Virus have both an extracellular and an intracellular state. A virus is a submicroscopic particle containing nucleic acid surrounded by protein and occasionally containing other macromolecular components. In this extracellular state, the virus particle, also called the virion, is metabolically inert and does not carry out respiratory or biosynthetic

Mutualism Symbiosis is an obligatory interrelationship between two populations that benefits both of them Lichens is composed of a fungus and an alga

Methods in Microbial Ecology Microbial ecology focus on two major issues: (1) biodiversity, including the isolation, identification, and quantification of microorganisms in various habitats, and (2) microbial activity, that is, what are microorganisms doing in their habitats. We begin here with a consideration of assessing biodiversity through enrichment and isolation, and then consider nonculture methods of identification

Transcriptional Regulation in Bacteria Thanks to the relative ease of doing genetics with bacteria, transcriptional regulation in bacteria is better understood than that in other organisms and has served as a framework for understanding transcriptional regulation in eukaryotic organisms

1.了解微生物学实验基本概念; 2.认识微生物学实验基本材料; 3为实验做准备

复习思考题 被子植物的原始科---兰科的原始性表现在哪些方面? 答:木兰科的原始性表现在植物体为木本,单叶,全缘,羽状脉,虫媒花,花常单生,花部螺旋状排列,花药长,花丝短,单沟花粉,胚小,胚乳丰富等

一、旋转坐标系中的 Bloch方程 二、稳态条件下,核磁共振信号不随时间变化

一、自旋回波 二、J调制自旋回波

在样品管中溶液的深度由两个因子决定, 样品若超过一定高度,超过部分将会接收不到发射线圈发射的射频造成浪费; 若太低则样品与空气磁化率的不同造成界面磁化率突变会影响样品中磁场的均 匀性

在早期的连续波(CW)谱仪上多重 共振指除了观测用的射频场,另外 再加上其他照射场,若另加一个射 频场,称为双共振实验 现代的脉冲 Fourier变换谱仪上多重 共振是指核磁实验中施加针对不同 核的射频脉冲,在采集信号时也可 加上其他照射场