Air Buoyancy Akin to water keeping something afloat, samples can be “lifted” by air, artificially decreasing their apparent weight. This air buoy￾ancy can have a significant effect on smaller samples. Electrostatic Forces Electrostatic charges are almost always present in any environ￾ment, particularly in areas with very low humidity. If there are

This book celebrates the importance of the question; it is not meant to be a collection of facts or procedures. The writing of this book was inspired by 16 years of queries from the research community.The con￾tributors and I have tried to meet two primary objectives:

What Are the Symptoms of Acrylamide Poisoning? The initial symptoms of acrylamide poisoning on the skin are peeling of the skin at the point of contact, followed by tingling and numbness in the exposed area. If exposure by any means (touch, ingestion, inhalation) continues, muscular weakness, difficulty maintaining balance

一、构成性转录因子SP1对持家基因的调控作用 1、Housekeeping （constitutive）genes （持家 基因） : 细胞内的蛋白质编码基因，维持细胞的基 本过程。 2、 SP1结合于保守性序列GGGCGG的GC丰富 序列，该序列位于许多持家基因的启动子中。 3、 SP1含有: 3 zinc finger motifs which bind to GC-rich sequance , 2个 glutamine-rich domains interact with TAFII110 of TFII D

一、 一般特征 二、 DNA 聚合酶链反应 三、 细菌 DNA 的复制 1、E.coli 中的 DNA 聚合酶：3 种 2、复制起始点的特点：在 E.coli 中，只有一个复制点，oriC

一、顺式作用元件和反式作用因子 Cis-acting element：不编码任何产物的 DNA片段，能影响与之相联系的同一条 DNA链上的基因表达 :启动子。 Trans-acting factor （转录因子TF） 由调节基因编码，调节基因是一种特殊 的结构基因，其编码产物（RNA或蛋白质） 可以扩散，控制其他基因的表达

一、 hnRNA 二、 pre-mRNAs 三、 hnRNP 四、 snRNPs 五、pre-mRNA processing The alternative mRNA processing is the conversion of pre-mRNA species into more than one type of mature mRNA

In both prokaryotes and eukaryotes, primary RNA transcripts undergo various alteration or processing events to become mature RNAs: The three commonest types are: 1, nucleotide removal by nucleases; 2, nucleotide addition to the 5’- or 3’-end, 3, nucleotide modification on the base or thesugar

一、水文预报的分类按预报的项目分：径流预报、冰情预报、沙情预报与水质预报； 径流预报：洪水预报和枯水预报——水位和流量。 按预见期长短分：短期水文预报、中长期水文预报

第二章对径流的形成过程作了定性的描述，本章从定量的角度阐述降雨形成径流的原理和计 算方法，它是以后学习由暴雨资料推求设计洪 水、降雨径流预报等内容的基础