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Manganese Compounds (1):
Recent article
Manganese Compounds
Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances & Environmental Engineering (45)13 2010
Abstract
Removing soluble manganese from groundwater requires a strong chemical oxidant, such as ozone or potassium permanganate, or raising the pH to alkaline value (over pH 9). Biological or adsorption processes can also be applied. Filter media naturally or industrially coated with manganese oxide are eff...
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PMID: 20924918
PDF is available here.
PDF is available here.
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Abstract
Airborne metal-containing particles represent a known source of health risk but the role of nano-sized particles in the pathogenicity of dust has been recognized only recently. As a model of inhalational exposure to manganese, adult male Wistar rats were treated with a suspension of MnO(2) nanoparti...
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PMID: 20863568
PDF is available here.
PDF is available here.
Abstract
Ozonation of 2,4-dichlorophenol (DCP) in the presence of permanganate has been investigated at various levels of pH. Compared with only 40% in single ozonation, by catalytic ozonation the total organic carbon removal efficiency reached almost 95%. It has been shown that the addition of 0.5 mg L(-1)...
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PMID: 21046960
PDF is available here.
PDF is available here.
Journal of Contaminant Hydrology (117)1-4 2010
Abstract
The effectiveness of permanganate for in situ chemical oxidation of organic liquid (trichloroethene) trapped in lower-permeability (K) zones located within a higher-permeability matrix was examined in a series of flow-cell experiments. The permanganate solution was applied in both continuous and pul...
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PMID: 20685008
PDF is available here.
PDF is available here.
Neuroscience Letters (481)2 2010
Abstract
We report on experiments to evaluate whether visual stimulation can permit manganese transport onwards from the olfactory bulb to the visual cortex. Rats in intact olfactory bulb group were reserved intact olfactory bulb, while those in olfactory bulbectomy group received bilateral bulbectomy. After...
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PMID: 20600598
PDF is available here.
PDF is available here.
Nanotechnology (21)29 2010
Abstract
We attribute to the size-selective sieving effect of CNTs. By controlling the terminating point for the flow of QDs across the CNT array, a QD size specific CNT/QD hybrid structure is achieved....
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PMID: 20585170
PDF is available here.
PDF is available here.
Abstract
The potential-pH response of an electrolytic manganese dioxide is investigated by means of a cavity microelectrode (CME). The potential-pH curves show a complex evolution that could be explained by the disporportionation of MnOOH species, leading to the formation of Mn(2+) ions on the MnO(2) surface...
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PMID: 20602935
PDF is available here.
PDF is available here.
Abstract
Halogenated VOCs emissions are associated to a wide range of industrial processes; for instance, dichloroethane (DCEA) is mainly used in metal degreasing processes and known to be hazardous to the environment and public health. The effects of operating parameters on the catalytic incineration of DCE...
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PMID: 20227177
PDF is available here.
PDF is available here.
Abstract
A novel manganese complex Mn(2)(DAT)(2)Cl(4)(H(2)O)(4), where DAT is 1,5-diaminotetrazole, was synthesized by the reaction of manganese(II) chloride tetrahydrate and 1,5-diaminotetrazole (DAT) in ethanol, and characterized by elemental analysis, FT-IR spectroscopy. The crystal structure was determin...
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PMID: 20338686
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (178)1-3 2010
Abstract
The activated carbon-MnO(2) catalyst has been prepared by the dipping-calcination method with activated carbon used as a carrier. The catalyst is used for catalyzing/degrading simulated o-chlorophenol wastewater with chlorine dioxide as oxidant. The COD removal efficiency by catalytic oxidation is 9...
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PMID: 20149526
PDF is available here.
PDF is available here.
Abstract
Our data demonstrate that Ni(II) sorbs at vacant sites in the interlayer of the BioMnO(x) and the maximum Ni(II) sorption capacity increases as the formation pH of BioMnO(x) decreases. This relation indicates that the quantity of BioMnO(x) vacant sites increases as formation conditions become more a...
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PMID: 20469849
PDF is available here.
PDF is available here.
Abstract
Biologically catalyzed Mn(II) oxidation produces biogenic Mn-oxides (BioMnO(x)) and may serve as one of the major formation pathways for layered Mn-oxides in soils and sediments. The structure of Mn octahedral layers in layered Mn-oxides controls its metal sequestration properties, photochemistry, o...
