PhaseContrastMicroscopy
Phase Contrast MicroscopyPrincipleMost of the detail of living cells is undetectable in bright field microscopy because there is too little contrast between structures with similar transparency and no color. Unless the specimen mount is extremely thin, dark field mode may distort details. However the various organelles show wide variation in refractive index, that is, the tendency of the materials to bend light, prov......阅读全文
Quantification－of－Cyclic－Dinucleotides－by－ReversedPhase－LCMS/MS
Cyclic dinucleotides such as bis-(3′,5′)-cyclic dimeric adenosine monophosphate (c-di-AMP) and bis-(3′,5′)-cyclic dimeric guanosine monophosphate
液相色谱仪流动相(MOBLLE－PHASE)的问题
甲醇和乙腈在高效液相色谱分析法中常常被用来配制流动相。高效液相色谱法中常用的试剂最好是高等级的专用试剂，如色谱纯试剂。在要求不太严格时，优级纯甚至分析纯的试剂也能用。高效液相色谱分析法中常用的是紫外检测器，因此，从降低基线噪音和提高分析灵敏度上来考虑，应该使用紫外吸收小且杂质含量少的色谱纯试剂。1、
反向微柱的准备Preparation－of－ReversedPhase－Microcolumns
INTRODUCTIONOne versatile strategy for sample cleanup prior to MALDI-MS analysis uses microscale columns designed for direct sample elution onto the M
Preparation－of－Genomic－DNA－from－Bacteria－using－Phase－Lock－GelTM
Preparation of Genomic DNA from Bacteria- using Phase Lock GelTM (Modified from Experimental Techniques in Bacterial Genetics, Jones and Bartlet, 1990
Use－of－SemiThin－Cryosections－for－Light－Microscopy.
Use of Semi-Thin Cryosections for Light Microscopy.Semi-thin sections can be obtained from frozen blocks of cryoprotected biological material by secti
Optimized－Method－for－the－Preparation－of－Rodent－Testicular－Cells2
Flow Cytometric AnalysisPrior to flow cytometric analysis, the vital dye Hoechst 33342 (Sigma-Aldrich, St. Louis, MO, USA) was added to cell suspensio
Subculture－of－Suspension－Cell－Lines
AimIn general terms cultures derived from blood (e.g. lymphocytes) grow in suspension. Cells may grow as single cells or in clumps (e.g. EBV transform
Metaphase－chromosome－preparation
Materials: RPMI 1640 medium fetal calf serum (FCS), 20% Colcemid (e.g. Boehringer Mannheim cell biology reagents, Best.-Nr. 295892) cell cuture flask
CGH－Protocols－（一）
Metaphase chromosome preparationMaterials: RPMI 1640 medium fetal calf serum (FCS), 20% Colcemid (e.g. Boehringer Mannheim cell biology reagents, Best
Nucleolar－Isolation－Protocol
We recommend that you first download and read this page as a PDF file. Using that as your guide, you can then follow the protocol below and view a Qui
Methods－for－the－Measurement－of－a－Bacterial－Enzyme－Activity－in－Cell－Lysates
AbstractThe kinetic characteristics and regulation of aspartate carbamoyltransferase activity were studied in lysates and cell extracts of Helicobacte
Lysosome－Isolation－in－Isotonic－Sucrose
LEVEL IMATERIALSRat liverPhysiological saline (0.85% w/v NaCl)0.25 M sucrose in 10 mM Tris-HCL, pH 7.4Brendler teflon homogenizerRefrigerated preparat
高效液相色谱仪流动相(MOBLLE－PHASE)的问题介绍
甲醇和乙腈在高效液相色谱分析法中常常被用来配制流动相。高效液相色谱法中常用的试剂最好是高等级的专用试剂，如色谱纯试剂。在要求不太严格时，优级纯甚至分析纯的试剂也能用。高效液相色谱分析法中常用的是紫外检测器，因此，从降低基线噪音和提高分析灵敏度上来考虑，应该使用紫外吸收小且杂质含量少的色谱纯试剂。
Cell－Cycles－－Introduction
The onion root tip and the whitefish blastula remain as the standard introduction to the study of mitosis. The onion has easily observable chromosomes
氯离子外流通过肌醇3,4,5,6四磷酸盐调控花粉管的生长...
