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https://www.readbyqxmd.com/read/28548499/polyoxovanadate-alkoxide-clusters-as-a-redox-reservoir-for-iron
#1
Feng Li, Stephanie H Carpenter, Robert F Higgins, Mark G Hitt, William W Brennessel, Maryline G Ferrier, Samantha K Cary, Juan S Lezama-Pacheco, Joshua T Wright, Benjamin W Stein, Matthew P Shores, Michael L Neidig, Stosh A Kozimor, Ellen M Matson
Inspired by the multielectron redox chemistry achieved using conventional organic-based redox-active ligands, we have characterized a series of iron-functionalized polyoxovanadate-alkoxide clusters in which the metal oxide scaffold functions as a three-dimensional, electron-deficient metalloligand. Four heterometallic clusters were prepared through sequential reduction, demonstrating that the metal oxide scaffold is capable of storing up to four electrons. These reduced products were characterized by cyclic voltammetry, IR, electronic absorption, and (1)H NMR spectroscopies...
May 26, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537561/prediction-of-acute-pancreatitis-in-the-earliest-stages-role-of-biochemical-parameters-and-histopathological-changes
#2
Jacek Baj, Elżbieta Radzikowska, Marcin Maciejewski, Andrzej Dąbrowski, Kamil Torres
For many years, there has been a search for a set of biochemical parameters that could facilitate the assessment of severity, prognosis, and administration of early and appropriate treatment in acute pancreatitis. Administration of treatment within the first 48 hours since admission is associated with many problems of distinguishing patients with a mild form of acute pancreatitis (AP) from those with a severe form of acute pancreatitis. STUDY AIM: To assess the relationship between the extent of change in the concentration of 10 selected biochemical indicators: amylase, lipase, total bilirubin, creatinine, uric acid, aspartate transaminase, alanine transaminase, glucose, magnesium, and iron and histopathological lesions in the pancreas within 2 and 6 hours since induction of AP...
April 30, 2017: Polski Przeglad Chirurgiczny
https://www.readbyqxmd.com/read/28536020/%C3%B0-valuation-of-biocompatibility-and-antioxidant-efficiency-of-chitosan-alginate-nanoparticles-loaded-with-quercetin
#3
Denitsa Aluani, Virginia Tzankova, Magdalena Kondeva-Burdina, Yordan Yordanov, Elena Nikolova, Feodor Odzhakov, Alexandar Apostolov, Tzvetanka Markova, Krassimira Yoncheva
The present study deals with development and evaluation of the safety profile of chitosan/alginate nanoparticles as a platform for delivery of a natural antioxidant quercetin. The nanoparticles were prepared by varying the ratios between both biopolymers giving different size and charge of the formulations. The biocompatibility was explored in vitro in cells from different origin: cultivated HepG2 cells, isolated primary rat hepatocytes, isolated murine spleen lymphocytes and macrophages. In vivo toxicological evaluation was performed after repeated 14-day oral administration to rats...
May 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28534410/a-facile-methodology-for-the-development-of-printable-and-flexible-all-solid-state-rechargeable-battery
#4
Bibekananda De, Amit Yadav, Salman Khan, Kamal K Kar
Development of the printable and flexible energy storage device is one of the most promising technologies for wearable electronics in textile industry. The present work design a printable and flexible all solid state rechargeable battery for wearable electronic in textile application. Copper coated carbon fiber is used to make polyethylene oxide (PEO) based polymer nanocomposite for flexible and conductive current collector layer. Lithium iron phosphate (LiFePO4) and titanium dioxide (TiO2) are utilized to prepare cathode and anode layer, respectively with PEO and carbon black composites...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28532109/lactoferrin-modified-graphene-oxide-iron-oxide-nanocomposite-for-glioma-targeted-drug-delivery
#5
Meng-Meng Song, Huai-Liang Xu, Jun-Xing Liang, Hui-Hui Xiang, Rui Liu, Yu-Xian Shen
Targeting delivery of drugs in a specific manner represents a potential powerful technology in gliomas. Herein, we prepared a multifunctional targeted delivery system based on graphene oxide (GO) that contains a molecular bio-targeting ligand and superparamagnetic iron oxide nanoparticles on the surface of GO for magnetic targeting. Superparamagnetic Fe3O4 nanoparticles was loaded on the surface of GO via chemical precipitation method to form GO@Fe3O4 nanocomposites. Lactoferrin (Lf), an iron-transporting serum glycoprotein that binds to receptors overexpressed at the surface of glioma cells and vascular endothelial cell of the blood brain barrier, was chosen as the targeted ligand to construct the targeted delivery system Lf@GO@Fe3O4 through EDC/NHS chemistry...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530794/intrinsically-stretchable-electrochromic-display-by-a-composite-film-of-poly-3-4-ethylenedioxythiophene-and-polyurethane
#6
