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
Centrifugation－Theory
Centrifugation is a process used to separate or concentrate materials suspended in a liquid medium. The theoretical basis of this technique is the eff
Centrifugation
CentrifugationThe single most important advance in the use of centrifugal force to separate biologically important substances. was the coupling of mec
Centrifugation2
RELATIVE CENTRIFUGAL FORCE Figure F.2. Nomogram for R.C.F.Modern day ultracentrifuges can generate forces in excess of 300,000 times that of gravity,
Appendix－F:－Centrifugation
The single most important advance in the use of centrifugal force to separate biologically important substances. was the coupling of mechanics, optics
Appendix－F:－Centrifugation——2
ROTOR COMPARISONSWhen separating a particle, it is convenient to be able to compare one rotor's design characteristics with those of a differing r
Basic－Theory－and－Use－of－GCMS（一）
BASIC THEORY AND USE OF GC-MSbyDr. Eugenia SobolevaContent1. Introduction.2. GC-MS systems and components.3. Vacuum system3.1. Rotary pump3.2. Di
Basic－Theory－and－Use－of－GCMS（二）
For ionisation to take place at all, chemical reaction between the sample and the reagent gas must be exothermic. The grater the heat of the reaction,
离心技术（centrifugation－technique）与离心机类型(1)
最大速度方法(1)移动界面超速离心法含几个组分的样品在足够高的离心场中离心时，每种颗粒都达到其最大沉降速度，这时样品开始分离。离心管的上层逐渐形成透明的上清液，并形成对应于样品各组分的一系列浓度界面，界面的移动相对于每种组分来说是特征的。虽然利用这种方法不一定能实现组分的纯化分离，但可以通过监测界面
离心技术（centrifugation－technique）与离心机类型(2)
离心机类型通常所使用的离心机根据转子转速大小的不同可分为普通离心机、高速离心机和超速离心机三类。(1)普通离心机一般来说，最大转速不超过6000r/min 者属普通离心机；如国产的80—1型，LXJ—Ⅱ型等。离心机转速与相对离心力的测算，如图2—37。普通离心机转子在室温下运转，转子室内的温度一般无
重组DNA的分离、克隆与测序实验手册
edited by Bruce A. Roe Judy S. Crabtreeand Akbar S. KhanDepartment of Chemistry and Biochemistry The Uni
Low－Loss－Sapphire－Windows－for－High－Power－Microwave－Transmission（四）
Membrane effects describe the case where the disk stretches rather than bends. Figure 5 shows the differences in the deflection and stress for the
谈谈实验室离心机高速离心的工作原理和特点
通常情况下，制备型超高速（preparative super-speed）实验室离心机高速离心的原理有差速离心（differential centrifugation）和密度梯度离心（density gradient centrifugation）两种。其中，差速离心法是相对更为常用的方法。Usua
离心的基础知识
Centrifugation is a process used to separate or concentrate materials suspended in a liquid medium. The theoretical basis of this technique is the eff
Low－Loss－Sapphire－Windows－for－High－Power－Microwave－Transmission（五）
Single crystal sapphire is not a typical optical material, with a standard strength not much lower than the steel described above, since the ave
区带离心的概念和用途
狭义的区带离心（zonal centrifugation）主要是采用蔗糖，偶尔也用甘油或其他溶液铺梯度，因此也被称作蔗糖梯度离心（sucrose graduation centrifugation）。而平衡离心（equilibrium centrifugation）是在密度梯度中进行，以CsCl制成
Low－Loss－Sapphire－Windows－for－High－Power－Microwave－Transmission（七）
The failure data is shown for the 12.5 mm diameter disks is shown in Fig. 12. The average failure pressure for the standard disks is 12 MPa, whe
Plasma－and－Serum－Preparation
实验概要Serum is the liquid fraction of whole blood that is collected after the blood is allowed to clot. The clot is removed by centrifugation and the
Basics－of－Electrochemical－Impedance－Spectroscopy（一）
This tutorial presents an introduction to Electrochemical Impedance Spectroscopy (EIS) theory and has been kept as free from mathematics and ele
膜电位的发现与研究
1791年意大利解剖学家加伐尼(L.Galvani)偶然发现，如果将蛙腿的肌肉置于铁板上再用铜钩钩住蛙的脊髓，当铜钩与铁板接触时肌肉就会发生收缩，他把这种现象归因于动物电。1902年德国生理学家伯恩斯坦(Julius Bernstein)接受了德国化学家奥斯特瓦尔德(W.Ostwald)的膜通透性理
膜电位的研究与发现
1791年意大利解剖学家加伐尼(L.Galvani)偶然发现，如果将蛙腿的肌肉置于铁板上再用铜钩钩住蛙的脊髓，当铜钩与铁板接触时肌肉就会发生收缩，他把这种现象归因于动物电。1902年德国生理学家伯恩斯坦(Julius Bernstein)接受了德国化学家奥斯特瓦尔德(W.Ostwald)的膜通透性理
Low－Loss－Sapphire－Windows－for－High－Power－Microwave－Transmission（八）
Strength Prediction. Large deflection theory solves for the deflection of a disk as a function of loading and boundary condition. Stress is a deri
Isolation－of－liver－lymphocyte
Isolation of liver lymphocyte Several lymphocyte subpopulations reside in the normal adult human liver. Liver lymphocytes mainly include a large n
Extraction－of－DNA－From－Plants－Using－Plant－DNAzol®－Reagent
实验概要Plant DNAzol® is an extra-strength-DNAzol® reagent (patent pending) specifically formulated for the isolation of genomic DNA from plants. The Plan
Large－Scale－Plasmid,－Cosmid,－BAC,－PAC,－and－Fosmid－DNA－Isolation
DNA Isolation by a Cleared Lysate Method Followed by Double Acetate Precipitation Version 3b - updated September 26, 1999The Most Recent Roe Lab Imple
重组DNA的分离、克隆与测序实验手册7
III. Methods for DNA isolationA. Large scale double-stranded DNA isolationThe method used for the isolation of large scale cosmid and plasmid DNA is a
Embryo－Lysates－－Immunoprecipitation
Embryo lysatesTake 25 embryos and place into 1.7ml centrifuge tube.Rinse once in lysis buffer (add ~ 1ml) and remove by aspirationAdd 500 µL lysis buf
Transformation－of－E.－coli－by－Electroporation
实验概要 Electrocompetent bacteria are prepared by growing cultures to mid-log phase, washing the bacteria extensively at low temperature, and
Measurement－of－GFP－Expression－and－DNA－Content－in－Permeabilized－Cells
ReagentsCells to be studied expressing green fluorescent protein (GFP). Note that the same cell type without GFP is needed as a control.1 X PBS2% Buff
Preparation－of－Plasmid－DNA－by－Alkaline－Lysis－with－SDS:－Maxipreparation
实验概要Plasmid DNA is isolated from large-scale (500 ml) bacterial cultures by treatment with alkali and SDS.主要试剂Buffers and SolutionsAlkaline lysis solu
ImmunohistochemistyFluorescence－Protocol1
MaterialsCytokine-specific Primary Antibodiesunlabeled or biotinylated antigen-affinity purified polyclonal antibodies (R&D Systems ''AF'&