氯离子外流通过肌醇3,4,5,6-四磷酸盐调控花粉管的生长和细胞的体积花粉管生长是生物系统中自发组织的一个重要实例。在这些自发系统中，通过交互反馈通路传递信号，从而控制并调整分子及生化参数使之最适于生长和发挥作用。花粉作为一种研究植物细胞发育、生长以及生物生理学的模式材料，发现花粉管的振荡生长与Ca
扫描电子显微镜(Scanningelectron－microscopy,－SEM)
扫描电镜分析可以提供从数纳米到毫米范围内的形貌像，观察视野大，其分辩率一般为6纳米，对于场发射扫描电子显微镜，其空间分辩率可以达到0.5纳米量级。其提供的信息主要有材料的几何形貌，粉体的分散状态，纳米颗粒大小及分布以及特定形貌区域的元素组成和物相结构。扫描电镜对样品的要求比较低，无论是粉体样品还是大
原子力显微镜(Atomic－Force－Microscopy－，简称AFM)
原子力显微镜的工作原理就是将探针装在一弹性微悬臂的一端，微悬臂的另一端固定，当探针在样品表面扫描时，探针与样品表面原子间的排斥力会使得微悬臂轻微变形，这样，微悬臂的轻微变形就可以作为探针和样品间排斥力的直接量度。一束激光经微悬臂的背面反射到光电检测器，可以精确测量微悬臂的微小变形，这样就实现了通过检
Exercise－12.10－－Establishment－of－a－Primary－Culture
Exercise 12.10 - Establishment of a Primary CultureLEVEL IIIMaterialsChick embryo (approximately 8 days old)70% (v/v) ethanol for swabbingSterile scis
Nucleolar－Isolation－Protocol2
7. Resuspend the pellet with 3 ml S1 solution (Figure 3). The pellet should be resuspended readily by pipetting up and down. A pellet that cannot be r
Mapping－Protein－Distributions－on－Polytene－Chromosomes－by－Immunostaining2
12. Hold the salivary glands at the common duct with tweezers.Transfer the glands to a drop of fixing solution on a siliconizedcoverslip. 13. Incubate
免疫荧光
Immunofluorescence Technique (Spector Lab)protocol for immunofluorescence on cells Immunofluorescence Protocol (Walter Steffen)Methanol fixationForma
明视野、暗视野、共轭焦显微镜仪器简介
明视野（brightfie1d）一一光学显微镜的标準配备,通常用来观察新鲜或活的标本。光线直接穿透过标本而呈像,但不易看到详细构造,若将标本用不同的染剂染色,可增加对比而使影像更清晰。 暗视野（dark field）一一光线经由某一个角度才穿透过标本,因此只能看到散布的光点。 相位差（phase-c
透射电子显微镜(Transmission－electron－microscopy,－TEM)
透射电镜具有很高的空间分辩能力，特别适合纳米粉体材料的分析。其特点是样品使用量少，不仅可以获得样品的形貌，颗粒大小，分布以还可以获得特定区域的元素组成及物相结构信息。透射电镜比较适合纳米粉体样品的形貌分析，但颗粒大小应小于300nm，否则电子束就不能透过了。对块体样品的分析，透射电镜一般需要对样品进
Histochemistry－－Introduction
A few cell types are thin enough to be viewed directly in a microscope (algae, protozoa, blood, tissue cultures), but most tissues (kidney, liver, bra
Dynamic－Flow－Assay－in－a－Parallel－Plate－Flow－Chamber
Dynamic Flow Assay in a Parallel Plate Flow ChamberJohn T. Patton~GlycoTech Corporation, Rockville, Maryland 20850Flow assays allow visualization of c
Live－imaging－with－Drosophila－tissue－culture－cells1
IntroductionLive imaging provides an important complementation to the "snapshot" view obtained in fixed tissue by immunofluorescence. It allows follow
直播预告|华威大学、新加坡国立大学等三位专家报告
直播时间：2024年5月28日（周二）20:00-22:00直播平台：科学网APPhttps://weibo.com/l/wblive/p/show/1022:2321325039041400668190（科学网微博直播间链接）科学网微博科学网视频号北京时间5月28日晚八点，iCANX Youth
Dark－Field－Viewing
Dark Field ViewingPrincipleTo view a specimen in dark field, an opaque disc is placed underneath the condenser lens, so that only light that is scatte
Interleukin6－Induced－Acute－Phenotypic－Microenvironment－Promote...（六）
Cryo-thermal therapy induced an “acute” phase response First, we performed PRM analysis upon significant proteins involved in acute phase response,
几种特殊显微镜的应用
1．荧光显微镜 （fluorescence microscope）是用来观察标本中的自发荧光物质或以荧光素染色或标记的细胞和结构。荧光显微镜是以高压汞灯产生的短波紫外线为光源，并配有激发、 阻断、吸热和吸收紫外线等滤片系统，标本中的荧光物质在紫外线激发下产生各种颜色的荧光，借以研究该荧光物质在细胞和