Results 141 to 150 of about 86,147 (197)

A high precision fluorometer for biochemical measurements

Analytical Biochemistry, 1974
Abstract 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, W S, Friauf, S B, Leighton   +2 more
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A handheld fluorometer for measuring cellular metabolism

2008 IEEE International Symposium on Circuits and Systems (ISCAS), 2008
We 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, David Sander, Marc Dandin, Anshu Sarje, Somashekar Prakash, Honghao Ji, Pamela Abshire   +6 more
openaire   +2 more sources

Design of a nanoseconds time-resolved fluorometer

2010 20th International Conference on Electronics Communications and Computers (CONIELECOMP), 2010
The 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, José M. de la Rosa-Vázquez, Porfirio Reyes-López   +2 more
openaire   +1 more source

Design of a Clinical Fluorometer for Intraoral Use

The Journal of the American Dental Association, 1971
A 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
openaire   +2 more sources

Handheld Fluorometers for Lab-on-a-Chip Applications

IEEE Transactions on Biomedical Circuits and Systems, 2009
We 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, David Sander, Marc Dandin, Somashekar Bangalore Prakash, Anshu Sarje, Pamela Abshire   +5 more
openaire   +3 more sources

A Supersonic Cell Fluorometer

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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Phase fluorometer for measurement of picosecond processes

Review of Scientific Instruments, 1978
Time-dependent fluorescence processes can be investigated using a phase fluorometer with variable frequency. The high cutoff frequency of 500 MHz leads to a time-resolving power of about 1 ps.
H P, Haar, M, Hauser
openaire   +2 more sources

Fiberoptic Fluorometer for Skin Flap Assessment

Otolaryngology–Head and Neck Surgery, 1983
The fiberoptic fluorometer permits quantitative measurement of fluorescence after intravenous administration of fluorescein. Accurate assessment of tissue fluorescence can be made at any time after the injection, and both uptake and elimination of fluorescein can be followed.
R A, Weisman, D G, Silverman
openaire   +2 more sources

Fluorometer to spectrophotometer converter

Review of Scientific Instruments, 1996
A simple accessory has been constructed that will convert a standard laboratory spectrofluorometer into a spectrophotometer. This attachment fits within the sample compartment of a spectrofluorometer and consists of a cuvette holder, two mirrors, and two collimators.
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Tooth Fluorometer

The Journal of the American Dental Association, 1963
A F, FORZIATI, J W, KUMPULA, J J, BARONE
openaire   +2 more sources