Hormonal control of a gene encoding a putative PDR5-like ABC transporter in periwinkle
摘要:
ATP binding cassette (ABC) transporters retain increasing attention since their implication in multidrug resistance has been demonstrated in several prokaryotic and eukaryotic cells. Many ARC proteins are known in various organisms but only few in higher plants. We report here on the characterization of a partial 955 bp clone (Cr-ABC1) isolated from a Catharanthus roseus cDNA library, which shows high homology (65% identity) with the TUR2 cDNA previously isolated from the water lens Spirodela polyrrhiza. Accumulation of Cr-ABC1 transcripts in cultured C. roseus cells was enhanced by cytokinin or methyl jasmonate addition to, or auxin suppression from the culture medium. In whole plants, the gene was mainly expressed in flowers.
A novel modification of the Ritter reaction using trimethylsilyl cyanide
作者:H.G. Chen、O.P. Goel、S. Kesten、J. Knobelsdorf
DOI:10.1016/0040-4039(96)01890-4
日期:1996.11
A new modification of the Ritter reaction using trimethylsilylcyanide (Me3SiCN) is described, which converts alcohols to their corresponding formamides in high yields using a convenient procedure. The reaction conditions and mechanism are discussed. In some cases, new formamides are synthesized which cannot be prepared by the classical Ritter reaction.
Characterization of Route Specific Impurities Found in Methamphetamine Synthesized by the Leuckart and Reductive Amination Methods
作者:Vanitha Kunalan、Niamh Nic Daéid、William J. Kerr、Hilary A. S. Buchanan、Allan R. McPherson
DOI:10.1021/ac9005588
日期:2009.9.1
Impurity profiling of seized methamphetamine can provide very useful information in criminal investigations and, specifically, on drug trafficking routes, sources of supply, and relationships between seizures. Particularly important is the identification of “route specific” impurities or those which indicate the synthetic method used for manufacture in illicit laboratories. Previous researchers have