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PMID: 20469850
PDF is available here.
PDF is available here.
Abstract
Lincosamides are among the most frequently detected antibacterial agents in effluents from wastewater treatment plants and surface runoff at agricultural production systems. Little is known about their transformations in the environment. This study revealed that manganese oxide caused rapid and exte...
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PMID: 20476766
PDF is available here.
PDF is available here.
Abstract
We previously demonstrated that several ligands such as phosphate, pyrophosphate, EDTA, and humic acid could significantly enhance permanganate oxidation of triclosan (one phenolic biocide), which was explained by the contribution of ligand-stabilized reactive manganese intermediates in situ formed...
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PMID: 20429549
PDF is available here.
PDF is available here.
Abstract
The red photoluminescence of Mn dopants in MnS-CdS heteronanostructures has been observed for the first time. The red photoluminescence at 650 nm derives from emission due to the (4)T(1) --> (6)A(1) transition of Mn(2+) dopants in a CdS matrix exposed to gigapascal-level lattice stress. HRTEM, FFT,...
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PMID: 20426408
PDF is available here.
PDF is available here.
Abstract
The oxidation of arsenite (As(III)) via Mn-oxides is an important process for natural arsenic (As) cycling and for developing in situ strategies for remediation of As-contaminated waters. In this study, the influence of goethite (alpha-FeOOH), phosphate, and bacteria/biopolymer coatings on the initi...
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PMID: 20402521
PDF is available here.
PDF is available here.
Experimental Parasitology (125)2 2010
Abstract
In Leishmania, arginase is responsible for the production of ornithine, a precursor of polyamines required for proliferation of the parasite. In this work, the activation kinetics of immobilized arginase enzyme from L. (L.) amazonensis were studied by varying the concentration of Mn2+ applied to the...
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PMID: 20109449
PDF is available here.
PDF is available here.
Abstract
We report the synergistic effect between a 2-aminoimidazole/triazole conjugate and antibiotics toward dispersing preestablished biofilms, culminating with a 3-orders-of-magnitude increase of biofilm dispersion toward Staphylococcus aureus biofilms. Furthermore, we document that the 2-aminoimidazole/...
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PMID: 20211901
PDF is available here.
PDF is available here.
Toxicological Sciences (115)1 2010
Abstract
We observed that Mn concentrations in the Mn-treated group were highest in the striatum, consistent with a statistically significant decrease in mitochondrial viability and [(3)H]glutamate uptake, and increased lipid peroxidation. Mn levels in the hippocampus and cortex were indistinguishable from c...
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PMID: 20133376
PDF is available here.
PDF is available here.
Biomaterials (31)13 2010
Abstract
We report here a thermal decomposition approach to the synthesis of water-soluble superparamagnetic manganese ferrite (MnFe(2)O(4)) nanoparticles (NPs) for magnetic resonance (MR) imaging applications. In this approach, tetraethylene glycol was utilized as a coordination and stabilization agent, ren...
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PMID: 20144480
PDF is available here.
PDF is available here.
Inorganic Chemistry (49)7 2010
Abstract
We report the synthesis of two pyridine-containing ligands L1 and L2, with 15-membered triaza-dioxa-crown and pentaaza-crown ether macrocycles, respectively, and the characterization of their Mn(2+) complexes. Protonation constants of the ligands and stability constants of various metal complexes we...
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PMID: 20180546
PDF is available here.
PDF is available here.
Abstract
Headspace single-drop microextraction has been investigated for the determination of chloride in conjunction with fibre optic-based cuvetteless micro-spectrophotometry which accommodates sample volume of 1 microL placed between the two ends of optical fibres. Method has been evolved for the determin...
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PMID: 20152416
PDF is available here.
PDF is available here.
Abstract
Toxicology In Vitro (24)2 2010
Abstract
Manganese, an essential trace nutrient in human beings, has been widely used in the steel industry to improve hardness, stiffness, and strength. With the increased applications of manganese compounds, discharge into the environment has rapidly increased and may exert adverse effects on human health....
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PMID: 19815061
PDF is available here.
PDF is available here.
Abstract
The degrees of elimination of gastroduodenal fluid of MCT and FAC were significantly better than those without an agent (P < 0.01 and P < 0.01). The subjective image quality of MCT of the overall and extrahepatic bile duct were significantly better, although no significant differences for FAC were o...
