution, we expand upon our recent synthesis of the first iron sulfide hydride complex from an iron hydride and a sodium thiolate ( Arnet, N. A.; Dugan, T. R.; Menges, F. S.; Mercado, B. Q.; Brennessel, W. W.; Bill, E.; Johnson, M. A.; Holland, P. L., J. Am. Chem. Soc. 2015 , 137 , 13220 - 13223 ). First, we describe the isolation of an analogous iron sulfide hydride with a smaller diketiminate supporting ligand, which benefits from easier preparation of the hydride precursor and easier isolation of the product...
July 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28725638/isolation-of-f-novicida-containing-phagosome-from-infected-human-monocyte-derived-macrophages
#5
Valentina Marecic, Olga Shevchuk, Mateja Ozanic, Mirna Mihelcic, Michael Steinert, Antonija Jurak Begonja, Yousef Abu Kwaik, Marina Santic
Francisella is a gram-negative bacterial pathogen, which causes tularemia in humans and animals. A crucial step of Francisella infection is its invasion of macrophage cells. Biogenesis of the Francisella-containing phagosome (FCP) is arrested for ~15 min at the endosomal stage, followed by gradual bacterial escape into the cytosol, where the microbe proliferates. The crucial step in pathogenesis of tularemia is short and transient presence of the bacterium within phagosome. Isolation of FCPs for further studies has been challenging due to the short period of time of bacterial residence in it and the characteristics of the FCP...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28724289/deuterohemin-peptide-enzyme-mimic-embedded-metal-organic-frameworks-through-biomimetic-mineralization-with-efficient-atrp-catalytic-activity
#6
Wei Jiang, Xinghuo Wang, Jiawen Chen, Ying Liu, Haobo Han, Yi Ding, Quanshun Li, Jun Tang
An enzyme mimic harboring iron porphyrin (DhHP-6) embedded in zeolite imidazolate framework-8 (ZIF-8) was constructed through biomimetic mineralization approach to obtain the composite DhHP-6@ZIF-8. The composite was then used as catalyst in the ATRP of poly(ethylene glycol) methyl ether methacrylate (PEGMA500) in which poly(PEGMA500) could be synthesized with monomer conversion of 76.1% and Mn of 45,900 g/mol, stronger than free DhHP-6 as catalyst. More importantly, it could efficiently overcome the drawbacks of free DhHP-6 and achieve the easy separation of DhHP-6 from the catalytic system and the elimination of iron residues in the synthesized polymer...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28724166/iron-pharmacokinetics-in-women-with-iron-deficiency-anaemia-following-a-single-oral-dose-of-a-novel-formulation-of-tardyferon-prolonged-release-ferrous-sulphate
#7
Andrew Leary, Laurence Barthe, Thierry Clavel, Claudie Sanchez, Zahida Issiakhem, Bruno Paillard, Jean-Marc Edmond
Numerous iron-containing preparations are available on the market; these vary in dosage, salt, chemical state of iron (ferric or ferrous) and in the iron delivery process (immediate or prolonged-release). Tardyferon® is a prolonged-release tablet containing 80 mg ferrous sulphate. The formulation has recently been modified; changes to the excipients which constitute the inert formulation matrix have allowed a decrease in tablet size for easier swallowing. The aim of this multicenter open-label study was to characterize the serum pharmacokinetics of iron in non-pregnant women aged 23-45 years with iron deficiency anaemia (IDA) following single oral administration of 160 mg Tardyferon® under fasting conditions...
July 19, 2017: Drug Research
https://www.readbyqxmd.com/read/28723064/doxorubicin-intracellular-remote-release-from-biocompatible-oegma-based-magnetic-nanogels-triggered-by-magnetic-hyperthermia
#8
Esther Cazares-Cortes, Ana Espinosa, Jean-Michel Guigner, Aude Michel, Nébéwia Griffete, Claire Wilhelm, Christine Menager
Hybrid nanogels, composed of thermoresponsive polymers and superparamagnetic nanoparticles (MNPs) are attractive nanocarriers for biomedical applications, being able - as polymer matrix - to uptake and release high quantities of chemotherapeutic agents and - as magnetic nanoparticles - to heat when exposed to an alternative magnetic field (AMF), better known as magnetic hyperthermia. Herein, biocompatible, pH-, magnetic- and thermo-responsive nanogels, based on oligo (ethylene glycol) methacrylate monomers (OEGMAs) and methacrylic acid co-monomer (MAA) were prepared by conventional precipitation radical co-polymerization in water, post-assembled by complexation with iron oxide magnetic nanoparticles (MNPs) of maghemite (-Fe2O3) and loaded with an anticancer drug (doxorubicin - DOX), for remotely controlled drug release by "hot-spot", as an athermal magnetic hyperthermia strategy against cancer...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28722538/dispersed-synthesis-of-uniform-fe3o4-magnetic-nanoparticles-via-in-situ-decomposition-of-iron-precursor-along-cotton-fiber-for-sudan-dyes-analysis-in-food-samples
#9
Yassine Bentahir, Said Elmarhoum, Rachid Salghi, Manuel Algarra, Angel Ríos, Mohammed Zougagh
Fe3O4 magnetic nanoparticles, with a negative charge surface, are known to have efficient adsorbent properties, but they tend to be agglomerated into larger aggregates or flocs, which can cause loss of specific area. The addition of cotton fiber, as a stabilizer in preparation of the Fe3O4 nanoparticles, is able to efficiently reduce particle aggregation, and thus, effective particle size, resulting in much greater specific surface area and adsorption sites. Fe3O4 nanoparticles synthesis was accomplished by in-situ high temperature decomposition of the precursor ferric ion in the presence of cotton fiber and ethylene glycol solvent...
