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中枢神经系统（CNS）由大量的神经细胞组成,星形胶质细胞是其中分布最广的一类神经胶质细胞,具有营养支持、调节神经递质及影响突触功能等多种生理功能。星形胶质细胞高表达基因-1（AEG-1）是一种原癌基因,对多种CNS肿瘤细胞的增殖、发展及转移有重要影响。本文从AEG-1对CNS肿瘤的诊断、治疗和预后评估方面的作用进行综述,寻找新的标志物用于CNS肿瘤的诊断和治疗

Studies on the chemical constituents of Clinopodium gracile seed

【中文摘要】 对细风轮菜种子化学成分的研究表明,种子含大量脂肪油(23.25%),油中含大量不饱和脂肪酸:亚麻酸(66.929%)、亚油酸(21.813%)、油酸(4.596%),总量达93.338%。此外,种子还含18种氨基酸和18种矿质元素。因此,种子和种子油具有较高营养价值和药用保健功效。 【英文摘要】 The chemical constituents of Clinopodium gracile seeds have been studied. The results showed that the seed is rich in fatty oil (23.25%) and the main constituents in fatty oil are α-Linoleni acid 66.929%, linolic acid 21.813% and oleic acid 4.596%, the total content of unsaturated fatty acid reaches 93.186%. Eighteen amino acids and eighteen mineral elements are also determined. The seed of Clinopodium gracile has high nutritive and medicinal values.福建省教委基金资助项目(K20096);国家中医药管理局和福建省卫生厅基金项目(NO.2000-J-P-40

倏逝场作用氧化石墨烯大能量耗散孤子锁模双包层光纤激光器

报道了倏逝场作用氧化石墨烯的可饱和吸收体用于锁模掺镱双包层光纤激光器,产生大能量151.54nJ耗散孤子.利用熔锥光纤倏逝场诱导沉积氧化石墨烯方法,所制备的可饱和吸收体不仅拥有耐高功率、光纤兼容等优点;而且,熔锥光纤引入光带通滤波,有益于耗散孤子在光纤激光腔中形成.同时结合光纤包层泵浦技术,高脉冲能量耗散孤子在锁模掺镱双包层光纤激光器中被获得,产生的耗散孤子单脉冲能量高达151.54nJ,重复频率271.4kHz,信噪比57dB.国家自然科学基金(61275050);高等学校博士学科点专项科研基金(20120121110034

Tannin dynamics of Kandelia candel roots in different salinity culture

对不同盐度(0‰-40‰)栽培下秋茄根的总酚、可溶性缩合单宁、结合缩合单宁、总缩合单宁的含量进行测定,探讨盐度对单宁生产的效应.结果表明:(1)不同盐度下栽培60-135d,总酚含量在相同盐度条件下随栽培时间的延长呈现出先波动而后升高的趋势,其中总酚最高含量出现在高盐度,说明一定的高盐度胁迫可以促进总酚的合成;总缩合单宁与可溶性缩合单宁含量变化趋势相似,其中可溶性缩合单宁含量显著高于结合缩合单宁.(2)在15‰盐度下栽培75-135d,秋茄根不同部位的总酚、可溶性缩合单宁、结合缩合单宁和总缩合单宁含量有相似的变化趋势,即由根尖往远离根尖的部位呈下降趋势.Total phenolics(TP),extractable condensed tannins(ECT),bound condensed tannins(BCT),and total condensed tannins(TCT) contents of Kandelia candel roots in different salinity culture were determined.In addition,the effect of salinity on tannin production was studied.The results showed as follows:(1) During the period of different salinity culture(from 60 d to 135 d),TP content fluctuated with increasing salinity,with the highest occurring in high salinity.ECT and TCT contents fluctuated under different salinity conditions with a consistent pattern.ECT contents were significantly higher than BCT contents.(2) At culture salinity of 15‰,the distribution of tannins in different parts of roots in the same period from 75 d to 135 d followed the identical pattern: the closer the root tip was,the higher the TP,ECT,BCT,and TCT contents were.福建省自然科学基金资助项目(B0410006);; 国家自然科学基金资助项目(40376026

Size Distribution of Particle and Polycyclic Aromatic Hydrocarbons in Particle Emissions from Simulated Emission Sources

