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Manganese oxide

G Kvaratskhelia, E Tikaradze, M Buleishvili, G Sharashenidze, G Ormotsadze, Т Sanikidze
The purpose of our study was to identify the nature of the cause-effect relationship between the risks of developing of Chronic Obstructive Pulmonary Disease (COPD) and Cardio-vascular Disease (CVD) in patients residing in the villages of Chiatura district, characterized by varying degrees of environmental stress. The residents (n=400) of the Chiatura district living in the villages, Khreiti, Perevisa and Rgani were examined. The villages are characterized by different degrees of ecological tension (the villages differ both in their remoteness from sources of environmental pollution - manganese mining quarries and the scale of its extraction, which allows them to rank according to the degree of environmental tension: Khreiti - low, Perevis - medium, Rgani - high)...
October 2018: Georgian Medical News
Stéphanie Bessette, Andrea Paolella, Chisu Kim, Wen Zhu, Pierre Hovington, Raynald Gauvin, Karim Zaghib
Time-of-flight secondary ion mass spectrometry (TOF-SIMS) using a focused ion-beam scanning electron microscope (FIB-SEM) is a promising and economical technique for lithium detection and quantification in battery materials because it overcomes the limitations with detecting low Li content by energy dispersive spectroscopy (EDS). In this work, an experimental calibration curve was produced, which to our best knowledge allowed for the first time, the quantification of lithium in standard nickel manganese cobalt oxide (NMC-532) cathodes using 20 nm resolution...
December 4, 2018: Scientific Reports
Nattapol Ma, Soracha Kosasang, Atiweena Krittayavathananon, Nutthaphon Phattharasupakun, Sathyamoorthi Sethuraman, Montree Sawangphruk
New insight into the influence of Li+, Na+, and K+ cations between adjacent layers of birnessite-type manganese oxides (MnOx) towards the intercalation/deintercalation charge storage mechanism as a neutral electrochemical capacitor (1 M Na2SO4) is demonstrated. These structural cations play a major role in both the kinetic electron transfer in a faradaic redox reaction and the accessibility of the compensating electrolyte ions. Li-MnOx shows the highest Mn utilization of 51% followed by Na-MnOx (40%) and K-MnOx (31%), respectively...
December 4, 2018: Chemical Communications: Chem Comm
Xiaolin Xing, Rongji Liu, Kecheng Cao, Ute Kaiser, Guangjin Zhang, Carsten Streb
The oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are key catalytic processes for sustainable energy technologies such as water electrolysis or fuel cells. Here, a novel metal oxide - nanostructured carbon composite is reported which acts as OER and ORR electrocatalyst under technologically relevant conditions. A facile synthetic process allows the deposition of a molecular manganese vanadium oxide precursor, [Mn4V4O17(OAc)3]3-, on reduced graphene oxide. Simultaneously, the precursor is converted into insoluble nanostructured solid-state Mn-V-oxide catalysts...
December 3, 2018: ACS Applied Materials & Interfaces
Yaxiong Xiao, Yabo Wang, Yi Xie, Haixiang Ni, Xiang Li, Yongkui Zhang, Tonghui Xie
Nanostructured manganese oxide materials were prepared from manganese-contained wastewater (MW) using a facile hydrothermal method and adopted as catalyst to degrade phenol via activation of peroxymonosulfate (PMS). In the WM environment, δ-MnO2 (flower-like Mn-2 with nanosheets) was transformed to α-MnO2 (needle-like Mn-4 with nanowires). Catalytic evaluation experiments demonstrated that the needle-like MnO2 was highly efficient for phenol removal, with a degradation efficiency of 100% within 15  min at the optimal conditions of catalyst dosage 0...
December 3, 2018: Environmental Technology
Bing Xiao, Xiaoxuan Zhou, Hongxia Xu, Bihan Wu, Ding Hu, Hongjie Hu, Kanyi Pu, Zhuxian Zhou, Xiangrui Liu, Jianbin Tang, Youqing Shen
Integration of biological macromolecules with inorganic materials via biomineralization has demonstrated great potential for development of nanotheranostic agents. To produce multifunctionality, integration of multiple components in the biomineralized theranostic agents is required; however, how to efficiently and reproducibly implement this is challenging. In this report, a universal biomineralization strategy is developed by incorporation of oxidization polymerization into albumin-templated biomineralization for facile synthesis of nanotheranostic agents...
December 3, 2018: ACS Nano
Ying Wang, Mei Zhang, Zhiping Li, Jianwei Yue, Min Xu, Yanhao Zhang, Ken Kin Lam Yung, Ruijin Li
Exposure to ambient fine particulate matter (PM2.5 ) is associated with neurodegenerative diseases. Mitochondrion is key to brain degeneration. However, the underlying mechanism of PM2.5 -induced brain injury, especially mitochondrial damage, is still unclear. In this study, changes in mitochondrial dynamics, mitochondrial permeability transition pore (mPTP), mitochondrial DNA (mtDNA) and oxidative stress in human SH-SY5Y cells exposed to PM2.5 at different concentrations (0, 25, 100, and 250 μg mL-1 ) were investigated...
