منابع مشابه
The Molybdenum Site of Nitrogenase. 2. A Comparative Study of Mo-Fe Proteins and the Iron-Molybdenum Cofactor by X-Ray Absorption Spectroscopy
Recently, the Mo environment in lyophilized MoFe protein from Closfridiuni pasteurianum has been structurally characterized by x-ray absorption spectroscopy measurements. As a further step in elucidating the structure and relationship of the Mo environment in other species, the MoFe component from Azotobacter cinelandii has been studied. The K-edge M o x-ray absorption spectra for the intact cr...
متن کاملInterdiffusion of Refractory Elements in Fe-Cr-X (X-Mo, W) and Fe-Mo-W Ternary Iron Alloys
Interdiffusion coefficients of the refractory elements in Fe-Cr-X (X 1⁄4 Mo, W) and Fe-Mo-W ternary alloys were measured on the basis of the modified Boltzmann-Matano method for ternary systems. The cross interdiffusion coefficient, ~ D CrW was positive in Fe-Cr-W ternary alloy, indicating that W accelerates interdiffusion between Fe and Cr atoms. On the other hand, the cross interdiffusion coe...
متن کاملIron EXAFS of Azotobacter vinelandii Nitrogenase Mo-Fe and V-Fe Proteins
The structure of the iron sites of nitrogenase in dithionite-reduced and thionine-oxidized forms of the Mo-Fe and V-Fe proteins has been investigated using Fe K-edge X-ray absorption spectroscopy. For the dithionite-reduced Azotobacter uinelandii Mo-Fe protein, the dominant EXAFS Fourier transform peaks are assigned to F e 4 and Fe-Fe interactions at -2.32 and 2.64 A, as expected for F e S clus...
متن کاملStructural Comparison of Iron Tetrapolyvanadate Fe(2)V(4)O(13) and Iron Polyvanadomolybdate Fe(2)V(3.16)Mo(0.84)O(13.42): A New Substitution Mechanism of Molybdenum(VI) for Vanadium(V).
Single crystals of the iron tetrapolyvanadate Fe(2)V(4)O(13) and the iron polyvanadomolybdate Fe(2)V(3.16)Mo(0.84)O(13.42) were grown from Fe(2)O(3)/V(2)O(5) and Fe(2)O(3)/V(2)O(5)/MoO(3) melts, respectively. Single-crystal X-ray diffraction revealed that the two structures are closely related. Both contained isolated Fe(2)O(10) octahedral dimers with similar orientations. The unusual U-shaped ...
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ژورنال
عنوان ژورنال: Journal of Phase Equilibria and Diffusion
سال: 2011
ISSN: 1547-7037,1863-7345
DOI: 10.1007/s11669-011-9891-0