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Manganese oxide

Lili Feng, Rui Xie, Chuanqing Wang, Shili Gai, Fei He, Dan Yang, Piaoping Yang, Jun Lin
Therapeutic nanosystems which can be triggered by the distinctive tumor microenvironment possess great selectivity and safety to treat cancers via in situ transformation of nontoxic prodrugs into toxic therapeutic agents. Here, we constructed an intelligent, magnetic targeting and tumor microenvironment responsive nanocatalysts that can acquire oxidation therapy of cancer via specific reaction at tumor site. The magnetic nanoparticle core of iron carbide-glucose oxidase (Fe5C2-GOD) achieved by physical absorption has a high enzyme payload and the manganese dioxide (MnO2) nanoshell as an intelligent "gatekeeper" shields GOD from premature leaking until reaching tumor tissue...
October 19, 2018: ACS Nano
Sangyong Lim, Jong-Hyun Jung, Laurence Blanchard, Arjan de Groot
Deinococcus bacteria are famous for their extreme resistance to ionizing radiation and other DNA damage- and oxidative stress-generating agents. More than a hundred genes have been reported to contribute to resistance to radiation, desiccation and/or oxidative stress in Deinococcus radiodurans. These encode proteins involved in DNA repair, oxidative stress defence, regulation, and proteins of yet unknown function or with an extracytoplasmic location. Here, we analysed the conservation of radiation resistance-associated proteins in other radiation-resistant Deinococcus species...
October 18, 2018: FEMS Microbiology Reviews
Maria Rosa Chitolina Schetinger, Tanara V Peres, Letícia P Arantes, Fabiano Carvalho, Valderi Dressler, Graciela Heidrich, Aaron B Bowman, Michael Aschner
Humans are exposed simultaneously to a variety of neurotoxic agents, including manganese (Mn) and methylmercury (MeHg). Therefore, the study of combined exposures to toxicants is timely. This work aimed to study changes in cholinergic system focusing on acetylcholinesterase (ace-2), monoaminergic system focusing on vesicular monoamine transporter (VMAT, cat-1) expression, to address changes in antioxidant enzymatic systems, namely, the expression of superoxide dismutase (sod-3 and sod-4) and catalase (ctl-3), as well as worm reproduction and locomotion...
October 15, 2018: Toxicology
Toru Hatsukade, Alexander Schiele, Pascal Hartmann, Torsten Brezesinski, Jürgen Janek
Gas formation caused by parasitic side reactions is one of the fundamental concerns in state-of-the-art lithium-ion batteries, since gas bubbles might block local parts of the electrode surface, hindering lithium transport and leading to inhomogeneous current distributions. Here, we elucidate on the origin of CO2 , which is the dominant gaseous species associated with the layered lithium nickel cobalt manganese oxide (NCM) cathode, by implementing isotope labeling and electrolyte substitution in differential electrochemical mass spectrometry-differential electrochemical infrared spectroscopy (DEMS-DEIRS) measurements...
October 18, 2018: ACS Applied Materials & Interfaces
Ayodeji O Falade, Leonard V Mabinya, Anthony I Okoh, Uchechukwu U Nwodo
Direct municipal wastewater effluent discharge from treatment plants has been identified as the major source of endocrine-disrupting chemicals (EDC) in freshwaters. Consequently, efficient elimination of EDC in wastewater is significant to good water quality. However, conventional wastewater treatment approaches have been deficient in the complete removal of these contaminants. Hence, the exploration of new and more efficient methods for elimination of EDC in wastewater is imperative. Enzymatic treatment approach has been suggested as a suitable option...
October 17, 2018: MicrobiologyOpen
Kousik Bhunia, Moumita Chandra, Debabrata Pradhan
This review focuses on the recent progress in shape-controlled synthesis and exposed facets-dependent catalytic properties of widely used nanostructured noble metals (Pd, Pt, and Au), bimetallic alloys involving one noble metal, and oxides of first row d-block elements such as titanium oxide (TiO₂), vanadium oxide (V₂O5 ), chromium oxide (Cr₂O₃), manganese oxide (MnO₂), iron oxide (Fe₂O₃), cobalt oxide (Co₃O₄), nickel oxide (NiO), copper oxide (Cu₂O), and zinc oxide (ZnO). The major emphasis is given on the role of shape-controlling agents and experimental parameters to control the exposed facets of the nanocrystals...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Peng Ye, Qiancheng Zou, Luyang An, Yi Wei, Aihua Xu, Xiaoxia Li
Due to low cost and low toxicity, manganese oxides have been extensively explored to reduce organic pollutants in wastewater via peroxymonosulfate (PMS) activation; but the development of manganese-based catalysts with facile synthesis process at low temperatures and high efficiency is still of significant practical interest. In this paper, a simple room temperature method has been successfully developed to synthesize cryptomelane-type manganese octahedral molecular sieves (OMS-2) from KMnO4 and MnSO4 in the presence of carbon nanotubes (CNTs)...
