引领学生从"泄氯"事件中研究氯气——高一化学《氯气的实验室制法和氯气与水、碱的反应》的课堂实录

本课承接传统的教学模式,很好地渗透了新的教学理念。在课程资源、学习方式和科学探究等方面,教者做了有益的尝试。特别是在整合教学资源的基础上设计出清晰的教学线索,引导学生步步紧逼学习目标的做法成为本课的亮点。如果在氯气制备实验活动上再放手一些,让学生根据氯气的特性和已有知识,自主设计实验装置,然后通过合作交流形成共同的实验方案,必将成为一堂真正的探究性课堂。     

信息技术与中学历史学科整合的探索与反思

随着新课程改革的开展,信息技术与学科课程整合已成为现代教学发展的必然趋势.本文通过对信息技术与历史学科整合的特点分析,结合二者整合的现状和存在问题,分析了在整合过程中应该注意的问题和解决的措施.     

我国农业生态环境的修复和保护

农村生态环境保护直接关系到农业的可持续发展与国民经济的发展.本文分析了当今农业生态系统中存在的问题,并提出了农村生态环境管理的具体防治措施及搞好农业生态的几点建议.     

美国国家实验室科研特征的情报计量学分析

选取美国能源部、航空航天局(NASA)、国防部下属19家国家实验室,从论文总量、资助机构、作者来源、国内外合作研究、科学设施与装置的利用情况及论文影响力几个方面分析美国典型国家实验室的科研特征.研究发现,美国典型国家实验室的科研活动以政府主管部门为其主要资助机构,国防相关部门为重要资助来源,以灵活多样的人才聘用形式(双...     

Simultaneous changes in seed size,oil content and protein content driven by selection of SWEET homologues during soybean domestication

Soybean accounts for more than half of the global production of oilseed and more than a quarter of the protein used globally for human food and animal feed. Soybean domestication involved parallel increases in seed size and oil content, and a concomitant decrease in protein content. However, science has not yet discovered whether these effects were due to selective pressure on a single gene or multiple genes. Here, re-sequencing data from >800 genotypes revealed a strong selection during soybean domestication on GmSWEET10a. The selection of GmSWEET10a conferred simultaneous increases in soybean-seed size and oil content as well as a reduction in the protein content. The result was validated using both near-isogenic lines carrying substitution of haplotype chromosomal segments and transgenic soybeans. Moreover, GmSWEET10b was found to be functionally redundant with its homologue GmSWEET10a and to be undergoing selection in current breeding, leading the the elite allele GmSWEET10b, a potential target for present-day soybean breeding. Both GmSWEET10a and GmSWEET10b were shown to transport sucrose and hexose, contributing to sugar allocation from seed coat to embryo, which consequently determines oil and protein contents and seed size in soybean. We conclude that past selection of optimal GmSWEET10a alleles drove the initial domestication of multiple soybean-seed traits and that targeted selection of the elite allele GmSWEET10b may further improve the yield and seed quality of modern soybean cultivars.     

淡泊与神性——谈当下中国书法界的浮躁心理

当下中国书法界,名利欲望的极度膨胀,致使许多人产生浮躁心理,书法媚俗。宜淡泊、克己、去杂欲,对神性敬畏与谦卑,神人以和,克服浮躁心理,提倡淡泊拒绝媚俗。     

基于知识基础上的迁移研究新进展

通过对基于知识基础上的迁移理 论和迁移研究的最新进展的阐述，着重介绍了知识对迁移的作用和影响。最后对迁移研究的方法进行评述，对未来迁移研究的趋势进行了展望。     

Realism Matters: The Role of Perceived Realism in The Biggest Loser

This study investigated implications of viewing The Biggest Loser, NBC’s popular reality television show. Using online survey data collected from 613 participants, results suggest that exposure to the program is positively associated with perceived realism of the program, which in turn is positively associated with developing internal weight locus of control. Meanwhile, internal weight locus of control is positively associated with audience members’ exercise behavior, meaning the higher level of internal weight locus of control the audience members develop, the more likely they are to engage in physical exercise. This study offers evidence that health-related reality television might be a useful tool to influence audience members’ cognitions on health issues, which could potentially lead to healthy lifestyles.     

运用物理知识,解决实际问题

物理源于生活,用于生活,日常生活中的方方面面都与物理有着千丝万缕的联系。只要我们开动脑筋,勤于思考,善于分析,应用物理知识,便可解决生活中的许多问题。例如:问题一:如何辨别生熟蛋不小心把一只生蛋和一只熟蛋放在一起了,在不敲破蛋壳的条件下用何种简单的方法把它们分辨出来呢?我们只需把这两只蛋放在相对平滑的桌面上,用两只手指对它们施加大致相等的力,使其旋转,转得快且持续时间较长的则是熟蛋,而另一只转得慢且很快就停下来的则是生蛋。生蛋与熟蛋的蛋内物质一个是液态一个是固态。当用力转动蛋时,蛋壳因受力而被迫转动,但生蛋内液…     

核心素养在高职称量实训教学设计中的体现

在教学设计中,核心素养是三维课程目标的继承与发展,是教学适应社会发展的理论指导。社会生活对于学生的发展提出新的要求,这种要求在职业教育阶段更为突出。在食品、药品生产与经营相关专业的职业教育中,做出精准快速的称量操作,是学生应该掌握的基础技能和职业素质。这项实训课程应不断创新教学设计,体现核心素养。