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Showing 1 to 20 of 89 for “"Mn2+"”.
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Oldalláncban pikolinátcsoportot tartalmazó makrociklusos ligandumok Gd3+-, Mn2+- és Cu2+-komplexeinek vizsgálata
… ligandum (DO3APy, DO3ACa, DODPA és Me2DODPA) Mn2+-, Cu2+- és Gd3+-ionokkal képződő komplexeinek oldategyensúlyát vizsgáltam pH-potenciometriával, UV-látható spektrofotometriával és 1H-relaxometriával. Az [Eu(DO3APy)]--, [Gd(DODPA)]+- és [Gd(Me2DODPA)]+-komplexek savkatalizált disszociációjának …
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Synthesis and potential application of Fe3+/Mn2+ bimetal and hexadecyltrimethylammonium bromide (HDTMA-Br) modified clayey soils for arsenic removal in groundwater
… adsorbents for arsenic removal using Fe3+ and Mn2+ oxides and hexadecylammonium bromide (HDTMA-Br) cationic surfactant as modifying agents. The first section of the work presented the hydrogeochemical characteristics of groundwater in the Greater Giyani Municipality. The results showed that the …
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An X- and Q-band electron paramagnetic resonance study of Mn2+ in a single crystal of NH4Cl0.9I0.1 in the temperature range 77-295 K
This work is an electron paramagnetic resonance study of the mixed ammonium chloride-iodide host crystal doped with divalent manganese. The studies presented here were carried out at X-band and Q-band microwave frequencies, and at various microwave cavity temperatures. The resonance spectrum of …
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Structural and functional studies of phosphoenolpyruvate carboxykinase
… and CO2, the second structure was an ATP, Mg2+, Mn2+, CO2 and oxaloacetate complex and, the third E. coli structure was a Lys213Ser mutant complexed with ATP, Mg2+and Mn2+. Two Anaerobiospirillum succiniciproducens PCK crystal structures were also solved; one was in the native form and the other …
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Towards low dose retrospective dosimetry on shelled species
… developed calibration curve. Characteristic Mn2+ signals were present in the EPR spectra of all studied species. Radiation induced peaks were not detected in shells of any species except terrestrial snails. A dose-response curve for terrestrial snails was developed by irradiating shells to 2, …
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Nano-imaging to Determine the Interstitial Nature of Mn(II) Doping in 2D Halide Perovskites
… 2D perovskite Cs2PbI2Cl2, we show that doping Mn2+ into the structure results in a lattice expansion. The observed lattice expansion contrasts with the predicted contraction expected to arise from the B-site metal substitution, thus implying that Mn2+ does not replace the Pb2+ sites. …
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Hydrolysis and Toxicity of Aspartyl Peptides and the Influence of Metal Ions on Aspartyl Peptide Hydrolases in Salmonella Enterica Serovar Typhimurium
… dipeptidase activity which is dependent on Mn2+. Purification of this activity followed by N-terminal sequencing of the protein suggested that the Mn2+-dependent peptidase is DapE, N-succinyl-L,L-diaminopimelate desuccinylase. Disruption of the dapE gene and transfer of the mutation into a …
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Cyanide degradation by Bacillus pumilus C1 : cellular and molecular characterization
… activity required at least 0.01 mg Mn2+ /1 in the growth medium (lower concentrations prevented the development of strong cyanide-degrading activity and also resulted in poor growth of the organism). No induction of cyanide-degrading activity occurred when Mn2+ ions were added to …
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Photochemical Formation Mechanisms and Applications of Mn Oxide Nanomaterials
… abiotic inorganic oxidation of Mn2+(aq) to δ-MnO2 nanosheets in the presence of nitrate and without a microorganism, demonstrating that abiotic Mn oxidation processes are not negligible. My doctoral work focuses on investigating the effects of various aquatic chemistry …
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Using simulation and lab validation to develop a MnCO3 Recovery Process using CO2
