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Escaping the Heat
Deborah Fitzgerald | Nov 12, 2000 | 10+ min read
Nonradioactive Kinase Assay Kits Safety concerns and economic considerations have fueled a growing trend in the biomedical sciences: to shun the use of radioactivity when practical. Nonradioactive options for numerous applications have become widely available, including a number of nonradioactive kinase assay kits. Assays from different manufacturers employ a wide range of strategies. Most of these kits utilize antibodies, but two nonimmunochemical approaches use fluorescently tagged substrates
Assays Galore
Lanette Fee | Sep 21, 2003 | 9 min read
Courtesy of BD Biosciences Pharmingen  COLOR CODING: Multiplexed bead-based assays, like BD Biosciences' Cytometric Bead Array (shown), test for multiple analytes in a single vial. The key is in the colors: one hue indicates the bead ID, and the intensity of the second, how much protein has been captured. In today's fast-paced research environment, technologies for speedy, cost-efficient analyses reign supreme. As part of this general trend, techniques for multiplexing, that is, simultan
Array of Assays
Michael Brush | Oct 29, 2000 | 10 min read
Protein Assay Manufacturers and Products From the decades-old biuret reaction to the use of complicated fluorescent molecules, the search for an easy, reliable, and stable method for the quantitation of total protein in solution has gone on for more than 80 years. Although several famous, innovative, and useful techniques were developed over that time, the search continues. Bob Vigna, marketing manager for industry leader Pierce Chemical Co. of Rockford, Ill., confirms this observation. "The u
Assays by the Score
Deborah Fitzgerald | May 27, 2001 | 9 min read
Click to view the PDF file: Bead-based Fluorescent Multiplex Protein Analysis Systems Courtesy of LINCO ResearchLabMAP-based systems use internally dyed fluorescent microspheres to analyze as many as 100 different analytes concurrently. Today's competitive, high-paced research environment has stimulated the development of a host of approaches for rapid, cost-efficient analyses of large numbers of samples. In keeping with this trend, methods for simultaneously analyzing multiple species in a g
Luminescence Developments Help Scientists See The Light
James Kling | May 11, 1997 | 9 min read
Biologists are constantly seeking more sensitive assays to detect the presence of organisms or telltale DNA, RNA, and proteins. Although radioactive tags incorporated into the target itself (or into a complementary strand)-and later detected by Geiger counters or film exposures-have traditionally given good sensitivity, the problems of waste disposal and laboratory monitoring have driven a search for alternative tags that have radioactivity's sensitivity but avoid its hazards. Fluorescent tags-
Immunoassay Techniques Proven To Be Outstanding In Several Fields
Holly Ahern | Oct 1, 1995 | 10 min read
SIDEBAR: Selected Suppliers of Immunoassays and Assay Systems Immunoassays combine principles of immunology and chemistry into tests that are used by scientists in practically every discipline, including fields as diverse as molecular biology and environmental science. In research applications, immunoassays such as immunoblotting (detecting membrane-bound proteins), immunohistochemistry (cell or tissue staining), and enzyme immunoassays provide a sensitive and specific means of detecting targe
Beyond Film: Laboratory Imagers
Jorge Cortese | Apr 1, 2002 | 9 min read
Years ago, researchers had only one data-imaging option: autoradiography. These scientists tagged samples—whether nucleic acid, protein, cell, or tissue—with radioactive labels, and captured images on film. Safety concerns, convenience, and sensitivity, spurred the development of alternative techniques, and today, researchers can choose from a range of options, including fluorescence, chemifluorescence, and chemiluminescence, in addition to autoradiography. Fluorescence occurs when
Let It Shine
Jorge Cortese | Mar 19, 2000 | 9 min read
Fluorescence Detection Products Courtesy of BD PharMingenMulticolor immunofluorescent cell staining showing cell surface FITC (green) staining and intracellular PE (orange) and APC (red) staining. Is radioactive detection of biomolecules destined to the same fate as the Berlin Wall? The multitude of nonisotopic detection methods now available suggests that the 21st century may come to be billed as the "nonisotopic research century." The broadest common denominator of this up and coming cast of
Distinguishing Th1 and Th2 Cells
Jeffrey Perkel | May 13, 2001 | 10+ min read
Reagents That Distinguish Th1 and Th2 cells Courtesy of R&D SystemsSchematic representation of cytokines influencing the development of antigen-activated naive CD4+ T cells into Th1 and Th2 cells. Editor's note: Although individual techniques are associated with specific researchers in this article, it should be noted that these investigators commonly use several different techniques to analyze T lymphocyte populations. The human body is constantly under siege. It must defend itself fr
Field of Dreams
Aileen Constans | Jun 25, 2000 | 10+ min read
Magnetic Separation Systems Suppliers of Magnetic Microspheres for a Variety of Applications Labsystems' KingFisher Magnetic Particle Processor plunges into the magnetic separation scene. Since LabConsumer's last profile of magnetic bead technology, the use of paramagnetic particles in biological separations and detection has exploded.1 However, development of processing technologies has lagged behind refinements of the beads themselves. The instrumentation emerging within the last few years

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