The etiology of mathematical self-evaluation and mathematics achievement: understanding the relationship using a cross-lagged twin study from age 9 to 12

The genetic and environmental origins of individual differences in mathematical self-evaluation over time and its association with later mathematics achievement were investigated in a UK sample of 2138 twin pairs at ages 9 and 12. Self-evaluation indexed how good children think they are at mathematical activities and how much they like those activities. Mathematics achievement was assessed by teachers based on UK National Curriculum standards. At both ages self-evaluation was approximately 40% heritable, with the rest of the variance explained by non-shared environment. The results also suggested moderate reciprocal associations between self-evaluation and mathematics achievement across time, with earlier self-evaluation predicting later performance and earlier performance predicting later self-evaluation. These cross-lagged relationships were genetically rather than environmentally mediated.     

浅析网络环境下高职院校的学生思想政治教育

网络技术的迅猛发展对高职院校的思想政治教育工作产生了强烈的＂双刃剑＂效应。面对高职院校网络思想政治教育人才缺乏、投入不足,造成高职院校在基础理论研究滞后、技术应用不够充分、内容和形式的创新不够等问题,高职院校思想政治教育工作者必须抓住机遇,大胆创新,力求实效,努力开创高校思想政治教育工作的新局面。     

歧视知觉比贫困更值得关注——从两者对贫困与非贫困儿童行为的影响来谈

为了考察贫困和歧视知觉对儿童亲社会行为和问题行为的影响,采用问卷调查方式,测查了北京、天津、洛阳和南阳四个城市20多所学校的2670名5-8年级儿童,考察其物质资源、所拥有的教育资源,歧视知觉及亲社会行为和问题行为.结果发现:(1)贫困家庭儿童的物质资源指数、教育资源指数显著低于非贫困组,歧视知觉显著高于非贫困组;(2)贫困组儿童的亲社会行为显著低于非贫困组,而问题行为显著高于非贫困组.(3)在贫困与非贫困家庭中,歧视知觉对儿童亲社会行为和问题行为均有显著的预测作用,随着经济状况的改善,歧视知觉对问题行为的预测更大.结果说明,歧视知觉比贫困更值得关注,可以为贫困生心理健康教育提供一定的参考.     

从农村职业教育视角论新型农民培养

21世纪初,我国农民整体素质有了明显提高,但与有文化、懂技术、会经营的新型农民之间不存在着很大差距。本文从分析农村劳动力整体状况着手,探讨农村职业教育在培养新型农民过程中的作用,提出了大力发展农村职业教育培养新型农民的几点对策建议。     

汉康液的抗氧化作用及对SOD活力的影响

小鼠给予汉康液2.0g/kg/日,连续灌胃22天,结果表明该液能明显降低小鼠血清中丙二醛(MDA)含量,并对血清超氧化物歧化酶(SOD)活性有显著增强作用。     

突出"课程"要素保障教学质量——华威大学教学质量内部保障体系研究

华威大学是一所在短时间内迅速崛起的新大学,它的成功与其教学质量内部保障体系关系密切.本文在对华威大学教学质量保障体系的目标、组织构架、保障方法等进行分析的基础上,总结出其教学质量保障体系的几个突出特点:切合实际的质量目标、高效的组织结构、紧紧围绕"课程"保障教学质量的方法,并将这种突出强调"课程"要素的质量保障体系归纳为"课程型"质量保障模式.     

短小芽孢杆菌β-内酰胺酶基因的克隆

以质粒pSC101为载体,用鸟枪法将短小芽孢杆菌A3染色体的β—内酰胺酶基因,克隆至大肠杆菌HB101。经质粒检测及酶切电泳分析证明,克隆的β—内酰胺酶基因位于2.6kb的EcoRI片段上,将此片段连接到质粒PAL32转化枯草杆菌,亦能表达并向胞外分泌β—内酰胺酶。     

试析分组分享法在高职思政课教学过程中的实践价值

从高职学生学情的特点和对思想政治理论课的整体认知出发,在教学过程中采用分组分享法不仅有利于提高思想政治理论课的教学效果,更有利于促进学生以课堂为平台进行能力的培养和锻炼,是在遵循教育教学规律和学生学习成长规律前提下的有益尝试,具有较高的教学实践价值。     

怎样发挥师专图书馆的教育职能

作者从五个方面分别论述了师专图书馆教育职能的含义、师专图书馆在师生读者中怎样发挥教育职能等问题,同时提出:一定的物质基础和科学的管理手段是师专图书馆教育职能得以充分发挥的有力保障。     

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.