The Photomagnetoelectric Effect in Mercury Iodide
In order to investigate the transport properties of mercury iodide, measurements of photomagnetoelectric (PME) effect and photoconductivity (PC) have been carried out. The experimental results show the presence of trapping phenomena and a strong dependence of carrier lifetimes on the light injection level. The obtained values of the lifetimes are in the range 10-7-10-6 s.
Low-Temperature Photomagnetoelectric Properties of Gold-Doped n -Type Silicon
The photomagnetoelectric (PME) effect was observed between 21 and 84\ifmmode^\circ\else\textdegree\fi{}K in silicon doped with gold and phosphorus. A generalized diffusion equation is formulated and solved with the impurity centers included in the charge-balance equation and arbitrary intensity of steady illumination. When the carrier densities are much smaller than the gold density, the charged impurities maintain charge neutrality, and this results in a range of injection where $\ensuremath{\Delta}p={\ensuremath{\Gamma}}_{1}\ifmmode\times\else\texttimes\fi{}\ensuremath{\Delta}n+{\ensuremath{\Gamma}}_{2}\ensuremath{\Delta}{n}^{2}$. If the quadratic term dominates, the PME current is proportional to the $\frac{4}{3}$ power of the photoconductance. This power law is observed in our measurements, from which we deduce values for the product $\ensuremath{\gamma}_{\frac{1}{2}}^{\frac{1}{2}}{\ensuremath{\tau}}_{n}$ between 36 nsec and 63 \ensuremath{\mu}sec.
Thorium-induced Anatomical and Histopathological Changes in Liver of Swiss Mice
ObjectivePresent study is aimed to investigate the anatomical and histopathological changes in liver tissues of Swiss albino male mice, one month after intravenous administration of thorium (232Th; 4 and 40 mg/kg).MethodsSynchrotron X-ray micro-CT imaging, CD31 immuno-cytochemistry, hematoxylin & eosin staining and Periodic acid-Schiff staining were performed to study changes in liver anatomy, blood vessels/capillaries, histology and glycogen content of liver, respectively.ResultsSynchrotron X-ray micro-CT imaging of liver showed loss of blood vessels in mice treated with thorium (4 mg/kg), which was more prominent at higher dose of thorium (40 mg/kg). These thorium-induced changes in liver were correlated with the decrease in CD31 positive cells and loss of tissue architecture. A dose-dependent increase in glycogen content was also observed in the liver of thorium-treated mice.ConclusionOur results provide novel insight about the effects of thorium on liver, which may have significant implications in understanding the mechanism of thorium thorium-induced hepatotoxicity.