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PMID: 20182846
PDF is available here.
PDF is available here.
Abstract
We report a previously undescribed bacterial behavior termed electrokinesis. This behavior was initially observed as a dramatic increase in cell swimming speed during reduction of solid MnO(2) particles by the dissimilatory metal-reducing bacterium Shewanella oneidensis MR-1. The same behavioral res...
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PMID: 20018675
PDF is available here.
PDF is available here.
Operative Dentistry (35)3 2010
Abstract
The Analysis of Variance and Tukey tests (alpha = 5%) showed statistically significant differences for the shade perception values (p = 0.002). Groups GM, CM and RA showed significantly higher means than the control group. CONCLUSION: The presence of some chemical activators is capable of resulting...
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PMID: 20533628
PDF is available here.
PDF is available here.
Abstract
An activated carbon-MnO(2) catalyst was prepared by the dipping-calcination method using activated carbon as catalyst support. The catalyst was used for the catalytic oxidation of simulated acid chrome blue K wastewater. The COD removal efficiency and decolor efficiency by catalytic oxidation are 72...
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PMID: 20388989
PDF is available here.
PDF is available here.
Abstract
MnO(2) nanorods were prepared by the reaction of KMnO(4) and MnSO(4) in aqueous media and subsequently followed by hydrothermal methods. The structure and surface morphology of as-prepared powder were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results indica...
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PMID: 20388996
PDF is available here.
PDF is available here.
Abstract
We were able to monitor the particle movement and retention by MRI. Thus, the new material combines the MRI contrast enhancement capability with targeted hyperthermia treatment....
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PMID: 19127514
PDF is available here.
PDF is available here.
Abstract
The preparation and electrochemical characterization of a carbon paste electrode modified with layered birnessite-type manganese oxide for use as a sodium sensor is described. The effects of powder synthesis process (sol-gel and redox precipitation) for birnessite on the electrochemical activity of...
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PMID: 19836514
PDF is available here.
PDF is available here.
Parasitology (85 (Pt 3))03 2009
Abstract
Activation of prophenol oxidase of Fasciola gigantica has been demonstrated using biochemical and electrophoretic techniques. Based on the difference in the electrophoretic pattern of the proenzyme and activated enzyme, a probable mechanism of activation of the prophenol oxidase is suggested. A role...
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PMID: 6817288
PDF is available here.
PDF is available here.
Abstract
A controlled-release technique using potassium permanganate (KMnO4) has been recently developed as a long-term and semi-passive remediation scheme for dilute groundwater plumes of chlorinated solvents such as trichloroethylene (TCE) and perchloroethylene. Batch experiments were performed to evaluate...
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PMID: 20088197
PDF is available here.
PDF is available here.
Abstract
We investigated phantoms to control both the diffusion coefficient and the T2-value by changing the concentration of gelatin or sucrose and MnCl(2), respectively. The results showed that the diffusion coefficient decreased linearly with increases in the gelatin or sucrose concentration, and decreasi...
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PMID: 20019428
PDF is available here.
PDF is available here.
Abstract
These results strongly suggest a direct role of the Mn-oxides on the occurrence of Cr(VI) through a redox reaction between Cr(III) and Mn(IV) and/or Mn(III). Owing to the much larger toxicity and solubility of Cr(VI), such a co-occurrence of Cr and Mn-oxides in these soils could then represent an im...
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PMID: 19848150
PDF is available here.
PDF is available here.
Extremophiles (14)1 2010
Abstract
A possibility of dissimilatory MnO(2) reduction at extremely high salt and pH was studied in sediments from hypersaline alkaline lakes in Kulunda Steppe (Altai, Russia). Experiments with anaerobic sediment slurries demonstrated a relatively rapid reduction of colloidal MnO(2) in the...
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PMID: 19779762
PDF is available here.
PDF is available here.
Inorganic Chemistry (48)18 2009
Abstract
A new glycine-templated manganese(II) sulfate, (C(2)NO(2)H(5))MnSO(4) (1), has been solvothermally synthesized and characterized crystallographically and magnetically. Crystal data for 1: monoclinic, space group P2(1)/m, a = 4.8884(10) A, b = 7.8676(14) A, c = 8.0252(15) A, beta = 106.524(2) degrees...
