Interaction mechanisms of bacterial strains isolated from extreme habitats with uranium

2006 ◽  
Vol 94 (9-11) ◽  
Author(s):  
Mohamed Merroun ◽  
M. Nedelkova ◽  
Andre Rossberg ◽  
C. Hennig ◽  
Sonja Selenska-Pobell
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cellular Localization ◽  
Bacterial Strains ◽  
X Ray ◽  
Deep Well ◽  
Transmission Electron ◽  
Microbiological Methods ◽  
Extreme Habitats ◽  
X Ray Absorption

This paper summarizes the effect of pH on the speciation and cellular localization of uranium bound by bacterial strains isolated from the S15 deep-well montoring site, located at the Siberian radioactive subsurface depository Tomsk-7, Russia. Microbiological methods in combination with extended X-ray absorption fine structure (EXAFS) spectroscopy, transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX) were applied. EXAFS analysis showed that the cells of the two isolates,

Structural, morphological, and magnetic study of nanocrystalline cobalt-copper powders synthesized by the polyol process

1995 ◽  
Vol 10 (6) ◽  
pp. 1546-1554 ◽  
Author(s):  
G.M. Chow ◽  
L.K. Kurihara ◽  
K.M. Kemner ◽  
P.E. Schoen ◽  
W.T. Elam ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Copper Powders ◽  
Face Centered ◽  
Increasing Temperature ◽  
X Ray Absorption

Nanocrystalline CoxCu100−x (4 ⋚ x ⋚ 49 at. %) powders were prepared by the reduction of metal acetates in a polyol. The structure of powders was characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), extended x-ray absorption fine structure (EXAFS) spectroscopy, solid-state nuclear magnetic resonance (NMR) spectroscopy, and vibrating sample magnetometry (VSM). As-synthesized powders were composites consisting of nanoscale crystallites of face-centered cubic (fcc) Cu and metastable face-centered cubic (fcc) Co. Complementary results of XRD, HRTEM, EXAFS, NMR, and VSM confirmed that there was no metastable alloying between Co and Cu. The NMR data also revealed that there was some hexagonal-closed-packed (hcp) Co in the samples. The powders were agglomerated, and consisted of aggregates of nanoscale crystallites of Co and Cu. Upon annealing, the powders with low Co contents showed an increase in both saturation magnetization and coercivity with increasing temperature. The results suggested that during preparation the nucleation of Cu occurred first, and the Cu crystallites served as nuclei for the formation of Co.

scholarly journals The crystallization of MgO–Al2O3–SiO2–ZrO2glass-ceramics with and without the addition of Y2O3– a combined STEM/XANES study

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62934-62943 ◽  
Author(s):  
Sabrina Seidel ◽  
Christian Patzig ◽  
Thomas Höche ◽  
Michael Krause ◽  
Martin Ebert ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Absorption Spectroscopy ◽  
Analytical Transmission Electron Microscopy ◽  
X Ray ◽  
Aluminosilicate Glasses ◽  
Transmission Electron ◽  
X Ray Absorption

The crystallization of magnesium–aluminosilicate glasses is monitored, described and discussedviaX-ray absorption spectroscopy and analytical transmission electron microscopy.

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