July 19, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28722393/multiligand-metal-phenolic-assembly-from-green-tea-infusions
#10
Md Arifur Rahim, Mattias Björnmalm, Nadja Bertleff-Zieschang, Yi Ju, Srinivas Mettu, Michael G Leeming, Frank Caruso
The synthesis of hybrid functional materials using the coordination-driven assembly of metal-phenolic networks (MPNs) is of interest in diverse areas of materials science. To date, MPN assembly has been explored as monoligand systems (i.e., containing a single type of phenolic ligand) where the phenolic components are primarily obtained from natural sources via extraction, isolation, and purification processes. Herein, we demonstrate the fabrication of MPNs from a readily available, crude phenolic source-green tea (GT) infusions...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28721605/how-to-provide-gadolinium-free-pet-mr-cancer-staging-of-children-and-young-adults-in-less-than-1%C3%A2-h-the-stanford-approach
#11
Anne M Muehe, Ashok J Theruvath, Lillian Lai, Maryam Aghighi, Andrew Quon, Samantha J Holdsworth, Jia Wang, Sandra Luna-Fineman, Neyssa Marina, Ranjana Advani, Jarrett Rosenberg, Heike E Daldrup-Link
PURPOSE: To provide clinically useful gadolinium-free whole-body cancer staging of children and young adults with integrated positron emission tomography/magnetic resonance (PET/MR) imaging in less than 1 h. PROCEDURES: In this prospective clinical trial, 20 children and young adults (11-30 years old, 6 male, 14 female) with solid tumors underwent 2-deoxy-2-[(18)F]fluoro-D-glucose ([(18)F]FDG) PET/MR on a 3T PET/MR scanner after intravenous injection of ferumoxytol (5 mg Fe/kg) and [(18)F]FDG (2-3 MBq/kg)...
July 18, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28717421/isolation-of-membrane-vesicles-from-prokaryotes-a-technical-and-biological-comparison-reveals-heterogeneity
#12
Priscila Dauros Singorenko, Vanessa Chang, Alana Whitcombe, Denis Simonov, Jiwon Hong, Anthony Phillips, Simon Swift, Cherie Blenkiron
Prokaryotes release membrane vesicles (MVs) with direct roles in disease pathogenesis. MVs are heterogeneous when isolated from bacterial cultures so Density Gradient Centrifugation (DGC) is valuable for separation of MV subgroups from contaminating material. Here we report the technical variability and natural biological heterogeneity seen between DGC preparations of MVs for Mycobacterium smegmatis and Escherichia coli and compare these DGC data with size exclusion chromatography (SEC) columns. Crude preparations of MVs, isolated from cultures by ultrafiltration and ultracentrifugation were separated by DGC with fractions manually collected as guided by visible bands...
2017: Journal of Extracellular Vesicles
https://www.readbyqxmd.com/read/28710499/a-facile-synthetic-strategy-for-iron-aniline-based-non-precious-metal-catalysts-for-polymer-electrolyte-membrane-fuel-cells
#13
Hyunjoon Lee, Min Jeong Kim, Taeho Lim, Yung-Eun Sung, Hyun-Jong Kim, Ho-Nyun Lee, Oh Joong Kwon, Yong-Hun Cho
The development of a low cost and highly active alternative to the commercial Pt/C catalysts used in the oxygen reduction reaction (ORR) requires a facile and environmentally-friendly synthesis process to facilitate large-scale production and provide an effective replacement. Transition metals, in conjunction with nitrogen-doped carbon, are among the most promising substitute catalysts because of their high activity, inexpensive composition, and high carbon monoxide tolerance. We prepared a polyaniline-derived Fe-N-C catalyst for oxygen reduction using a facile one-pot process with no additional reagents...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709373/one-pot-synthesis-of-magnetic-iron-oxide-nanoparticle-multiwalled-carbon-nanotube-composites-for-enhanced-removal-of-cr-vi-from-aqueous-solution
#14
Wenhui Lu, Jinhua Li, Yanqing Sheng, Xinshen Zhang, Jinmao You, Lingxin Chen
Magnetic nanoparticle-multiwalled carbon nanotubes composites (MNP/MWCNTs) were prepared using 1,6-hexanediamine functionalized Fe3O4 nanoparticles (MNP) linked to carboxylic MWCNTs by facile one-pot solvothermal synthesis for highly efficient removal of Cr(VI) from aqueous solution. The easily obtained magnetic nanocomposites were systematically characterized, and several major factors affecting the adsorption-based removal were investigated, including solution pH, adsorbent dosage, temperature and contact time...
