CentrifugationTheory
Centrifugation is a process used to separate or concentrate materials suspended in a liquid medium. The theoretical basis of this technique is the effect of gravity on particles (including macromolecules) in suspension. Two particles of different masses will settle in a tube at different rates in response to gravity. Centrifugal force (measured as xg, gravity) is used to increase this settling rate in an instrum......阅读全文
Mitochondrial－DNA－Isolation－from－Somatic－Embryogenic－Cell－Cultures－of－Larix
Mitochondrial DNA is isolated by a modification of the methods described by Wilson and Chourey (1984) and Radetzky (1990). Cell cultures at four days
Large－Scale－Tubulin－Preparation
Tubulin is purified from bovine/porcine brain by two cycles of polymerization/depolymerization followed by removal of copurifying proteins on a phosph
气孔的开闭机理
气孔的开关与保卫细胞的水势有关,保卫细胞水势下降而吸水膨胀，气孔就张开，水势上升而失水缩小，使气孔关闭。 引起保卫细胞水势的下降与上升的原因主要存在以下学说。 淀粉-糖转化学说 (starch-sugar conversion theory) 光合作用是气孔开放所必需的。黄化叶的保卫细胞
Cell－Extraction－Protocol
实验概要Primary tissues are valuable tools for the study of intracellular and extracellular markers which characterize disease states. We have developed
Immunoprecipitation
Immunoprecipitation (IP) is one of the most widely used immunochemical techniques. Immunoprecipitation followed by SDS-PAGE and immunoblotting, is rou
细菌人工染色体
The Construction of Bacterial Artificial Chromosome (BAC) Libraries (complete manuscript) (Clemson University Genomics Institute) Construction of BAC
A－semipermanent－mounting－medium－for－immunofluorescence－microscopy
A semi-permanent mounting medium for immunofluorescence microscopyMaterials6gm glycerol2.4gm mowiol6ml distilled water12ml Tris buffer 0.2M at pH 8.5M
Isolation－of－Total－RNA－from－Animal－Cells－use－RNeasy－Mini－Kit
实验概要Extract the total RNA from animal cells by using RNeasy Mini Kit (QIAGEN No.74104) 主要试剂SDS based extraction solution实验步骤1. Harvest cells.1) Try
Sci－Rep：利用“博弈论”寻找细菌耐药性机制
近日，华盛顿州立大学的研究人员开发了一种鉴定细菌内部抗生素抗性基因的新方法。 通过使用机器学习和博弈论，研究人员能够在三种不同类型细菌中寻找抗生素抗性基因，准确度高达93％至99％。相关结果发表在最近的《Scientific Reports》杂志上，文章作者是来自电气工程和计算机科学学院的Sh
概述青少年强直性脊柱炎的发病机制
1. HLA-B27结构与角色 1968年Dr.Eric Thorsby发现HLA-B27, 1973年发现HLA-B27与AS有强烈的关联性，据统计，95%的患者具有HLA-B27抗原(即HLA-B27阳性)；所有HLA-B27(+)的人，有2-10%终将发展成AS。除了HLA-B27外，
Preparation－of－Plasmid－DNA－by－Alkaline－Lysis－with－SDS:－Minipreparation
实验概要Plasmid DNA is isolated from small-scale (1-2 ml) bacterial cultures by treatment with alkali and SDS.主要试剂Buffers and Solutions: Alkaline lysis
Solidstate－physics－offers－insights－into－dielectric－properties－of－...
