不同产地枸杞子中多糖含量的比较研究

目的：建立枸杞子中多糖的测定方法，比较不同产地枸杞子中多糖含量的差异。方法：采用蒽酮-硫酸法测定宁夏、青海、新疆等3个产地86批次枸杞子中多糖的含量，分析差异，并进行方法学考察。结果：方法线性关系、回收率、精密度及重复性测定结果均符合要求，不同产地枸杞子中多糖含量范围为1.71%～4.56%，多糖含量高低顺序为青海>新疆>宁夏。结论：蒽酮-硫酸法可用于枸杞子多糖含量的测定，不同产地的枸杞子中多糖含量有一定差异，其中青海产地枸杞子中的多糖含量最高。     

The importance of heparan sulfate in herpesvirus infection

Herpes simplex virus type-1 (HSV-1) is one of many pathogens that use the cell surface glycosaminoglycan heparan sulfate as a receptor.Heparan sulfate is highly expressed on the surface and extracellular matrix of virtually all cell types making it an ideal receptor.Heparan sulfate interacts with HSV-1 envelope glycoproteins gB and gC during the initial attachment step during HSV-1 entry.In addition,a modified form of heparan sulfate,known as 3-O-sulfated heparan sulfate,interacts with HSV-1 gD to induce fusion between the viral envelope and host cell membrane.The 3-O-sulfation of heparan sulfate is a rare modification which occurs during the biosynthesis of heparan sulfate that is carded out by a family of enzymes known as 3-O-sulfotransferases.Due to its involvement in multiple steps of the infection process,heparan sulfate has been a prime target for the development of agents to inhibit HSV entry.Understanding how heparan sulfate functions during HSV-1 infection may not only be critical for inhibiting infection by this virus,but it may also be crucial in the fight against many other pathogens as well.     

大肠杆菌中核糖体蛋白质S12依赖链霉素突变抑制λN基因的表达

将质粒pKC101上λcI基因切除，建成新质粒pHD109。用F'cI857控制质粒pHD109上λN基因的表达。结果表明：（1）核糖体蛋白质S12依赖链霉素突变抑制λN基因的表达；（2）F’cI857对质粒pHD109上λN基因表达的调节，受温度的控制。