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iron preparation

Kai-Long Zhang, Jie Zhou, Hong Zhou, Ying Wu, Rui Liu, Li-Li Wang, Wei-Wen Lin, Guoming Huang, Huang-Hao Yang
The mononuclear phagocyte system (MPS), with key roles in recognition and clearance of foreign particles, is a major constraint to nanoparticle-based delivery systems. The desire to improve the delivery efficiency has prompted the search for stealthy long-circulating nanoplatforms. Herein, we design an antiphagocytic delivery system with "active" stealth behavior for cancer theranostics combining efficient MRI and enhanced drug delivery. We modify self-peptide, a synthetic peptide for active immunomodulation, to biodegradable poly (lactide-glycolide)-poly (ethylene glycol) (PLGA-PEG), then utilize the self-assembly properties of PLGA-PEG to form nanomicelles that encapsulating iron oxide (IO) nanoparticles and anticancer drug paclitaxel (PTX)...
August 16, 2017: ACS Applied Materials & Interfaces
Peng Wang, Michelle M Killian, Mohamed R Saber, Tian Qiu, Glenn P A Yap, Codrina V Popescu, Joel Rosenthal, Kim R Dunbar, Thomas C Brunold, Charles G Riordan
The iron(II) semiquinonate character within the iron(III) catecholate species has been proposed by numerous studies to account for the O2 reactivity of intradiol catechol dioxygenases, but a well-characterized iron(II) semiquinonate species that exhibits intradiol cleaving reactivity has not yet been reported. In this study, a detailed electronic structure description of the first iron(II) o-semiquinonate complex, [PhTt(tBu)]Fe(phenSQ) [PhTt(tBu) = phenyltris(tert-butylthiomethyl)borate; phenSQ = 9,10-phenanthrenesemiquinonate; Wang et al...
August 15, 2017: Inorganic Chemistry
Alessandro Buccolieri, Antonio Serra, Giuseppe Maruccio, Anna Grazia Monteduro, Sanosh Kunjalukkal Padmanabhan, Antonio Licciulli, Valentina Bonfrate, Luca Salvatore, Daniela Manno, Lucio Calcagnile, Gabriele Giancane
Mixed iron-manganese oxide nanoparticles, synthesized by a simple procedure, were used to remove nickel ion from aqueous solutions. Nanostructures, prepared by using different weight percents of manganese, were characterized by transmission electron microscopy, selected area diffraction, X-ray diffraction, Raman spectroscopy, and vibrating sample magnetometry. Adsorption/desorption isotherm curves demonstrated that manganese inclusions enhance the specific surface area three times and the pores volume ten times...
2017: Journal of Analytical Methods in Chemistry
Natália S F Trotte, M Alzamora, D R Sánchez, Nakédia M F Carvalho
This study aims to prepare environmentally friendly iron catalysts supported on silica, using glycerol as green reducing and stabilizing agent, for application in heterogeneous Fenton degradation of the pollutant dye methyl orange. The catalysts were characterized by XRD, AAS, SEM, TEM, thermogravimetric analyses, Mössbauer and FTIR spectroscopies, which revealed the formation of iron(II)/(III) oxalates from the oxidation of glycerol by the iron(III) nitrate precursor. Besides, iron oxihydroxide nanoparticles with superparamagnetic behavior were also formed...
August 10, 2017: Environmental Technology
Meghan Callaghan-Gillespie, Andrew A Schaffner, Patsy Garcia, Jocelyn Fry, Rachael Eckert, Shirin Malek, Indi Trehan, Chrissie Thakwalakwa, Kenneth M Maleta, Mark J Manary, Peggy C Papathakis
Background: Malnutrition during pregnancy in sub-Saharan Africa is associated with poor birth outcomes.Objective: This study compared maternal and offspring anthropometry for moderately malnourished pregnant women receiving ready-to-use supplemental food (RUSF), a fortified corn-soy blend (CSB+) with a daily multiple micronutrient antenatal supplement [United Nations International Multiple Micronutrient Preparation (UNIMMAP)], or standard of care comprising CSB+ and iron and folic acid (IFA).Design: A single-blind randomized controlled clinical trial was conducted in southern Malawi among 1828 pregnant women with moderate malnutrition, defined as a midupper arm circumference (MUAC) ≥20...
August 9, 2017: American Journal of Clinical Nutrition
Jafar Mosafer, Manouchehr Teymouri
Poly (lactic-co-glycolic acid) (PLGA) is a widely used biodegradable polymer for preparation of polymeric biodegradable carriers that shows attractive features and offers possibilities to tune the physicochemical characteristics, drug release properties and biological behaviour of the PLGA-based nanospheres. Double emulsion solvent evaporation methods fail when it comes to encapsulation of highly hydrophilic drugs such as doxorubicin (Dox). The reason for this defect is due to the rapid drug diffusion into the external aqueous phase before solidification of the PLGA nanospheres...
