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Manganese oxide

Yongbeom Seo, Jiayu Leong, Jun Dong Park, Yu-Tong Hong, Sang-Hyon Chu, Cheol Park, Dong Hyun Kim, Yu-Heng Deng, Vitaliy Dushnov, Joonghui Soh, Simon Rogers, Yi Yan Yang, Hyunjoon Kong
Bacterial biofilms form on and within many living tissues, medical devices, and engineered materials, threatening human health and sustainability. Removing biofilm remains a grand challenge despite tremendous efforts made so far, particularly when they are formed in confined spaces. One primary cause is the limited transport of anti-bacterial agents into extracellular polymeric substances (EPS) of the biofilm. In this study, we hypothesized that a microparticle engineered to be self-motile with microbubbles would clean a structure fouled by biofilm by fracturing the EPS and subsequently improving transports of the antiseptic reagent...
August 14, 2018: ACS Applied Materials & Interfaces
Mahsa Souri, Vahid Hoseinpour, Alireza Shakeri, Nasser Ghaemi
This study concerns the optimisation of green synthesis of manganese oxide nanoparticles (MnO NPs) with Dittrichia graveolens (L.) extract via response surface methodology (RSM). Central composite design was used to evaluate the effect of pH, time, and the extract to the metal ratio on the synthesised nanoparticles (NPs). Nine runs were designed to investigate the effect of each parameter while NPs were synthesised under different conditions. Considering the p -values ( p -value < 0.05), it is indicated that the extract to the metal ratio was the most effective parameter...
September 2018: IET Nanobiotechnology
Asghar Ashrafi Hafez, Parvaneh Naserzadeh, Khadijeh Ashtari, Amir Mohammad Mortazavian, Ahmad Salimi
Metal nanoparticles (NPs) have been extensively used in industry as well as in biomedical application. Manganese oxide-nanoparticles (MnO2 -NPs) one of these materials, have many applications. This study was designed to evaluate the protective role of vitamin D against MnO2 -NPs -induced toxicity in the BALB c mice. These mice were randomly assigned to 4 (n = 10). In this study, MnO2 -NPs (10 mg/kg), vitamin D (10 mg/kg) and MnO2 -NPs plus vitamin D were administered interperitoneally once daily for 50 consecutive days...
August 10, 2018: Regulatory Toxicology and Pharmacology: RTP
Mani Balamurugan, Natarajan Saravanan, Heonjin Ha, Yoon Ho Lee, Ki Tae Nam
Manganese plays multiple role in many biological redox reactions in which it exists in different oxidation states from Mn(II) to Mn(IV). Among them the high-valent manganese-oxo intermediate plays important role in the activity of certain enzymes and lessons from the natural system provide inspiration for new developments of artificial systems for a sustainable energy supply and various organic conversions. This review describes recent advances and key lessons learned from the nature on high-valent Mn-oxo intermediates...
2018: Nano Convergence
Chiaki Hori, Jill Gaskell, Dan Cullen, Grzegorz Sabat, Philip E Stewart, Kathleen Lail, Yi Peng, Kerrie Barry, Igor V Grigoriev, Annegret Kohler, Laure Fauchery, Francis Martin, Carolyn A Zeiner, Jennifer M Bhatnagar
Fungi play a key role cycling nutrients in forest ecosystems but the mechanisms remain uncertain. To clarify the enzymatic processes involved in wood decomposition, metatranscriptomics and metaproteomics of extensively decayed lodgepole pine were examined by RNAseq and LC-MS/MS, respectively. Following de novo metatranscriptome assembly, 52,011 contigs were searched for functional domains and homology to database entries. Contigs similar to to basidiomycete transcripts dominated and many of these were most closely related to ligninolytic white rot fungi or cellulolytic brown rot fungi...
August 10, 2018: Applied and Environmental Microbiology
Karuppasamy Prem Ananth, Jinxing Sun, Jiaming Bai
In this paper, the synthesis of porous manganese substituted hydroxyapatite (Mn-HAp) coating on zinc oxide (ZnO) coated stainless steel (316L SS) using the electrodeposition technique is reported. The structural, functional, morphological, and elemental analyses are characterized by various analytical techniques including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS)...
August 9, 2018: International Journal of Molecular Sciences
Bushra Tehseen, Asma Rehman, Muniba Rahmat, Haq Nawaz Bhatti, Aiguo Wu, Faheem K Butt, Gul Naz, Waheed S Khan, Sadia Z Bajwa
This work is the first report describing the solution grown 3D manganese oxide nanofibrous (MnO2 NFs) mesh and its potential for the simultaneous detection of biomolecules such as ascorbic acid and uric acid. The mesh is synthesized by a facile, one-pot, and cost-effective hydrothermal approach without using any template or structure directing compound. The morphology consists of randomly placed nanofibres possessing a diameter in the range of 10-25 nm, and length of several micron; constituting a highly porous and flexible material...
