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https://www.readbyqxmd.com/read/29345355/effects-of-antioxidants-on-apoptosis-induced-by-dasatinib-and-nilotinib-in-k562-cells
#1
Sara Damiano, Serena Montagnaro, Maria Valeria Puzio, Lorella Severino, Ugo Pagnini, Marcella Barbarino, Daniele Cesari, Antonio Giordano, Salvatore Florio, Roberto Ciarcia
In clinical practice for the treatment of chronic myeloid leukemia, second generation of tyrosine kinase inhibitors such as Nilotinib (NIL) specific and potent inhibitor of the BCR/ABL kinase and Dasatinib (DAS) a inhibitor of BCR/ABL and Src family kinase were developed to clinically overcome imatinib resistance. In this study we wanted to test the ability of some antioxidants such Resveratrol (RES) or a new recombinant mitochondrial manganese containing superoxide dismutase (rMnSOD) or δ-tocotrienol (δ-TOCO) to interact with DAS and NIL on viability, reactive oxygen species (ROS) production, lipid peroxidation and apoptosis...
January 18, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29342122/synthesis-and-characterization-of-a-heterometallic-extended-architecture-based-on-a-manganese-ii-substituted-sandwich-type-polyoxotungstate
#2
Masooma Ibrahim, Eufemio Moreno-Pineda, Thomas Bergfeldt, Christopher E Anson, Annie K Powell
The reaction of [α-P₂W15O56]12- with MnII and DyIII in an aqueous basic solution led to the isolation of an all inorganic heterometallic aggregate Na10(OH₂)42[{Dy(H₂O)₆}₂Mn₄P₄W30O112(H₂O)₂]·17H₂O (Dy₂Mn₄-P₂W15). Single-crystal X-ray diffraction revealed that Dy₂Mn₄-P₂W15 crystallizes in the triclinic system with space group P 1 ¯ , and consists of a tetranuclear manganese(II)-substituted sandwich-type phosphotungstate [Mn₄(H₂O)₂(P₂W15O56)₂]16- (Mn₄-P₂W15), Na, and DyIII cations...
January 17, 2018: Materials
https://www.readbyqxmd.com/read/29339331/the-catalytic-destruction-of-antibiotic-tetracycline-by-sulfur-doped-manganese-oxide-s-mgo-nanoparticles
#3
Gholamreza Moussavi, Ali Mashayekh-Salehi, Kamyar Yaghmaeian, Anoshiravan Mohseni-Bandpei
The present study evaluates the efficacy of S-doped MgO (S-MgO) as compared with the plain MgO as a catalyst for destructive removal of tetracycline (TTC) in aqueous solutions. The S-MgO had around 6% S in its structure. Doping MgO with S caused increase in surface oxygen vacancy defects. Adding S-MgO (12 g/L) to a TTC aqueous solution (50 mg/L) caused removal of around 99% TTC at the neutral pH (ca. 5.1) and a short reaction time of 10 min. In comparison, plain MgO could remove only around 15% of TTC under similar experimental conditions...
January 12, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29338205/control-of-amphiphile-self-assembly-via-bioinspired-metal-ion-coordination
#4
Abigail S Knight, Josefin Larsson, Jing M Ren, Raghida Bou Zerdan, Shay Seguin, Remy Vrahas, Jianfang Liu, Gang Ren, Craig J Hawker
Inspired by marine siderophores that exhibit a morphological shift upon metal coordination, hybrid peptide-polymer conjugates that assemble into different morphologies based on the nature of the metal ion coordination have been designed. Coupling of a peptide chelator, hexahistidine, with hydrophobic oligostyrene allows a modular strategy to be established for the efficient synthesis and purification of these tunable amphiphiles (oSt(His)6). Remarkably, in the presence of different divalent transition metal ions (Mn, Co, Ni, Cu, Zn, and Cd) a variety of morphologies were observed...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29336485/a-multimodal-microcharacterisation-of-trace-element-zonation-and-crystallographic-orientation-in-natural-cassiterite-by-combining-cathodoluminescence-ebsd-epma-and-contribution-of-confocal-raman-in-sem-imaging
#5
G Wille, C Lerouge, U Schmidt
In cassiterite, tin is associated with metals (titanium, niobium, tantalum, indium, tungsten, iron, manganese, mercury). Knowledge of mineral chemistry and trace-element distribution is essential for: the understanding of ore formation, the exploration phase, the feasibility of ore treatment, and disposal/treatment of tailings after the exploitation phase. However, the availability of analytical methods make these characterisations difficult. We present a multitechnical approach to chemical and structural data that includes scanning electron microscopy (SEM)-based imaging and microanalysis techniques such as: secondary and backscattered electrons, cathodoluminescence (CL), electron probe microanalyser (EPMA), electron backscattered diffraction (EBSD) and confocal Raman-imaging integrated in a SEM (RISE)...