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PMID: 19697941
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (168)2-3 2009
Abstract
A simple method is proposed for testing the reactivity of elemental iron materials (Fe(0) materials) using methylene blue (MB) as reagent. The method is based on the oxidative reactivity of Fe(II) for reductive dissolution of MnO(2). Fe(II) is produced in-situ by the oxidation of a Fe(0) material. T...
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PMID: 19329252
PDF is available here.
PDF is available here.
Abstract
These results suggest that birnessite acts as a catalyst through the oxidation of iodide to iodine and the polarization of the iodine molecule, which then reacts with NOM moieties. Furthermore, our results indicate that during water treatment in the presence of manganese oxide, iodinated organic com...
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PMID: 19806734
PDF is available here.
PDF is available here.
Abstract
The cathodic electrophoretic deposition (EPD) method has been developed for the deposition of composite manganese dioxide-multiwalled carbon nanotube (MWCNT) films. Dopamine (DA) was shown to be an effective charging additive, which provides stabilization of manganese dioxide nanoparticles and MWCNT...
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PMID: 19449813
PDF is available here.
PDF is available here.
Abstract
We conclude that structuralincorporation of Mn(II) into uraninite has an important stabilizing effect leading to the prediction that other groundwater solutes may similarly stabilize biogenic uraninite....
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PMID: 19764214
PDF is available here.
PDF is available here.
Abstract
We propose that As(V) adsorption inhibits As(III) oxidation by blocking adsorption sites. Under simulated acidic pH conditions, Mn(IV) sites exhibited stronger adsorption affinity than Mn(III) sites for both As(III) and As(V). Overall, we hypothesize that Mn(III) sites are less reactive in terms of...
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PMID: 19764231
PDF is available here.
PDF is available here.
Environmental Science (30)8 2009
Abstract
The oxidative transformation of 17beta-estradiol (E2) by the delta-MnO2 was investigated in batch experiments, and the influence of pH and delta-MnO2 dosage on the reaction process was studied. The results suggested that E2 could be degraded by delta-MnO2, and the oxidation reaction deviated from th...
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PMID: 19799286
PDF is available here.
PDF is available here.
Environmental Science (30)8 2009
Abstract
MnOx-CeOx/ACF catalyst was prepared by impregnation method, which exhibited high activity for low-temperature selective catalytic reduction of NOx over the temperature range 110-230 degrees C. Experiments results indicated that the catalyst yielded 80% NO conversion at 150 degrees C and 90% at 230 d...
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PMID: 19799275
PDF is available here.
PDF is available here.
Environmental Science (30)8 2009
Abstract
The degradation of PCB77 in diatomite by microwave-induced catalytic oxidation was studied in a sealed vial, including four effects such as microwave (MV) radiating time, addition of different nano-particle metal oxides, concentration and type of acids and dosage of MnO2. The results indicated that...
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PMID: 19799308
PDF is available here.
PDF is available here.
Abstract
17beta-Estradiol (E2) is known as a natural endocrine disruptor and often found in municipal sewage. Batch experiments were conducted to assess the oxidative transformation of E2 in aqueous solutions by MnO2 and the probable degradation pathway. The results suggested that E2 could be degraded by MnO...
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PMID: 19002738
PDF is available here.
PDF is available here.
Abstract
We have determined that the Pol II associated with the promoters of many genes has initiated transcription but paused in the region 20-50 nucleotides from the start. Here we describe the application of this method in Drosophila and human cells. The method should prove useful in assessing if promoter...
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PMID: 19272453
PDF is available here.
PDF is available here.
Neurotoxicity Research (16)1 2009
Abstract
We demonstrated that MnCl(2) can activate microglia, and that this can cause dopaminergic neuronal injury. Investigation of the underlying mechanisms showed that inducible nitric oxide synthase (iNOS), tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta) was induced and highly expre...
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PMID: 19526297
PDF is available here.
PDF is available here.
Abstract
We used fluorescent microscopy and the Ca(2+)-sensitive dye, fura 2, to measure basal intracellular Ca(2+) concentration ([Ca(2+)](i)), store-operated Ca(2+) entry (SOCE), and increases in [Ca(2+)](i) caused by acute hypoxia (4% O(2)) or depolarization (60 mmol/l KCl) in cells treated with small int...
