吐温80对99mTc-替曲膦脂溶性、血浆蛋白结合及生物分布的影响

通过向心肌灌注显像剂99mTc-替曲膦注射液中加入吐温80溶液得到99mTc-替曲膦+吐温80(w=0.1%)混合注射液. 对这2种注射液的脂水分配系数、血浆蛋白结合的测定以及小鼠体内的生物分布实验表明,吐温80的引入使配 合物99mTc-替曲膦的脂溶性、血浆蛋白结合及生物分布均发生了改变. 与未加 吐温80的99mTc-替曲膦注射液相比,混合注射液的生物性能得到明显改善,主要表现为肝摄取率的降低和心/肝摄取率比值的增加.     

微机控制的脉冲MIG/MAG焊接电源的研制

主电路采用IGBT为主控开关功率转换器件 ,利用 16位高性能单片机 80C196KC ,对微机控制脉冲MIG逆变弧焊电源的组成和控制原理进行实时精确控制的研制 ,并做了可靠性与抗干扰设计 .研制结果表明 :该焊机脉冲频率带宽大 ,为 0 .5～ 2 5 0Hz ,响应速度快 ,抗干扰能力强 ,能够满足全位置焊接的需要 .     

智能化多通道心脏监护系统的研制

介绍一种以Ｚ－８０ＣＰＵ为核心的智能化三通道心脏监护系统。系统在Ｚ－８０ＣＴＣ定时器的统一指挥下，每隔５ｍｓ顺序地对三床病人的心电信号采样、数据处理、分类报警、送记录和由ＤＭＡ高速数据传送器件送ＣＲＴ进行推移式显示、冻结显示，从而完成三通道实时心电自动监护的功能。     

Z80指令系统的计算机动态图形模拟

本文在APPLEⅡ微机上,使用APPLESOFT语言,运用高分辨率作图的方法,实现了对Z80指令系统的动态图形模拟。该程序清楚地图示了每一条Z80指令的执行过程,同时具有对Z80指令的汇编功能。     

Ni80Fe20复合结构多层膜的巨磁阻抗效应研究

用磁控溅射法在载玻片上制备了(Ni₈₀Fe₂₀/SiO₂)_n/Cu/(SiO₂/Ni₈₀Fe₂₀)_n复合结构多层膜， 并对其巨磁阻抗效应进行了研究.研究结果表明，采用多组双层结构(n>1)后，样品的巨磁阻抗效应明显增大；当n=3时，观测到最大的纵向巨磁阻抗(LMI)效应为10.81%，最大的横向巨磁阻抗(TMI)效应为17.08%.当n=4,5时，巨磁阻抗效应比n=3时略有减小. 由XRD谱和磁滞回线等，研究了双层结构(Ni₈₀Fe₂₀/SiO₂)循环次数n引起的样品材料晶体结构和磁性能等变化，以及对样品巨磁阻抗效应的影响.     

Molecular characterization of <Emphasis Type="Italic">Arabidopsis</Emphasis> PHO80-like proteins,a novel class of CDKA;1-interacting cyclins

Cyclins are regulatory proteins that interact with cyclin-dependent kinases (CDKs) to control progression through the cell cycle. In Arabidopsis thaliana, 34 cyclin genes have been described, grouped into five different types (A, B, D, H, and T). A novel class of seven cyclins was isolated and characterized in Arabidopsis, designated P-type cyclins (CYCPs). They all share a conserved central region of 100 amino acids (cyclin box) displaying homology to the corresponding region of the PHO80 cyclin from Saccharomyces cerevisiae and the related G1 cyclins from Trypanosoma cruzi and T. brucei. The CYCP4;2 gene was able to partially re-establish the phosphate-dependent expression of the PHO5 gene in a pho80 mutant strain of yeast. The CYCPs interact preferentially with CDKA;1 in vivo and in vitro as shown by yeast two-hybrid analysis and co-immunoprecipitation experiments. P-type cyclins were mostly expressed in proliferating cells, albeit also in differentiating and mature tissues. The possible role of CYCPs in linking cell division, cell differentiation, and the nutritional status of the cell is discussed.Received 9 February 2004; received after revision 18 March; accepted 19 April 2004     