… leach solution containing at least 93.9 wt.% Mn2+, 2.23 wt.% Mg2+, and 0.14 wt.% Ca2+ was used. The results on the effect of pH from thermodynamic simulations were compared to experimental results. Experimental results investigated the effect of pH from 5.0 to 6.6 and CO2 bubbling times from 1 …
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Predicting Vision Loss In Healthy Aging With Manganese-Enhanced Mri Of The Rat Eye
… well as retinal physiology and eye morphology (Mn2+-enhanced MRI (MEMRI), which uses neuronal Mn2+ uptake as a marker of Ca2+ influx). We documented significant age-related decreases in visual performance and increases in retinal ion influx. We confirmed that Mn2+ uptake was regulated by L-VGCC …
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Studies of the Catalytic-Metal-Binding Site in the Hammerhead Ribozyme Using the Phosphorothioate Approach
… of a softer metal ion than Mg2+, such as Mn2+ is taken as evidence for coordination of the metal ion to the phosphorothioate sulfur and by analogy, an interaction of Mg 2+ with oxygen in the native ribozyme. UV-vis, EXAFS and 31 P NMR evidence for the interaction of Hg2+ with the …
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ESR studies of some iron(II) spin crossover complexes.
… simulations of the powder ESR spectra of Mn2+ ion in these complexes using the SimFonia simulation program, obtained from Broker, gave numerical values of D and E for Mn2+ in the [Fe(bpp)2][CF3SO 3]2·H2O and [Fe(bpp)2][BF 4]2 systems. The magnitudes of D for Mn2+ ion are very different in …
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Synthesis, physical properties and processing of multifunctional molecular materials
… the magnetic properties from that of isolated [Mn2]2+ SMMs based, have been found, may be due to interactions such as [Ni(dmit)2]n- ⋯ [Ni(dmit)2]n-, [Mn2]2+ ⋯ [Mn2]2+, [Ni(dmit)2]n- ⋯ [Mn2]2+, demonstrating the tunability of the SMM behavior by changing the combination of both SMMs and …
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Nanoscale structural/chemical characterization of manganese oxide surface layers and nanoparticles, and the associated implications for drinking water
… soluble contaminants, such as soluble manganese (Mn2+), in water by oxidation and subsequent filtration. Previous studies have shown that conventional porous filter system removes Mn2+ from drinking water by developing Mn-oxides (MnOx(s)) bearing coating layers on the surface of filter media. …
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Diluted Magnetic Semiconductor Nanomaterials Fabrication by a Chemical Vapor Deposition Method
… obtained. At high reaction temperature 950ºC, Mn2+ were substitutionally doped into ZnO lattice, resulting in room-temperature ferromagnetic coupling with a saturated magnetization of 0.25emu/g. The ferromagnetic interaction is weakened, however, by larger concentration of Mn, due to the …
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Synthetic investigation of Mn(I) and Re(I) N-heterocyclic carbene complexes
… substrates Re(CO)5Br, Mn(CO)5Br, Re2(CO)10 and Mn2(CO)10. Isolation and purification of these products proved to be very challenging due to the insolubility in some organic solvents with consequent problematic spectroscopic analyses of the complexes. The tendency of the products to undergo …
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Physiological response of Rhizobium leguminosarum during bacteroid development
… of functional redundancy was seen between the Mn2+ transporters SitABCD and MntH. Single mutations in sitA or mntH did not cause a symbiotic phenotype whereas the double mutant could not form bacteroids on P. sativum, V. faba or V. hirsuta. Intriguingly, no symbiotic phenotype for the double …
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Iron and Manganese Homeostasis in Marine Bacteria
… corresponding to sitABCD, an effective ABC‐type Mn2+ transporter in many other bacteria. This was confirmed, directly, to be the case for Ruegeria. Bioinformatic analyses showed that some other Roseobacter strains lacked any previously known Mn2+ transporter, but instead, had a gene that likely …
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