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PMID: 19395668
PDF is available here.
PDF is available here.
Abstract
We measure changes in adhesion when a patchy overgrowth of manganese oxide nanostructures forms on the surface of rhodochrosite. For the most part, the observations show that the adhesive force to the nanostructures is dominated by van-der-Waals attraction. Measurements made across an area of the su...
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PMID: 19673293
PDF is available here.
PDF is available here.
Abstract
This work aimed to analyze the possibility and performance of the temperature controlled hyperthermia based on AC heating of magnetic nanoparticles with low Curie temperature. Temperature dependence of dynamic magnetic susceptibility has been studied experimentally on fine powders of La(0.8)Ag(0.15)...
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PMID: 19437239
PDF is available here.
PDF is available here.
Abstract
A novel and convenient immunosensor, based on the electrostatic adsorption characteristics between the positively charged MnO(2) nanoparticles (nano-MnO(2)) and chitosan (CS) composite membrane (nano-MnO(2) + CS) and the negatively charged prussian blue (PB), was prepared for the detection of carcin...
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PMID: 18923847
PDF is available here.
PDF is available here.
Abstract
We investigated a potential molecular mechanism underlying manganese-induced pulmonary inflammation. Manganese (II) delayed HIF-1alpha protein disappearance, which occurred by inhibiting HIF-prolyl hydroxylase (HPH), the key enzyme for HIF-1alpha hydroxylation and subsequent von Hippel-Lindau(VHL)-d...
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PMID: 19263519
PDF is available here.
PDF is available here.
Nanotechnology (20)10 2009
Abstract
Hydrohausmannite nanoparticles (approximately 10 nm) were prepared by the hydrothermal method at 100 degrees C for 72 h. Subsequent annealing was done in air at 400 degrees C and 800 degrees C for 10 h, Mn(3)O(4) nanoparticles (approximately 25 nm) and 3D Mn(2)O(3) porous networks were obtained, res...
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PMID: 19417534
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (162)2-3 2009
Abstract
Catalysts based on MnOx/TiO2 were prepared by sol–gel, impregnation, and coprecipitation methods for low-temperature selective catalytic reduction (SCR) of NO with NH3. Among the catalysts, the sample prepared by sol–gel method had the best performance on both activity and SO2 resistance. From th...
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PMID: 18650000
PDF is available here.
PDF is available here.
Journal of Hazardous Materials (162)2-3 2009
Abstract
An active catalyst, MnO(2)/Al(2)O(3), was prepared by a novel technique as well as wet impregnation method. Total oxidation of chlorinated aromatics on supported manganese oxide catalysts was investigated. It is seen that MnO(2) supported on Al(2)O(3) is an effective catalyst for the oxidative destr...
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PMID: 18603366
PDF is available here.
PDF is available here.
FEMS Microbiology Letters (292)2 2009
Abstract
We show that magnetite crystals produced by uncultured magnetotactic bacteria can incorporate manganese up to 2.8 atom% of the total metal content (Fe+Mn) when manganese chloride is added to microcosms. Thus, chemical purity can no longer be taken as a strict prerequisite to consider magnetite cryst...
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PMID: 19187208
PDF is available here.
PDF is available here.
Abstract
We find that anions (Br(-), Cl(-) and NO(3)(-)) in the form of sodium salts are strong inhibitors for the CTAB catalyzed oxidation. Kinetic and spectrophotometric evidences for the formation of an intermediate complex and an ion-pair complex between phe and MnO(4)(-), CTAB and MnO(4)(-), respectivel...
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PMID: 19131220
PDF is available here.
PDF is available here.
Abstract
Superoxide is unreactive in deionized water, but aqueous systems containing added solvents, including H2O2 at >100 mM, show significantly increased reactivity of superoxide with oxidized organic compounds such as highly chlorinated aliphatics. The potential for solid surfaces to similarly increase t...
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PMID: 19350930
PDF is available here.
PDF is available here.
Environmental Science (30)2 2009
Abstract
Manganese (Mn) oxides are common minerals in natural environments that may play an important role in the biogeochemical cycles of heavy metals. Increasing evidences have shown that Mn (II) oxidation is a microbially-mediated process, and the Mn oxidizing microorganisms are thus recognized as the maj...
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PMID: 19402518
PDF is available here.
PDF is available here.