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Hamamatsu Corp. - Earth Innovations LB 2/24

Sensor Uses Qdots to Detect DNA

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BALTIMORE, Md., Dec. 6 -- Using tiny semiconductor crystals, biological probes and a laser, Johns Hopkins University engineers have developed a way to find specific sequences of DNA by making them light up beneath a microscope. The researchers, who say the technique will have important uses in medical research, demonstrated its potential in their lab by detecting a sample of DNA containing a mutation linked to ovarian cancer. The technique involves an unusual blend of organic and inorganic components.    Jeff Tza-Huei Wang, supervisor of the research team and senior author of a paper on...Read full article

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    Published: December 2005
    Glossary
    quantum dots
    A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
    cancer detectionDNA nanosensorMicroscopyNews & Featuresovarian cancerqdotsquantum dotssemiconductor crystalsSensors & Detectors

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