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关键词： 虚拟教学   食品分析   传统教学   虚拟仿真实验  

摘要： 食品分析是一门结合化学物理生物等学科的多课程交叉学科，理论知识晦涩难懂，对高精密度大型仪器操作有一定要求，传统的教学模式已经无法满足当代社会的技术要求。为提升学生的应用技术能力，提高教学质量，本文讨论传统教育在现代食品分析教学现状中存在的弊端，主要探索虚拟教学模式的可行性及优势。改变食品分析专业学生“分析难、实验怕、化学差”的现状，以满足社会对食品分析人才的需求。

关键词： 混合式教学   翻转课堂   生物化学   金课  

摘要： 为了提升混合式教学质量,教育部提出建设6 000门线上线下混合式"金课"。翻转课堂是衔接线上线下混合式教学的重要纽带,它颠覆了传统课堂教学中"老师讲→学生听"的模式,体现了以"学生为中心"的教学理念。根据"金课"建设标准,生物化学混合式教学通过重新建构翻转课堂教学模式,综合设计与分层教学,努力解决生物化学课程教学中的短板、瓶颈、关键问题,真正提升学生自主建构意识和信息处理能力,让学生在思辨与探讨中深度学习,建构适合自己的更完善的专业知识框架。

关键词： 线上教学   生物化学   翻转课堂   等效实质  

摘要： 随着“互联网+”的快速发展,线上教学已经成为大学教育的方向,2020年突发的疫情对高校教育工作者提出了挑战,也促进了线上教学探索和发展。本文以郑州大学生命科学学院生物化学课程为例,介绍疫情期间如何应对突发状况,做好统筹规划和预案,优化资源并筛选平台,灵活调整授课方式,及时测评与总结,即“筹、选、教、评”四步走法,调动学生积极主动性,实现以学生为主体的网上授课。该方法保障了线上教学和线下教学等效实质的教学效果,以期为今后的线上教学或混合式教学提供借鉴和参考。

关键词： 食品分析与检验   课程思政   融合教学   德育教育   思政元素  

摘要： 本文阐述将思想政治教育融入"食品分析与检验"课程的途径,提出提升教师德育能力、挖掘课程的思政元素、灵活使用教学手段、完善教学考核模式等实施途径.

关键词： 混合式教学   生物化学   高职护理  

摘要： 为探讨混合式教学方法在高职护理生物化学中的教学效果,本研究选取2019级高职护理1904班(39人)和1905班(37人) 2个班级学生作为混合式教学组,2018级高职护理1809班(43人)和1810班(42人) 2个班级学生作为传统教学组,对比两组学生的教学效果。研究结果表明,混合式教学组学生的实验成绩和理论成绩均明显优于传统教学组,差异均有统计学意义(P<0.05)。混合式教学方法有利于提高学生的学习积极性、综合能力和提高教师的教学水平。

关键词： 食品分析   全实验教学   粮油食品特色  

摘要： 讨论了食品分析实验教学中存在的问题,并对传统的食品分析实验教学模式进行探讨,阐述了食品分析实验教学改革的必要性,提出从优化实验教学内容、试行全实验教学方法、实行多元化的考核评价等方面进行探索,在食品专业人才的培养方案上结合江苏高校优势学科建设的优势进行制定,突出粮油食品特色,将教学和科研有机结合起来,把科研成果引入课堂教学中,旨在培养具有粮油食品特色的专业创新实用型人才。

关键词： Cellulophaga baltica   iota-Carrageenase   Biochemical characterization   KAPPA-CARRAGEENASE   SULFATED POLYSACCHARIDES   GLYCOSIDE HYDROLASES   IN-VITRO   PART I   CLONING   FAMILY   OLIGOSACCHARIDES   DEGRADATION   HYDROLYSIS  

摘要： The iota-carrageenan degrading marine bacterium, Cellulophaga baltica, was isolated from the surface of a filamentous red alga Vertebrata fucoides. Maximum iota-carrageenase production was optimized by single-factor experiments. Optimal fermentation conditions were 1.6 g/L furcellaran, 4 g/L yeast extract as carbon sources, 5 g/L sea salt, and 48 h of incubation time at 20 degrees C. Extracellular iota-carrageenase from the culture supernatant was purified by ultrafiltration, ammonium sulfate precipitation, and finally by anion-exchange chromatography, showed a 26-fold increase in specific activity as compared to that in the crude enzyme. According to the results from SDS-PAGE and HPLC-SEC, the molecular weight of the purified enzyme was estimated to be 31 kDa. The purified enzyme showed the maximum specific activity of 571 U/mg at 40 degrees C and pH 7.5-8.0. It maintained 73% of the total activity below 40 degrees C and 90% of its total activity at pH 7.2. Notably, the enzyme is a cold-adapted iota-carrageenase, which showed 33.4% of the maximum activity at 10 degrees C. The enzyme was stimulated by Na+, K+, and NH4+, whereas Ca2+, Mg2+, Fe3+, sea salt, and EDTA acted as enzyme inhibitors. (C) 2020 Elsevier B.V. All rights reserved.

关键词： Agronomic biofortification   Antioxidant metabolism   Vigna unguiculata   X-ray fluorescence microscopy   Scanning electron microscopy   Selenium   AGRONOMIC BIOFORTIFICATION   AMINO-ACIDS   GROWTH   STRESS   RICE   METABOLISM   MECHANISMS   RADIATION   MANGANESE   TOXICITY  

摘要： Low concentrations of selenium (Se) are beneficial for plant growth. Foliar Se application at high concentrations is toxic to plants due to the formation of reactive oxygen species (ROS). This study characterized Se toxicity symptoms using X-ray fluorescence (XRF) technique in response to foliar Se application in cowpea plants. Five Se concentrations (0, 10, 25, 50, 100 e 150 g ha(-1)) were sprayed on leaves as sodium selenate. The visual symptoms of Se toxicity in cowpea leaves were separated into two stages: I) necrotic points with an irregular distribution and internerval chlorosis at the leaf limb border (50-100 g ha(-1)); II) total chlorosis with the formation of dark brown necrotic lesions (150 g ha(-1)). Foliar Se application at 50 g ha(-1) increased photosynthetic pigments and yield. Ultrastructural analyses showed that Se foliar application above 50 g ha(-1) disarranged the upper epidermis of cowpea leaves. Furthermore, Se application above 100 g ha(-1) significantly increased the hydrogen peroxide concentration and lipid peroxidation inducing necrotic leaf lesions. Mapping of the elements in leaves using the XRF revealed high Se intensity, specifically in leaf necrotic lesions accompanied by calcium (Ca) as a possible attenuating mechanism of plant stress. The distribution of Se intensities in the seeds was homogeneous, without specific accumulation sites. Phosphorus (P) and sulfur (S) were found primarily located in the embryonic region. Understanding the factors involved in Se accumulation and its interaction with Ca support new preventive measurement technologies to prevent Se toxicity in plants.

关键词： 食品安全   生物学教学   生物学课堂  

摘要： 民以食为安,食以安为先。校门口的食品安全关乎青少年的身体健康,从结合教材讲授“食品安全”专业知识、设置“食品安全”问题以及探究“食品安全”切身影响等方面入手,可以在生物学课堂上进行食品安全教育,提高学生的安全意识,使青少年健康成长。