采用再悬浮箱模拟得到不同粒径的烹调油烟、生物质和塑料燃烧烟尘、汽车尾气和发电机烟气等颗粒,并用gC/MS对不同粒径颗粒中18种多环芳烃(PAHS)进行了分析.结果表明,烹调油烟中颗粒物存在0.44~1.0μM和2.5~10μM两个峰值,稻草和木材燃烧排放烟尘只有0.44~1.0μM一个峰值,塑料燃烧排放烟尘的峰值不明显,汽车尾气尘因含有大量的水汽导致其粒径峰值出现在2.5~10μM,而发电机排放的烟尘约93%集中在≤2.5μM的粒径范围.烹调油烟和汽车尾气尘中低环数PAHS在2.5~10μM范围内的峰值明显;随环数增加,0.44~1.0μM范围内的峰值变得明显;不同排放源亚微米颗粒中单一PAH占全部颗粒态中该PAH的比例都呈现随分子量的增大而增大的趋势.烹调油烟和燃烧排放颗粒中PAHS的组成以菲占主导,但汽车尾气和发电机烟尘中含量最高的PAHS分别是萘和苯并[g,H,I]苝.来源特征比值的比较显示,烹调油烟与生物质燃烧颗粒中PAHS的源特征较为接近,但两者都不同于汽车尾气和发电机烟尘.Particles from cooking lampblack,biomass and plastics burning smoke,gasoline vehicular exhausts and gasoline generator exhausts were prepared in a resuspension test chamber and collected using a cascade MOUDI impactor.A total of 18 polycyclic aromatic hydrocarbons( PAHs) associated with particles were analyzed by GC-MS.The results showed that there were two peaks in the range of 0.44-1.0 μm and 2.5-10 μm for cooking lampblack,and only one peak in the range of 0.44-1.0 μm for straw and wood burning smoke.But there were no clear peak for plastics burning smoke.The peak for gasoline vehicular exhausts was found in the range of 2.5-10 μm due to the influence of water vapor associated with particles,while the particles from gasoline generator exhausts were mainly in the range of ≤2.5 μm( accounting for 93% of the total mass).The peak in 2.5-10 μm was clear for cooking lampblack and gasoline vehicular exhausts.The peak in the range of 0.44-1.0 μm became more and more apparent with the increase of PAHs molecular weight.The fraction of PAH on particles less than 1.0 μm to that on the total particles increased along with PAH's molecular weight.Phenanthrene was the dominant compound for cooking lampblack and combustion smoke,while gasoline vehicular exhausts and generator exhausts were characterized with significantly high levels of naphthalene and benzo[g,h,i]perylene, respectively.The distribution of source characteristic ratios indicated that PAHs from cooking lampblack and biomass burning were close and they were different from those of vehicular exhausts and generator exhausts.国家自然科学基金项目(40971257;41171365); 环境保护公益性行业科研专项(201009004

铯添加对VO_x/SBA-15催化剂丙烷氧化脱氢性能影响

我们考察了碱金属铯的添加对具有单一活性中心(分立的VO4四面体)的VOx/SBA-15催化剂上丙烷氧化脱氢反应性能的影响,发现铯的加入可以显著改善丙烯的选择性.在相同的丙烷转化率时,丙烯选择性提高了约10%.对催化剂的X射线衍射,拉曼光谱,程序升温还原,吡啶吸附IR光谱和程序升温脱附表征结果表明,少量碱金属的加入,并未改变活性中心的结构及其可还原性能,但明显降低了催化剂表面酸量,尤其是B酸量,从而有利于产物丙烯的脱附,抑制了深度氧化产物COx的产生,提高了丙烯的选择性

纪念五四宪法颁布暨全国人民代表大会成立五十周年理论研讨会纪要

今年 9月是五四宪法颁布、全国人民代表大会成立五十周年。五四宪法是新中国的第一部宪法 ,为我国的社会主义民主法制奠定了基础 ,具有划时代的意义。坚持和完善人民代表大会制度 ,是新的历史条件下推进政治体制改革和社会主义政治文明建设的重要内容。基于“以学术表达纪念、以纪念促进学术”的目的 ,中国社会科学院法学研究所于 2 0 0 4年 9月 5日举办了“纪念五四宪法颁布暨全国人民代表大会成立五十周年理论研讨会”。来自全国各地的 70余位代表莅临会议 ,研讨了诸多热点和前沿问题

三唑磷胁迫对美人蕉生长发育及生理生化的影响

研究了有机磷农药三唑磷对美人蕉生长发育及生理生化的影响,分析了美人蕉修复水体三唑磷污染的可行性.通过水培实验,探讨了不同浓度三唑磷对美人蕉根部超氧化物歧化酶、过氧化物酶活性、丙二醛、可溶性糖、叶片叶绿素含量、植株生物量、高度和根系发育的影响.结果表明,当三唑磷浓度10 mg.L-1时,美人蕉根部超氧化物歧化酶活性、过氧化物酶活性、根系发育和株高生长受到抑制,叶片叶绿素含量显著下降;当三唑磷浓度为39 mg.L-1时,植物生物量合成受到抑制.一般三唑磷的环境浓度低于1.0 mg.L-1,美人蕉的生长发育及

一种新型低耦合度3T1R非全对称并联机构的刚度性能分析

具有空间三平移一转动（3T1R）功能的并联机器人操作手，因其具有工作空间大、易实现高速、成本低等优点，在工业上获得广泛应用。针对作者提出的一种新型3T1R非全对称并联机构进行了刚度性能分析。首先，对该机构进行了拓扑结构的描述；其次，基于虚拟弹簧法建立了每条支链的刚度模型并求解其刚度矩阵；然后，对机构笛卡尔刚度矩阵中扭转刚度和线性刚度的变化趋势进行了分析，并讨论了冗余支链对整体刚度性能的影响；最后，结合ANSYS的有限元分析对该方法的计算数值进行了验证。研究结果为该并联机器人操作手的结构设计、样机研制奠定了基础