AsCl_3在9mol·L~(-1)盐酸一苯和水一苯相中分配比的测定

本文介绍了笔者设计的测定AsCL_3在9mol·L~(-1)盐酸—苯相的分配比(D_1)和在水—苯相中的分配比(D_2)的简便方法。试验测知,在19℃时,D_1为10.82,D2为0.0180。苯对9mol·L~(-1)盐酸中的As(Ⅲ)的萃取率为91.5％,水对苯相的As(Ⅲ)的反萃取率为98.2％(等体积一次萃取)。     

以社会模式的残疾观推进智障人士的社会融合

残疾观正在发生从医疗模式向社会模式的转变。社会模式的残疾观强调残疾问题是人权问题,也是社会和发展问题,主张以权利和支持作为处理残疾问题的方法。这一模式对智力障碍的认识更加客观,对智障人士的态度更为积极,关注权利、接纳、潜能和融合,可以作为智障人士社会融合的理论选择。智障人士社会融合的推进策略包括以宣传与沟通消除不健康的社会态度,以权利为本作为立法依据,以社会支持增强智障人士融入社会的能力等。     

试论高等学校教师应具备的基本条件和职业道德修养

作为一名高等学校教师，应具备的条件是：热爱教育，勇于奉献；严谨治学，提高教师水平；热爱学生，严格而科学地要求学生。同时，还要加强职业道德修养，为教育事业做出应有的贡献。     

李贽辞官的心路历程

李贽辞官。有一个长期的思想过程。但这一过程往往不为学者所注意，或被简单化了。李贽辞官的心路历程，被他自己和他的好友真实完全地记录下来，而本文只不过把这些记录顺序展示出来，就能让读者看出李贽辞官那曲折长久的过程了。     

Investigation on apoptosis of neuronal cells induced by Amyloid beta-Protein

Objective: To construct a PC12 cell strain with neuronal differentiation, and observe the apoptosis and pro-liferation activity effects induced these cells by Amyloid beta-Protein (Aβ-43). Methods: 1) PC12 cells in logarithmicgrowth phase were subcultured for 24 h. After the culture fluid was changed, the cells were treated with Rat-β-NGF andcultured for 9 days. 2) Neuronal differentiation of PC12 cells in logarithmic growth phase were divided into four groups:control group (0), experimental group (1), experimental group (2) and experimental group (3). The concentrations of Aβ inthe four groups were 0 μmol/L, 1.25 μ mol/L, 2.5 μ mol/L and 5 μmol/L, respectively. The cells were harvested at 24, 48 and72 h later and stained with AnnexinV-FITC/PI after centrifugation and washing. Then flow cytometry was conducted toexamine the apoptosis percentage. 3) NGF-induced PC12 cells were selected and Aβ with different concentrations wasadded. The final concentrations of Aβ were 0 μmol/L, 1.25 μmol/L, 2.5 μmol/L and 5 μ mol/L, respectively. After the cellswere incubated in an atmosphere of 5% CO2 at 37 ℃ in an incubator for 72 h, the OD values were examined. Results: 1)Neuronal differentiated PC 12 cell lines were successfully established. 2) Flow cytometric examination indicated that Aβ(1.25, 2.5, and 5.0 μmol/L) could effectively induce apoptosis of neuronal-differented cells at the 24 h, 48 h and 72 h timepoints. 3) Aβ (0-5.00 μ mol/L) had no obvious effect on proliferation or restraining of the neuronal differentiation of thePC 12 cells after a 72 h interacting process. Conclusion: This investigation revealed successful neuronal differentiation of thePC12 cell strain. The induction of apoptosis of the neurocytes by various concentrations of Aβ was observed and the in-fluence of Aβ on induced proliferation of PC 12 cells by Rat-β-NGF was revealed. This study -05 provide basis for futureresearch on the molecular cure of AD and interdiction of AD evolution.     

仙道小说中服食松柏成仙情节的现实背景

现实生活中,在灾荒之年,人们往往会以松柏为食充饥;而在传统医学文献中,松柏还有治病的功效。魏晋之际,道教迅速发展,贵族与平民分别在自己生活的基础上创造了一些食松柏而成仙的故事,食用松柏成为道教修道成仙的一种方法。     

Relationship between the size of pontocerebellar angle tumor and audiology

Objective: To study the relationship between the size of pontocerebellar angle tumor and audiology. Methods: Retrospective analysis of accoustically evoked brainstem response (ABR) waveforms and pure tone threshold in 27 subjects with tumor of pontocerebellar angle. Results: ABR wave forms and pure tone threshold were significantly affected statistically by the size of tumors, especially those tumor larger than 3 cm in diameter. Conclusion: The primary symptom of the patient was unilateral hearing loss. Early discovery of the lesion is important and ABR is a sensitive tool for early diagnose of the tumor.     

加入WTO后政府与民办高校的关系定位

中国加入WTO后,中国教育势必融入世界教育市场.这一形势对规范我国政府和民办高校的关系提出了严峻的挑战.本文针对目前我国民办高校面临的形势、我国政府和民办高校关系存在的问题,就政府与民办高校之间的关系定位进行探讨.     

否定系动词语法化分析

否定系动词“非”向焦点标记和副词的转化是汉语中非常独特的现象。这种变化首先作用于“非VP不vp”结构,然后在“不VP”结构进一步弱化的情况下催生了表示肯定语气的副词“非”。对这一现象的分析有助于解释语法化研究中的许多问题。