珠江口盆地开平凹陷油气聚集条件分析

珠江口盆地自新生代以来,曾先后受到不同方向张应力的作用,造成了不同时期构造体系的交叉叠合.中中新世以来构造运动强烈,并具有东强西弱的特点,对油气的运移与聚集产生了重要影响.开平凹陷的剧烈断裂和断陷活动始于始新世,并在同期沉积了巨厚的文昌组.晚渐新世以后,由于断裂活动非常微弱,在成熟的烃源岩与其上地层之间缺乏有效的油源断层,因而自生自储、近距离运移可能是开平凹陷油气聚集的基本特征.在凹陷内部,因重力滑动和欠压实泥岩共同作用所形成的KPll-1构造带可能是该区最具有油气远景的地区.     

Cloning, tissue expression, and chromosomal localization of the mouse IRS-3 gene

Insulin receptor substrate (IRS) proteins are key regulators of basic functions such as cellular growth and metabolism. They provide an interface between multiple receptors and a complex network of intracellular signaling molecules. Two members of this family (IRS-1 and IRS-2) have been identified previously. In this investigation, we analyzed a mouse expressed sequence tag clone that proved to be a new member of the IRS family. Sequence analysis of this clone and comparison with the sequences deposited in GenBank demonstrates this protein may be the murine homolog of rat IRS-3, recently purified and cloned from rat adipocytes. Accordingly, we have named our protein mouse IRS-3. The expressed sequence tag clone contains the complete coding sequence of 1485 bp, encoding a protein of 495 amino acids. Sequence alignment with the other members of the IRS family shows that this protein contains pleckstrin homology and phosphotyrosine-binding domains that are highly conserved. In addition, there is conservation of many tyrosine phosphorylation motifs responsible for interactions with downstream signaling molecules containing SH2 domains. The murine IRS-3 messenger RNA (2.4 kilobases in length) is expressed in many tissues, with highest levels in liver and lung. Mouse IRS-3 is highly expressed in the first part of the embryonic life, when IRS-1 messenger RNA is barely detectable. Unlike the genes encoding IRS-1 and IRS-2, the IRS-3 gene contains an intron (344 bp in length) in the region between the pleckstrin homology and the phosphotyrosine-binding domains. Fluorescent in situ hybridization localized the mouse IRS-3 gene on the telomeric region of chromosome 5G2. Cloning of the murine IRS-3 gene will make it possible to apply genetic approaches to elucidate the physiological role of this new member of the IRS family of proteins.     

Molecular cloning of CYP1A from the estuarine fish Fundulus heteroclitus and phylogenetic analysis of CYP1 genes: update with new sequences

Since we published a phylogenetic analysis of the CYP1A subfamily in 1995, several additional full-length sequences have been reported, including three members of an entirely new subfamily, CYP1B. Two avian sequences were recently published, so that CYP1A sequence data are now available from three of the five major vertebrate lineages. The two new branches that have been added to the CYP1 family tree significantly add to our understanding of P450 evolution. The inclusion of the CYP1Bs to the phylogenetic analysis allows us to root inferred trees. Addition of the avian CYP1As indicates that the CYP1A1/CYP1A2 duplication present in the mammalian lineage may have occurred after the divergence of birds and mammals. The number of fish species from which full-length coding regions of CYP1A genes have been sequenced has increased from four (trout, plaice, toadfish, and scup) to nine. These include CYP1A sequences from tomcod, butterflyfish, sea bream, sea bass, and the full-length sequence of CYP1A from the killifish Fundulus heteroclitus that is reported here. Phylogenetic analyses incorporating the new fish CYP1A sequences support our original conclusion that the fish CYP1As are monophyletic and indicate that the genes are evolving at very different rates in different species.     

给定拓扑结构的网络的可靠性设计

本文首先讨论了网络链路堵概率的加权平均值，提出了网络分配的一般准则，并在考虑了网络链路生存链路概率的因素后，提出了更一般的网络链路堵塞概率的加权平均值，以此为基础，分别讨论了网络在给定点的费用条件下，使得网络可靠性最大的网络设计问题，以及在给定网络可靠性指标的前提下，使得网络费用最小的网络设计问题。     

双乙醛草酰二肼直接快速光度法测定食品中痕量铜

研究了双乙醛草酸二肼与铜的显色反应，建立了分光光度法直接测定铜的新方法。试验结果表明，在pH8．0－10．0范围内，Cu2 与双乙醛草酸二肼形成稳定的紫红色配合物。该配合物在540nm处有一最大吸收峰，其表明摩尔吸光系数为2．4×104，铜量在0－12mg／50ml范围内符合比尔定律。共存离子干扰，误差仅 2.00％。用于食品中痕量钢测定．结果准确、可靠。     

基于ATM的网络互连方式

ＡＴＭ技术能否在数据通信网中广泛采用取决于其是否能高效地支持现有业务，其中主要为非连接业务。本文介绍了几种基于ＡＴＭ 的非连接业务支持方式和协议体系结构，对其进行了评述并对ＩＰ分组到ＡＴＭ信元的封装效率进行了分析。     

我国模压全息技术发展现况述评

模压全息技术作为一种高科技已在近年来得到迅速的发展并趋于成熟,模压全息能以较低的成本和较高的速度进行大批量的工业化生产。本文对我国模压全息技术发展现况进行了述评。     

航空油品高频/高压电脱水微观机理

设计并建立了一套高压电物理化学显微分析装置，为研究高压电物理化学领域的微观机理提供了一种新的技术途径。采用该技术，研究了胜利稠油经6％加氢裂解柴油稀释的原料油的高频／高压电脱水的微观机理。该原料的脱水率达96．7％，高于传统的电脱水方法。     

一种考虑不同期合闸的行波合闸保护新方法

当线路末端故障时，行波在线路末端的反射情况比较复杂，反向电流行波的极性有可能与正向电流行波的极性相反，而此时测距结果又与线路无故障时相同。因此，会造成行波测距式与行波极性比较式合闸保护的不正确动作。根据行波的折、反射理论，分析出当线路无故障时正向电流行波仅在线路末端发生反射，且电流行波的反射系数为-1，而当线路存在故障时，正向电流行波将在故障点发生反射，无论故障是否在线路末端，电流行波的反射系数都不会是-1。根据这一特征，提出了一种新的行波合闸保护方法。从原理上保证了在各种情况下保护都可以正确动作，大量的电磁暂态仿真结果也证明了这一点。