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Manganese oxide

Manju S Devi, R B Sashidhar
Aflatoxins are potent carcinogenic mycotoxins produced as secondary metabolites mainly by the fungi Aspergillus flavus and Aspergillus parasiticus. Control measures to curtail the contamination of aflatoxin in food products is still a challenge. Although there are several reports on the antifungal peptides, there is no specific study on the action of antifungal peptides on aflatoxin synthesis. This work details the effect of four antimicrobial peptides (AMPs) - PPD1 (FRLHF), 66-10 (FRLKFH), 77-3 (FRLKFHF) and D4E1 (FKLRAKIKVRLRAKIKL) on the aflatoxin production by A...
February 15, 2019: Peptides
Ying Gan, Ning Hu, Chuanjiang He, Shuqi Zhou, Jiawei Tu, Tao Liang, Yuxiang Pan, Dmitry Kirsanov, Andrey Legin, Hao Wan, Ping Wang
Urolithiasis commonly occurs in kidney and ureteral, and may cause local organ/tissue damage, even kidney failure. The incidence of this disease is increasing worldwide, in which calcium oxalate is the major composition forming the urinary calculus. Therefore, to monitor this disease for the prevention and treatment, measuring the oxalate in the urine is of great significance. Here, a rapid and sensitive colorimetric method was developed based on 3,3',5,5'-tetramethylbenzidine-manganese dioxide (TMB-MnO2 ) nanosheets for oxalate detection...
January 21, 2019: Biosensors & Bioelectronics
Suiyi Zhu, Xue Lin, Ge Dong, Yang Yu, Hongbin Yu, Dejun Bian, Lanhe Zhang, Jiakuan Yang, Xianze Wang, Mingxin Huo
Mn-containing sludge from groundwater treatment was converted to magnetic particles (MPs) via a one-step hydrothermal method using sodium ascorbate (SA) as the reductant. The MPs were characterized by X-ray diffraction spectroscopy, Mössbauer spectroscopy, X-ray fluorescence spectroscopy, magnetometry and Gran titration and the results showed that magnetic jacobsite was obtained as an intermediate product in transformation of Fe/Mn oxides to siderite and rhodochrosite. When the molar ratio of SA to Mn in the sludge was two, the produced MPs-2 contained a mixture of ferrihdyrite, hematite, jacobsite and Si/Al oxides, and could magnetize at 2...
February 12, 2019: Journal of Environmental Management
Stephany S Chacon, Patrick N Reardon, Christopher James Burgess, Samuel Owen Purvine, Rosalie K Chu, Therese Rw Clauss, Eric D Walter, David D Myrold, Nancy Washton, Markus Kleber
We investigated the extent to which contact with mineral surfaces affected the molecular integrity of a model protein, with an emphasis on identifying the mechanisms (hydrolysis, oxidation) and conditions leading to protein alteration. To this end, we studied the ability of four mineral surface archetypes (negatively charged, positively charged, neutral, redox-active) to abiotically fragment a well-characterized protein (GB1) as a function of pH and contact time. GB1 was exposed to the soil minerals montmorillonite, goethite, kaolinite, and birnessite at pH 5 and pH 7 for 1, 8, 24, and 168 hours and the supernatant was screened for peptide fragments using Tandem Mass Spectrometry...
February 15, 2019: Environmental Science & Technology
Carlos Caro, David Egea-Benavente, Rocio Polvillo, Jose Luis Royo, Manuel Pernia Leal, María Luisa García-Martín
Magnetic nanoparticles (MNPs) represent one of the greatest promises for the development of a new generation of diagnostic agents for magnetic resonance imaging, with improved specificity and safety. Indeed, during the last decade the number of studies published in this field has grown exponentially. However, the clinical translation achieved so far has been very limited. This situation is likely related to the fact that most studies are focused on the in vitro characterization of these new nanomaterials, and very few provide an exhaustive in vivo characterization, where key aspects, such as pharmacokinetics, bioavailability, and, most importantly, toxicity, are properly evaluated...
February 3, 2019: Colloids and Surfaces. B, Biointerfaces
R V Lakshmi, Parthasarathi Bera, R P S Chakradhar, Balamati Choudhury, Shital Patangrao Pawar, Suryasarathi Bose, Raveendranath U Nair, Harish C Barshilia
A manganese based spinel ferrite, chemically modified with polymethyl methacrylate (PMMA) and polyaniline (PANI) are synthesized and their composites are used as electromagnetic interference (EMI) shielding materials. X-ray diffraction studies show that the as-prepared manganese ferrite crystallizes in a cubic spinel structure. The particles are highly agglomerated and nanocrystalline as indicated by transmission electron microscopy. Manganese exists in +2 and +4 oxidation states and Fe in +2 and +3 oxidation states...
