霍乱弧菌群体感应和新型抗生素 - Bonnie Bassler P2
本视频由科普中国和生物医学大讲堂出品
Bonnie Bassler (Princeton) Part 2: Vibrio Cholerae Quorum Sensing and Novel Antibiotics
Bacteria, primitive single-celled organisms, communicate with chemical languages that allow them to synchronize their behavior and thereby act as enormous multi-cellular organisms. This process is called quorum sensing and it enables bacteria to successfully infect and cause disease in plants, animals, and humans. Investigations of the molecular mechanisms underlying quorum sensing are leading to the development of novel strategies to interfere with quorum sensing. These strategies form the basis of new therapies to be used as antibiotics. See more at http://www.ibioseminars.org
免疫反应的细胞基础 - Ira Mellman P1
本视频由科普中国和生物医学大讲堂出品
Ira Mellman (Genentech) Part 1: Cellular Basis of the Immune Response
The immune system is charged with protecting us from invading microorganisms, a task that falls to a complex array of highly specialized cell types spread throughout the body but that must work together as an integrated system. How they accomplish and perform their functions can be wonderfully understood by probing the basic mechanisms governing their activities. In the first video, we will consider the overall organization of the immune response in cellular terms, the innate immune system (comprising evolutionarily ancient phagocytic cells that recognize conserved molecules of microorganisms) and the adaptive immune system (composed of lymphocytes that recognize chemically diverse antigens).
DNA连接反应
分子生物学中,连接是指通过形成磷酸二酯键将两个DNA片段连起来。连接反应是由一种叫连接酶的酶催化进行的。在细胞内,连接酶用于修复在DNA复制过程中的单链或双链的断裂。在实验室里,DNA连接酶用于分子克隆来连接插入片段和载体-它是宿主生物内复制目的片段的DNA载体分子。
本短片介绍了DNA连接。讲述了连接的基本原理以及准备一个常用的连接反应的逐步步骤,并讨论了连接反应中的关键因素,例如粘末端突出端的长度对反应温度的影响,如何调整DNA插入片段与载体的比例来防止自身连接。还将提及辅助连接的分子生物学工具如Klenow片段和虾的碱性磷酸酶SAP,并讲述连接的应用,例如邻位连接和为测序在片段上添加接头序列。
PCR:聚合酶链式反应
聚合酶链式反应,或称PCR,是一种通过热循环反应来扩增DNA的技术,热循环是指在固定的时间间隔内温度变化的循环。采用热稳定的DNA聚合酶,PCR可以用DNA的合成原料,脱氧核苷三磷酸合成大量的DNA拷贝。PCR反应包括三步,变性,退火,和延伸。变性是PCR循环的第一步,它将DNA碱基之间的氢键打开来熔解DNA双链而产生单链DNA。退火则是将温度降到足够低,使寡聚核苷酸引物能够结合到DNA模板上。在延伸过程中,DNA聚合酶将合成新的双链DNA。
本短片将介绍PCR的过程。除了逐步讲述如何准备一个常用的PCR反应,还将描述PCR的基本原理。视频展示了一个PCR反应的所需组分,以及引物设计的规则,并给出了保证PCR反应成功的一些有用技巧。
跆拳道的心身之道,如何应用在科学研究
Anita Sil (UCSF/HHMI): The Way of the Hand, Foot, Heart, and Mind
During graduate school, Anita Sil started taekwondo(跆拳道) as a new way to get a good workout. Years later she was still at it, ultimately earning the highest honor- a black belt. Sil believes that many of the lessons of taekwondo, such as staying focused on long-term goals, also apply to science.
未折叠蛋白反应的发现
Proteins that are secreted from the cell or inserted into the plasma membrane, transit through the endoplasmic reticulum where they are properly folded and assembled and may undergo post-translational modification. Walter tells the story of the exciting discovery made in his lab of the "unfolded protein response", a feedback pathway that ensures that the cell makes enough ER to properly modify all the secreted proteins in the cell.
将RNAscope®技术应用于病毒学的研究
Advanced Cell Diagnostics邀请了美国加利福尼亚大学(Davis)微生物、免疫及病理学系教授Patricia Pesavento,为大家介绍应用RNAscope®技术在研究新发现的病毒及致病病因、病理方面的研究。引起疾病的病毒可以跨越种族感染,通过测序发现新型病毒,利用RNAscope®进行病毒病理学分析,以准确判断疾病及复杂的宿主病毒相互影响。在这一讲座中,Pesavento教授以乳头瘤病毒等举例,对病毒的潜伏、致瘤和急性裂解细胞分析,分享了病毒学的研究进展。
RNAscope®技术可以针对任一病毒(或亚型)序列设计特异性探针,通过原位定量检测获得病毒感染、潜伏及与宿主反应的研究信息。详细信息请访问ACD官网www.acdbio.com。更多中文资料请关注中国官方微信号(ACD_China)咨询。
GE:层析技术在病毒性疫苗中的应用策略
内容主要会覆盖目前中国市场疫苗现状,为了提高疫苗的质量标准,大多数厂家都开始对传统疫苗工艺进行升级换代,又或是选择更高效安全的层析方式进行抗原纯化,尤其是病毒性疫苗又有着通用性的策略,从而达到简化工艺流程,缩短工艺时间,提高疫苗质量
GE:微载体在贴壁细胞大规模培养中的应用
内容主要讲述了微载体的本质属性以及关键参数,以及这些参数在细胞放大培养过程中的关键作用。微载体球转球放大过程中的注意事项。
GE:多功能激光成像技术在分子生物学领域的应用
您的分子生物学实验室是否面临各种各样的成像要求?PCR后核酸成像,蛋白电泳考染成像,SSCP银染成像遍布各大实验室;Souther、Northern、Western面面俱到;各种荧光标记探针,荧光ELISA检测,EMSA检测随后而来。您的研究还涉及到转基因植物,转基因昆虫?课题组新合成了小分子药物,它在动物体内将如何代谢?以上种种都可以通过多功能激光成像的技术帮您解决。