A new bibenzyl derivative from Pleione bulbocodioides

A new bibenzyl derivative 1, named 2-（4＇＇-hydroxybenzy1）-3-（3＇-hydroxyphenethy1）-5-methoxy-cyclohexa-2,5-diene-1,4- dione, and two known stilbenoids （2, 3） were isolated from the tubers of Pleione bulbocodioides （Franch.） Rolfe. Their structures were elucidated by spectroscopic methods.     

A New Ceramide from the Ascomycete Tuber indicum

A new C-18 phytosphingosine derivative (1) was isolated from the fruiting bodies of Tuber indicum. Its structure was established as (2S,3S,4R,2′R)-2-N-(2′-hydroxytricosanoyl)-octadecan-1,3,4-triol by spectral and chemical methods.     

A New Cyclic Bisdesmoside from Tubers of Bolbostemma paniculatum

The structure of tubeimoside V (1), a new cyclic bisdesmoside, isolated from tubers of Bolbostemma paniculatum (Tu Bei Mu), was established by means of 2D NMR spectral and chemical methods. Compound 1 has inter-saccharide chain bridging by a dicrotalic acid to form aunique macrocyclic structure.     

特异切割马铃薯纺锤形块茎类病毒的Ribozyme的体外活性测定

本文报道根据Ribozyme的作用模式、设计、合成并克隆了特异性切割马铃薯纺锤形块茎类病毒(PSTV)正链和负链RNA的Ribozyme基因。以转录的PSTV正链及负链RNA作为底物与转录的Ribozyme RNA一起保温检测Ribozyme的体外切割活性。实验结果表明,当在50℃保温时,特异性切割PSTV正链及负链的Ribozyme在体外具有相当高的特异性切割活性;并且当在25℃保温时,Ribozyme仍具有相当的切割活性。在此基础上,正试图将Ribozyme基因导入马铃薯植株以检测其体内活性。