Four different methods for calculating interface state density in vertical SiO2/4H-SiC metal-oxide semiconductor (MOS) capacitors were employed on the same samples. The Terman, ac, quasi-static, and Hi-Lo methods were used to extract surface state densities from the SiO2/SiC interface. Surface state densities from 10(11) to 10(12) cm(-2) eV(-1) were obtained, depending on the method employed. The Hi-Lo method is particularly susceptible to underestimating the trap density if UV light is not used to empty all the deep-lying traps during measurement. (C) 2003 The Electrochemical Society.
Asperlicin (1), a competitive cholecystokinin (CCK) antagonist, produced from Aspergillus alliaceus, was originally characterized primarily by means of X-ray crystallography.1~3) The compound contains a 1,4-benzodiazepine ring with a quinazolone fused to the 1,2-positions, and a 3substituted moiety condensed from tryptophan and leucine. This was the first reported naturally occurring nonpeptide antagonist of a peptide receptor. Subsequently, several possible therapeutically useful CCK antagonists were synthesized based on the benzodiazepine nucleus of asperlicin.4) Furthermore, benzodiazepines represent an important class of drugs which are widely used as anti-anxiety agents and hypnotics.5) We have recently isolated a series of substance P antagonists, benzomalvins A (2), B and C, from a Penicillium sp.6) Structural studies using 2D NMR clearly demonstrated that the benzomalvins possess the same quinazolino-benzodiazepine-dione ring
Harnish PP, Fountaine H, Ebrahimi R. Iodixanol: experience in 1,259 patients in the United States. Invest Radiol 1994;29: S236–S237.
A flexible and high yield synthesis of alpha-amino-beta-keto esters has been developed via acylation of the ketimine derivatives of alpha-amino esters. These alpha-amino-beta-keto-esters were acylated with chiral amino acid derivatives in 36-95% yields
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