October 10, 2018: Journal of Colloid and Interface Science
Bo Sun, Zhongjin Xiao, Hongyu Dong, Shangchen Ma, Guangfeng Wei, Tongcheng Cao, Xiaohong Guan
Colloidal MnO2 is the most reactive phase of Mn(IV) while HSO3 - is a common reductant in water treatment. This study shows that the presence of HSO3 - resulted in significant increase in the decomposition rate of organic contaminants by colloidal MnO2 . The degradation rate of contaminants in the MnO2 /HSO3 - process dropped with elevating pH and a proper MnO2 /HSO3 - molar ratio was critical for efficient decomposition of contaminants. The time-resolved spectroscopy of manganese species, the influence of pyrophosphate on UV absorbance spectra, and the relative rate constants of contaminants oxidation in MnO2 /HSO3 - process suggested that the synergetic effect of HSO3 - and colloidal MnO2 arose from the generation of Mn(III)aq , which could oxidize contaminants rapidly...
October 2, 2018: Journal of Hazardous Materials
Claudio Saracini, Shunichi Fukuzumi, Yong-Min Lee, Wonwoo Nam
Recent advances on the excited state chemistry of metal-oxygen synthetic complexes based on earth-abundant metals such as copper, cobalt, and manganese are reviewed to show a much enhanced reactivity of the photoexcited states as compared with their relative ground states. Mononuclear copper(ii)-superoxide and dinuclear copper(ii)-peroxo complexes underwent copper-oxygen bond cleavage, dioxygen release, and copper(i)/dioxygen rebinding upon photoexcitation at low temperature. Photoirradiation of the cobalt-oxygen compound [(TAML)CoIV(O)]2- (6) (TAML = tetraamidomacrocyclic ligand) at 5 °C yielded a cobalt-oxygen excited state with 0...
October 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
T Yasui, R M Ehrhardt, G R Bowman, M Vázquez-Añon, J D Richards, C A Atwell, T R Overton
Trace minerals have important roles in immune function and oxidative metabolism; however, little is known about the relationships between supplementation level and source with outcomes in dairy cattle. Multiparous Holstein cows (n=48) beginning at 60 to 140 days in milk were utilized to determine the effects of trace mineral amount and source on aspects of oxidative metabolism and responses to intramammary lipopolysaccharide (LPS) challenge. Cows were fed a basal diet meeting National Research Council (NRC) requirements except for no added zinc (Zn), copper (Cu) or manganese (Mn)...
October 16, 2018: Animal: An International Journal of Animal Bioscience
J C J Gude, L C Rietveld, D van Halem
In the top layer of aerated rapid sand filtration systems, uncharged As(III) is biologically converted to charged As(V). Subsequently, the main removal mechanism for As(V) is adsorption onto oxidised, flocculated Fe(III) (hydrous ferric hydroxides; HFO). The aim of this research was to understand the interactions between As and Fe in biologically active rapid filter columns and investigate the effect of different operational modes on Fe removal to subsequently promote As removal. For this purpose, different filter media column experiments were performed using natural, aerated groundwater containing 3...
October 5, 2018: Water Research
Will Lynch, Genevieve Lynch, Kirk Sheriff, Clifford Padgett
Manganese(II) acetate coordination polymers have been prepared with three derivatives of pyridine N -oxide. The compounds are catena -poly[manganese(II)-μ3 -acetato-di-μ2 -acetato-[aqua-manganese(II)]-μ2 -acetato-μ-(pyridine N -oxide)-manganese(II)-μ3 -acetato-μ2 -acetato-μ-(pyridine N -oxide)-[aqua-manganese(II)]-di-μ2 -acetato], [Mn4 (CH3 COO)8 (C5 H5 NO)2 (H2 O)2 ] n , ( I ), catena -poly[[manganese(II)]-μ3 -acetato-μ2 -acetato-μ-(2-methyl-pyridine N -oxide)-[aqua-manganese(II)]-di-μ2 -acetato-manganese(II)-di-μ2 -acetato-μ3 -acetato-[aqua-manganese(II)]-μ2 -acetato-μ-(2-methyl-pyridine N -oxide)], [Mn4 (CH3 COO)8 (C6 H7 NO)2 (H2 O)2 ] n , ( II ), and catena -poly[[manganese(II)-di-μ2 -acetato-μ-(4-methyl-pyridine N -oxide)] monohydrate], {[Mn(CH3 COO)2 (C6 H7 NO)]·H2 O} n , ( III )...
October 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
R P Abdalla, B M S Kida, J P S Pinheiro, L F Oliveira, C B F Martinez, R G Moreira
Exposure to aluminum (Al) and aluminum + manganese (Mn) can trigger an increase in reactive oxygen species (ROS) and modify the activity of oxidative defense enzymes. This study investigated whether exposure to Al and Al + Mn at acid pH for 24 and 96 h causes oxidative stress evidenced by antioxidants and oxidative damage in the gills and liver of sexually mature Astyanax altiparanae males. The fish were subsequently immersed in metal-free water for 24 and 96 h to see whether they recovered from the effects of these metals...
