scholarly journals Investigation of the mechanism of mercury removal from silver- amalgam alloy

2004 ◽  
Vol 69 (12) ◽  
pp. 1111-1120 ◽  
Author(s):  
Zoran Odanovic ◽  
M. Djurdjevic
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Thermal Treatment ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Dental Amalgam ◽  
Mercury Removal ◽  
Chemical Compositions ◽  
Removal Mechanism ◽  
Scanning Electron

An investigation of silver dental amalgam decomposition and the mercury removal mechanism was performed. The decomposition process was analyzed during thermal treatment in the temperature interval from 400 ?C to 850 ?C and for times from 0.5 to 7.5 h. The chemical compositions of the silver dental amalgam alloy and the treated alloy were tested and microstructure analysis using optical and scanning electron microscopy was carried out. The phases were identified using energy disperse electron probe microanalysis. A mechanism for the mercury removal process from silver dental amalgam alloy is suggested.

Dentin in Severe Fluorosis: a Quantitative Histochemical Study

2007 ◽  
Vol 86 (9) ◽  
pp. 857-861 ◽  
Author(s):  
F. Rojas-Sánchez ◽  
M. Alaminos ◽  
A. Campos ◽  
H. Rivera ◽  
M.C. Sánchez-Quevedo
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dental Caries ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Histochemical Study ◽  
Fluoride Exposure ◽  
Quantitative Electron Probe Microanalysis ◽  
Scanning Electron

Dentin responds to different alterations in the enamel with hypermineralization, and is a biomarker of fluoride exposure. We hypothesized that severe fluorosis would lead to hypermineralization of the dentin when the enamel was severely affected. We used scanning electron microscopy and quantitative electron-probe microanalysis to compare dentin and enamel from healthy and fluorotic teeth. The dentin in fluorotic teeth was characterized by a highly mineralized sclerotic pattern, in comparison with control teeth (p < 0.001) and fluorotic enamel lesions (p < 0.001). Enamel near the lesions showed hypercalcification in comparison with dentin (p < 0.001). In response to the effects of severe fluorosis in the enamel, the dentin showed hypermineralization, as found in other enamel disorders. The hypermineralization response of the dentin in our samples suggests that the mechanism of the response should be taken into account in dental caries and other dental disorders associated with severe fluorosis.

The Occurrence of Copper-Psoromic Acid in Lichens From Cupriferous Substrata

1990 ◽  
Vol 22 (3) ◽  
pp. 345-354 ◽  
Author(s):  
O. William Purvis ◽  
John A. Elix ◽  
Kim L. Gaul
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Infrared Absorption ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
The Other ◽  
Infrared Absorption Spectroscopy ◽  
Acid Complex ◽  
The Impact ◽  
Scanning Electron

AbstractThe localization of psoromic acid and copper in partly green, copper-rich specimens of Lecidella bullata and Tephromela testaceoatra collected in Norway was studied by optical microscopy, scanning electron microscopy, and electron probe microanalysis. Infrared absorption spectroscopy of lichen material and of a synthetic copper-psoromic acid complex, and the other techniques, provide evidence that complexing of copper by psoromic acid occurs within specific areas of these lichens and this leads to their unusual colouration. In contrast, a specimen of copper-rich Lecanora cascadensis, which contains psoromic and usnic acids, does not contain such a complex. From the evidence obtained it is suggested that taxonomists should pay attention to the impact of rock and lichen chemistry on the appearance of lichen thalli.

scholarly journals Fracture analysis of the circulating pump bolts

2020 ◽  
Vol 213 ◽  
pp. 02017
Author(s):  
Chengjun Jiang ◽  
Wei Wang ◽  
Xiaohui Zou ◽  
Jifeng Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Power Plant ◽  
Stress Corrosion ◽  
Optical Microscopy ◽  
Electron Probe Microanalysis ◽  
Electron Probe ◽  
Fracture Analysis ◽  
Chloride Ions ◽  
Scanning Electron

The microstructure, micrograph of the fracture sections and the alloy elements distribution of the fractured flange-connecting bolts of 3# circulating pump in a power plant were analyzed by the scanning electron microscopy, the optical microscopy and the electron probe microanalysis. The results showed that the failed bolts’ material is not the design material, and failure of the bolts is due to the stress corrosion crack propagation of the bolts’ austenitic material by chloride ions in seawater.

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