assays Protocols

Category: Pharmacology and Toxicology Protocols: Enzyme Assays Protocols

Protocol for 3/7 assay. Includes: Detection of Caspase-3 and -7 Activities in Cell-Based Assays; Detection of Caspase-3 or -7 Activity Using Purified Caspases. - [Read 3-7 Assay Protocol]

Category: Protein Protocols: Protein Ubiquitination Protocols

A specific endpoint assay for ubiquitin. Rose et al., Proc Natl Acad Sci U S A. 1987. Simple endpoint assays for free ubiquitin (Ub) and for the Ub-activating enzyme are described. . - [Read A specific endpoint assay for ubiquitin.]

Category: Protein Protocols: Protein Quantitation Concentration Protocols

Absorbance assays are fast and convenient, since no additional reagents or incubations are required.  No protein standard need be prepared.  The assay does not consume the protein.  The relationship of absorbance to protein concentration is linear.  Because different proteins and nucleic acids have widely varying absorption characteristics there may be considerable error, especially for unknowns or protein mixtures. - [Read Absorbance Assay 280 nm]

Category: Cytoskeleton Protocols: Actin Myosin Protocols

Protocol includes: Binding assays for tropomyosin, villin or caldesmon and Bundling Assays - [Read Actin Binding & Bundling Sedimentation Assays]

Category: Cell Biology and Cell Culture: Endothelial Cell Protocols

Traditional animal models to quantify the degree of blood vessel formation are being replaced by cell culture assays that are easier to set up, statistically reliable and can be automated in a drug screening laboratory. These assays rely on the endothelial cells’ ability to form distinct blood-vessel-like tubules in an extracellular matrix where they can subsequently be visualized by fluorescence microscopy. - [Read An Image-Based Assay of Endothelial Cell Tube Formation as a Model of Angiogenesis]

Category: Reporter Gene Assays: B-Galactosidase Assay Protocols

There are two basic methods for the in vitro assay of B-galactosidase activity from yeast. They differ mainly in the method of preparing the material for assay. Both methods are described with accompanying protocols. Method I: Assay of Crude Extracts includes: Yeast Cell Growth; Yeast Cell Harvest; B-gal assays; Bradford Assays. Method II: Permeabilized cell assay. - [Read Assay of β-Galactosidase in Yeast Protocol]

Category: Yeast Protocols: Yeast Genetics Protocols: B-Galactosidase Assay Protocols

Protocol for assay of β-Galactosidase in Yeast. Includes: Assay of Crude Extracts; Yeast Cell Growth; Yeast Cell Harvest; β-gal assays; Bradford Assays; Permeabilized cell assay. - [Read Assay of β-Galactosidase in Yeast Protocol]

Category: Immunology: B Cell Protocols

Describes the antigenic stimulation of in vitro antibody production by B cells and the subsequent measurement of secreted antibodies. The first protocol is a generalized system for inducing in vitro antibody production and can accommodate various types of antigens under study. Secreted antibodies can then be measured with an enzyme-linked immunosorbent assay (ELISA) or other soluble-antibody detection systems. - [Read Assays for B Lymphocyte Function Protocols]

Category: Cell Biology and Cell Culture: Cell Viability Protocols

Protocol and methods on assays to detect apoptosis. - [Read Assays to Detect Apoptosis Protocol]

Category: Cell Biology and Cell Culture: In Vitro Reconstitution Protocols

The ability to synthesize RNA in the lab is critical to many techniques.Radiolabeled and nonisotopically labeled RNA probes, generated in small scale transcription reactions can be used in blot hybridizations and nuclease protection assays. This article includes information on: Requirements For Transcription, RNA Phage Polymerases, Template Options: Plasmids, PCR Products, Oligonuclotides and cDNA, Sense or Antisense, Conventional Or Large Scale Synthesis, Products for In Vitro Transcription. - [Read Basic Information on In Vitro Transcription]

Category: Molecular Biology Protocols: Carbohydrate Protocols

o determine the relative amounts of LPS carbohydrates present in a given strain. The assay can be done on one set of samples and then scanned at the various wavelengths for reasonable data on the 3 types of sugars. HEXOSE ASSAY, 6-DEOXYHEXOSE ASSAY, HEPTOSE ASSAY. Hancock Laboratory. - [Read Carbohydrate Assays]

Category: Pharmacology and Toxicology Protocols: Enzyme Assays Protocols

Protocol for caspase 8 assay. Includes: Detection of Caspase-8 Activity Using Purified Caspases; Detection of Caspase-8 Activity in Cell-Based Assays. - [Read Caspase 8 Assay Protocol]