October 15, 2018: Biosensors & Bioelectronics
Reza Karimi Shervedani, Marzieh Samiei Foroushani, Amirhosein Kefayat, Mostafa Torabi, Fatemeh Rahnemaye Rahsepar
Construction of hybrid systems that combine the cancer treatment and diagnosis agents on a single platform, known as theranostic systems, have received great attentions in the field of nanobiomedicine. Here, construction and characterization of a new multifunctional hybrid theranostic system based on RGO, PDA, BSA, DTPA-Mn(II), and MTX constituents, is presented. Accordingly, GO is partially reduced and simultaneously functionalized by dopamine, leading to reduced graphene oxide/polydopamine, RGO-PDA system; and then, the bovine serum albumin protein (BSA) is grafted onto this system...
October 15, 2018: Biosensors & Bioelectronics
Yong Zhang, Chengcheng Wang, Jiali Fu, Hui Zhao, Fang Tian, Renjie Zhang
Manganese oxide nanopyramids (MONPMs) with enriched oxygen vacancies (OVs) are vertically grown on nitrogen doped carbon (NC) microlaminate arrays with narrow spacing, yielding a high performance for the oxygen reduction reaction (ORR).
August 10, 2018: Chemical Communications: Chem Comm
Lihua Zhou, Yayun Wu, Xiaoqing Meng, Sanpeng Li, Jiali Zhang, Ping Gong, Pengfei Zhang, Tao Jiang, Guanjun Deng, Wenjun Li, Zhihong Sun, Lintao Cai
Phototherapy is a promising treatment method for cancer therapy. However, the various factors have greatly restricted phototherapy development, including the poor accumulation of photosensitizer in tumor, hypoxia in solid tumor tissue and systemic phototoxicity. Herein, a mitochondrial-targeted multifunctional dye-anchored manganese oxide nanoparticle (IR808@MnO NP) is developed for enhancing phototherapy of cancer. In this nanoplatform, IR808 as a small molecule dye acts as a tumor targeting ligand to make IR808@MnO NPs with capacity to actively target tumor cells and relocate finally in the mitochondria...
August 10, 2018: Small
Fusheng Zhao, Fang Lei, Xiang Yan, Senfeng Zhang, Wen Wang, Yu Zheng
BACKGROUND/AIMS: Cigarette smoke exposure (CSE) during pregnancy is a well-recognized health hazard that causes placental damage. Hydrogen sulfide (H2S) has been reported to protect multiple organs from injury. However, the protective effects of H2S have not been tested in the placenta. This study aimed to explore the potential of H2S in protecting placenta against oxidative injury induced by CSE during pregnancy and the possible underlying mechanisms. METHODS: Pregnant SD rats were randomly divided into 4 groups: NaCl, NaHS (a donor of H2S), CSE and CSE+NaHS...
August 9, 2018: Cellular Physiology and Biochemistry
Mian Guo, Yong-Min Lee, Mi Sook Seo, Yong-Ju Kwon, Xiao-Xi Li, Takehiro Ohta, Won-Suk Kim, Ritimukta Sarangi, Shunichi Fukuzumi, Wonwoo Nam
Mn(III)-iodosylarene porphyrin adducts, [Mn(III)(ArIO)(Porp)]+ , were synthesized by reacting electron-deficient Mn(III) porphyrin complexes with iodosylarene (ArIO) at -60 °C and characterized using various spectroscopic methods. The [Mn(III)(ArIO)(Porp)]+ species were then investigated in the epoxidation of olefins under stoichiometric conditions. In the epoxidation of olefins by the Mn(III)-iodosylarene porphyrin species, epoxide was formed as the sole product with high chemoselectivities and stereoselectivities...
August 6, 2018: Inorganic Chemistry
Michela Milan, Michela Salamone, Miquel Costas, Massimo Bietti
Aliphatic C-H bond functionalization is at the frontline of research because it can provide straightforward access to simplified and cost-effective synthetic procedures. A number of these methodologies are based on hydrogen atom transfer (HAT), which, as a consequence of the inert character of C-H bonds, often represents the most challenging step of the overall process. Because the majority of organic molecules contain multiple nonequivalent C-H bonds that display similar chemical properties, differentiating between these bonds with high levels of selectivity represents one of the most challenging issues...
August 6, 2018: Accounts of Chemical Research
Nan-Qing Zhou, Dong-Feng Liu, Di Min, Lei Cheng, Xue-Na Huang, Li-Jiao Tian, Dao-Bo Li, Han-Qing Yu
Ciprofloxacin (CIP), as an extensively used antibiotic, has been widely detected at a high level in the environment and has raised environmental pollution concerns. Thus, efficient and cost-effective methods for CIP degradation are highly desired. Biologically produced manganese oxides (BioMnOx ) offer a promising perspective for CIP degradation because of their catalytic reactivity and cost-effectiveness. However, the release of Mn(II) from BioMnOx prevents the further oxidation of pollutants. As a consequence, continuous CIP degradation by BioMnOx is not feasible...