January 16, 2018: Journal of Microscopy
https://www.readbyqxmd.com/read/29336440/manganese-cobalt-catalyzed-oxidative-c-sp3-h-c-sp3-h-coupling-a-route-to-%C3%AE-tertiary-%C3%AE-arylethylamines
#6
Meiling Tan, Kaizhi Li, Jiangliang Yin, Jingsong You
Reported herein is an oxidative coupling reaction of an α-C(sp3)-H bond of amine with a benzylic C(sp3)-H bond through Mn or Co catalysis to provide diverse collections of α-tertiary β-arylethylamines. This protocol features an easily installed and removable coordinating activation group, a wide scope of substrates, low-cost metal catalysts, easily available starting materials and synthetic simplicity.
January 16, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29335701/a-mononuclear-manganese-iii-hydroperoxo-complex-synthesis-by-activating-dioxygen-and-reactivity-in-electrophilic-and-nucleophilic-reactions
#7
Muniyandi Sankaralingam, Yong-Min Lee, So Hyun Jeon, Mi Sook Seo, Kyung-Bin Cho, Wonwoo Nam
We report the synthesis of manganese(iii)-peroxo (MnIII(O2)) and manganese(iii)-hydroperoxo (MnIII(O2H)) complexes by activating dioxygen (O2) and the amphoteric reactivity of the Mn(iii)-hydroperoxo complex in electrophilic and nucleophilic reactions.
January 16, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29332788/turn-on-fluorescent-sensor-for-the-detection-of-glucose-using-manganese-dioxide-phenol-formaldehyde-resin-nanocomposite
#8
Zhong Feng Gao, Asmerom Yohannes Ogbe, Ei Ei Sann, Xudong Wang, Fan Xia
Monitoring blood glucose has attracted considerable attention because diabetes mellitus is a global public health problem. Herein, we reported a turn-on fluorescence detection strategy based on manganese dioxide (MnO2)-phenol formaldehyde resin (PFR) nanocomposite for rapid, sensitive, and selective detection of glucose levels in human blood. In this biosensing system, MnO2 nanoshell on the PFR nanoparticle surfaces serve as a quencher. PFR fluorescence can make a recovery in the presence of H2O2, reducing MnO2 to Mn2+...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331934/characterization-and-release-profile-of-mn-al-bearing-deposits-in-drinking-water-distribution-systems
#9
Guiwei Li, Yuanxun Ding, Hongfu Xu, Junwei Jin, Baoyou Shi
Inorganic contaminants accumulation in drinking water distribution systems (DWDS) is a great threat to water quality and safety. This work assessed the main risk factors for different water pipes and discovered the release profile of accumulated materials in a full scale distribution system frequently suffered from water discoloration problem. Physicochemical characterization of pipe deposits were performed using X-ray fluorescence, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy...
January 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/29331780/application-of-octanohydroxamic-acid-for-liquid-liquid-extraction-of-manganese-oxides-and-fabrication-of-supercapacitor-electrodes
#10
J Milne, I Zhitomirsky
MnO2 and Mn3O4 particles were prepared by wet chemical methods and efficiently dispersed and mixed with multiwalled carbon nanotubes (MWCNT) for the fabrication of composite MnO2-MWCNT and Mn3O4-MWCNT electrodes for electrochemical supercapacitors (ES). The problem of particle agglomeration was addressed by particle extraction through a liquid-liquid interface (PELLI) using octanohydroxamic acid (OHA) as a new extractor. OHA exhibited remarkable adsorption on particles due to a bidentate bonding mechanism. The use of OHA broadened the application of PELLI technology, because it allowed good extraction of particles from an aqueous phase at high pH...
