J.Michael Spector是美国教育和通讯技术协会(AECT)的现任主席,佐治亚大学学习和绩效支持实验室(Learning&Performance Support Laboratory)教授。Spector有着丰富的任教和研究经历,他曾工作过的佛罗里达州立大学和纽约锡拉丘兹大...J.Michael Spector是美国教育和通讯技术协会(AECT)的现任主席,佐治亚大学学习和绩效支持实验室(Learning&Performance Support Laboratory)教授。Spector有着丰富的任教和研究经历,他曾工作过的佛罗里达州立大学和纽约锡拉丘兹大学均为美国教育技术学的重镇。而他在挪威卑尔根大学负责教育信息科学与技术项目的近四年经历让他对欧美两大洲的有关领域都有深入的了解,他在美国阿姆斯特朗空军研究实验室教学系统研究任资深科学家的经历让他对教学设计在教育领域以外的应用有着深刻的理解。Spector最近的研究兴趣是关于复杂领域学习评估、智能绩效支持教学设计、系统动力学为基础的学习环境及技术集成。他几十年来一直活跃在第一线,刚于2008年主编完成《教育传播与技术研究手册》(第三版),而且将继续以开放的态度编辑第四版。考虑到他丰富的学术经历和成果,笔者与他的对话主动涉及了有关本领域研究边界和研究热点等重要问题。根据笔者了解,作为现任AECT的主席,他无疑是美国传统教育技术学的代表人物,却并不回避目前存在的领域界限模糊等问题。难能可贵的是,他对当前学习科学等新流派既提出了批评,又持宽容与合作的态度。本次对话中就包括了他对目前教育技术发展的现状分析和对今后研究热点的分析,这对我国同行思考教育技术学以及其他相关二级学科的发展方向的借鉴意义至少有两点,一是如何更积极地看待教育技术的研究边界,二是我国大学如何培养本学科发展的新增长点。展开更多
The definition of relatively stable expressed internal reference genes is essential in both traditional blotting quantification and as a modern data quantitative strategy.Appropriate internal reference genes can accur...The definition of relatively stable expressed internal reference genes is essential in both traditional blotting quantification and as a modern data quantitative strategy.Appropriate internal reference genes can accurately standardize the expression abundance of target genes to avoid serious experimental errors.In this study,the expression profiles of ten candidate genes,ACT1,ACT2,GAPDH,eIF1,eIF2,α-TUB,β-TUB,TBP,RNA Pol II and RP II,were calculated for a suitable reference gene selection in Paeonia ostii T.Hong et J.X.Zhang leaves under various drought stress conditions.Data were processed by the four regularly used evaluation software.A comprehensive analysis revealed that RNA Pol II was the most stable gene and eIF2 was the least stable one.In addition,the geNorm program provided the optimal choice of two reference gene combination,RNA Pol II andβ-TUB,for qRT-PCR normalization in P.ostii subjected to different drought stress levels.Our research provided convenience for gene expression analysis in P.ostii under drought stress and promoted research of effective methods to alleviate P.ostii drought stress in the future.展开更多
Glycosmis longipetala F.J.Mou&D.X.Zhang is described from Guangxi and Yunnan provinces in southwestern China.The new species is similar to G.cochinchinensis(Lour.)Pierre ex Engl.by its simple leaves,but distinguis...Glycosmis longipetala F.J.Mou&D.X.Zhang is described from Guangxi and Yunnan provinces in southwestern China.The new species is similar to G.cochinchinensis(Lour.)Pierre ex Engl.by its simple leaves,but distinguishable in having long-elliptic or oblanceolate(vs.ovate)leaves,long-ovoid to ellipsoid(vs.ovoid)floral buds,ovaries with many tubercles(vs.smooth)and glabrous(vs.pubescent)stamens.The pollen grains of the new species are 23.9±3.09(20.8-27.0)×22.0±1.80(20.4-24.4)μm in size with reticulate exine ornamentation in equatorial area and foveolate in polar area.The chromosome number of the new species is 2n=72.展开更多
以J C 皮特2000年出版的代表作《技术思考:技术哲学的基础》一书为起点,概述了皮特技术哲学思想基本观点以及所引发论争的焦点,分析了"皮特现象",即国际学术界对皮特技术哲学的反响。以此指出,我们应注重技术哲学的基础研究...以J C 皮特2000年出版的代表作《技术思考:技术哲学的基础》一书为起点,概述了皮特技术哲学思想基本观点以及所引发论争的焦点,分析了"皮特现象",即国际学术界对皮特技术哲学的反响。以此指出,我们应注重技术哲学的基础研究以及技术哲学研究的建制化发展。展开更多
