媒体融合背景下高校学生记者队伍培养策略

媒体融合发展是高校开展新闻宣传工作的必然要求，针对高校学生记者队伍建设中存在的问题，提出要以“选修课+线上学习资源+校内培训”为抓手，学习相关专业学科知识；以学校融媒体中心为基础，为学生记者提供实践平台；深化学生记者对媒体融合传播理念的认识，不断提升互联网思维和创新能力。     

野菊茎叶多糖微波辅助法提取工艺及抗氧化活性研究

以野菊茎叶为原料,经脱色脱脂后用微波辅助法提取野菊茎叶中的多糖,用苯酚-硫酸法测定多糖的提取量。以料液比、提取温度、提取时间和微波功率为自变量,设计正交试验确定野菊茎叶多糖的最佳提取工艺条件,并通过Fenton体系和DPPH体系测试野菊茎叶多糖的抗氧化活性。结果表明,在料液比1:40(g/mL)、提取温度80℃、提取时间10min、微波功率450 W的条件下野菊茎叶多糖的提取量高达6.32%,微波辅助能快速提取野菊茎叶中的多糖,提取效果显著;野菊茎叶多糖对·OH和DPPH·有清除作用且存在着量效关系,野菊茎叶多糖具有抗氧化活性。     

北京中学生营养知识现况及其影响因素分析

目的:了解北京市中学生营养知识掌握现况并探讨影响因素。方法:采用整群典型抽样,抽取北京核心城区和郊县城区数所代表性中学学生,开展现场问卷调查。结果:北京市6所中学1192名学生参与问卷调查,其中初中生789人、高中生392人,男生600人(50.80%)、女生581人(49.20%),平均年龄13.72±1.58岁(最小11岁、最大19岁);中学生营养知识平均得分为59.37,初中生59.78,高中生58.53;女生61.08,男生57.71;学生对不同类别营养知识的知晓率差异显著(P<0.05);女性学生、与父母同住、父母学历高与学生营养知识得分存在正相关关系。结论:北京市中学生营养知识得分处于不及格水平,对不同知识类别的知晓度差异显著,学生在初高中阶段学习和掌握营养知识缺乏系统连贯性。学校课程设置、年级、性别、父母学历、居住状况等影响学生营养知识掌握状况。学校应考虑家庭和社会参与,衔接初高中阶段课程教学,加强系统、综合和连贯性的学生营养教育。     

Lecture capture with real‐time rearrangement of visual elements: impact on student performance

The primary goal of this study is to create and test a lecture‐capture system that can rearrange visual elements while recording is still taking place, in such a way that student performance can be positively influenced. The system we have devised is capable of integrating and rearranging multimedia sources, including learning content, the instructor and students' images, into lecture videos that are embedded in a website for students to review after school. The present study employed a two‐group experimental design, with 153 participants (145 females and 8 males) making up an experimental group in which lecture courses were recorded using the new lecture‐capture system, and 149 participants (140 females and 9 males) forming a control group whose lectures were recorded by traditional means. All participants were in the freshman college and studying Introduction to Computer and Information Science in one of six classes, and were randomly assigned to one of the two groups. The participants' midterm examination and final examination scores were collected as indicators of their academic performance, with their mathematics entrance scores used as a pre‐test. The findings obtained from analysis of covariance (ANCOVA) suggest that appropriate rearrangement of visual elements in lecture videos can significantly impact students' learning performance.     

Teaching and Learning Electrochemistry

Numerous conceptual difficulties and misconceptions have been reported in the science and chemistry education literature about electrochemistry concepts such as electrolytes, redox equations, and about electrochemical (galvanic and electrolytic) cells. Other studies have considered teaching approaches aimed at improving learning and at overcoming misconceptions. This paper reviews these studies and considers strategies and approaches for the effective teaching of electrochemistry. Then, the review focuses on problem solving in equilibrium electrochemistry, especially problems involving the Nernst equation. The main findings of four studies with Greek university chemistry students, dealing with: (i) algorithmic problem‐solving ability; (ii) practice on problem solving; (iii) the effect of the format of a problem; and (iv) the construction and evaluation of a website devoted to electrochemistry problem solving, are reported.     

信息化背景下《化工原理》模块化教学的实践探索

通过构建《化工原理》模块化课程体系,借助信息化教学手段和资源,采用"理—虚—实"模块化教学模式实施教学过程,有效解决了高职院校生源结构发生变化之后,《化工原理》课程理论和实践分步实施过程中存在的问题,提升了课堂的教学质量,强化了学生的基本理论知识,也增强了学生的实践能力。     

引导部分本科生较早进入科研工作刍议

文章从引导部分本科生较早进入科研工作的必要性、方法和应注意的问题几个方面进行了讨论。作者认为,引导部分本科生在大学二年级后即逐步进入科研工作,有利于从本科生中培养科研尖子,从而提高全体学生在大学四年级进行毕业论文或设计工作时的水平,符合素质教育的要求。     

化学工程领域全日制专业学位研究生实践能力培养的研究

实践性是全日制专业学位研究生教育的基本特点。结合本校现阶段化学工程领域全日制专业学位研究生培养中存在的问题,从专业课程教学改革与实践、发展和完善相对开放的实验体系以及提高指导教师自身素质等方面,探讨了化工类专业学位研究生实践能力培养模式的构建。     

皖南红豆杉枝叶中总黄酮抗肿瘤活性研究

以MTT法考察皖南红豆杉枝叶中总黄酮的体外抗肿瘤活性;以小鼠移植瘤模型测定总黄酮对荷瘤小鼠抑瘤率和腹腔巨噬细胞吞噬能力,研究其体内抗肿瘤活性和免疫调节作用。结果表明,总黄酮对S180细胞生长有显著抑制作用,呈现剂量依赖关系。体内试验表明,与生理盐水组相比,总黄酮对小鼠S180实体瘤有显著抑制作用（P〈0.01）,可提高荷瘤小鼠的脾指数。与环磷酰胺组相比,总黄酮可使荷S180实体瘤小鼠腹腔巨噬细胞吞噬能力显著升高（P〈0.01）,提示其对小鼠无免疫抑制作用。