February 14, 2019: Physical Chemistry Chemical Physics: PCCP
Alexandra J White, Clarice R Weinberg, Ellen S O'Meara, Dale P Sandler, Brian L Sprague
BACKGROUND: Breast density is strongly related to breast cancer. Identifying associations between environmental exposures and density may elucidate relationships with breast cancer. Metals and polycyclic aromatic hydrocarbons (PAHs) may influence breast density via oxidative stress or endocrine disruption. METHODS: Study participants (n = 222,581) underwent a screening mammogram in 2011 at a radiology facility in the Breast Cancer Surveillance Consortium. Zip code residential levels of airborne PAHs and metals (arsenic, cadmium, chromium, cobalt, lead, manganese, mercury, nickel, and selenium) were assessed using the 2011 EPA National Air Toxics Assessment...
February 13, 2019: Breast Cancer Research: BCR
Tim Sieber, Jana Ducke, Anja Rietig, Thomas Langner, Jörg Acker
Nickel⁻manganese⁻cobalt oxides, with LiNi0.33 Mn0.33 Co0.33 O₂ (NMC) as the most prominent compound, are state-of-the-art cathode materials for lithium-ion batteries in electric vehicles. The growing market for electro mobility has led to a growing global demand for Li, Co, Ni, and Mn, making spent lithium-ion batteries a valuable secondary resource. Going forward, energy- and resource-inefficient pyrometallurgical and hydrometallurgical recycling strategies must be avoided. We presented an approach to recover NMC particles from spent lithium-ion battery cathodes while preserving their chemical and morphological properties, with a minimal use of chemicals...
February 12, 2019: Nanomaterials
Pan Chen, Melissa Totten, Ziyan Zhang, Hana Bucinca, Keith Erikson, Abel Santamaría, Aaron B Bowman, Michael Aschner
Iron (Fe) and manganese (Mn) are essential nutrients for humans. They act as cofactors for a variety of enzymes. In the central nervous system (CNS), these two metals are involved in diverse neurological activities. Dyshomeostasis may interfere with the critical enzymatic activities, hence altering the neurophysiological status and resulting in neurological diseases. Areas covered: In this review, the authors cover the molecular mechanisms of Fe/Mn-induced toxicity and neurological diseases, as well as the diagnosis and potential treatment...
February 13, 2019: Expert Review of Neurotherapeutics
Namrata Singh, Mohammed Azharuddin Savanur, Shubhi Srivastava, Patrick D'Silva, Govindasamy Mugesh
Biocompatible nanoparticles with an intrinsic ability to mimic the cellular antioxidant enzymes are potential candidates for the development of new therapeutics for various oxidative stress related disorders. However, the understanding of the interaction and the mechanistic crosstalk between the nanoparticles and the cellular biomolecules is limited. Here we show that the multienzyme mimic manganese(ii,iii) oxide, Mn3O4, in nanoform (Mp) rescues the cells from oxidative damage induced by reactive oxygen species (ROS)...
February 13, 2019: Nanoscale
Xueting Zhai, Zhuoyao Li, Zichen Lu, Guilin Wang, Ping Li, Yongqian Gao, Xiao Huang, Wei Huang, Hiroshi Uji-I, Gang Lu
Bismuth vanadate (BiVO4 ) microcrystals enclosed with up to 42 low and high index facets were synthesized through truncation of BiVO4 octahedral crystals via a simple and highly reproducible hydrothermal method. The size and shape of the truncated BiVO4 crystals could be tuned by varying the acid concentration, reaction temperature and reaction period. Compared to the BiVO4 octahedral crystals without truncation, the 42-faceted ones showed an enhanced photocatalytic activity in the degradation of rhodamine B molecules due to the enhanced charge separation on the exposed low and high index facets...
February 4, 2019: Journal of Colloid and Interface Science
Zhaohui Zi, Baozhong Zhu, Yunlan Sun, Qilong Fang, Tingting Ge
Manganese (Mn)-modified ferric oxide/nickel foam (Fe/Ni) catalysts were prepared using Ni as a carrier, Fe and Mn as active components to study NH3 -SCR of NOx at low temperature. The effects of different Fe loads and Mn-modified Fe/Ni catalysts on the DeNOx activity were investigated. Results show that when the amount of Fe is 10%, Fe/Ni catalyst has the highest NOx conversion. For the Mn-modified Fe/Ni catalysts, the NOx conversions firstly increase and then decrease with the Mn loading amount increasing...
February 12, 2019: Environmental Science and Pollution Research International
Goknur Ozaydin-Yavuz, Ibrahim Halil Yavuz, Halit Demir, Canan Demir, Serap Gunes Bilgili
Background: Alopecia areata (AA) is a noncicatricial alopecia affecting any hair-bearing area. Although AA is considered to be an autoimmune disease, oxidative stress has been shown to be an important factor in the etiology of AA. Trace elements are highly essential for humans since they form the building blocks of large molecules, function as the cofactors of enzymes, and have some key biological functions. The aim of this study was to investigate serum levels of heavy metals like iron (Fe), zinc (Zn), manganese (Mn), copper (Cu), magnesium (Mg), cobalt (Co), cadmium (Cd), and lead (Pb) in patients with AA...