从沉迷阅读的小“书虫”到全球畅销作家,J.K.罗琳用魔法书写传奇,诠释灵感与坚持的力量。J.K.Rowling,born Joanne Rowling in 1965,England,loved books from a young age.She wrote her first story,Rabbit,at six and a novel about ...从沉迷阅读的小“书虫”到全球畅销作家,J.K.罗琳用魔法书写传奇,诠释灵感与坚持的力量。J.K.Rowling,born Joanne Rowling in 1965,England,loved books from a young age.She wrote her first story,Rabbit,at six and a novel about cursed(被诅咒)diamonds at eleven.As a child,she was a bookworm with freckles(雀斑)and glasses.展开更多
摘要J.Michael Spector是美国教育和通讯技术协会(AECT)的现任主席,佐治亚大学学习和绩效支持实验室(Learning&Performance Support Laboratory)教授。Spector有着丰富的任教和研究经历,他曾工作过的佛罗里达州立大学和纽约锡拉丘兹大学均为美国教育技术学的重镇。而他在挪威卑尔根大学负责教育信息科学与技术项目的近四年经历让他对欧美两大洲的有关领域都有深入的了解,他在美国阿姆斯特朗空军研究实验室教学系统研究任资深科学家的经历让他对教学设计在教育领域以外的应用有着深刻的理解。Spector最近的研究兴趣是关于复杂领域学习评估、智能绩效支持教学设计、系统动力学为基础的学习环境及技术集成。他几十年来一直活跃在第一线,刚于2008年主编完成《教育传播与技术研究手册》(第三版),而且将继续以开放的态度编辑第四版。考虑到他丰富的学术经历和成果,笔者与他的对话主动涉及了有关本领域研究边界和研究热点等重要问题。根据笔者了解,作为现任AECT的主席,他无疑是美国传统教育技术学的代表人物,却并不回避目前存在的领域界限模糊等问题。难能可贵的是,他对当前学习科学等新流派既提出了批评,又持宽容与合作的态度。本次对话中就包括了他对目前教育技术发展的现状分析和对今后研究热点的分析,这对我国同行思考教育技术学以及其他相关二级学科的发展方向的借鉴意义至少有两点,一是如何更积极地看待教育技术的研究边界,二是我国大学如何培养本学科发展的新增长点。
基金This work was supported by the National Key R&D Program of China(2018YFD1000405)Jiangsu Modern Agricultural Industrial Technology System(JATS[2020]436)。
摘要The definition of relatively stable expressed internal reference genes is essential in both traditional blotting quantification and as a modern data quantitative strategy.Appropriate internal reference genes can accurately standardize the expression abundance of target genes to avoid serious experimental errors.In this study,the expression profiles of ten candidate genes,ACT1,ACT2,GAPDH,eIF1,eIF2,α-TUB,β-TUB,TBP,RNA Pol II and RP II,were calculated for a suitable reference gene selection in Paeonia ostii T.Hong et J.X.Zhang leaves under various drought stress conditions.Data were processed by the four regularly used evaluation software.A comprehensive analysis revealed that RNA Pol II was the most stable gene and eIF2 was the least stable one.In addition,the geNorm program provided the optimal choice of two reference gene combination,RNA Pol II andβ-TUB,for qRT-PCR normalization in P.ostii subjected to different drought stress levels.Our research provided convenience for gene expression analysis in P.ostii under drought stress and promoted research of effective methods to alleviate P.ostii drought stress in the future.
基金supported by National Natural Science Foundation of China(30370107).
摘要Glycosmis longipetala F.J.Mou&D.X.Zhang is described from Guangxi and Yunnan provinces in southwestern China.The new species is similar to G.cochinchinensis(Lour.)Pierre ex Engl.by its simple leaves,but distinguishable in having long-elliptic or oblanceolate(vs.ovate)leaves,long-ovoid to ellipsoid(vs.ovoid)floral buds,ovaries with many tubercles(vs.smooth)and glabrous(vs.pubescent)stamens.The pollen grains of the new species are 23.9±3.09(20.8-27.0)×22.0±1.80(20.4-24.4)μm in size with reticulate exine ornamentation in equatorial area and foveolate in polar area.The chromosome number of the new species is 2n=72.
摘要从沉迷阅读的小“书虫”到全球畅销作家,J.K.罗琳用魔法书写传奇,诠释灵感与坚持的力量。J.K.Rowling,born Joanne Rowling in 1965,England,loved books from a young age.She wrote her first story,Rabbit,at six and a novel about cursed(被诅咒)diamonds at eleven.As a child,she was a bookworm with freckles(雀斑)and glasses.