July 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28708983/preparation-of-nanoscale-iron-oxide-oxyhydroxides-and-zero-valent-particles-derived-from-blueberries-reactivity-characterization-and-removal-mechanism-of-arsenate
#15
Karen Manquián-Cerda, Edgardo Cruces, María Angélica Rubio, Camila Reyes, Nicolás Arancibia-Miranda
The application of iron nanoparticles (FeNPs) to the removal of various pollutants has received wide attention over the last few decades. A synthesis alternative to obtain these nanoparticles without using harmful chemical reagents, such as NaBH4, is the use of extracts from different natural sources that allow a lesser degree of agglomeration, in a process known as green synthesis. In this study, FeNPs were synthesized by 'green' (hereafter, BB-Fe NPs) and 'chemical' (hereafter, nZVI) methods. Extracts of leaves and blueberry shoots (Vaccinium corymbosum) were used as reducing agents for FeCl3·6H2O solution in the green synthesis method...
July 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28708624/fe-fes2-adsorbent-prepared-with-iron-powder-and-pyrite-by-facile-ball-milling-and-its-application-for-arsenic-removal
#16
Xiaobo Min, Yangwenjun Li, Yong Ke, Meiqing Shi, Liyuan Chai, Ke Xue
Arsenic is one of the major pollutants and a worldwide concern because of its toxicity and chronic effects on human health. An adsorbent of Fe-FeS2 mixture for effective arsenic removal was successfully prepared by mechanical ball milling. The products before and after arsenic adsorption were characterized with scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The adsorbent shows high arsenic removal efficiency when molar ratio of iron to pyrite is 5:5...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28708324/ferrichrome-has-found-its-match-biomimetic-analogs-with-diversified-activity-map-discrete-microbial-targets
#17
Jenny Besserglick, Evgenia Olshvang, Agnieszka Szebesczyk, Joseph Englander, Dana Levinson, Yitzhak Hadar, Elzbieta Gumienna-Kontecka, Abraham Shanzer
Siderophores provide an established platform for studying molecular recognition principles in biological systems. Herein we describe the preparation of ferrichrome biomimetic analogs varying in length and polarity of the amino acid chain separating between the tripodal scaffold and the pendent FeIII chelating hydroxamic acid groups. Spectroscopic and potentiometric titrations determined their iron affinity to be within the range of efficient chelators. Microbial growth promotion and iron uptake studies were conducted on E...
July 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28706428/appropriateness-of-the-study-of-iron-deficiency-anemia-prior-to-referral-for-small-bowel-evaluation-at-a-tertiary-center
#18
Jaime Pereira Rodrigues, Rolando Pinho, Joana Silva, Ana Ponte, Mafalda Sousa, João Carlos Silva, João Carvalho
AIM: To evaluate the adequacy of the study of iron deficiency anemia (IDA) in real life practice prior to referral to a gastroenterology department for small bowel evaluation. METHODS: All consecutive patients referred to a gastroenterology department for small bowel investigation due to iron deficiency anemia, between January 2013 and December 2015 were included. Both patients referred from general practitioners or directly from different hospital departments were selected...
June 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28704940/effects-of-protein-iron-complex-concentrate-supplementation-on-iron-metabolism-oxidative-and-immune-status-in-preweaning-calves
#19
Robert Kupczyński, Michał Bednarski, Kinga Śpitalniak, Krystyna Pogoda-Sewerniak
The objective of this study was to determine the effects of feeding protein-iron complex (PIC) on productive performance and indicators of iron metabolism, hematology parameters, antioxidant and immune status during first 35 days of a calf's life. Preparation of the complex involved enzymatic hydrolysis of milk casein (serine protease from Yarrowia lipolytica yeast). Iron chloride was then added to the hydrolyzate and lyophilizate. Calves were divided into treated groups: LFe (low iron dose) 10 g/day calf of protein-iron complex, HFe (height iron dose) 20 g/day calf, and control group...
July 12, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28704722/arsanilic-acid-modified-superparamagnetic-iron-oxide-nanoparticles-for-purification-of-alkaline-phosphatase-from-hen-s-egg-yolk
#20
Hamed Farzi-Khajeh, Kazem D Safa, Siavoush Dastmalchi
Recent studies of magnetic carrier technology have focused on its applications in separation and purification technologies, due to easy separation of the target from the reaction medium by applying an external magnetic field. In the present study, Fe3O4 superparamagnetic nanoparticles were prepared to utilize a chemical co-precipitation method, then the surfaces of the nanoparticles were modified with arsanilic acid derivatives which were used as the specific nanocarriers for the affinity purification of alkaline phosphatase from the hen's egg yolk...
June 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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