Hiroyuki Kai, Wataru Suda, Yudai Ogawa, Kuniaki Nagamine, Matsuhiko Nishizawa
A stretchable, electrochromic film of a uniform composite of poly(3,4-ethylenedioxythiophene):p-toluene sulfonic acid (PEDOT:PTS) and polyurethane (PU) (PEDOT/PU) was fabricated, and its integration with a hydrogel as a free-standing, stretchable electrochromic (EC) display was demonstrated. The PEDOT/PU composite film was prepared by the spin coating of a solution containing an EDOT monomer and PU, followed by oxidative polymerization using iron(III) tosylate at elevated temperature. The fabricated film showed reversible electrochromism without an external conductive support...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28529107/is-there-a-role-for-preoperative-iron-supplementation-in-patients-preparing-for-a-total-hip-or-total-knee-arthroplasty
#7
Stephen M Petis, Brent A Lanting, Edward M Vasarhelyi, Douglas D R Naudie, Fiona E Ralley, James L Howard
BACKGROUND: Several treatment modalities exist for the treatment of perioperative anemia. We determined the effect of oral iron supplementation on preoperative anemia, and the use of blood-conserving interventions before total hip arthroplasty (THA) and total knee arthroplasty (TKA). METHODS: A total of 3435 total joint arthroplasties (1461 THAs and 1974 TKAs) were analyzed during 2 phases of a blood conservation program. The first phase used erythropoietin alfa (EPO) or intravenous (IV) iron for patients at risk for perioperative anemia...
April 27, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28525809/one-step-preparation-of-nanostructured-martite-catalyst-and-graphite-electrode-by-glow-discharge-plasma-for-heterogeneous-electro-fenton-like-process
#8
Alireza Khataee, Saeed Sajjadi, Aliyeh Hasanzadeh, Behrouz Vahid, Sang Woo Joo
Natural Martite ore particles and graphite were modified by alternating current (AC) glow discharge plasma to form nanostructured catalyst and cathode electrode for using in the heterogeneous-electro Fenton-like (Het-EF-like) process. The performance of the plasma-treated martite (PTM) and graphite electrode (PTGE) was studied for the treatment of paraquat herbicide in a batch system. 85.78% degradation efficiency for 20 mg L(-1) paraquat was achieved in the modified process under desired operational conditions (i...
May 16, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28522005/biocompatible-microcrystalline-cellulose-particles-from-cotton-wool-and-magnetization-via-a-simple-in-situ-co-precipitation-method
#9
Mehnaz Rashid, Mohammad Abdul Gafur, Mostafa Kaiyum Sharafat, Hideto Minami, Mohd Abdul Jalil Miah, Hasan Ahmad
This investigation describes the preparation of magnetically doped degradable microcrystalline cellulose (MCC) nanocomposite particles with application potential in biotechnology, solid support for biomolecule/water purification, oil recovery from water and beyond. MCC was first extracted from cotton wool, the most abundant biocompatible polymer, by sulfuric acid hydrolysis and the effect of acid strength was examined. The size of the elongated fiber structure was reduced with increasing acid strength. MCC particles extracted by treatment with 70% sulfuric acid were used to prepare magnetic MCC nanocomposite particles...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28521977/alginate-coated-chitosan-core-shell-nanoparticles-for-efficient-oral-delivery-of-naringenin-in-diabetic-animals-an-in-vitro-and-in-vivo-approach
#10
Subhajit Maity, Piyasi Mukhopadhyay, Patit Paban Kundu, Abhay Sankar Chakraborti
The chemical synthesis of this study targets for development of a bio-safe polymeric nano-vehicle for improvising the solubility of the flavanone naringenin in antidiabetic animal study. Nanoparticles were prepared from two cost-effective carbohydrate biopolymers - chitosan and alginate for successful encapsulation of naringenin. Dual crosslinked nanoparticles were synthesized by using Na2SO4 and CaCl2 as crosslinkers. The nanoparticles were characterized by DLS, FTIR, XRD and SEM. The prepared nano-formulations exhibited significant naringenin entrapment of >90% and pH-responsive slow and sustained release of the flavonoid...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28520398/multiple-states-of-nitrile-hydratase-from-rhodococcus-equi-tg328-2-structural-and-mechanistic-insights-from-epr-and-dft-studies
#11
Natalia Stein, Natalie Gumataotao, Natalia Hajnas, Rui Wu, K P Wasantha Lankathilaka, Uwe T Bornscheuer, Dali Liu, Adam T Fiedler, Richard C Holz, Brian Bennett
Iron-type nitrile hydratases (NHases) contain an Fe(III) ion coordinated in a characteristic "claw setting" by an axial cysteine thiolate; two equatorial peptide nitrogens; the sulfur atoms of equatorial cysteine-sulfenic and cysteine-sulfinic acids, respectively; and an axial water/hydroxyl moiety. The cysteine-sulfenic acid is susceptible to oxidation and the enzyme is traditionally prepared using butyric acid as an oxidative protectant. The as-prepared enzyme exhibits a complex EPR spectrum due to multiple low-spin (S = 1/2) Fe(III) species...
