Results 201 to 210 of about 79,190 (262)
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Fluorometer for endoscopic diagnosis of tumors
Medical Physics, 1984A filter fluorometer suitable for endoscopic applications has been developed for detection and characterization of superficial tumors by the fluorescence of a previously injected, tumor‐specific agent, hematoporphyrin derivative. Fluorescence is excited by violet light conducted through a fiberoptic lightguide in the endoscope, and the fluorescence ...
A E, Profio, D R, Doiron, J, Sarnaik
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A Spot Fluorometer for Protein Determination
Hoppe-Seyler´s Zeitschrift für physiologische Chemie, 1979An apparatus is described which allows spot fluorometry in situ for quantitative evaluation of protein spots stained with a fluorochrome (Hoechst 2495).
H G, Zimmer, F, Kiehl, V, Neuhoff
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Phase and modulation fluorometer
Journal of Scientific Instruments, 1961The instrument, which is designed for the measurement of fluorescence decay times of 10-7-10-9 s, comprises a 10 Mc/s hydrogen discharge lamp, fast photomultiplier, variable delay line and detector circuit for phase and modulation analysis of light signals from the lamp and specimen.
J B Birks, D J Dyson
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Design of a Clinical Fluorometer for Intraoral Use
The Journal of the American Dental Association, 1971A simple fluorometer has been designed for intraoral measurement of fluorescence. The instrument uses a mercury penlight source, fiber optics, filter, and a commercial detection system. Use of ultraviolet illumination for oral diagnosis is described in the preceding article.
J J, Hefferren, J B, Hall
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Handheld Fluorometers for Lab-on-a-Chip Applications
IEEE Transactions on Biomedical Circuits and Systems, 2009We describe the design, fabrication, and performance of a class of simple handheld fluorometers. The devices consist of a sensor along with an integrated optical filter packaged in a handheld format. The sensor is a differential active pixel sensor with in-pixel correlated double sampling fabricated in a 0.5-mu m 2-poly 3-metal complementary metal ...
Nicole M. Nelson +5 more
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A high precision fluorometer for biochemical measurements
Analytical Biochemistry, 1974Abstract Fluorometric biochemical analyses based on the enzyme coupled NAD-NADH reaction are limited in sensitivity by sample background fluorescence. An order of magnitude improvement in sensitivity has been achieved with a fluorometer designed to automatically measure sample fluorescence with high precision, before and after the enzymatic reaction,
J I, Peterson +2 more
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A handheld fluorometer for measuring cellular metabolism
2008 IEEE International Symposium on Circuits and Systems (ISCAS), 2008We demonstrate the application of a handheld fluorometer optimized for UV excitable assays. We demonstrate the measurement of metabolic products as yeast cells germinate in dextrose solution. In particular we measure NADH which is produced during cellular respiration.
Nicole M. Nelson +6 more
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A sensitive polarized fluorometer for clinical tests
IEEE Transactions on Instrumentation and Measurement, 1994A fully automated fluorometer which measures fluorescence depolarization is described. The instrument has been designed to work with standard microtiter sample holders normally used in clinical tests. The combination of a hybrid optical system, built with discrete optical elements and fiber bundles, and a digital Fourier analysis of the detected ...
P. Lago, ROVATI, Luigi, M. Corti
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Design of a nanoseconds time-resolved fluorometer
2010 20th International Conference on Electronics Communications and Computers (CONIELECOMP), 2010The development of an instrument to measure time-domain optical signals, produced by induced fluorescence is presented in this work. The instrument consists of two main subsystems: a) an optical one, which includes continuous and pulsed UV light sources, a Czerny-Turner type monochromator and a high sensitivity photo multiplier tube (PMT), and b) a ...
Edgar Moreno-García +2 more
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Journal of the Optical Society of America, 1941
A method is described for the measurement of the rise and decay of luminescence in phosphors excited by cathode-ray beams. It is particularly suited to the investigation of phosphors classed as fast, i.e., those in which major changes in intensity occur in a few microseconds.
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A method is described for the measurement of the rise and decay of luminescence in phosphors excited by cathode-ray beams. It is particularly suited to the investigation of phosphors classed as fast, i.e., those in which major changes in intensity occur in a few microseconds.
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