化学沉积法制备CdS纳米薄膜及成膜机理

分别以Cd(NO_{3)2和(NH2)2CS作为镉源和硫源, 用化学沉积法(CBD)在ITO玻璃上生长CdS半导体纳米薄膜. 考察了Cd^{２＋浓度、 沉积温度、 沉积时间和后处理温度对CdS成膜的影响. 紫外 可见吸收谱和原子力显微镜结果表明, 改变溶液浓度和后处理温度都能有效调节CdS的吸收带边, 得到均一致密的CdS纳米薄膜. 探讨了膜形成机理, 给出了成核过程模型, 进一步修正了传统成膜机制. 认为ITO玻璃基片表面活性位和晶核的形成是均一致密CdS纳米膜形成的关键. 晶核的形成是电学、 热学、 力学和化学等因素共同作用的结果.}}     

Dissection of the molecular mechanisms that control the nuclear accumulation of transport factors importin-α and CAS in stressed cells

The physiological state of eukaryotic cells controls nuclear trafficking of numerous cargos. For example, stress results in the inhibition of classical protein import, which is characterized by the redistribution of several transport factors. As such, importin-alpha and cellular apoptosis susceptibility protein (CAS) accumulate in nuclei of heat-shocked cells; however, the mechanisms underlying this relocation are not fully understood. We now show that heat upregulates the initial docking of importin-alpha at the nuclear envelope and stimulates the translocation of CAS into the nuclear interior. Moreover, heat exposure compromises the exit of importin-alpha from nuclei and drastically increases its retention in the nucleoplasm, whereas CAS nuclear exit and retention are less affected. Taken together, our results support the idea that heat shock regulates importin-alpha and CAS nuclear accumulation at several levels. The combination of different stress-induced changes leads to the nuclear concentration of both transport factors in heat-stressed cells.     

Nibbling within the nucleus: turnover of nuclear contents

As the site of gene expression and regulation, the nucleus is the control center of the cell. It might be thought that degradation of nuclear contents is strictly ‘off-limits,’ given the importance of the genetic information contained within the nucleus, but it has recently been reported that partial degradation of the nucleus may occur in yeast. Here we summarize the evidence for the degradation and quality control of proteins found with the nucleus and its compartments, and of nucleic acids that may occur under certain specific conditions. Only under certain special conditions such as differentiation of the lens are the entire nuclear contents degraded. Received 6 September 2006; received after revision 25 October 2006; accepted 13 December 2006     

Influence of atmospheric ice nucleus concentrations on cold cloud radiant properties and cold cloud reflectivity changes in past years

CLOUD CAN INFLUENCE GLOBAL RADIATIVE BALANCE TO A LARGE EXTENT.ITS RADIATIVE FORCING CAN BE VERY IMPORTANT TO GLOBAL CLIMATE CHANGE[1,2].CLOUD HAS BOTH UMBRELLA EFFECT AND WARM HOUSE EFFECT.NET RADIATIVE FORCING OF CLOUD IS THE COMBINATION OF THE TWO EFFE…     

碱性条件下芳环上碳代异戊烯基的方法研究

该文首次论述了在不同的碱性条件下芳环上碳代异戊烯基的方法，参考文献24篇。     

Temporal properties of pattern adaptation of relay cells in the lateral geniculate nucleus of cats

The temporal properties of pattern adaptation of relay cells induced by repeated sinusoidal drifting grating were investigated in the dorsal lateral geniculate nucleus (dLGN) of cats. The results showed that the response amplitude declined and the response latency prolonged when relay cells were pattern-adapted in dLGN, like the similar findings in visual cortex. However, in contrast to the result in cortex, the response phase of relay cells advanced. This implies that an inhibition with relatively long latency may participate in the pattern adaptation of dLGN cells and the adaptation in dLGN may be via a mechanism different from that of visual cortex.     

鸣禽前脑上纹状体腹侧尾核超微结构的观察

实验用鸟经脑灌流后于HVc处取材,用Epon 812包埋剂浸润包埋,经铀－铅电子染色后,H－600投射电镜下观察,IBAS图像分析集资进行处理,结果发现,鸣禽HVc核 的神经细胞以圆形,卵圆形为主,胞体体积无明显的种间差别,但雄鸟细胞比雄鸟大,HVc的突触连接以轴－树突触和轴－棘突触为常见,经统计学t检验HVc单位面积突触总数,I型和II型突触所占比较,棘突触所占比较的种间差异不显著（P＞0．05）,而性别差异显著（P＜0．05）,结果表明,鸣禽唯唱控制核团体积的性别差异不仅反映在显微水平,而且在亚显微水平亦表现出明显的性别二态性。     

中缝背核向大脑皮质的定位投射

目的 :研究RD向大脑皮质投射的范围、起源细胞的形态及其在核内的局部定位关系 .方法 :采用HRP逆轴突传递法对 2 5只猫RD向大脑皮质的投射进行了全面的观察 .结果 :①RD向除压上回和视区以外的大部分大脑皮质有着数量不等的纤维投射 ,但主要集中于前半皮质 ,其中向前乙状回的投射最为密集 .②起源细胞主要分布于RD的背侧部和腹侧部 ,背侧部以多极细胞为主 ,腹侧部多为梭形细胞 .③RD向压旁回 ,海马和膈区投射的起源细胞位于核的中、下段 ,而向其他皮质投射的起源细胞主要集中于核的中、上段 .结论 :RD向大脑皮质有着广泛的投射 ,这些投射的起源细胞在RD内具有明显的局部定位     

聚变-裂变能源混合堆可行性及在我国核能发展中作用的分析

简要论述了核能在我国能源发展战略中的地位及聚变－裂变混合堆在核能持续发展中的重要作用。对以不久将来即可实现的ITER聚变装置作驱动堆芯、天然铀水冷裂变系统作包层的混合堆做了细致的分析。这种混合堆型可以实现GWe级净电功率输出,年造钚1 656 kg,支持2.68个同功率压水堆电站对易裂变燃料的需要。初步的经济评估说明,混合堆电的成本是同功率压水堆电成本的1.67倍;而在不计燃料成本的情况下,混合堆与压水堆组合系统电的成本是同功率压水堆电成本的1.18倍。考虑到一般压水堆需消耗大量的天然铀,加上铀浓缩成本,混合堆与压水堆组合系统电的成本,与压水堆电的成本是可以相比拟的。