May 18, 2017: Biochemistry
https://www.readbyqxmd.com/read/28517006/synthesis-and-characterization-of-a-family-of-thioether-dithiolate-bridged-heteronuclear-iron-complexes
#12
Yahui Zhang, Dawei Yang, Ying Li, Baomin Wang, Xiangyu Zhao, Jingping Qu
The thioether-dithiolate-bridged heterotrinuclear complexes [Cp*Fe(μ-1k(3)SSS':2k(2)SS-tpdt)M(μ-2k(2)SS:3k(3)SSS'-tpdt)FeCp*][PF6]2 (Cp* = η(5)-C5Me5; tpdt = S(CH2CH2S)2; 2, M = Co; 3, M = Ni; 4, M = Pd) have been prepared by a reaction of [Cp*Fe(η(3)-tpdt)] (1) with complexes CoCl2, NiCl2(PPh3)2, and PdCl2(PPh3)2, respectively. Similarly, treatment of complex 1 with CuCl(PPh3) or AgPF6 afforded two heterotrinuclear complexes, [Cp*Fe(μ-1k(3)SSS':2k(2)SS-tpdt)M(μ-2k(2)SS:3k(3)SSS'-tpdt)FeCp*][PF6] (5, M = Cu; 6, M = Ag), while reaction of 1 with the complex AuCl(PPh3) gave a heterobinuclear complex, [Cp*Fe(μ-1k(3)SSS':2k(1)S-tpdt)Au(PPh3)][PF6] (7)...
May 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28516182/intracellular-accumulation-and-immunological-responses-of-lipid-modified-magnetic-iron-nanoparticles-in-mouse-antigen-processing-cells
#13
Chenmeng Qiao, Jun Yang, Lei Chen, Jie Weng, Xin Zhang
Understanding the effects of magnetic iron nanoparticles (MINPs) on the immune response is vitally important for biomedical applications such as cancer therapy, disease diagnosis and novel cancer imaging. In this study, lipid modified MINPs were designed and prepared by introducing the neutral lipid DSPE-PEG or the zwitterionic lipid DSPE-PCB into hydrophobic MINPs through hydrophobic interaction (L-MINPs and ZL-MINPs, respectively). The effect of L-MINPs and ZL-MINPs on the intracellular accumulation and immune responses of three kinds of antigen processing cells was examined...
May 18, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28514836/oxidation-of-organic-contaminant-in-a-self-driven-electro-natural-maghemite-peroxydisulfate-system-efficiency-and-mechanism
#14
Suding Yan, Weihui Xiong, Shuya Xing, Yueqi Shao, Rui Guo, Hui Zhang
Electro-assisted iron-mediated persulfate (PS) activation process has been successfully employed to oxidize organic contaminant. However, a majority of iron-based catalysts used for PS activation was synthesized through complicated or demanding procedures and may have potential risks on environment during the preparation process. Herein, natural maghemite (NM) which is abundant on the earth was employed to activate peroxydisulfate (PDS) in an electrolytic cell. The voltage was provided by microbial fuel cell (MFC) instead of external power as reported in the previous studies, so as to establish a self-driven electro/natural maghemite/PDS system (MFC/NM/PDS) for the oxidation of acid orange 7 (AO7)...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28514699/profiling-of-illicit-cocaine-seized-in-china-by-icp-ms-analysis-of-inorganic-elements
#15
Cuimei Liu, Zhendong Hua, Xin Meng
For the first time in China, the inorganic element profiling of cocaine specimens was performed at the National Narcotics Laboratory. An inductive coupled plasma-mass spectrometry (ICP-MS) method was developed and validated for simultaneous analysis of 26 inorganic elements, including sodium (Na), magnesium (Mg), aluminuim (Al), potassium (K), calcium (Ca), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), arsenic (As), selenium (Se), molybdenum (Mo), silver (Ag), cadmium (Cd), antimony (Sb), barium (Ba), lanthanum (La), cerium (Ce), thallium (Tl), lead (Pb), thorium (Th), and uranium (U) in illicit cocaine samples...
