Phenolics were extracted from litchi fruit pericarp (LFP) tissues, purified and their antioxidant properties analyzed. LFP phenolics strongly inhibited linoleic acid oxidation and exhibited a dose-dependent free-radical scavenging activity against alpha,alpha-diphenyl-beta-picrylhydrazyl (DPPH*) and hydroxyl radicals and superoxide anions. The degradation of deoxyribose by hydroxyl radicals was...

A simplified model of particle transport at a quasiparallel one-dimensional collisionless shock is suggested. In this model the MHD-turbulence behind the shock is dominated by a circularly polarized, large amplitude Alfvén wave originated upstream from the turbulence excited by particles leaking from the downstream medium. It is argued that such a wave having significantly increased its magneti...

The silicon PIN photodiodes were designed and fabricated in the conventional bipolar planar technology by using novel methods to reduce the leakage current. The new process steps like gettering, oxide stacking fault removing, ion implantation with suitable masking and improving shallow junction technology were implemented to fabricate PIN photodiodes of different active area such as 1 mm × 1 mm...

Effects of a lightly-doped-drain (LDD) implantation condition on the device characteristics of poly-Si TFT have been studied. For a LDD implantation dose of 2–4 × 1013 cm−2, no significantly large difference in on-state current and off-state leakage is found. For a LDD implantation energy of 50–100 keV, however, the higher LDD implantation energy results in smaller off-state leakage and more re...

The effect of tetraethylammonium ion (TEA) on the voltage clamp currents of nodes of Ranvier of frog myelinated nerve fibers is studied. The delayed K currents can be totally abolished by TEA without affecting the transient Na currents or the leakage current in any way. Both inward and outward currents disappear. In low TEA concentrations small K currents remain with normal time constants. The ...