October 11, 2018: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
Rania Ben Saad, Anis Ben Hsouna, Walid Saibi, Karim Ben Hamed, Faical Brini, Thaura Ghneim-Herrera
Agricultural soil pollution by heavy metals is a severe global ecological problem. We recently showed that overexpression of LmSAP, a member of the stress-associated protein (SAP) gene family isolated from Lobularia maritima, in transgenic tobacco led to enhanced tolerance to abiotic stress. In this study, we characterised the response of LmSAP transgenic tobacco plants to metal stresses (cadmium (Cd), copper (Cu), manganese (Mn), and zinc (Zn)). In L. maritima, LmSAP expression increased after 12 h of treatment with these metals, suggesting its involvement in the plant response to heavy metal stress...
September 29, 2018: Journal of Plant Physiology
Natalia María Bulacio Gil, Hipólito Fernando Pajot, María Del Milagro Rosales Soro, Lucía Inés Castellanos de Figueroa, Daniel Kurth
Trichosporon akiyoshidainum HP-2023 completely discolorised Reactive Black 5 (200 mg/l) in 24 h. Manganese peroxidase and phenoloxidase, but no laccase activities were detected throughout the incubation. Total aromatic amines in media with Reactive Black 5 decreased 83% after 24 h, supporting an oxidative mechanism of azo dye discoloration. To unravel the genetic basis of these activities, the genome of Trichosporon akiyoshidainum HP-2023 was sequenced, assembled and annotated de novo. T. akiyoshidainum HP-2023 genome comprises 30 MB with a G+C content of 60...
October 2018: 3 Biotech
Abani Kumar Patar, Anupama Sharma, Donkupar Syiem, Surya Bhan
Chlorophyllin is a water-soluble mixture of sodium-copper salts of chlorophyll with antioxidant and antimutagen properties. In this study, an attempt has been made to evaluate the effect of chlorophyllin on hyperglycemia-induced oxidative stress and apoptosis in liver of streptozotocin (STZ)-administered mice. In STZ-induced diabetes, two causative factors for pancreatic β-cell deaths are DNA alkylation and profound reactive oxygen species (ROS) generation. In this study, chlorophyllin treatment was found to be able to modulate oxidative stress and apoptosis in liver of diabetic mice...
October 10, 2018: BioFactors
Elisa Vignali, Fabio Tonin, Loredano Pollegioni, Elena Rosini
Peroxidases are well-known biocatalysts produced by all organisms, especially microorganisms, and used in a number of biotechnological applications. The enzyme DypB from the lignin-degrading bacterium Rhodococcus jostii was recently shown to degrade solvent-obtained fractions of a Kraft lignin. In order to promote the practical use, the N246A variant of DypB, named Rh_DypB, was overexpressed in E. coli using a designed synthetic gene: by employing optimized conditions, the enzyme was fully produced as folded holoenzyme, thus avoiding the need for a further time-consuming and expensive reconstitution step...
October 9, 2018: Applied Microbiology and Biotechnology
Zhiyu Jian, Yaohui Bai, Yangyang Chang, Jinsong Liang, Jiuhui Qu
Increasing micropollutant and cyanobacterial contamination of drinking water threatens human health worldwide. However, these contaminates are not efficiently removed by common drinking water treatment processes, and thus additional treatments are frequently required. Recent investigations have demonstrated that KMnO4 pre-oxidation can efficiently remove some micropollutants and cyanobacteria but the release of cyanobacterial toxins and Mn2+ limit its use. To overcome these problems, we proposed a KMnO4 pre-oxidation coupled with bioaugmentation (e...
October 4, 2018: Chemosphere
Yutian Tian, Shuhan Guo, Cengceng Chen, Li Zhao, Zhen Li, Yongjian Yan
Manganese poisoning is a common occupational disease, studies have found that the susceptibility to manganese poisoning differs in individuals. We adopted genome-wide sequencing methods to screen for susceptibility genes involved in gene-mediated metabolic pathways from the perspective of manganese poisoning. We identified 18,439 genes in this study, including 14,272 known genes and 4398 new genes. We then selected 17 differential genes using p values, of which 7 genes were down-regulated and 10 genes were up-regulated...
September 29, 2018: Environmental Toxicology and Pharmacology
Victoria F Oswald, Andrew C Weitz, Saborni Biswas, Joseph W Ziller, Michael P Hendrich, A S Borovik
Hydrogen bonds (H-bonds) within the secondary coordination sphere are often invoked as essential noncovalent interactions that lead to productive chemistry in metalloproteins. Incorporating these types of effects within synthetic systems has proven a challenge in molecular design that often requires the use of rigid organic scaffolds to support H-bond donors or acceptors. We describe the preparation and characterization of a new hybrid tripodal ligand ([H2 pout]3- ) that contains two monodeprotonated urea groups and one phosphinic amide...
October 9, 2018: Inorganic Chemistry
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