Journal: Quantum Dots Reveal Minute Details of Brain Chemistry for First Time; French Researchers Report Tracking of Single-Molecule Properties in Living Cells.Business Editors/Health/Medical Writers BIOWIRE2K HAYWARD, Calif.--(BUSINESS WIRE)--Oct. 20, 2003 French researchers have used a new imaging tool, the size of individual molecules, to reveal more clearly than ever before the workings of the human nervous system -- including processes that may eventually provide clues to treating common neurological disorders. In a study published in the October 17 issue of the journal Science, the researchers reported they used quantum dots developed and manufactured by Hayward-based Quantum Dot Corporation (QDC QDC Quality, Delivery, Cost QDC Quiet-Day-Curve QDC Qatar Distribution Company QDC Quantum Data Compression QDC Qatar Data Center QDC Quadratic Double Circulant (code) QDC Quantized Dc QDC Quick Direct Connect ) to track the movements of individual glycine receptor molecules in the membranes of living cells. The results mark the first time researchers have been able to track single-molecule properties in living cells for extended periods within a single experiment. "This significant study again validates the importance of quantum dots for biomolecular imaging and drug development," said Carol Lou, president of QDC. "Our Qdot(TM) conjugates give researchers a powerful new tool in the quest to develop new drugs that can successfully treat human neurological disorders and other diseases." Older imaging tools such as fluorescent dyes or polymer spheres are either too unstable or too big to effectively perform single-molecule tracking, the scientists wrote. QDC's Qdot conjugates, by contrast, produced photo resolutions up to eight times more detailed than the older imaging tools. The Qdot conjugates also proved to be "almost an order of magnitude A change in quantity or volume as measured by the decimal point. For example, from tens to hundreds is one order of magnitude. Tens to thousands is two orders of magnitude; tens to millions is three orders of magnitude, etc. " brighter than fluorescent dyes, and could be observed for as long as 40 minutes compared to about 5 seconds for the dyes, the French scientists reported. Length of observation time is critical to studying cellular processes, which change rapidly over a span of several minutes. Quantum dots are nanoscale crystals of semiconductor material that glow, or fluoresce fluo·resce intr.v. fluo·resced, fluo·resc·ing, fluo·resc·es To undergo, produce, or show fluorescence. [Back-formation from fluorescence. when excited by a light source such as a laser. They are used by life science researchers as tiny beacons or markers, allowing them to easily see individual genes, nucleic acids Nucleic acids The cellular molecules DNA and RNA that act as coded instructions for the production of proteins and are copied for transmission of inherited traits. , proteins or small molecules. Qdot conjugates work by seeking out and bonding with target materials. Once bonded with a target, each individual Qdot particle emits light. Depending on their size, they can glow in a variety of colors and are up to 1,000 times brighter than fluorescent dyes. The study is one of several recent reports to validate the superior imaging qualities of Qdots. Researchers at Cornell and QDC announced in May they had used Qdot particles to see deeply into the tissues of living mice. That report was also published in Science. The new report, titled "Diffusion Dynamics of Glycine Receptors Revealed by Single-Quantum Dot Tracking," was jointly authored by Maxime Dahan, Sabine Levi, Camilla Luccardini, Philippe Rostaing, Beatrice Riveau, and Antoine Triller Triller can refer to:
Pierre Curie, 1859–1906, scientist, and his wife, Marie Sklodowska Curie, 1867–1934, chemist and physicist, b. in Paris. Cellular receptors are a critical target studied by scientists who develop new drug candidates for diseases including neurological disorders such as epilepsy and depression. More detailed understanding of the behavior of these receptors can open up new treatment options. The glycine receptors in the current report are the main inhibitory neurotransmitter in the human spinal cord spinal cord, the part of the nervous system occupying the hollow interior (vertebral canal) of the series of vertebrae that form the spinal column, technically known as the vertebral column. and brain stem. The full text of the Science article is available for purchase on the Science website www.sciencemag.org. High-resolution images and video, are available at: http://www.sciencemag.org/cgi/content/abstract/302/5644/442 About Quantum Dot Corporation Founded in 1998, Quantum Dot Corporation and its advisors are the world's leading experts in semiconductor nanocrystal (Qdot(TM)) technology and its application in biology. QDC markets and sells Qdot nanocrystal products worldwide, directly and through distributors. QDC has a dominant and extensive patent position covering quantum dot compositions, synthesis methods, and methods of use. QDC is the exclusive licensee, in the field of biological applications, of pioneering intellectual property licensed from the University of California The University of California has a combined student body of more than 191,000 students, over 1,340,000 living alumni, and a combined systemwide and campus endowment of just over $7.3 billion (8th largest in the United States). , MIT MIT - Massachusetts Institute of Technology , Indiana University, and the University of Melbourne
In 2006, Times Higher Education Supplement ranked the University of Melbourne 22nd in the world. Because of the drop in ranking, University of Melbourne is currently behind four Asian universities - Beijing University, . |
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