基于MSP430的无线环境监测装置设计

笔者应用MSP430单片机与CRX14射频芯片实现无线环境监测装置设计,通过对输出信号进行采集,实时检测出监测装置所在位置的环境信息,并通过无线传输的通信方式把数据发送至主站以进行环境信息检测及控制。     

Infection of cultured intestinal epithelial cells with severe acute respiratory syndrome coronavirus

To identify a model for the study of intestinal pathogenesis of severe acute respiratory syndrome (SARS) we tested the sensitivity of six human intestinal epithelial cell lines to infection with SARS coronavirus (SARS-CoV). In permissive cell lines, effects of SARS-CoV on cellular gene expression were analysed using high-density oligonucleotide arrays. Caco-2 and CL-14 cell lines were found to be highly permissive to SARS-CoV, due to the presence of angiotensin-converting enzyme 2 as a functional receptor. In both cell lines, SARS-CoV infection deregulated expression of cellular genes which may be important for the intestinal pathogenesis of SARS.Received 23 May 2004; received after revision 23 June 2004; accepted 25 June 2004     

Cardenolide biosynthesis in chrysomelid beetles

Summary Labeling experiments have shown that the chrysomelid beetleChrysolina coerulans is able to biosynthesize its own defensive cardenolides from cholesterol, via a pathway involving a C₂₁ intermediate, as in plants.     

Recognition of bacterial peptidoglycan by the innate immune system

The innate immune system recognizes microorganisms through a series of pattern recognition receptors that are highly conserved in evolution. Peptidoglycan (PGN) is a unique and essential component of the cell wall of virtually all bacteria and is not present in eukaryotes, and thus is an excellent target for the innate immune system. Indeed, higher eukaryotes, including mammals, have several PGN recognition molecules, including CD14, Toll-like receptor 2, a family of peptidoglycan recognition proteins, Nod1 and Nod2, and PGN-lytic enzymes (lysozyme and amidases). These molecules induce host responses to microorganisms or have direct antimicrobial effects.Received 15 January 2003; received after revision 28 February 2003; accepted 26 March 2003     

OOCr17Ni14Mo2钢抗氧化性研究

应用金相显微镜，电子探针，Ｘ射线衍射等实验手段，研究了常规铝脱氧和钙硅钡铝复合脱氧剂脱氧对ＯＯＣｒ１７Ｎｉ１４Ｍｏ２钢抗氧化性能的影响。周期性氧化实验表明，使用钙硅铝复合脱氧剂的ＯＯＣｒ１７Ｎｉ１４Ｍｏ２钢，奥氏体晶粒度细小且稳定，表面氧化膜牢固覆盖于金属基体，具有良好的抗氧化性能和抗热震性能。     

FDSM─SP（6）基态相变的研究

本文利用相干态，通过算子的微分表示，着重从粒子数维度研究了费米子动力学对称模型中ＳＰ（６）极限的基态相变。提取了形状相变的序参量，给出了与实验定性一致的结果。     

对^14C实验中两个问题的探讨

本文对~(14)C实验中的合成苯时乙炔的液化现象及测量前加入闪烁体BuPBD时间两问题进行了探讨,提出了改进措施。加快了合成苯的速度并提高了产量;使液体闪烁计数器计数更加精确。     

1-(4-甲基苄基)哌啶-4-酮-6-氯吡啶-3-甲基肟醚的合成、单晶结构分析以及生物活性的测定

通过1-(4-甲基苄基)哌啶-4-酮肟醚与2-氯-5-氯甲基吡啶的亲核取代反应合成了一个未见文献报道的化合物:1-(4-甲基苄基)哌啶-4-酮-6-氯吡啶-3-甲基肟醚.目标化合物的结构经过元素分析、IR、1H MNR及单晶X-射线衍射测定确定.该单晶属于单斜晶系,空间群为P2(1),a=9.486(6),b=6.317(4),c=15.027(10),α=90,β=93.178(8),γ=90°,V=899.0(10)3,Z=2,Dc=1.270 g/cm3,μ=0.223 mm-1,Mr=343.85,F(000)=364,S=1.019,R=0.0732以及wR=0.1902.目标化合物的结构是非平面的,哌啶环是一个椅式结构.哌啶环与苯环的二面角为86.1(9)°.此单晶中没有分子内和分子间氢键的存在.初步杀菌活性测试表明,在浓度为1×10-4时该化合物有广谱的的杀菌活性.