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fluorescence
Bowen fluorescence
Bowen fluorescence A mechanism that gives rise to certain strong emission lines from ionized atoms of oxygen, carbon, and nitrogen in diffuse nebulae. Extremely hot stars and accretion disks (at temperatures of 30 000 K or more) produce copious amounts of extreme ultraviolet radiation at 30.4 nm from singly ionized helium atoms. These photons excite the ions of C III and N III in surrounding gas because the ions have a transition very close to this wavelength. These excited ions then return to the ground state by emitting a series of photons, including a group of lines in the 464–465 nm (blue) region. Bowen fluorescence also accounts for the exceptionally strong O III lines in the spectra of some
planetary nebulae. The mechanism was identified by I. S.
Bowen.
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Fluorescence intensity and lifetime distribution analysis: Toward higher accuracy in fluorescence fluctuation spectroscopy
Magazine article from: Biophysical Journal; 8/1/2002; ; 700+ words
; ABSTRACT Fluorescence fluctuation methods such as fluorescence correlation spectroscopy and fluorescence intensity distribution analysis (FIDA) have proven to be versatile tools for studying molecular interactions with single molecule sensitivity...
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Quantitating fluorescence intensity from fluorophore: the definition of MESF assignment.
Magazine article from: Journal of Research of the National Institute of Standards and Technology; 1/1/2002; ; 700+ words
; The quantitation of fluorescence radiance may at first suggest the need...that are responsible for the measured fluorescence radiance. This goal is beset by many difficulties since the fluorescence radiance depends on three parameters...
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Fluorescence spectral imaging of dihydroxyacetone on skin in vivo[para]
Magazine article from: Photochemistry and Photobiology; 5/1/2003; ; 700+ words
; ...dansyl chloride for use as a fluorescence marker on skin to assess stratum...time in vivo. However, the fluorescence from DHA on skin has not been...is used to characterize the fluorescence spectrum of DHA on skin in...
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Fluorescence properties of recombinant tropomyosin containing tryptophan, 5-hydroxytryptophan and 7-azatryptophan
Magazine article from: Photochemistry and Photobiology; 11/1/1999; ; 700+ words
; ...expressed in Escherichia coli and their fluorescence properties studied. The fluorescent...to that of the probe in water. The fluorescence anisotropy decays are single exponential...time constant of 2-3 ns while the fluorescence lifetimes of the probes incorporated...
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Fluorescence imaging of single cells may give more contrast than other methods.
Newspaper article from: Clinical Oncology Week; 1/12/2004; 700+ words
; ...NewsRx.com & NewsRx.net) -- Fluorescence imaging of single cells or the cell...more contrast than volume-averaged fluorescence measurements of cells in suspension...research from the United States, "The fluorescence of tryptophan, reduced nicotinamide...
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Fluorescence research grows on all fronts: government and academic research labs are advancing fluorescence-based spectroscopy for medical and military applications.
Magazine article from: R & D; 3/1/2005; ; 700+ words
; KEYWORDS Fluorescence * Optics * Spectroscopy Fluorescence spectroscopy remains a powerful analytical technique...Hazlett, director of the NIH-funded Laboratory for Fluorescence Dynamics (LFD) at the Univ. of Illinois, Urbana...
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Fluorescence quenching of phenanthrene and anthracene by maleic anhydride and n-octadecenylsuccinic anhydride in solution and in bulk polypropylene.
Magazine article from: Polymer Engineering and Science; 2/1/2007; ; 700+ words
; INTRODUCTION Fluorescence quenching of polyaromatic molecules...dynamic (collisional) and static fluorescence quenching mechanisms were developed...function of the fluorophore used, its fluorescence lifetime, and the quencher diffusion...
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Fluorescence Properties of Fluorescein, Tetramethylrhodamine and Texas Red Linked to a DNA Aptamer¶
Magazine article from: Photochemistry and Photobiology; 5/1/2005; ; 700+ words
; ...report the picosecond time-scale fluorescence dynamics of a dye-labeled DNA oligonucleotide...oligonucleotide structure and dynamics. The fluorescence decay of the TR-aptamer is a simple...a weak temperature dependence. The fluorescence decay of the fluorescein-aptamer...
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The Fluorescence Properties of Hypocrellin B and its Amino-substituted Derivative: Photoinduced Intramolecular Proton Transfer and Photoinduced Intramolecular Electron Transfer¶
Magazine article from: Photochemistry and Photobiology; 7/1/2004; ; 700+ words
; ...highly solvent polarity-dependent fluorescence in the useful region (680-730 nm...process are considered relevant for the fluorescence properties of HB and EDAHB, respectively...The corresponding properties of the fluorescence spectra, though important for interpreting...
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Endogenous Fluorescence Spectroscopy of Cell Suspensions for Chemopreventive Drug Monitoring¶
Magazine article from: Photochemistry and Photobiology; 1/1/2005; ; 700+ words
; ...available. In this study endogenous fluorescence spectroscopy was used to measure metabolic...ovarian and bladder cancer cell lines. Fluorescence signals consistent with nicotinamide...stable environment with a sensitive fluorescence spectrometer. Results suggest that...
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Fluorescence
Encyclopedia entry from: The Gale Encyclopedia of Science
Fluorescence Fluorescence is the process by which a substance absorbs electromagnetic radiation...and in certain liquids and solids, such as the ruby gemstone. Fluorescence is the principle that is the basis of the common fluorescent lamp...
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fluorescence
Book article from: A Dictionary of Astronomy
fluorescence The emission of light from a gas whose atoms have been excited by a source of higher...photons, usually at visible or infrared wavelengths. Nebulae glow as a result of fluorescence. See also Bowen Fluorescence .
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Bowen fluorescence
Book article from: A Dictionary of Astronomy
Bowen fluorescence A mechanism that gives rise to certain strong emission lines from...in the 464–465 nm (blue) region. Bowen fluorescence also accounts for the exceptionally strong O III lines in the spectra...
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fluorescence in situ hybridization
Book article from: A Dictionary of Biology
fluorescence in situ hybridization ( FISH ) A technique in which a DNA probe, labelled with a fluorescent dye, base-pairs (hybridizes...
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Fluorescence in Situ Hybridization (Fish)
Book article from: World of Microbiology and Immunology
Fluorescence in situ hybridization (FISH) Fluorescent in situ hybridization (FISH) is a technique in which single-stranded nucleic acids...
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