排序方式: 共有137条查询结果,搜索用时 15 毫秒
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GUO Xing-gang DONG Xin-shu CHEN Jie The Affiliated Tumor Hospital of Harbin Medical University Harbin P. R. China 《高等学校化学研究》2009,25(2)
To explore the functional mechanism of tetraarsenic tetrasulfide(As4S4)against the growth and proliferation of colon cancer cells ls174t,MTT method was used to observe the functions of tetraarsenic tetrasulfide for the inhibition of cells ls174t in vitro.Transmission electron microscope was used to observe cell morphologies.FCM assay was performed to measure the change of cell cycle.RT-PCR method was used to detect the expressions of bcl-2 and bax mRNA.Westernblot method was used to detect the expressions of bcl-2 and bax protein.Tetraarsenic tetrasulfide showed an inhibiting effect on the proliferation of cells ls174t in vitro(P<0.01).It induces the apoptosis of cells ls174t,which is related to the decrease in the expression of bcl-2 and the increase in the expression of bax. 相似文献
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通过Langmuir Blodgett技术制备了酞菁铜 氧化铁纳米粒子交替LB膜 ,利用偏振紫外 可见光谱对酞菁铜衍生物在不同制膜条件下所制得的交替膜中的分子取向进行了研究。结果表明 ,在同一氧化铁溶胶亚相中 ,随着表面压的增大 ,或在相同的表面压下 ,随着亚相中氧化铁浓度的减小 ,酞菁铜分子在其复合LB膜中倾斜程度变大。 相似文献
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YANG LuQing SHANG Yan ZHANG Hui SUN Miao LIU Bo & ZHANG GuiLing Key Laboratory of Green Chemical Technology of College of Heilongjiang Province College of Chemical Environmental Engineering Harbin University of Science Technology Harbin China 《中国科学B辑(英文版)》2011,(6)
The charge-doping effect on the geometric and the electronic structures of organosilicon oligomers nSix(C=C)+y has been studied using density functional theory. Charge-doping can significantly lower the excitation energies. Interchain hole hopping mainly occurs between the π-conjugated units. A doped nSix(C=C)+y oligomer can undergo a structural rearrangement. The simulated UV/vis absorption peak of the rearranged structure is located at higher energy than the non-rearranged one. The hole transfer rate is s... 相似文献
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为了提高饮用水处理系统对病毒的去除效果,本研究采用静态实验,研究纳米TiO2对模型病毒—f2噬菌体的吸附去除特性,系统考察TiO2投加浓度、病毒浓度、温度及pH值等因素对吸附效果的影响.实验结果表明:f2噬菌体在纳米TiO2表面的吸附符合准二级吸附动力学模型,遵循化学吸附机理,颗粒内扩散为该吸附过程中的速率控制步骤,但不是唯一控制步骤;纳米TiO2对f2噬菌体的吸附符合Freundlich等温吸附模型(qe=27.4Ce1.24),属于多层吸附类型;在20~40℃范围内,温度对纳米TiO2的吸附性能影响不大,而酸性条件下更有利于纳米TiO2对f2噬菌体的吸附. 相似文献
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刘亚成 《新疆大学学报(理工版)》1992,(2)
本文用Galerkin方法与能量估计研究方程u_u=u_(zat)+σ(u_z)_z含第二类边界条件的初边值问题。设σ∈c~1,σ~1(s)下方有界,得到整体强解的存在唯一性;若σ(s)及初始函数还适当光滑且σ~(21)(0)=0,i=1,2,…,某个n,则得到强解相应的光滑性;最后讨论了解的渐近性质及其物理意义。 相似文献
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ZHAO Hui LI Qiang & SUN LiPing Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education School of Chemistry Materials Science Heilongjiang University Harbin China 《中国科学B辑(英文版)》2011,(6)
One of the major challenges to develop intermediate temperature solid oxide fuel cells is finding a novel cathode material, which can meet the following requirements: (1) high electronic conductivity; (2) chemical compatibility with the electrolyte; (3) a matched thermal expansion coefficient (TEC); (4) stability in a wide range of oxygen partial pressure; and (5) high catalytic activity for the oxygen reduction reaction (ORR). In this short review, a survey of these requirements for K2NiF4-type material wi... 相似文献
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1引言所谓MEG(脑磁图)反源问题,就是根据头外电磁场数据确定脑内神经电流源的活动情况.此类反问题在生物医学中有着广泛的应用,其最经典的一个应用即利用脑磁图仪器确定癫痫病人脑部病灶的位置.癫痫是由脑部神经元群阵发性异常放电所致,这些神经元群的体积一般都很小,因而可以被近似看作是偶极子源[1,6].本文即是考虑由此衍生的反 相似文献
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对激光二极管端面抽运 (Tm ,Ho)∶YLF固体激光器的激光特性进行了研究。根据激光二极管抽运准三能级系统的特性 ,详尽地分析了能量在Tm3 + 离子和Ho3 + 离子之间的传递过程 ,给出了 (Tm ,Ho)∶YLF激光器准三能级的速率方程 ,对上转换及激光下能级粒子再吸收对激光二极管抽运 (Tm ,Ho)∶YLF激光器运转的影响进行了理论分析 ,得出了 (Tm ,Ho)∶YLF激光器的阈值抽运功率和斜率效率的解析表达式。同时对 (Tm ,Ho)∶YLF微片激光器的激光特性进行了实验研究 ,当保持晶体温度为 19℃时 ,阈值抽运功率为 4 2 5mW ,斜率效率为 2 2 .5 % ,最大光光转换效率为 17.4 % ,并且在将晶体保持在四个不同的温度下 ,给出了激光输出功率随抽运功率变化的实验结果。将理论与实验结果进行比较 ,发现吻合得比较好。 相似文献