Protein localization in the plant Golgi apparatus and the <Emphasis Type="Italic">trans</Emphasis>-Golgi network

This review presents plant-specific characteristics of the Golgi apparatus and discusses their impact on retention of membrane proteins in the Golgi or the trans-Golgi network (TGN). The plant Golgi consists of distinct stacks of cisternae that actively move throughout the cytoplasm. The Golgi apparatus is a very dynamic compartment and the site for maturation of N-linked glycans. It is also a factory for complex carbohydrates that are part of the cell wall. The TGN is believed to be the site from where vacuolar proteins are sorted by receptors towards each type of vacuole. To maintain the structure and specific features of the Golgi, resident proteins ought to be maintained in the proper Golgi cisternae or in the TGN. Two families of membrane proteins will be taken as examples for Golgi/TGN retention: (i) the enzymes involved in N-glycosylation processes and (ii) a vacuolar sorting receptor. Although the number of available plant proteins localized in Golgi/TGN is low, the basis of retention appears to be shared over all kingdoms and may result from pure retention and recycling mechanisms. In this review, we will summarize the characteristics of a plant Golgi and will discuss especially their consequences on on the study of this highly dynamic structure. We then choose membrane proteins with a single transmembrane domain to illustrate the signals and mechanisms involved in plants to localize and maintain proteins in the Golgi and the TGN.     

一种高效的柑橘绿霉菌基因敲除体系的构建

研究目的：提高柑橘绿霉菌基因敲除效率。创新要点：低效的基因敲除与丝状真菌非同源末端链接（NHEJ）的DNA双链断裂修复途径有关。为提高柑橘绿霉病菌基因敲除效率,本研究利用农杆菌介导的转化体系,获得NHEJ途径中关键因子Ku80的缺失突变体（△pdku80）。研究方法：与野生型菌株相比,以△PdKu80作为出发菌株,提高柑橘绿霉病菌PdbrlA和PdmpkA的基因敲除效率（见表1）。重要结论：△PdKu80的营养生长、产孢和致病性与野生型菌株基本一致。△PdKu80作为出发菌株,能显著提高柑橘绿霉菌的敲除效率。     

80后与90后群体人际信任差异研究

以人际信任量表（ITS）为研究工具,调查80后与90后群体的人际信任现状,结果表明：我国80后与90后群体的人际信任度处于偏低水平、社会信任低于特殊信任,80后群体的人际信任度显著高于90后群体的人际信任度;80后与90后群体中,女性的人际信任水平总体上高于男性,特别是在社会信任方面差异更为显著;是否独生子女、不同户籍的80后与90后群体在人际信任方面均不存在显著差异;不同身份的80后与90后群体在特殊信任、人际信任度上存在显著差异,非学生（职场青年）的特殊信任显著高于中专生.     

Span-80+Tween-60反胶束微乳液制备纳米α-Fe2O3研究

以环己烷为溶剂,Tween-60 Span-80为表面活性剂,异戊醇为助表面活性剂,采用反胶束微乳液法制备纳米α-Fe2O3.首先研究了V环己烷:V异戊醇=5时Tween-60 Span-80质量分数及w(Tween-60)对微乳液体系加溶水的能力的影响,得到体系加溶水的最优组成为表面活性剂质量分数为33.9%,w(Tween-60)=88%.在此基础上,采用反胶束微乳液法制备纳米Fe2O3,探讨了铁氧体的失重及晶型变化规律和x=nFe3 :n(Tween-60 Span-80)对Fe2O3粒径的影响.结果表明,当温度超过400 ℃时,铁氧体逐渐转化为α-Fe2O3,600 ℃时,铁氧体已全部转化为棕红色的α-Fe2O3;氧化铁颗粒的粒径随着x的增加而增大.