scholarly journals Dynamics of Trace Element Concentration During Development and Excitotoxic Cell Death in the Cerebellum ofLurcherMutant Mice

2009 ◽  
Vol 19 (4) ◽  
pp. 586-595 ◽  
Author(s):  
Jörg Bäurle ◽  
Jan Kučera ◽  
Sabine Frischmuth ◽  
Manfred Lambertz ◽  
Karel Kranda
Keyword(s):  
Cell Death ◽  
Trace Element ◽  
Element Concentration ◽  
Trace Element Concentration ◽  
Excitotoxic Cell Death

Incorporation of REE into leucophanite: a compositional and structural study

2007 ◽  
Vol 71 (06) ◽  
pp. 625-640 ◽  
Author(s):  
H. Friis ◽  
T. Balić-Žunić ◽  
C. T. Williams ◽  
R. Garcia-Sanchez
Keyword(s):  
Trace Element ◽  
Element Concentration ◽  
Trace Element Concentration ◽  
Compositional Variation ◽  
Chemical Compositions ◽  
Charge Balance ◽  
Element Abundances ◽  
Chemical Factors ◽  
Crystallization Conditions ◽  
Compositional Zonation

Abstract The crystal structures of nine, and the chemical compositions of ten, natural samples of leucophanite, ideally NaCaBeSi2O6F, were investigated. The analysed samples display a large compositional variation with trace-element abundances >50,000 ppm, primarily due to rare earth elements (REE). Fromthese data, we propose a substitution scheme for the incorporation of REE for Ca, with additional Na substituting for Ca and the generation of vacancies to ensure charge balance. Compositional zonation was observed in some samples; this zonation correlates with variations in cathodoluminescence. The crystal structure of the nine analysed samples could all be refined in space group P212121. We found no evidence for a reduction of symmetry with increased trace-element concentration. Various twin combinations were observed and these seem related to crystallization conditions rather than structural or chemical factors.

DETERMINATION OF TRACE ELEMENTS IN HUMAN SALIVA BY PIXE TECHNIQUE

1996 ◽  
Vol 06 (01n02) ◽  
pp. 273-276 ◽  
Author(s):  
P. HATAMI ◽  
H. PEYROVAN ◽  
H. AFARIDEH ◽  
S. SHOJAEI
Keyword(s):  
Trace Elements ◽  
Healthy Volunteers ◽  
Trace Element ◽  
Element Concentration ◽  
Trace Element Concentration ◽  
Human Saliva ◽  
Normal Range ◽  
Pixe Analysis ◽  
X Ray

Mineral trace element concentration of human saliva from healthy volunteers, were investigated by Proton-Induced X-ray Emission (PIXE) analysis. The specimens were bombarded with Proton beams of 2 MeV from a Van de Graaff accelerator at NRC . The object of this measurement was to find a normal range of trace element concentration for Iranian people.

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