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Electron transfer and oxygen

Nickel(IV) complexes react with dimethyl sulphoxide in acidic solution to give the sulphone and nickel(II) ions. The kinetics of this reaction have been studied and found to be very complex in nature. The reaction probably proceeds by initial complexation of the dimethyl sulphoxide to the nickel(IV) species followed by electron transfer and oxygen atom transfer producing the observed products149. [Pg.985]

B.C. King and F.M. Hawkridge, A study of the electron transfer and oxygen binding reactions of myoglobin. J. Electroanal. Chem. 237, 81-92 (1987). [Pg.597]

Iron is an essential cofactor of numerous enzymes, involved in, for instance, electron transfer and oxygen metabolism. It seems counterintuitive that the fourth most abundant element in the biosphere is in many instances the least bioavailable bioelement and therefore the limiting growth factor. The reason for this lies in the extremely low solubility of ferric iron (Fe3+) the prevailing form of iron under oxic conditions. Iron is precipitated as Fe(OH)3 with a solubility product of 10 39, which limits the aqueous concentration of ferric ion... [Pg.430]

The essential difference between nicotinamide and flavin is in the nature of the acceptor site, i.e., CH for nicotinamide as compared with N for flavoquinone. This explains why 5-deazaflavins appear to be interesting flavin (anti)metabolites since they are expected to be functional analogs of nicotinamide, exhibiting at the same time the steric shape of a flavin. Indeed it turns out that incorporation of 5-deazaflavin into apo-flavoproteins blocks the electron transfer and oxygen activation properties (32,33,34,35,36). Retaining at least partially the (de) hydro-... [Pg.323]

Both mechanisms of oxidation of the manganese-oxo porphyrin, electron transfer and oxygen atom transfer were observed on the same DNA target. [Pg.119]

Morris ND, Suzuki M, Mallouk TE (2004) Kinetics of electron transfer and oxygen evolution in the reaction of Piu(bpy)3] with colloidal iridium oxide. J Phys Chem A... [Pg.145]

Mimicking Biological Electron Transfer and Oxygen Activation Involving Iron and Copper Proteins A Bio(in)organic Supramolecular Approach... [Pg.314]

Transition elements have some biological functions for chemistry of living systems. Metals, such as iron, cobalt, copper, and molybdenum have functions in living systems, whereas protein contains iron, which helps in electron transfer and oxygen transport. Most transition metal elements plays similar major roles in various biological living systems and for these reasons we focused on the transition metals. [Pg.466]

Mamuru SA, Ozoemena KI (2010) Heterogeneous electron transfer and oxygen reduction reaction at nanostructured Iron(n) phthalocyanine and its MWCNTs nanocomposites. Electroanalysis 22(9) 985-994... [Pg.206]

Yun et al. [452] analyzed the kinetics of the catalytic cycle of P450 2A6 with conmarins and conclnded that substrate binding, prodnct release, electron transfer, and oxygen binding were all rapid steps and that C-H bond cleavage is probably mainly rate limiting. [Pg.565]

Figure 10. Proton inventory of cytochrome P450cam second electron transfer and oxygen activation. Rates were normalized relative to the rates of second electron transfer through product release measured in H2O. All data points represent at least three independent determinations of stopped-flow spectrophotometric experiments between dioxygen complexed P450cam (2 iM) and reduced Pd (20 pM) with 2.5 mM metyrapone to stop reactions following single turnover. Reactions were maintained at 8T in D2O/ H2O buffer mixtures listed as mole fraction D2O (n). Data taken from [101]. Figure 10. Proton inventory of cytochrome P450cam second electron transfer and oxygen activation. Rates were normalized relative to the rates of second electron transfer through product release measured in H2O. All data points represent at least three independent determinations of stopped-flow spectrophotometric experiments between dioxygen complexed P450cam (2 iM) and reduced Pd (20 pM) with 2.5 mM metyrapone to stop reactions following single turnover. Reactions were maintained at 8T in D2O/ H2O buffer mixtures listed as mole fraction D2O (n). Data taken from [101].

See other pages where Electron transfer and oxygen is mentioned: [Pg.269]    [Pg.418]    [Pg.715]    [Pg.715]    [Pg.238]    [Pg.61]    [Pg.179]    [Pg.247]    [Pg.129]    [Pg.201]   
See also in sourсe #XX -- [ Pg.31 ]




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