介孔碳负载钯催化剂的制备及其对 Sonogashira 偶联反应的催化性能研究磁

通过简单方法合成了介孔碳负载钯催化剂,考察了该催化剂对Sonogahsira反应的催化效果,并优化了反应条件。     

植物保护专业《农药残留分析》课程实验教学方法初探

农药残留分析技术在保障公众舌尖上的安全中发挥着极其重要的作用,《农药残留分析》是植物保护专业的必修课程之一,本文将从农药残留分析实验教学的重要性、趣味性、实用性、时效性、主观能动性及课程的设置等方面初步探讨该课程的教学方法,旨在使学生在全面掌握该课程理论知识的基础上增强专业技能。     

优化高校师资队伍推进教师聘任和职务晋升制度改革

文章结合北京大学的教师聘任和职务晋升规定,介绍医学部在优化师资队伍,推进教师聘任和职务晋升制度改革方面的措施及取得的成效和存在的不足。同时提出了今后教师聘任制改革的设想,旨在"抛砖引玉",供各位同行研究和探讨。     

潮州筝曲诸调特点及演奏风格刍议

潮州筝曲具有独特的艺术魅力,它的调性、调式概念不同于其他民族调式和西洋调式。除了板数和骨干音的一致外,演奏者可以应用“造句”的方式,演奏潮州筝曲。所以必须了解潮乐诸调音乐特点,诸调弹奏风格,才能形成潮州筝曲流畅华丽而旖旎迷人的曲调风韵。     

Which is more influential on teaching practice,classroom management efficacy or instruction efficacy? Evidence from TALIS 2018

Asia Pacific Education Review - This study aims to explore relationship between teacher self-efficacy and teacher teaching practice in junior high schools at Taiwan. TALIS (2018) survey database is...     

现代教育的重要性与一流人才的培养

一种教育方式注定只适合培养一类人；一种评价体制注定只让一部分人“脱颖而出”：一种教育理念必定会扼杀一部分天才。教育应当是全方位的，不可忽视学习者的多元智能，否则教育就是在生产偏瘫产品。     

A Model for Developing and Testing Custom-Made Laboratory Manuals to Use with Food Chemistry and Food Analysis Courses

ABSTRACT: This project reports on a model for preparing food chemistry and food analysis laboratory manuals that provide a closer link between lecture material and laboratory exercises. Teaching effectiveness was also improved by evaluating the composition and eliminating duplication between these complementary courses. Utilizing the combination of personal experience and the scientific literature, laboratory exercises were developed and modified to fit with the lecture material. Labs were initially performed and critiqued by a graduate student. After making appropriate revisions, undergraduate students tested the labs under the graduate student's supervision and completed a questionnaire about their experiences. Based on the undergraduate feed-back, final revisions were made and custom laboratory manuals were printed. This project demonstrates one effective way for developing custom food science labs to parallel with lecture material.     

Green tea polyphenols induce cell death in breast cancer MCF-7 cells through induction of cell cycle arrest and mitochondrial-mediated apoptosis

In order to study the molecular mechanisms of green tea polyphenols (GTPs) in treatment or prevention of breast cancer, the cytotoxic effects of GTPs on five human cell lines (MCF-7, A549, Hela, PC3, and HepG2 cells) were determined and the antitumor mechanisms of GTPs in MCF-7 cells were analyzed. The results showed that GTPs exhibited a broad spectrum of inhibition against the detected cancer cell lines, particularly the MCF-7 cells. Studies on the mechanisms revealed that the main modes of cell death induced by GTPs were cell cycle arrest and mitochondrialmediated apoptosis. Flow cytometric analysis showed that GTPs mediated cell cycle arrest at both G1/M and G2/M transitions. GTP dose dependently led to apoptosis of MCF-7 cells via the mitochondrial pathways, as evidenced by induction of chromatin condensation, reduction of mitochondrial membrane potential (ΔΨm), improvement in the generation of reactive oxygen species (ROS), induction of DNA fragmentation, and activations of caspase-3 and caspase-9 in the present paper.     

Exploring the role of flow experience,learning performance and potential behavior clusters in elementary students' game-based learning

Well-designed game-based learning can provide students with an innovative environment that may enhance students' motivation and engagement in learning and thus improve their learning performance. The purpose of this study was to examine the relationships among elementary school students' flow experience and learning performances. We also investigated the gender and grade differences as well as the types of potential clusters of flow experiences and performance. Thirty-four elementary school students participated in this study. This study conducted correction analysis, difference analysis and a two-stage cluster analysis. The findings suggested that the students with higher flow experiences tended to have higher learning performances. The results of gender differences showed that female students had high performance scores and great flow experiences in the mini-educational game in this study. Moreover, the results revealed that the students of higher grade had significantly higher scores in both performance and flow experience than the students of lower grade. The result of cluster analysis fell into three categories: low performance/low flow experience students, high flow experience students and high performance/high flow experience students. On the basis of our findings, we also proposed suggestions for future game-based learning research.