Response of seed tocopherols in oilseed rape to nitrogen fertilizer sources and application rates简

Tocopherols (Tocs) are vital scavengers of reactive oxygen species (ROS) and important seed oil quality indicators. Nitrogen (N) is one of the most important fertilizers in promoting biomass and grain yield in crop production. However, the effect of different sources and application rates of N on seed Toc contents in oilseed rape is poorly understood. In this study, pot trials were conducted to evaluate the effect of two sources of N fertilizer (urea and ammonium nitrate). Each source was applied to five oilseed rape genotypes (Zheshuang 72, Jiu-Er-1358, Zheshuang 758, Shiralee, and Pakola) at three different application rates (0.41 g/pot (N1), 0.81 g/pot (N2), and 1.20 g/pot (N3)). Results indicated that urea increased α-, γ-, and total Toc (T-Toc) more than did ammonium nitrate. N3 was proven as the most efficient application rate, which yielded high contents of γ-Toc and T-Toc. Highly significant correlations were observed between Toc isomers, T-Toc, and α-/γ-Toc ratio. These results clearly demonstrate that N sources and application rates significantly affect seed Toc contents in oilseed rape.     

在线自学与考试系统的设计

本文将现有的在线自学与在线考试系统相结合,设计出一个具备教学与测试的完整的学习系统,并实现学习者学习进度记录、进度相互比较及经验交流等功能,使学习者在学习过程中并不孤独。     

Cyber Bullying @ Schools: What do Turkish Adolescents Think?

Cyber bullying is an emerging form of peer bullying, becoming prominent especially over the past decade. The aim of this study was to investigate through interviews the perceptions of Turkish high school students about cyber bullying. The sample consisted of six male and one female high school students all aged 15 years who identified as being active in cyber bullying. Findings were grouped under four main headings; acts of cyber bullying, reasons for cyber bullying, characteristics of cyber bullies and victims, and suggestions to prevent cyber bullying. The results were discussed in the light of relevant literature.     

河北医药制造企业联合采购的实施

河北医药制造企业实施联合采购,能有效降低企业采购成本、提升利润空间。就联合采购实施的优势、模式以及需要解决等问题进行探讨。     

Exploring relationships among TPACK constructs and ICT achievement among trainee teachers

Teaching in the classroom today can no longer sustain the interest of students and be effective if the process involves traditional approach - teachers as sole provider of content information. In recent years technology has played a significant role in transforming education to more progressive and interactive activities. However the use of technology itself does not produce positive results in quality of learning and students’ achievement. Teachers must be competent in subject knowledge, pedagogical skills and technological know-how. The Technological Pedagogical Content Knowledge or TPACK as a conceptual framework can guide teachers to understand the complex relations between the six components of the model. There has been numerous studies on TPACK in international contexts beyond cultural and language boundaries. This paper examined recent studies on TPACK in various countries and reports findings from a study conducted with student teachers in the UAE.     

我国单板滑雪U型项目运动员人格、赛前情绪的类型及关系研究

探讨我国单板U型滑雪运动员人格和赛前情绪类型的基本特点及其关系,采用卡特尔16种人格因素量表和赛前情绪量表–T,对我国43名运动员进行调查,结果显示:(1)运动员的人格类型主要有普通型、兴奋敢为型和敏感紧张型。运动员的赛前情绪类型主要有混合型、自信型和淡漠型。地方队的混合型和淡漠型运动员显著多于国家队。赛前情绪为混合型的运动员没有取得过国际名次,自信型运动员取得的国际名次最多。(2)普通型和敏感紧张型运动员的个体失败焦虑显著高于兴奋敢为型运动员;敏感紧张型运动员的社会期待焦虑显著高于兴奋敢为型运动员。(3)从个案看:该项目优秀运动员大多属于兴奋敢为型和自信型运动员。结论:兴奋敢为型和自信型的单板滑雪U型项目运动员焦虑更少、成绩更好、更易成功。