January 2019: Indian Journal of Dermatology
Jing Wang, Ping-Mei Wang, Yi Gu, Peter M Kopittke, Fangjie Zhao, Peng Wang
The pre-harvest drainage of rice paddy fields during the grain filling stage can result in a substantial mobilization of Cd in soil and consequently elevated grain Cd concentration. However, the processes controlling the mobilization of Cd remains poorly understood. Using twelve field-contaminated paddy soils, we investigated the factors controlling the temporal changes in Cd solubility in paddy soils that were incubated anaerobically for 40 d followed by a 20 d oxidation period. Soluble and extractable Cd concentrations decreased rapidly upon flooding but increased during the oxidation phase, with Cd solubility (aqueous Cd/soil Cd) largely depending upon porewater pH...
February 11, 2019: Environmental Science & Technology
Vít Herynek, Karolína Turnovcová, Andrea Gálisová, Ondřej Kaman, Dana Mareková, Jakub Koktan, Magda Vosmanská, Lucie Kosinová, Pavla Jendelová
Manganese-zinc ferrite nanoparticles were synthesized by using a hydrothermal treatment, coated with silica, and then tested as efficient cellular labels for cell tracking, using magnetic resonance imaging (MRI) in vivo. A toxicity study was performed on rat mesenchymal stem cells and C6 glioblastoma cells. Adverse effects on viability and cell proliferation were observed at the highest concentration (0.55 mM) only; cell viability was not compromised at lower concentrations. Nanoparticle internalization was confirmed by transmission electron microscopy...
February 2019: ChemistryOpen
Paula Moyano, José Manuel García, María José Anadon, Margarita Lobo, Jimena García, María Teresa Frejo, Emma Sola, Adela Pelayo, Javier Del Pino
Manganese (Mn) induces cognitive disorders and basal forebrain (BF) cholinergic neuronal loss, involved on learning and memory regulation, which could be the cause of such cognitive disorders. However, the mechanisms through which it induces these effects are unknown. We hypothesized that Mn could induce BF cholinergic neuronal loss through oxidative stress generation, cholinergic transmission and AChE variants alteration that could explain Mn cognitive disorders. This study shows that Mn impaired cholinergic transmission in SN56 cholinergic neurons from BF through alteration of AChE and ChAT activity and CHT expression...
February 7, 2019: Food and Chemical Toxicology
Usha F Lingappa, Danielle R Monteverde, John S Magyar, Joan Selverstone Valentine, Woodward W Fischer
Throughout the history of life on Earth, abiotic components of the environment have shaped the evolution of life, and in turn life has shaped the environment. The element manganese embodies a special aspect of this collaboration; its history is closely entwined with those of photosynthesis and O2 -two reigning features that characterize the biosphere today. Manganese chemistry was central to the environmental context and evolutionary innovations that enabled the origin of oxygenic photosynthesis and the ensuing rise of O2 ...
February 7, 2019: Free Radical Biology & Medicine
Biswanath Dutta, Ryan Clarke, Sumathy Raman, Timothy D Shaffer, Laura Achola, Partha Nandi, Steven L Suib
Herein we report the first example of the catalytic aerobic partial oxidation of allyl ether to its acrylate ester derivative. Many partial oxidations often need an expensive oxidant such as peroxides or other species to drive such reactions. In addition, selective generation of esters using porous catalysts has been elusive. This reaction is catalyzed by a Li ion promoted mesoporous manganese oxide (meso-Mn2 O3 ) under mild conditions with no precious metals, a reusable heterogeneous catalyst, and easy isolation...
February 8, 2019: Nature Communications
Abdullah Al-Khaldi, Samar Sultan
BACKGROUND: Sirtuin 1 (SIRT1) and sirtuin 3 (SIRT3) proteins have an important role in counteracting oxidative stress. Although diabetes and hypothyroidism (HT) are both characterized by oxidative stress, the mechanisms are not fully understood. This study investigated the effects of type 1 diabetes (T1D), type 2 diabetes (T2D), and HT on the expression levels of SIRT1, SIRT3, and manganese superoxide dismutase (SOD2). METHODS: Gene expression of SIRT1, SIRT3, and SOD2 was measured using real-time PCR...
February 8, 2019: BMC Endocrine Disorders
Aydan Caglayan, Doruk Cevdi Katlan, Zafer Selcuk Tuncer, Kunter Yüce
Epithelial ovarian cancer (EOC) has been associated with oxidative stress (OS) due to epithelial inflammation which makes ovaries more vulnerable to the deleterious effects of reactive oxygen species (ROS). However, antioxidant enzymes (AOEs) such as manganese-superoxide dismutase (Mn-SOD), copper,zinc-superoxide dismutase (Cu,Zn-SOD) and glutathione peroxidase (GPx1) protect cells against the biological damage of ROS-induced OS and support cancer prevention by maintaining normal cell cycle progression, inhibiting proliferation, tumor invasion, angiogenesis, inflammation or inducing apoptosis...
March 2019: Journal of Trace Elements in Medicine and Biology
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