August 9, 2017: Artificial Cells, Nanomedicine, and Biotechnology
Edward J Vinski
Although William James never again reprised his lectures on psychology for teachers at Harvard, he spent most of the 1890s presenting them throughout the country. For all his complaints about them, this was a fine source of income and he used the opportunity to revise and refine them over the rest of the decade. By the end of the 1890s, he was prepared to put the talks down in book form, and turned to his long-time publisher, Henry Holt. The two men first became acquainted with each other when James agreed to write a volume for Holt's American Science series...
August 2017: History of Psychology
Robert M Glaeser, Bong-Gyoon Han
Samples prepared for single-particle electron cryo-microscopy (cryo-EM) necessarily have a very high surface-to-volume ratio during the short period of time between thinning and vitrification. During this time, there is an obvious risk that macromolecules of interest may adsorb to the air-water interface with a preferred orientation, or that they may even become partially or fully unfolded at the interface. In addition, adsorption of macromolecules to an air-water interface may occur even before thinning. This paper addresses the question whether currently used methods of sample preparation might be improved if one could avoid such interfacial interactions...
2017: Biophysics Reports
Mingyi Fan, Tongjun Li, Jiwei Hu, Rensheng Cao, Qing Wu, Xionghui Wei, Lingyun Li, Xuedan Shi, Wenqian Ruan
Reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites were prepared by chemical deposition method and were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, N₂-sorption and X-ray photoelectron spectroscopy (XPS). Operating parameters for the removal process of Pb(II) ions, such as temperature (20-40 °C), pH (3-5), initial concentration (400-600 mg/L) and contact time (20-60 min), were optimized using a quadratic model. The coefficient of determination (R² > 0...
August 12, 2016: Materials
Wensheng Li, Lingtao Sun, Rong Hu, Wenli Liao, Zhongbin Li, Yanrong Li, Chaozhong Guo
The great challenge of boosting the oxygen reduction reaction (ORR) activity of non-noble-metal electrocatalysts is how to achieve effective exposure and full utilization of nitrogen-rich active sites. To realize the goals of high utilization of active sites and fast electron transport, here we report a new strategy for synthesis of an iron and nitrogen co-doped carbon nanolayers-wrapped multi-walled carbon nanotubes as ORR electrocatalyst (N-C@CNT-Fe) via using partially carbonized hemoglobin as a single-source precursor...
May 20, 2017: Materials
Mingyi Fan, Tongjun Li, Jiwei Hu, Rensheng Cao, Xionghui Wei, Xuedan Shi, Wenqian Ruan
Reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites were synthesized in the present study by chemical deposition method and were then characterized by various methods, such as Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The nZVI/rGO composites prepared were utilized for Cd(II) removal from aqueous solutions in batch mode at different initial Cd(II) concentrations, initial pH values, contact times, and operating temperatures. Response surface methodology (RSM) and artificial neural network hybridized with genetic algorithm (ANN-GA) were used for modeling the removal efficiency of Cd(II) and optimizing the four removal process variables...
May 17, 2017: Materials
Davit Jishkariani, Yaoting Wu, Da Wang, Yang Liu, Alfons van Blaaderen, Christopher B Murray
Janus nanoparticles (NPs) often referred to as nanosized analogs of molecular surfactants are amphiphilic structures with potential applications in materials science, biomedicine, and catalysis, and their synthesis and self-assembly into complex architectures remain challenging. Here, we demonstrate the preparation of Janus heterodimers via asymmetric functionalization of Fe3O4-Pt and Fe3O4-Au heterodimeric NPs. The hydrophobic and hydrophilic dendritic ligands that carry phosphonic acid and disulfide surface binding groups selectively coat the iron oxide and platinum (or gold) parts of the heterodimer, respectively...
August 11, 2017: ACS Nano
Changyou Shao, Huanliang Chang, Meng Wang, Feng Xu, Jun Yang
Dynamic noncovalent interactions with reversible nature are critical for the integral synthesis of self-healing biological materials. In this work, we developed a simple one-pot strategy to prepare a fully physically cross-linked nanocomposite hydrogel through the formation of the hydrogen bonds and dual metal-carboxylate coordination bonds within supramolecular networks, in which iron ions (Fe(3+)) and TEMPO oxidized cellulose nanofibrils (CNFs) acted as cross-linkers and led to the improved mechanical strength, toughness, time-dependent self-recovery capability and self-healing property...
August 16, 2017: ACS Applied Materials & Interfaces
Yu-Hin Ho, Sheng-Yang Ho, Cheng-Chih Hsu, Jiun-Jie Shie, Tsung-Shing Andrew Wang
A direct and selective method for the functionalization of aerobactin has been described. Selectivity was achieved by masking the functioning carboxylate via iron-chelation, leaving the two remaining carboxylates for direct modification. Both mono- and bis-functionalized aerobactin effectively targeted pathogenic bacteria, showing a facile method with prospective applications.