Category: Pharmacology and Toxicology Protocols: Enzyme Assays Protocols

Protocol for caspase 9 assay. Includes: Detection of Caspase-9 Activity Using Purified Caspases; Detection of Caspase-9 Activity in Cell-Based Assays. - [Read Caspase 9 Assay Protocol]

Category: Reporter Gene Assays: Cat Assays Protocols

Two protocols describing CAT assays. - [Read CAT Assay Protocols]

Category: Cell Biology and Cell Culture: Cell Viability Protocols

The CellTiter-Glo® Luminescent Cell Viability Assay is a homogeneous method to determine the number of viable cells in culture. Detection is based on using the luciferase reaction to measure the amount of ATP from viable cells. The amount of ATP in cells correlates with cell viability. - [Read Cell Viability Assays that Measure ATP Protocol]

Category: Cell Biology and Cell Culture: Cell Viability Protocols

The CellTiter-Blue® Cell Viability Assay uses an optimized reagent containing resazurin. The homogeneous procedure involves adding the reagent directly to cells in culture at a recommended ratio of 20µl of reagent to 100µl of culture medium. - [Read Cell Viability Assays that Measure Metabolic Capacity Protocol]

Category: Cell Biology and Cell Culture: Cell Viability Protocols

Choosing a cell viability or cytotoxicity assay from among the many different options available can be a challenging task. Includes information on: Establishing an In Vitro Model System; Choosing an Endpoint to Measure; Characterizing Assay Responsiveness; Determining Dose and Duration of Exposure; Homogeneous Assays for Multiwell Formats and Automated Screening; Additional Factors to Consider When Choosing a Cell Viability Assay; Cell Viability Assays that Measure ATP Protocol; etc.. - [Read Cell Viability Information For Protocols and Applications]

Category: DNA Protocols: Chromatin Immunoprecipitation Protocols

Formaldehyde cross-linking and chromatin immunoprecipitation assays of tissue culture cells, Based on Boyd and Farnham. Michelle Kallesen, Rosen Lab. - [Read ChIP Assay Protocol PDF]

Category: Pharmacology and Toxicology Protocols: Cytotoxicity Protocols: Cytotoxicity Assays in Cell Culture Protocols

The potential cytotoxicity of compounds under hypoxic conditions is determined by exposing cell cultures to test compounds in a low oxygen atmosphere.  Subsequent cell survival is determined by the MTT and methylene blue colorimetric assays. - [Read Colorimetric Cytotoxcity Assays for Anchorage Dependent Cells Protocol]

Category: Pharmacology and Toxicology Protocols: Enzyme Assays Protocols

Protocol for Cytochrome P450. Includes: Microsome Assays General; General Reaction Conditions; Specific Substrates for Cytochrome P450 Isozymes. - [Read Cytochrome P450 Recombinant Enzyme Microsome Protocol]

Category: Signalling Signal Transduction Protocols: Cytokine Protocols

Cytokine Enzyme-linked immunosorbent spot (ELISPOT) assays. Cytokine ELISPOT Buffers and procedure protocol. - [Read Cytokine ELISPOT (Enzyme-linked ImmunoSPOT) Protocols]

Category: Cell Biology and Cell Culture: Apoptosis Protocols

Detection of apoptotic process in situ using immunocytochemical and TUNEL assays. Barbieri et al. Purdue Cytometry CD-ROM Series - [Read Detection of apoptotic process in situ using immunocytochemical]

Category: Cell Biology and Cell Culture: Flow Cytometry Protocols: Cell Cycle Analysis Protocols

Describes assays used to determine the distribution of a population of cells to the different stages of the cell cycle as analyzed by flow cytometry. Staining the DNA with different fluorescent dyes, propidium iodide or DAPI, is one of the most direct ways of staging the cells based on DNA content. - [Read Determining Cell Cycle Stages by Flow Cytometry Protocol]

Category: Cell Biology and Cell Culture: Cell Viability Protocols

Cell-based assays are important tools for contemporary biology and drug discovery because of their predictive potential for in vivo applications.This assay gives ratiometric, inversely proportional values of viability and cytotoxicity (Figure 4.15) that are useful for normalizing data to cell number. Also, this reagent is compatible with additional fluorescent and luminescent chemistries. - [Read Determining Number of Live and Dead Cells in Cell Population: Cytotoxicity Assay Protocol]

Category: Immunology: Chemotaxis

Drosophila Larval Chemotaxis Assays. Larva harvesting. Olfactory tests on control larvae. Measuring response. Leslie Vosshall Laboratory, Rockefeller University, New York. - [Read Drosophila Larval Chemotaxis Assays]