Terahertz (THz) time-domain spectroscopy is carried out for micro/nanostructured periodic Au/dielectric sphere arrays on Si substrate. We find that the metal-insulator transition can be achieved in THz bandwidth via varying sample parameters such as the thickness of the Au shell and the diameter of the Au/dielectric sphere. The Au/polystyrene sphere arrays do not show metallic THz response when...

This paper reports the results of our use of Cavity Ring Down Spectroscopy to extend the study of highly excited vibrational states in HCN. We extend our previous study of the HCN isotopomer, reporting on some weaker bands between 17 500 and 19 500 cm. We also report spectra of overtone and combination bands with six, seven, and eight quanta of stretching vibration in the isotopomers HCN and HC...

Natural single-crystal specimens of the herderite-hydroxylherderite series from Brazil, with general formula CaBePO4(F,OH), were investigated by electron microprobe, Raman, infrared and near-infrared spectroscopies. The minerals occur as secondary products in granitic pegmatites. Herderite and hydroxylherderite minerals show extensive solid solution formation. The Raman spectra of hydroxylherde...

background: oxidative modification of low-density lipoprotein (ldl) appears to be an early step in the pathogenesis of atherosclerosis. meanwhile, myeloperoxidase (mpo)-catalyzed reaction is one of the potent pathway for ldl oxidation in vivo. the aim of this study was to evaluate in vitro antioxidant effects of vitamins c and e on ldl oxidation mediated by mpo. methods: mpo was isolated from f...

to use remote sensing data effectively, one must understand the spectral characteristics of the particular features under investigations. to study the relationship between soil salinity and soil reflectance, four multispectral scanners (mss) and seven thematic mappers (tm bands) over the ardakan playa located on the central iranian desert margins were selected. in this study soil map, soil ...

Ajowan is one of the most important members of medicinal plants of the Apiaceae, consumed by humans. The aim of this study was to explore genetic variability of 20 ajowan populations by ISSR fingerprinting and evaluation of traits at germination. Out of the 30 ISSR primers, ten generated reproducible and polymorphic bands. A total of 93 bands were detected out of which 65 were polymorphic. High...

We have examined the diversity and similarity of visible dust bands and infrared dust bands based on data obtained by our ground-based observations (Ishiguro et al. 1999, ApJ 511, 432) and by the Infrared Astronomy Satellite (IRAS). It is found that the latitude profile of visible dust bands at the solar elongation, A — A® = 89°, is similar to that of infrared dust bands, except for the appeara...

Hepatitis B surface antigen, subtype ad, was purified and studied by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions. Two major bands with molecular weights of 23,500 and 27,500 and several weaker bands with higher molecular weights were observed. When the low-molecular-weight bands and the group of high-molecular-weight bands were excised from the gel, elute...