August 3, 2017: Chemical Communications: Chem Comm
Margarida Borrell, Miquel Costas
Product release is the rate determining step in the arene syn-dihydroxylation reaction taking place at Rieske oxygenase enzymes, and is regarded as a difficult prob-lem to be resolved in the design of iron catalysts for olefin syn-dihydroxylation with potential utility in or-ganic synthesis. Towards this end, in this work a novel catalyst bearing a sterically encumbered tetradentate ligand based in the tpa (tpa = tris-(2-methylpyridyl)amine scaffold, [FeII(CF3SO3)2(5-tips3tpa)], 1 has been designed. The steric demand of the ligand was envisioned as a key element to support a high cata-lytic activity by isolating the metal center, preventing bimolecular decomposition paths, and facilitating prod-uct release...
August 2, 2017: Journal of the American Chemical Society
Yahui Cai, Shun Yang, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu
A novel strategy was used to immobilize bacterial cells on the surface of functional polymer particles for the efficient adsorption and biodegradation of organics in wastewater. First, the bacterial cells were aggregated using a vinyl-containing pre-polymer, and the obtained bacteria-pre-polymer complex was then used as a particle stabilizer to construct a stable Pickering emulsion of functional cross-linking monomers and hydrophobic superparamagnetic iron oxide nanoparticles (the oil phase) in water. After polymerization, the bacteria-pre-polymer complex was covalently fixed to the surface of the polymer particles...
August 2, 2017: Nanoscale
Seyyed Muhammad Salili, Matthew Worden, Ahlam Nemati, Donald W Miller, Torsten Hegmann
A room temperature reduction-hydrolysis of Fe(III) precursors such as FeCl₃ or Fe(acac)₃ in various lyotropic liquid crystal phases (lamellar, hexagonal columnar, or micellar) formed by a range of ionic or neutral surfactants in H₂O is shown to be an effective and mild approach for the preparation of iron oxide (IO) nanomaterials with several morphologies (shapes and dimensions), such as extended thin nanosheets with lateral dimensions of several hundred nanometers as well as smaller nanoflakes and nanodiscs in the tens of nanometers size regime...
August 2, 2017: Nanomaterials
Jungwon Park, Hyunjoon Lee, Young Eun Bae, Kyoung Chul Park, Hoon Ji, Nak Cheon Jeong, Min Hyung Lee, Oh Joong Kwon, Chang Yeon Lee
Active, stable electrocatalysts based on non-precious metals for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) are critical for the development of cost-effective, efficient renewable energy technologies. Here, Fe/Fe3C-embedded nitrogen-doped carbon was fabricated via pyrolysis of iron-porphyrin-encapsulated mesoporous metal-organic frameworks [PCN-333 (Fe), where "PCN" stands for "porous coordination network"] at 700 °C. The various characterization techniques confirmed that Fe- and Fe3C-containing Fe-N-C material (FeP-P333-700) was successfully prepared by pyrolysis of porphyrin-encapsulated PCN-333 (Fe)...
August 15, 2017: ACS Applied Materials & Interfaces
Bin Xie, Hang Luo, Qing Tang, Jun Du, Zuohua Liu, Changyuan Tao
Black rock series (BRS) is of great potential for their plenty of valued oxides which include vanadium, iron, alumina and silica oxides, etc. BRS was used for directly preparing of selective catalytic reduction (SCR) catalyst by modifying its surface texture with SiO2-TiO2 sols and regulating its catalytic active constituents with V2O5 and MoO3. Consequently, 90% NO removal ratio was obtained within 300-400 °C over the BRS-based catalyst. The structure and properties of the BRS-based catalyst were characterized by the techniques of N2 adsorption-desorption, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), H2-temperature programmed reduction (H2-TPR), and NH3-temperature programmed desorption (NH3-TPD)...
August 1, 2017: Environmental Science and Pollution Research International
A Poscia, J Stojanovic, F Kheiraoui, E M Proli, F Scaldaferri, M Volpe, M L Di Pietro, A Gasbarrini, L Fabrizio, S Boccia, C Favaretti
Iron deficiency anaemia (IDA) is the main extraintestinal manifestation affecting patients with inflammatory bowel disease (IBD). The Health Technology Assessment approach was applied to evaluate the sustainability of intravenous (IV) iron formulations in the Italian hospital setting, with particular focus on ferric carboxymaltose. Data on the epidemiology of IBD and associated IDA, in addition to the efficacy and safety of IV iron formulations currently used in Italy, were retrieved from scientific literature...
2017: BioMed Research International
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