Manganese Chloride
Mostrando 13-24 de 40 artigos, teses e dissertações.
-
13. Síntese, caracterização e atividade catalítica de novos catalisadores metaloporfirínicos suportados / Synthesis, characterization and catalytic activity of novel anchored metalloporphyrin catalysts
In this work the second generation metalloporphyrin Me(TFPP)Cl (Me = Fe and Mn) [5,10, 15, 20 ? tetrakis(pentafluorophenyl) porphyrin iron (III) or manganese (III) chloride] was covalently anchored to aminofunctionalyzed supports, through nucleophilic substituition of the para-fluorine atoms of the pentafluorophenyl meso-aryl groups, with the objective of ob
Publicado em: 2004
-
14. "Caracterização eletroquímica e imobilização de metaloporfirinas em filmes de pirrol eletropolimerizados: preparação e aplicação". / Electrochemical characterization and immobilization of metalloporphyrins on electropolymerized pyrrole films: prepartion and application
This work describes the preparation and characterization of metalloporphyrin-modified electrodes and their application in the reduction or/and oxidation of organic compounds. The studied metalloporphyrins were 5,10,15,20-tetrakis(4-methylpyridyl) porphyrinmanganese(III)hexafluorophosphate, [Mn(T4MPyP)](PF6)5, and 5,10,15,20-tetrakis(2-aminophenyl)porphyr
Publicado em: 2003
-
15. Synthesis and characterization of manganese-glycine and copper-glycine adducts
This work reports the synthesis and characterization of adducts of general formula MCl2.ngly, where M= Mn and Cu; n= 2 and 4, and gly= glycine. The manganese adducts were synthesized by dissolution of both, manganese chloride and glycine in water, whereas the copper adducts were obtained by using an alternative solid state synthesis approach. For all adducts
Química Nova. Publicado em: 2002-09
-
16. Estudo da degradação de polimeros sinteticos de importancia industrial por linhagens fungicas
This work describes the action of basidiomycetes fungi on the degradability of the four main synthetic polymers used in food packaging: polyethylene terephthalate (PET), polypropylene (PP), polystyrene (PS), polyvinyl chloride (PVC) and another synthetic polymer, a polyurethane foam (PU). The microorganisms were grown in the salts liquid medium, pH 6.8, cont
Publicado em: 2001
-
17. Compostos de coordenação de dimorfolino cloro-fosfinoxido com alguns metais de transição bivalentes
Coordination compounds were prepared by the reaction between chlorides, nitrates and perchlorides of some bivalent transition metals of the first row of transition elements with chlore-dimorpholinephosphine oxide in methanolic solution. The compounds so obtained were caracterized by means of elementar analysis, infrared spectra, far infrared and visible spec
Publicado em: 1977
-
18. Observations and comments on the mechanism of epoxidation of alkenes by manganese(III) porphyrins with hypochlorite.
The kinetics of olefin epoxidation in a methylene chloride/water biphase containing a phase-transfer agent with hypochlorite as oxygen transfer reagent and manganese(III) tetraphenylporphyrin catalysts has been reinvestigated. The results do not support the accumulation of an intermediate composed of an alkene and a hypervalent metaloxo porphyrin. Second-ord
-
19. Manganese binding and oxidation by spores of a marine bacillus.
Mature, dormant spores of a marine bacillus, SG-1, bound and oxidized (precipitated) manganese on their surfaces. The binding and oxidation occurred under dormant conditions, with mature spores suspended in natural seawater. These heat-stable spores were formed in the absence of added manganese in the growth medium. The rate and amount of manganese bound by
-
20. Protection against endotoxin-induced mortality in mice treated with transition metal salts.
Administration of manganese or chromium chloride 1 h before challenge with a single bolus of Salmonella typhosa endotoxin completely obviated death in endotoxin-challenged mice.
-
21. Effects of barium, lanthanum and gadolinium on endogenous chloride and potassium currents in Xenopus oocytes.
1. The effects of multivalent cations on membrane currents recorded from Xenopus oocytes were studied. 2. The hyperpolarization-activated chloride current was reversibly blocked by lanthanum; half-maximal block occurred at a concentration of 8 microM. Zinc, cadmium, cobalt and nickel were less potent than lanthanum, and gadolinium, manganese, barium and stro
-
22. Relevance of the reaction of a manganese(III) chelate with hydroxide ion to photosynthesis: Reaction of hydroxide ion with 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)porphinatomanganese(III) in ligating and nonligating solvents
The reaction of HO- with 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)porphinatomanganese(III) chloride [(TMP)MnIII(Cl)] in ligating solvents (CH3CN, dimethyl sulfoxide, pyridine) results in formation of (TMP)MnII (≈106 M-1·s-r), which in a slower reaction is converted to a product whose structure is suggested to be that of a porphyrin manganese(III) peroxo
-
23. Lectin-enhanced accumulation of manganese-limited Rhizobium leguminosarum cells on pea root hair tips.
The ability of Rhizobium leguminosarum 248 to attach to developing Pisum sativum root hairs was investigated during various phases of bacterial growth in yeast extract-mannitol medium. Direct cell counting revealed that growth of the rhizobia transiently stopped three successive times during batch culture in yeast extract-mannitol medium. These interruptions
-
24. The PsbY Protein Is Not Essential for Oxygenic Photosynthesis in the Cyanobacterium Synechocystis sp. PCC 68031
A tetra-manganese cluster in the photosystem II (PSII) pigment-protein complex plays a critical role in the photosynthetic oxygen evolution process. PsbY, a small membrane-spanning polypeptide, has recently been suggested to provide a ligand for manganese in PSII (A.E. Gau, H.H. Thole, A. Sokolenko, L. Altschmied, R.G. Herrmann, E.K. Pistorius [1998] Mol Gen
American Society of Plant Physiologists.