概念图在遗传学教学中的探索与应用

概念图是表征和揭示知识结构中意义联系的图表。在遗传学教学中, 选择性地使用概念图有助于教师进行课程内容的组织与复习, 检测学生的学习成果; 概念图的应用可以提升学生的认知水平, 帮助学生建立系统完整的知识体系。文章对概念图在遗传学教学中的探索与应用进行了概述。     

试分析高中生物教学中概念图的运用

随着我国课程改革的发展,为了使学生的学习效率得到充分的提升,对教学方式的要求也越来越多。本文以高中生物教学中的概念图为主要研究对象,全面分析概念图能够在高中生物教学中具有良好效果的原因,详细阐述了概念图的作用及概念图在生物教学中的应用。     

浅谈运用概念图进行高中生物教学

根据意义学习、概念同化的理论,美国诺瓦克教授开发了一种新的用概念图的工具,尤其学生在理解"能量、细胞和进化"等抽象概念时能够应用。这个工具具有很好的教育功能和教育价值。概念图已经作为一种在教与学过程中的有效的工具,使得学生能够组织、建构自己的知识,达到自己会学习。如何使用概念图进行教学呢,我结合自己的教学实践,从以下几个方面进行了阐述并且探讨了在高中生物教学中,概念图用于教学的好处。     

概念图在高中生物教学中的运用研究

概念图在高中生物教学中得到推广,取得了良好的教学效果。概念图有利于把分散的生物知识点系统化,能够让学生更加清晰的学习和复习知识。教师通过概念图,能够帮助学生定位学习中的难点,找出自己的不足,提升学生对知识的熟练程度。     

运用概念图进行生物教学对学生认知方式的影响

随着新课程改革的深入发展,生物教学被要求紧跟时代发展的步伐,推陈出新,在课程中融入新的教学模式,不断丰富教学方法。在生物教学中运用概念图是教学发展的必然趋势,它能将新旧知识点整合在一起构成一个完整的知识体系,提升学生的学习积极性,培养他们自主学习能力与独立思考意识,有效提高学生的认知水平,为进一步提升生物课堂效率打下坚实的基础。本文简述了概念图的概念与将概念图运用于生物教学的作用,结合实例证明了概念图对提高学生认知水平的积极影响,希望能以此为广大生物教师改进教学模式、提高课堂效率提供必要的帮助与启发。     

基于概念图的初中生物学复习教学实践

生物学复习教学中,学生自主绘制概念图,知识再现方式更加灵动;教师根据绘制的概念图准确判断学生对知识的掌握情况并进行正向引导,评价平台更为直观;转换课堂主体,激发学习热情,兼顾学生差异,避免马太效应,学习方式更为主动;用概念图复习,培养学生收集处理信息能力、分析解决问题能力和交流合作能力;通过分层巧设概念图任务,教师可以为每个学段的学生量身定制一份复习套餐,使教育面向全体学生。     

概念图在高中生物教学中的应用

概念图是用来组织和表征知识的工具。概念图作为一种有效的教与学的策略。新课标中合理使用概念图,对有效地帮助教师掌握学生的认知和思维情况,有效提高教学效率,帮助学生掌握一定的学习方法,从而达到"教学相长"的效果。     

电子概念图在医学微生物学教学中的应用

研究电子概念图对提高医学微生物学教学效果的作用。设计实验组和对照组, 实验组完成电子概念图练习, 填写问卷表, 与对照组一起参加闭卷考试; 用社会科学统计软件包 (Solutions statistical package for the social sciences, SPSS) 分析闭卷考成绩, 讨论、评价问卷答案。在练习过程中, 教师制作概念图脚手架, 学生完成作业后, 教师再提供反馈意见。两组闭卷考试总分和名词解释等得分有明显差异; 调查问卷提示, 实验组多数学生认为电子概念图有利于提高理解记忆力。概念图反映大脑的思考过程, 展示发散性思维。概念图可提高实验组学生的《医学微生物学》成绩, 是医学教学的有力助手。     

概念图及其在教与学中的应用

1 关于概念图的概述概念 图是一种关于概念知识、思维过程或思维结果、系统结构、计划流程等的图形化表征方式，它由节点、链接（节点间的连线）和节点间的关联词组成。康奈尔大学的Joseph D．Novak博士根据奥苏贝尔（David P．Ausubel）学习理论于1960年始研究概念图技术，并使之成为一种教学工具。学生利用概念图进行知识的自主建构，教师利用概念图引导和考察学生组织知识、理解知识的过程，都与建构主义学习观是一致的。     

概念图策略在生理学教学实践中的应用

目的:探讨概念图策略在高职护理专业生理学教学实践中的效果。方法:随机抽取57名学生作为实验组,54名学生作为对照组;实验组施行概念图策略教学法,对照组则采用传统教学法。分别比较两组学生的单元测验成绩和期末考试成绩,并于全部课程结束后进行问卷调查,分析调查结果。结果:实验组学生的单元测试成绩和期末考试成绩均明显高于对照组学生,差异具有统计学意义(P<0.05);实验组94.34%的学生认为教学能够提高学习主动性,而对照组为64.81%;实验组84.21%的学生认为教学有助于提升对课程内容的理解,而对照组为64.11%;实验组87.72%的学生认为教学促进师生互动,而对照组为38.89%;实验组84.21%的学生认为教学可增强团队合作精神,而对照组为57.41%。实验组的调查结果明显优于对照组,差异具有统计学意义(P<0.05)。结论:将概念图策略引入高职护理专业的生理学课程教学实践中,能够更好的帮助学生掌握生理学的理论体系,提升教学质量,提高学生的专业知识水平。     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

鸡传染性法氏囊病病毒研究进展

传染性法氏囊病(Infection bursal disease, IBD)是由鸡传染性法氏囊病毒(Infectious bursal disease virus, IBDV)引起的鸡和火鸡的一种高度接触性传染病,给世界各国的禽养殖业带来了巨大损失.自IBDV发现至今新的变异株不断出现,分子结构的改变导致病毒致病力的改变及宿主对疫苗应答的改变,使得传统的疫苗已不能控制其流行,因此各国学者对其基因组结构和功能进行了广泛深入的研究,并积极研制新型有效的疫苗以达到防治的目的.     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).