November 23, 2018: Chemosphere
Paramasivam Balasubramanian, Muthaiah Annalakshmi, Shen-Ming Chen, Tamilarasan Sathesh, Tie-Kun Peng, Tst Balamurugan
Hydrogen peroxide (H2O2) is an eminent biomarker in pathogenesis; a selective, high sensitive real-time detection of H2O2 released from live cells have drawn a significant research interest in bio-analytical chemistry. Binary transition metal oxides (BTMOs) displayed the recognizable benefit in enhancing the sensitivity of H2O2 detection, though reported BTMOs based H2O2 sensor's detection limit is still insufficient, is not appropriate for in-situ profiling of trace amounts of cellular H2O2. In this, we describe an efficient, reliable electrochemical biosensor based on Mn2CuO4 microspheres to assay cellular H2O2...
November 29, 2018: ACS Applied Materials & Interfaces
Travis J Bourret, William K Boyle, Amanda Zalud, Jesus G Valenzuela, Fabiano Oliveira, Job E Lopez
The relapsing fever spirochete Borrelia turicatae possesses a complex life cycle in its soft-bodied tick vector, Ornithodoros turicata. Spirochetes enter the tick midgut during a bloodmeal, and during the following weeks spirochetes disseminate throughout O. turicata. A population persists in the salivary glands allowing for rapid transmission to mammalian hosts during tick feeding. Little is known about the physiological environment within the salivary glands acini in which B. turicatae persists. In this study, we examined the salivary gland transcriptome of O...
November 29, 2018: Cellular Microbiology
Hitesh Saravaia, Hariom Gupta, Pooja Popat, Parthrajsinh Sodha, Vaibhav Kulshrestha
Magnesium doped lithium manganese oxide nanosorbent is prepared by a single step solid state method and characterized with appropriate analytical techniques, adsorption kinetic model and isotherms. Competitive and non-competitive adsorption studies are performed for a range of heavy metal ions. Prepared nanosorbent has shown explicit selectivity for various heavy metal ions and no remarkable influence of coexisting common interfering ions (Na+, K+, Mg2+ and Ca2+) which are generally coexist with all natural sources of water, contaminated water and industrial waste...
November 29, 2018: ACS Applied Materials & Interfaces
Kpobari W Nkpaa, Ifeoluwa O Awogbindin, Benjamin A Amadi, Amos O Abolaji, Isaac A Adedara, Matthew O Wegwu, Ebenezer O Farombi
This study investigated the effects of ethanol (EtOH) on manganese (Mn)-induced striatal toxicity in rat by evaluating the neurobehavioral changes, biochemical and molecular events in rats exposed to Mn alone at 30 mg/kg, or their combination with EtOH at 1.25- and 5-g/kg body weight for 35 consecutive days. Locomotive and exploratory profiles were assessed using a video tracking software (ANY-Maze software) during a 5-min trial in a novel environment. Subsequently, acetylcholinesterase (AChE) activity, oxidative stress markers, histological morphology, and expression of apoptotic proteins (p53 and Bax and caspase-3) and anti-apoptotic protein (Bcl-2) were assessed in the striatum...
November 28, 2018: Biological Trace Element Research
Michael Medina, Antonia Rizo, David Dinh, Briana Chau, Moussa Omidvar, Andrew Juarez, Julia Ngo, Hope A Johnson
Bacterial manganese (Mn) oxidation is catalyzed by a diverse group of microbes and can affect the fate of other elements in the environment. Yet, we understand little about the enzymes that catalyze this reaction. The Mn oxidizing protein MopA, from Erythrobacter sp. strain SD-21, is a heme peroxidase capable of Mn(II) oxidation. Unlike Mn oxidizing multicopper oxidase enzymes, an understanding of MopA is very limited. Sequence analysis indicates that MopA contains an N-terminal heme peroxidase domain and a C-terminal calcium binding domain...
2018: Frontiers in Microbiology
Kyoichi Iizumi, Hiroaki Kawasaki, Ayako Shigenaga, Mitsutoshi Tominaga, Ayaka Otsu, Atsuko Kamo, Yayoi Kamata, Kenji Takamori, Fumiyuki Yamakura
To reduce the incidence and severity of atopic dermatitis, detection and treatment at an early stage are urgently required, but no effective biomarker has been reported. In this study, we attempted to detect a candidate biomarker of early stage atopic dermatitis by focusing on the levels of nitrated residues in the plasma proteins of atopic dermatitis model mice (NC/Nga mice). We found that the immunoglobulin (Ig) light chain was more highly nitrated in the plasma of the animal model than that of control mice...