July 31, 2018: Chemosphere
Ryan J Martinie, Elizabeth J Blaesi, J Martin Bollinger, Carsten Krebs, Kenneth D Finkelstein, Christopher Pollock
Proton transfer reactions are of central importance to a wide variety of biochemical processes, though determining proton location and monitoring proton transfers in biological systems is often extremely challenging. Herein, we use two-color valence-to-core x-ray emission spectroscopy (VtC XES) to identify protonation events across three oxidation states of the O₂-activating, radical-initiating manganese-iron heterodinuclear cofactor in a class I-c ribonucleotide reductase. This is the first application of VtC XES to an enzyme intermediate and the first simultaneous measurement of two-color VtC spectra...
August 3, 2018: Angewandte Chemie
Nils Schuth, Ivelina Zaharieva, Petko Chernev, Gustav Berggren, Magnus Anderlund, Stenbjörn Styring, Holger Dau, Michael Haumann
The unique manganese-calcium catalyst in photosystem II (PSII) is the natural paragon for efficient light-driven water oxidation to yield O2 . The oxygen-evolving complex (OEC) in the dark-stable state (S1 ) comprises a Mn4 CaO4 core with five metal-bound water species. Binding and modification of the water molecules that are substrates of the water-oxidation reaction is mechanistically crucial but controversially debated. Two recent crystal structures of the OEC in its highest oxidation state (S3 ) show either a vacant Mn coordination site or a bound peroxide species...
August 1, 2018: Inorganic Chemistry
Steffen Schlueter, Ronny Genieser, Daniel Richards, Harry E Hoster, Michael P Mercer
Measurements of the open circuit voltage of Li-ion cells have been extensively used as a non-destructive characterisation tool. Another technique based on entropy change measurements has also been applied for this purpose. More recently, both techniques have been used to make qualitative statements about aging in Li-ion cells. One proposed cause of cell failure is point defect formation in the electrode materials. The steps in voltage profiles, and the peaks in entropy profiles are sensitive to order/disorder transitions arising from Li/vacancy configurations, which are affected by the host lattice structures...
August 1, 2018: Physical Chemistry Chemical Physics: PCCP
Patcharee Isarankura-Na-Ayudhya, Chadinee Thippakorn, Supitcha Pannengpetch, Sittiruk Roytrakul, Chartchalerm Isarankura-Na-Ayudhya, Nipawan Bunmee, Suchitra Sawangnual, Virapong Prachayasittikul
The underlying mechanism and cellular responses of bacteria against toxic cadmium ions is still not fully understood. Herein, Escherichia coli TG1 expressing hexahistidine-green fluorescent protein (His6GFP) and cells expressing polyhistidine-fused to the outer membrane protein A (His-OmpA) were applied as models to investigate roles of cytoplasmic metal complexation and metal chelation at the surface membrane, respectively, upon exposure to cadmium stress. Two-dimensional gel electrophoresis (2-DE) and two-dimensional difference in gel electrophoresis (2D-DIGE) in conjunction with mass spectrometry-based protein identification had successfully revealed the low level expression of antioxidative enzymes and stress-responsive proteins such as manganese-superoxide dismutase (MnSOD; +1...
2018: PeerJ
Bijan Esmaeilnejad, Mousa Tavassoli, Awat Samiei, Nasser Hajipour, Abbas Imani-Baran, Farhad Farhang-Pajuh
This study was undertaken to assess the influence of an Anaplasma marginale infection on oxidative stress and antioxidant status, trace elements and cholinesterase as markers of the inflammatory process and biomarkers of oxidative imbalance. An infected group comprised of 35 crossbred Holstein cattle, about 2-3 years old, naturally infected with Anaplasma marginale, were divided into 4 subgroups according to their parasitemia rates (<1%, 1-10%, 10-20%, >20%) and also 10 healthy cattle as control were selected...
July 28, 2018: Microbial Pathogenesis
Jan Jankowski, Katarzyna Ognik, Anna Stępniowska, Zenon Zduńczyk, Krzysztof Kozłowski
The aim of the study was to determine whether the use of Mn nanoparticles would make it possible to reduce the level of this micronutrient added to turkey diets without adversely affecting growth performance, antioxidant and immune status, or apoptosis. The experiment was conducted on 6 groups of turkeys with 10 replications in a two-factor design with 3 dosages of manganese, 100, 50 and 10 mg/kg, and 2 sources, manganese oxide (MnO) and manganese nanoparticles (NP-Mn2O3). The study showed that irrespective of the form of Mn used, reducing the Mn level recommended by British United Turkeys for supplementation of the diet of young turkeys from 100 mg/kg to 10 mg/kg increases the content of this element in the blood with no adverse effect on growth performance or the immune system...
2018: PloS One
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