January 6, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29331621/silver-ion-enhanced-particle-specific-cytotoxicity-of-silver-nanoparticles-and-effect-on-the-production-of-extracellular-secretions-of-phanerochaete-chrysosporium
#11
Zhenzhen Huang, Piao Xu, Guiqiu Chen, Guangming Zeng, Anwei Chen, Zhongxian Song, Kai He, Lei Yuan, Hui Li, Liang Hu
This study investigated the influence of silver ions (Ag+) on the cytotoxicity of silver nanoparticles (AgNPs) in Phanerochaete chrysosporium and noted the degree of extracellular secretions in response to the toxicant's stress. Oxalate production was elicited with moderate concentrations of 2,4-dichlorophenol (2,4-DCP) and AgNPs reaching a plateau at 10 mg/L and 10 μM, respectively. Increased oxalate accumulation was accompanied by higher activities of manganese peroxidase (MnP) and lignin peroxidase (LiP)...
December 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/29329705/low-cost-and-disposable-sensors-for-the-simultaneous-determination-of-coenzyme-q10-and-%C3%AE-lipoic-acid-using-manganese-iv-oxide-modified-screen-printed-graphene-electrodes
#12
Kanokwan Charoenkitamorn, Sudkate Chaiyo, Orawon Chailapakul, Weena Siangproh
In this work, for the first time, manganese (IV) oxide-modified screen-printed graphene electrodes (MnO2/SPGEs) were developed for the simultaneous electrochemical detection of coenzyme Q10 (CoQ10) and α-lipoic acid (ALA). This sensor exhibits attractive benefits such as simplicity, low production costs, and disposability. Cyclic voltammetry (CV) was used to characterize the electrochemical behavior of the analyte and investigate the capacitance and electroactive surface area of the unmodified and modified electrode surfaces...
April 3, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29329012/oxidative-transformation-kinetics-and-pathways-of-albendazole-from-reactions-with-manganese-dioxide
#13
Sin-Yi Liou, Wan-Ru Chen
Albendazole (ABZ) is a benzimidazole-based veterinary anthelmintic used extensively in the treatment of intestinal parasites. Due to its high hydrophobicity, ABZ tends to accumulate in soils and sediments in the environment. This study aims to investigate ABZ's possible degradation by manganese oxides. Minor effects from ionic strength and metal cations on ABZ degradation were observed. By contrast, decrease of pH greatly enhanced the reaction rate. Surface complexation between ABZ and MnO2 was indicated to be the dominant control in the reaction kinetics...
December 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29328060/-i-in-vivo-i-neutron-activation-analysis-of-bone-manganese-in-workers
#14
Yingzi Liu, Danelle Rolle-McFarland, Farshad Mostafaei, Yuanzhong Zhou, Yan Li, Wei Zheng, Ellen Wells, Linda Huiling Nie
Manganese (Mn) is a neurotoxicant. However, the impact of elevated, chronic Mn exposure is not well understood, partially due to the lack of a cumulative exposure biomarker. To address this gap, our group developed a compact <i>in vivo</i> neutron activation analysis (IVNAA) system to quantify Mn in bone (MnBn). In this study, we used this system and determined MnBn among male Chinese workers and compared results to their blood Mn (MnB), a measure of recent exposure, and the years of employment, a measure of cumulative exposure...
January 12, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29328033/-elemental-status-of-patients-with-various-forms-of-vitiligo
#15
N I Tsiskarishvili, A Katsitadze, N V Tsiskarishvili, I Charischarishvili
Vitiligo is a multifactorial disease in which, in each specific case of its manifestation, different mechanisms of its pathogenesis and different levels of melanin formation in the skin can be involved. Skin is one of the most metabolically active organs. Carrying out a number of vital functions (barrier, protective, respiratory, excretory, metabolic, immune, etc.), it needs microelementss. Of the 92 naturally occurring chemical elements, 81 are found in the human body. Lack of the vital elements, leads to the emergence of diseases, which are based on deficiency, excess or imbalance of micro- and macroelements in the body...