November 2018: Journal of Clinical Biochemistry and Nutrition
Martin Eckert, Willi Peters, Jean-Francois Drillet
This work reports on the synthesis of layered manganese oxides (δ-MnO₂) and their possible application as cathode intercalation materials in Al-ion and Zn-ion batteries. By using a one-pot microwave-assisted synthesis route in 1.6 M KOH (MnVII :MnII = 0.33), a pure layered δ-MnO₂ birnessite phase without any hausmannite traces was obtained after only a 14 h reaction time period at 110 °C. Attempts to enhance crystallinity level of as-prepared birnessite through increasing of reaction time up to 96 h in 1...
November 28, 2018: Materials
P Kanchana, N Sudhan, C Sekar, G Neri
Manganese (Mn) doped hydroxyapatite (HA) nanoparticles were synthesized by a simple microwave irradiation method and characterized using XRD, SEM, micro-Raman, FTIR, XPS and vibrating sample magnetometer (VSM) methods. The as prepared 3 M% Mn doped HA (3 M% Mn-HA) nanoparticles modified glassy carbon electrode (GCE) showed an excellent electrocatalytic activity towards the oxidation of hydroquinone (HQ). The electrochemical studies demonstrated that the 3 M% Mn-HA nanoparticles modified GCE detects HQ linearly over a wide concentration range of 1...
April 1, 2019: Journal of Nanoscience and Nanotechnology
Shishu Zhu, Xiaojie Li, Jian Kang, Xiaoguang Duan, Shaobin Wang
Minerals and transitional metal oxides of earth-abundant elements are desirable catalysts for in situ chemical oxidation in environmental remediation. However, catalytic activation of peroxydisulfate (PDS) by manganese oxides was barely investigated. In this study, one-dimension manganese dioxides (α- and β-MnO2) were discovered as effective PDS activators among the diverse manganese oxides for selective degradation of organic contaminants. Compared with other chemical states and crystallographic structures of manganese oxide, β-MnO2 nanorods exhibited the highest phenol degradation rate (0...
November 27, 2018: Environmental Science & Technology
Yacine Cherifi, Ahmed Addad, Hervé Vezin, Alexandre Barras, Baghdad Ouddane, Ahcène Chaouchi, Sabine Szunerits, Rabah Boukherroub
This study addresses the influence of ultrasound irradiation on the activation of peroxymonosulfate (PMS) using reduced graphene oxide (rGO) under metal-free conditions for the catalytic degradation of rhodamine B (RhB), bisphenol A (BPA) and tetracycline (TC). Our results revealed that the combination of PMS/rGO and ultrasonication enhanced significantly the degradation rate, reaching full degradation in relatively short times with total organic carbon (TOC) removal exceeding 85% of the investigated pollutants...
November 13, 2018: Ultrasonics Sonochemistry
Xiao Ying Liu, Tian Cheng Gong, Jie Zhang, Junyi Ji, Wang Chen Huo, Tong Cao, Yu Xin Zhang, Xianming Zhang, Yunqi Liu
Improving the rate capability of transition metal oxides is of great important for the development of high-performance electrodes for supercapacitors. Here, a novel strategy of hydrogenation to enhance the electron transfer rate of manganese dioxide (MnO2 ) is proposed. Detailed preparative parameters (i.e. hydrogenation temperature and time) are systematically investigated. The hydrogenated MnO2 (H-MnOx ) exhibits modified crystal phase/surface structures and increased electrical conductivity. The prepared H-MnOx exhibits high specific capacitance (640 mF cm-2 at current density of 1 mA cm-2 ), good rate capability (89...
November 20, 2018: Journal of Colloid and Interface Science
Ni Yan, Hua Zhong, Mark L Brusseau
The ability of soils and sediments to promote in-situ activation of persulfate and persulfate combined with hydrogen peroxide was investigated for treatment of 1,4-dioxane (dioxane). Experiments were conducted with both batch-reactor and column systems to examine reaction rates and activation mechanisms. Four soils and aquifer sediments were used. ICP-MS and XRD analyses were used to characterize geochemical properties of the solutions and sediments, while EPR spectroscopy was used to characterize radical formation...
November 14, 2018: Water Research
Alessio Crestini, Rosa Vona, Maria Lo Giudice, Marco Sbriccoli, Paola Piscopo, Antonella Borrelli, Roberto Rivabene, Laura Ricceri, Aldo Mancini, Annamaria Confaloni
We have recently isolated a new isoform of recombinant manganese superoxide dismutase (rMnSOD) which provides a potent antitumor activity and strongly counteracts the occurrence of oxidative stress and tissue inflammation. This isoform, in addition to the enzymatic action common to all SODs, also shows special functional and structural properties, essentially due to the presence of a first leader peptide that allows the protein to enter easily into cells. Among endogenous antioxidants, SOD constitutes the first line of natural defence against pathological effects induced by an excess of free radicals...
November 23, 2018: Neurochemical Research
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