（1R，3R）－（－）－1－甲氧基－5，6－亚甲二氧基－3－（3，4，5－三甲氧苯基）－异苯并二氢呋喃的选择性合成

在ＬｉＡｌＨ４及光学活性物质（５Ｒ）－孟氧基－２（５Ｈ）－呋喃酮（５）存在下，将６－（３′，４′，５′－三甲氧基羟卞基）－胡椒醛二甲缩醛（４）的甲苯溶液加热回流８小时，可得旋光性的（１Ｒ，３Ｒ）－（－）－１－甲氧基－５，６－亚甲二氧基－３－（３，４，５－三甲氧苯基）－异苯并二氢呋喃晶体（１），产率６１．８％．     

Sb＿2O＿3－ZnSn（OH）＿6－ZnNH＿4PO＿4阻燃体系的研究

研究了在聚氯乙烯（ＰＶＣ）中，Ｓｂ＿２Ｏ＿３－ＺｎＳｎ（ＯＨ）＿６，Ｓｂ＿２Ｏ＿３－ＺｎＮＨ＿４ＰＯ＿４，ＺｎＳｎ（ＯＨ）＿６－ＺｎＮＨ＿４ＰＯ＿４二元体系的协同阻燃性能，以及Ｓｂ＿２Ｏ＿３－ＺｎＳｎ（ＯＨ）＿６－ＺｎＮＨ＿４ＰＯ＿４三元系的阻燃性能，采用混料回归实验设计，导出了三元系氧指数与阻燃剂含量关系的数学模型，经计算机计算并绘制出了氧指数等值图，该体系中Ｓｂ＿２Ｏ＿３－ＺｎＳｎ（ＯＨ）＿６，Ｓｂ＿２Ｏ＿３－ＺｎＮＨ＿４ＰＯ＿４复配具有正的协同作用，而ＺｎＳｎ（ＯＨ）＿６－ＺｎＮＨ＿４ＰＯ＿４复配则表现为负的协同作用。     

SF6断路器灭弧室内电弧与气流间的相互作用

采用将一维电弧模型与二维气流场相结合的计算方法，对ＳＦ６断路器灭弧室内大电流稳态燃弧期间电弧与气流间的相互作用进行了计算分析，着重研究了电弧阻塞效应及其应用，并对不同灭弧室结构对热气流场的影响进行了探讨，最后给出了更适合于混合型ＳＦ６断路器的灭弧室结构。     

异种钢接头中氢扩散行为及冷裂纹特征

本文采用氚自射线照相法及接头充氢后释放规律的观察，研究了用Ｃｒ２０Ｎｉ１０Ｍｎ６型焊条焊接珠光体类钢时氢的扩散及分布规律。利用高碳钢淬火试样及淬火后充氢试样的拉伸试验，研究了高碳钢淬硬组织对氢和应力的敏感性。探讨了Ｃｒ２０Ｎｉ１０Ｍｎ６／高碳钢接头中不同部位形成裂纹的性质、产生原因和防止措施。所得结论，为正确选用焊条及制定高碳钢的焊接工艺提供了试验和理论依据。     

吡啶-2,6-二羧酸体系荧光法同时测定地质和环境试样中的钐、铕、铽、镝

本文研究了吡啶-2,6-二羧酸体系荧光法同时测定钐、铕、铽、镝的最佳条件及共存离子的影响等。本法与阳离子交换树脂联用,分离测定了地质和环境试样中的钐、铕、铽、镝含量。     

2－［3－（5－硝基苯并异噻唑）偶氮］－6－异丙基苯酚的合成、结构和性质研究

以２－氰基－４－硝基苯胺为原料合成了３－氨基－５－硝基－２，１－苯并异噻唑，并使之与邻异丙基苯酚偶联，得到２－［３－（５－硝基苯并异噻唑）偶氮］－６－异丙基苯酚（５－ＮＯ２ＢＰＡＩＰ），测得其ｐＫａ为７．０８．光度法和ｐＨ滴定表明它有可能成为一个敏锐的酸碱指示剂和Ｃｕ２＋、Ｃｏ２＋、Ｎｉ２＋等离子的显色剂。     

在乳化剂OP存在下钒钼杂多酸罗丹明6G荧光淬灭法测定微量钒

在酸性溶液中，钒钼杂多酸根与罗丹明６Ｇ生成离子缔合物，使罗丹明６Ｇ荧光定量淬灭，建立了微量钒荧光分析新方法，该方法灵敏度高，选择性好，工作曲线线性范围为０～２．５μｇ／２５ｃｍ３，操作简便，用于钢样中微量钒的测定．效果较好。     

Morphine 6 glucuronide stimulates nitric oxide release in mussel neural tissues: evidence for a morphine 6 glucuronide opiate receptor subtype

We have previously demonstrated that Mytilus edulis pedal ganglia contain opiate alkaloids, i.e., morphine and morphine 6 glucuronide (M6G), as well as mu opiate receptor subtype fragments exhibiting high sequence similarity to those found in mammals. Now we demonstrate that M6G stimulates pedal ganglia constitutive nitric oxide (NO) synthase (cNOS)-derived NO release at identical concentrations and to similar peak levels as morphine. However, the classic opiate antagonist, naloxone, only blocked the ability of morphine to stimulate cNOS-derived NO release and not that of M6G. CTOP, a mu-specific antagonist, blocked the ability of M6G to induce cNOS-derived NO release as well as that of morphine, suggesting that a novel mu opiate receptor was present and selective toward M6G. In examining a receptor displacement analysis, both opiate alkaloids displaced [³H]-dihydromorphine binding to the mu opiate receptor subtype. However, morphine exhibited a twofold higher affinity, again suggesting that a novel mu opiate receptor may be present. Received 1 November 2001; received after revision 1 February 2002; accepted 1 February 2002     

Two virus-encoded RNA silencing suppressors, P14 of Beet necrotic yellow vein virus and S6 of Rice black streak dwarf virus

Functional analysis for gene silencing suppressor of P14 gene of Beet necrotic yellow vein virus and S6 gene of Rice black streak dwarf virus was carried out by agro- infiltration with recombinant vectors of Potato virus X. The phenotype observation of green fluorescent protein (GFP)expression and Northern blot showed that the gene silencing of gfp transgenic Nicotiana benthamiana induced by homologous sequence was strongly suppressed by the immixture infiltration of either the P14 or the $6. In the suppressed plants, the gfp mRNA accumulation was higher than that in the non-suppressed controls and the symptoms caused by PVX infection became more severe, especially the gfp DNA methylation of plant genome was significantly inhabited when co-infiltrated with RBSDV S6 gene. These results suggested that these two virus genes were potentially to encode for proteins as RNA silencing suppressors.     

浅析IPv6的安全性

与IPv4相比,IPv6具有许多优势。Ipv6不但解决了当今IP地址匮乏的问题,并且由于它引入了加密和认证机制,实现了基于网络层的身份认证,确保了数据包的完整性和机密性,因此,可以说IPV6实现了网络层安全。但是,这种安全不是绝对的,并且,由于IPV6的安全机制给当前的网络安全体系带来了新的挑战,致使许多在现有的网络中对保护网络安全中起着重要作用的工具受到巨大的冲击,这就迫切需要安全专家进一步研究和积累经验,尽快找出合适的解决方法。