4-Dimethylamino-N-hydroxy-benz

Liquid Chromatography/Mass Spectrometry for the Detection and Quantification of N-Acyl-l-Homoserine Lactones and 4-Hydroxy-2-Alkylquinolines

High-performance liquid chromatography (HPLC) coupled in-line with mass spectrometry (MS) permits rapid and specific identification and quantification of N -acyl-l -homoserine lactones (AHLs) and 4-hydroxy-2-alkylquinolines (HAQs

植物生长抑制剂 plant growth retard ant

chloride ）、具有四价磷基的福斯佛 -D （ phosfon-D ， tributy1 － 2 ， 4 － dichloro － benzyl － phosphonium chloride ）、琥珀酸的胺衍生物 B 9 （二甲基氨基琥珀酸， N － dimethylamino － succinami － cacid ）等。这些主要是抑制节间的生长，造成人为的矮化，对赤霉素具有颉颃作用，但并不是抗赤霉素（ antigibberellin ），而是作为赤霉素生物合成的抑制剂而发生作用。现在已经发现

Oligodeoxyribonucleotides Synthesis: Phosphoramidite Approach

of the “phosphorodichloridite” coupling procedure reported earlier by Letsinger and coworkers ( 2 ). Essentially, the approach involved the reaction of the protected deoxyribonucleosides 1a–d (Fig. 1 ) with chloro-( N,N -dimethylamino) methoxyphosphine ( 2 ) in the presence