December 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29327782/development-of-manganese-enhanced-magnetic-resonance-imaging-of-the-rostral-ventrolateral-medulla-of-conscious-rats-importance-of-normalization-and-comparison-with-other-regions-of-interest
#16
Daniel J Huereca, Konstandinos A Bakoulas, Farhad Ghoddoussi, Bruce A Berkowitz, Avril Genene Holt, Patrick J Mueller
Spinally projecting neurons in the rostral ventrolateral medulla (RVLM) are believed to contribute to pathophysiological alterations in sympathetic nerve activity and the development of cardiovascular disease. The ability to identify changes in the activity of RVLM neurons in conscious animals and humans, especially longitudinally, would represent a clinically important advancement in our understanding of the contribution of the RVLM to cardiovascular disease. To this end, we describe the initial development of manganese-enhanced magnetic resonance imaging (MEMRI) for the rat RVLM...
January 12, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29327747/temperature-and-excitation-wavelength-dependent-emission-in-a-manganese-ii-complex
#17
Alexey S Berezin, Katerina A Vinogradova, Vladimir A Nadolinny, Taisiya S Sukhikh, Viktor P Krivopalov, Elena B Nikolaenkova, Mark B Bushuev
A mononuclear manganese(ii) complex with a chelating 4-(3,5-diphenyl-1H-pyrazol-1-yl)-6-(piperidin-1-yl)pyrimidine ligand (L), [MnL2Cl2]·H2O, shows intriguing excitation wavelength-dependent emission. Depending on the excitation wavelength, the complex demonstrates three emission bands with the maxima at 380 nm, 440 nm and 495 nm. The 380 nm and 440 nm emissions originate from the π → π* and n → π* ligand-centered transitions. The long-wave 495 nm emission with microsecond lifetimes is related to the d-d transitions and/or metal-to-ligand and halogen-to-ligand charge transfer...
January 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29327318/evaluation-of-water-quality-and-human-risk-assessment-due-to-heavy-metals-in-groundwater-around-muledane-area-of-vhembe-district-limpopo-province-south-africa
#18
Joshua Nosa Edokpayi, Abimbola Motunrayo Enitan, Ntwanano Mutileni, John Ogony Odiyo
Groundwater is considered as good alternative to potable water because of its low turbidity and perceived low contamination. The study assessed the physio-chemical and heavy metals concentrations in eight randomly selected boreholes water at Muledane village in Limpopo Province of South Africa and the results were compared with South African National standard permissible limit. The impacts of heavy metals on human health was further determined by performing quantitative risk assessment through ingestion and dermal adsorption of heavy metals separately for adults and children in order to estimate the magnitude of heavy metals in the borehole samples...
January 12, 2018: Chemistry Central Journal
https://www.readbyqxmd.com/read/29325187/in-vivo-evaluation-of-biodegradability-and-biocompatibility-of-fe30mn-alloy
#19
Marine Traverson, Michael Heiden, Lia A Stanciu, Eric A Nauman, Yava Jones-Hall, Gert J Breur
OBJECTIVES:  This study aims to evaluate the biodegradability and biocompatibility of an alloy of iron and manganese (Fe30Mn) in a bone model in vivo. METHODS:  Resorption of a Fe30Mn wire was compared with traditional permanent 316L stainless steel (SS) wire after bilateral transcondylar femoral implantation in 12 rats. Evaluation of biodegradation over 6 months was performed using radiography, post-mortem histology and microscopic implant surface analysis...
January 2018: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
https://www.readbyqxmd.com/read/29324899/the-effects-of-high-dose-of-two-manganese-supplements-organic-and-inorganic-on-the-rumen-microbial-ecosystem
#20
Svetlana Kišidayová, Peter Pristaš, Michaela Zimovčáková, Monika Blanár Wencelová, Lucia Homol'ová, Katarína Mihaliková, Klaudia Čobanová, Ľubomíra Grešáková, Zora Váradyová
Little is known about the effects of the high dose and types of manganese supplements on rumen environment at manganese intake level close above the limit of 150 mg/kg of dry feed matter. The effects of high dose of two manganese supplements (organic and inorganic) on rumen microbial ecosystem after four months of treatment of 18 lambs divided into three treatment groups were studied. We examined the enzyme activities (α-amylase, xylanase, and carboxymethyl cellulase), total and differential microscopic counts of rumen ciliates, total microscopic counts of bacteria, and fingerprinting pattern of the eubacterial and ciliates population analyzed by PCR-DGGE...
2018: PloS One
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