半群关于自身的局部化

证明丰群A关于自身局部化A_A是其极大Abel群同态象,这时A的象集恰为A的极大可消半群象。还进一步证明,如果S为A的理想且为内区,则S关于S的局部化恰好等于A关于A的局部化。最后证明了交换逆半群关于幂等无半格的局部化同构于其关于本身的局部化。     

差异展示法鉴定GA3诱导的水稻差异表达的mRNA

赤霉素是植物生长发育过程中一类重要的调节激素，在水稻不育系上喷施合适浓度的ＧＡ３（赤霉素的一种）可以克服其包颈现象。运用反转录和聚合酶链式反应建立了一套旨在分离差异表达ｃＤＮＡ的差异展示方法。     

软件国际化与本地化技术的研究

在介绍软件国际化和本地化概念的基础上，讨论了软件国际化和本地化的基本技术，并深入研究和探讨了软件国际化和本地化引起的技术问题及其解决方案．     

断层波状构造及其控矿规律的定量研究

利用趋势分析与结构分析相结合的定量方法对断层的各级变异及波状构造进行分解和定量模拟,总结出断层波状构造的分级控矿和矿化局部化规律。据此,对研究区深边部盲矿体进行定位预测,指出了两个潜在工业矿化区。     

短小芽孢杆菌质粒pCJ3的衍生质粒pAl32的酶谱及抗性基因定位

从短小芽孢杆菌四环素抗性质粒pCJ3截短的衍生质粒pAL32,经用6种限制酶双酶解试验,根据琼脂糖凝胶电泳带估算各片段的分子量,作出了pAL32的6种限制酶图谱。利用已除去复制功能的金黄色葡萄球菌质粒pUB110与pAL32构建的Km~rTc~r的双抗性重组质粒pSC33为载体,在EcoRV位点克隆的λDNA片段的重组子均为Km~rTc~s。用pUB110与pAL32在PvuⅡ位点连接后的重组质粒也为Km~rTc~s。根据这些重组子四环素抗性的失活,推知pAL32上EcoRV与PvuⅡ切点均位于其四环素抗性基因上。     

Nuclear localization of mouse fibroblast growth factor 2 requires N-terminal and C-terminal sequences

In vertebrates, different isoforms of fibroblast growth factor 2 (FGF2) exist, which differ by their N-terminal extension. They show different localization and expression levels and exert distinct biological effects. Nevertheless, genetic inactivation of all FGF2 isoforms in the mouse results in only mild phenotypes. Here, we analyzed mouse FGF2, and show that, as in the human, mouse FGF2 contains CTG-initiated high molecular-weight (HMW) isoforms, which contain a nuclear localization signal, and which mediate localization of this isoform to the nucleus. Using green fluorescent protein-FGF2 fusions, we furthermore observed, that C-terminal deletions disable nuclear localization of the short low-molecular-weight (LMW) 18-kDa isoform. This loss of specific localization is accompanied by a loss in heparin binding. We therefore suggest that, first, localization of mouse FGF2 is comparable to that in other vertebrates and, second, FGF2 contains at least two sequences important for nuclear localization, a nuclear localization sequence at the N terminus which is only contained in the HMW isoform, and another sequence at the C terminus, which is only required for localization of the LMW 18-kDa isoform. Received 1 July 2003; accepted 14 August 2003     

Homocysteine increases the synthesis of adrenomedullin in vascular fibroblasts of rats

Homocysteine (Hcy), a highly reactive sulfur- containing amino acid, is an intermediate product of methionine metabolism. Elevation of plasma Hcy has been widely studied as an independent risk factor for many cardiovascular diseases such as atherosclerosis, thrombosis, etc.[1]. Inherited hyperhomocysteinemia cases usually suffer from occlusion or thrombosis in arteries and large veins before the age of 20. Hyperhomocysteinemia significantly reduces the survival rate[2] and dilatation functi…     

基于多边约束的数据融合网络定位

无线传感网络定位方法近几年来受到广泛的关注。分布式算法是传感网络定位的一个主要要求,它不仅能减小计算和通信负载,同时对络的非连通性有很好的鲁棒性,对测量噪声克服也有一个很好的实现方案。虽然多种测量技术都能实现位置估计,但都存在某些不足。数据融合是一个很好的解决方案。提出了一个数据融合的结构和模糊优化数据融合算法。对每个节点的TOA和RSS数据进行融合。仿真表明位置估计的精度能够得到显著的改进,同时算法的复杂度也得到了降低。     

Localization for the Non-Invasive Detecting Capsule in GI Tract Utilizing Permanent Magnet and Magnetoresistive Sensors

The paper reports the localization principle and method for the capsule in the non-invasive detecting system of gastrointestinal (GI) tract utilizing one permanent and three magnetoresistive sensors. When the capsule is localized in practice, the permanent magnet is fixed inside the capsule, and the four magnetoresistive sensors are installed outside body. The permanent magnet's coordinate values can be solved by the magnetic dipole theory and optimum iterated method. The experiment shows the localization distance can reach 300 mm by employing the HMCI023 magnetoresistive sensors and the NdFeB45 φ9 mm × 5 mm permanent magnet, and the errors of single coordinate direction and radius vector are 0 - 58 mm and 0.1-62.9 mm respectively. The localization precision is acceptable basically, and it has some possibilities improving the precision and distance in the future. Moreover, the localization system makes the localization be reality because of decreasing the number of sensors, and it economizes the capsule's volume because of decreasing the permanent magnet's dimension, too.