中草药综合开发利用的横向意义

本文从“变废为宝”“亦药亦蔬”“杀虫农药”三个方面论述了中草药的综合开发前景广阔,大有可为。“变废为宝”举例说明了中草药的药用部位可以扩大,充分利用中药材资源。“亦药亦蔬”,说明了中草药作保健食品俯拾皆是。“杀虫农药”以实例说明中药不仅用来治疗人、畜疾病,也可作农药用于植物。     

分光光度法测定食品和水中钙

本文用分光光度法测定食品和水中钙的含量.在硝酸介质中,钙与二溴对甲偶氮磺形成蓝色的络合物,其最大吸收波长在628nm处,表观摩尔吸光系数为5.5×104L.mol-1.cm-1.钙量在0-12ug/ 25ml范围内符合比尔定律,方法有很好的选择性,直接用于测定花生、奶粉、水中钙的含量.     

Pedagogical Agents as Learning Companions: The Role of Agent Competency and Type of Interaction

This study was designed to examine the effects of the competency (low vs. high) and interaction type (proactive vs. responsive) of pedagogical agents as learning companions (PALs) on learning, self-efficacy, and attitudes. Participants were 72 undergraduates in an introductory computer-literacy course who were randomly assigned to one of four treatments: Low-Proactive, Low-Responsive, High-Proactive, and High-Responsive. Results indicated a main effect for PAL competency. Students who worked with the high-competency PAL in both proactive and responsive conditions achieved higher scores in applying what they had learned and showed more positive attitudes toward the PAL. However, students who worked with the low-competency PAL reported significantly enhanced self-efficacy beliefs in the learning tasks. Also, there was a main effect far PAL interaction type. A proactive PAL had a significantly positive impact on recall. These different results on learning and motivational outcomes suggest that the competency and interaction type of a PAL should be designed according to the desired learning and motivational goals.     

铝的生物毒性作用及食品卫生

本文综述铝在人体内的代谢、生物毒性作用及其食品卫生状况。     

互联网融合下的“启发—参与式”理念在临床营养教学中的运用

长期以来,医学高校的营养与食品卫生学教学,尤其是临床营养教学存在理论和实践脱节的问题。文章通过原因分析,借助现有教学经验,把基于互联网平台应用的启发式与参与式教学模式融入临床营养教学实践,为培养营养与食品卫生学专业的复合型人才提供新的思路。     

《功能性食品加工技术》课程改革的实践

通过对《功能性食品加工技术》课程教学内容、教学方法、考核方式等的全面改革实践,提出追踪行业技术前沿调整教学内容,模拟企业管理形式进行教学组织,贯穿教学全过程进行考核的教学模式是调动学生学习主动性,提高综合职业素质的有效途径。     

Domain Coloring and the Argument Principle

Abstract

The domain-coloring algorithm allows us to visualize complex-valued functions on the plane in a single image—an alternative to before-and-after mapping diagrams. It helps us see when a function is analytic and aids in understanding contour integrals. The culmination of this article is a visual discovery and subsequent proof of the Argument Principle, which relates the count of poles and zeros of a meromorphic function inside a contour to the accumulated change in argument of the function around the contour. Throughout, I offer connections to standard learning goals of courses in complex variables.     

论英语词汇的文化色彩

词汇是语言的基本组成部分之一,是语言中最活跃的因素,也是民族文化语言形式折射后的焦点,它能够最大限度、最直接、最敏感、最迅速地反映人类社会生活的文化镜像。本文通过阐述历史发展、地理环境、宗教信仰、政治文化、寓言神话对英语词汇的影响,揭示英语词汇丰富的文化色彩及英语词汇教与学的趣味性、有效性。     

"公司加农户"模式的运行缺陷与食品安全

近年来,我国的食品安全问题日益严重,已引起国家和整个社会的高度重视,众多专家、学者也对此进行了较为深入的研究和探讨,但其视角主要集中在质量检测和打击各类非法经营等食品安全管理方面,对作为食品主要原材料的农产品生产的安全性研究相对较少。然而,在对食品安全问题的讨论中,农产品生产过程的安全性是不容忽视的。     

辐照板鸭产生异味的初步研究

采用辐射贮存肉类,剂量较高时会产生辐射异味.研究表明:板鸭辐射味随剂量的增加而加强,当剂量超过5kGy时,即引起较强的辐射味.辐射味主要来源于板鸭肌肉蛋白,特别是其中的水溶性蛋白质部分;辐射味与羰基化合物、挥发性含硫化合物及胺等有关,其含量随剂量的加大而增加.辐射产生了两种新羰基化合物(R_f值分别为0.23和0.28)及一种挥发性胺——丙胺.