Solid-state physics offers insights into dielectric properties of biomaterialsA team of Russian, Czech and German researchers gained a new perspecti
Immunoprecipitation
实验概要In the IP method, the protein from the cell or tissue homogenate is precipitated in an appropriate lysis buffer by means of an immune complex
Bacic－Immunoprecipitation
实验概要 Immunoprecipitation (IP) is one of the most widely used immunochemical techniques. Immunoprecipitation followed by SDS-PAGE and immunoblotting,
逆合成孔径雷达成像（二）——雷达基本原理1
电磁散射 散射是当电磁波碰到不连续/非均匀性或物体时发生的物理现象。波动轨迹或路径的偏差通常称为散射。根据散射物体相对于电磁波波长的大小，可以对散射现象进行分类。雷达信号以不同的方式反射或散射，这取决于电磁波的波长和物体的形状(散射体)。如果电磁波的波长比散射体的大小小得多，电磁波就会反射回来
研究揭示线虫与自然产生的复杂细菌群落交互机制
近日，西北农林科技大学未来农业研究院罗文穗教授和植物保护学院韩自端教授通过模拟自然环境中的复杂微生物组，阐释了进化模式线虫 Pristionchus pacificus 与细菌群落的交互机制，相关研究成果发表在《自然-通讯》上。研究对不同时间点细菌群落的观察，支持了“streamlining the
研究揭示线虫与自然产生的复杂细菌群落交互机制
近日，西北农林科技大学未来农业研究院罗文穗教授和植物保护学院韩自端教授通过模拟自然环境中的复杂微生物组，阐释了进化模式线虫 Pristionchus pacificus 与细菌群落的交互机制，相关研究成果发表在《自然-通讯》上。研究对不同时间点细菌群落的观察，支持了“streamlining
单孔径多通道超分辨成像光学系统（二）
2 Change of the primary mirror of this telescopeFor any telescopes, the primary mirrors provided with power and aperture diameter which were used
An－Integrative－Procedure－for－Apoptosis－Identification－and－Measurement2
TroubleshootingCritical Steps(1) Don’t trypsinize cells for too long when collecting them.(2) Rotation speed should be no more than 1500 rpm during ce
Polycrystalline－thin－films质谱样品准备
This method of sample preparation produces a uniformlayer of very small crystals on the mass spectrometer's sample stage that are mechanically
Protein－extraction－from－whole－tissues－for－IEF
Modified from that of Jay Thelen - University of Missouri-ColumbiaPhenol extraction followed by methanolic ammonium acetate precipitation - an effecti
Isolation－and－Culture－of－Multipotent－Stem－Cells－from－Human－Bone－Morrow
Bone marrow contains three types of stem cells:1. Hematopoietic stem cells give rise to the three classes of blood cells that are found in the circu
Isolation－of－stromal－vascular－cells－from－human－adipose－tissue
Stromal stem cells proliferate in vitro and may be differentiated along several lineages. The scarcity of stromal stem cells in tissues and the la
DNA指纹法
DNA Fingerprinting (David F. Betsch)the theory, procedures and applications · DNA Fingerprinting (Polyarylamide Gel) (Caltech)BAC DNA sample
米氏散射量论的原理是什么
米氏(光散射)理论（Mie theory (cflight scattering)） 是G.Mie于1908年提出的，有关在介质之中的颜料粒子对光散射的理论。 具体是指单一的、各向同性的球形粒子在高度稀释的介质系统中的光散射与该粒子直径、粒子与介质间的折射率之差、入射到介质中的粒子上的入射光的
光合磷酸化的化学渗透学说
关于光合磷酸化的机理有多种学说，如中间产物学说、变构学说、化学渗透学说等，其中被广泛接受的是化学渗透学说。 化学渗透学说(chemiosmotic theory)由英国的米切尔(Mitchell，1961)提出，该学说假设能量转换和偶联机构具有以下特点： ①由磷脂和蛋白多肽构成的膜对离子和质
浮力密度离心的定义
中文名称浮力密度离心英文名称buoyant density centrifugation定 义密度梯度离心达到平衡时，各种颗粒(分子、病毒、亚细胞成分等)会悬浮在与自身密度相同的区带中而得到分离的依密度分离的离心法。并由此可测得其颗粒密度。密度梯度介质最常用的是氯化铯(CsCl)，因为CsCl能提
Fastfilter－Plasmid－Midi－Kit－Spin－Protocol
实验概要The E.Z.N.A.TM Fastfilter Plasmid Midi Kit combines the power of HiBind® technology with the time-tested consistency of alkaline-SDS lysis of
重组DNA的分离、克隆与测序实验手册6
Electroporation ProtocolPreparation of Electro-competent Cells:1. Grow XL1-Blue cells on a tetracycline plate (20 ug tet/ml of LB agar)2. Inoculate 3
Fastfilter－Plasmid－Midi－Kit－Vacuum/Spin－Protocol
实验概要The E.Z.N.A.TM Fastfilter Plasmid Midi Kit combines the power of HiBind® technology with the time-tested consistency of alkaline-SDS lysis of