April 29, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28513808/magnetic-nanoparticle-enhanced-pcr-for-the-detection-and-identification-of-staphylococcus-aureus-and-salmonella-enteritidis
#16
Dimitra Houhoula, Joseph Papaparaskevas, Katerina Zatsou, Nikolaos Nikolaras, Hanan I Malkawi, Marie-Paule Mingenot-Leclercq, Spyros Konteles, Stamatis Koussisis, Athanassios Tsakris, Ekatherina Charvalos
This paper evaluated magnetic nanoparticle-enhanced PCR for the detection and identification of Staphylococcus aureus and Salmonella enteritidis. Two different types of magnetic nanoparticles designated MPIO (iron concentration 2.5 mg/ml, size 1 μm) and NP (iron concentration 8.7 mg/ml, size 60 nm), both conjugated with S. aureus or S. enteritidis antibodies were evaluated as an enrichment procedure for PCR-detection of the pathogens in Trypticase Soy Broth, milk, blood and meat broth. Bacterial suspensions (1...
May 17, 2017: New Microbiologica
https://www.readbyqxmd.com/read/28513139/one-step-facile-synthesis-of-highly-magnetic-and-surface-functionalized-iron-oxide-nanorods-for-biomarker-targeted-applications
#17
Anamaria Ioana Orza, Hui Wu, Yaolin Xu, Qiong Lu, Hui Mao
We report a one-step method for facile and sustainable synthesis of magnetic iron oxide nanorods (or IONRs) with the mean lengths ranging from 25 to 50 nm and mean diameters ranging from 5 to 8 nm. The prepared IONRs are highly stable in aqueous media and can be surface functionalized for biomarker targeted applications. This synthetic strategy involves the reaction of iron(III) acetylacetonate with polyethyleneimine in the presence of oleylamine and phenylether, followed by thermal decomposition. Importantly, the length and diameter as well as the aspect ratio of prepared IONRs can be controlled by modulating the reaction parameters...
May 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28513137/hierarchical-porous-carbon-doped-with-iron-nitrogen-sulfur-for-efficient-oxygen-reduction-reaction
#18
Issa Kone, Ao Xie, Yang Tang, Yu Chen, Jia Liu, Yongmei Chen, Yanzhi Sun, Xiao Jin Yang, Pingyu Wan
Hierarchical porous Fe/N/S-doped carbon with dominance of graphitic nitrogen (FeNS/HPC) has been successfully synthesized by a facile dual-template method. FeNS/HPC shows not only macro-pores resulting from the dissolution of SiO2 template, but also abundant meso-pores were obtained after removing of the in-situ generated Fe2O3 nanoparticles on the ultra-thin (~4 nm) carbon shell of macro-pores. Moreover, micro-pores are produced during the thermal pyrolysis of carbon precursors. With respect to electrochemical performance towards oxygen reduction reaction (ORR), FeNS/HPC not only exceeds other prepared porous carbon materials completely, but also shows higher onset potential (0...
May 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28510533/coordination-polymer-nanocapsules-prepared-using-metal-organic-framework-templates-for-ph-responsive-drug-delivery
#19
Tang Lei, Jiafu Shi, Xiaoli Wang, Shaohua Zhang, Hong Wu, Hongfan Sun, Zhongyi Jiang
A facile, efficient and versatile approach is presented to synthesize pH-responsive nanocapsules (~120 nm) by combining the advantages of metal-organic frameworks (MOFs) and metal-organic thin films. The ZIF-8 nanoparticles are used as templates on which a thin film coating of Iron(III)-catechol complexes is derived from the coordination between dopamine-modified alginate (AlgDA) and Iron(III) ions. After the templates removal, nanocapsules with a pH-responsive wall are obtained. Doxorubicin (Dox), a typical anticancer drug, is first immobilized in ZIF-8 frameworks through coprecipitation and then encapsulated in nanocapsules after the removal of ZIF-8...
May 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28509551/significance-of-the-2fe-2s-cluster-n1a-for-electron-transfer-and-assembly-of-escherichia-coli-respiratory-complex-i
#20
Katerina Dörner, Marta Vranas, Johannes Schimpf, Isabella R Straub, Jo Hoeser, Thorsten Friedrich
NADH:ubiquinone oxidoreductase, respiratory complex I, couples electron transfer from NADH to ubiquinone with proton translocation across the membrane. NADH reduces a non-covalently bound FMN and the electrons are transported further to the quinone reduction site by a 95 Å long chain of seven iron-sulfur (Fe-S) clusters. The binuclear Fe-S cluster N1a is not part of this long chain but is located in electron transfer distance on the opposite site of FMN. The relevance of N1a to the mechanism of complex I is not known...
May 16, 2017: Biochemistry
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