Acceptor Sensitized Emission
Acceptor Sensitized Emission - Related Videos
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18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor (SiFA) for Positron Emission Tomography
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Cited by 3 •
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The synthesis of fluorine-18 (18F) labeled radiopharmaceuticals for positron emission tomography typically requires months of experience. When incorporated into a radiotracer, the silicon-fluoride acceptor (SiFA) motif enables a simple 18F-labeling protocol that is independent of costly equipment and preparatory training, while reducing precursor quantity needed and utilizing milder reaction conditions.
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Design and Use of a Full Flow Sampling System (FFS) for the Quantification of Methane Emissions
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We have designed, developed, and implemented a novel full flow sampling system (FFS) for quantification of methane emissions and greenhouse gases from across the natural gas supply chain.
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Emission Spectra
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2020
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present. In contrast to continuous spectra, light can also occur as discrete or line spectra having very narrow linewidths interspersed throughout the spectral regions. Exciting a gas at low partial pressure using an electrical current,...
09:15
Assessing Protein Interactions in Live-Cells with FRET-Sensitized Emission
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2021
Förster Resonance Energy Transfer (FRET) between two fluorophore molecules can be used for studying protein interactions in the living cell. Here, a protocol is provided as to how to measure FRET in live cells by detecting sensitized emission of the acceptor and quenching of the donor molecule using confocal laser scanning microscopy.
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Metal Flame Emission - Concepts
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2020
Metal Flame Emission Flame testing is an analytical technique where a sample is placed in a flame, and the characteristic flame color is used to identify the substance. Each element has a characteristic light emission when placed into a flame, meaning each element produces a unique color. This phenomenon is used in fireworks displays, where the color of the fireworks corresponds to a specific characteristic of a metal. The emission of colored light from a burning sample is the direct result of...
FAQs
During donor excitation, a nearby acceptor can receive excitation energy without the donor emitting a photon. The acceptor then relaxes by fluorescence and produces light at a longer wavelength. This sequence converts a nanoscale donor-acceptor relationship into a measurable optical signal, allowing proximity to be followed through acceptor-channel intensity.
Quantification must account for two signals that can imitate energy transfer: acceptor fluorescence caused by direct acceptor excitation and donor fluorescence that leaks into the acceptor detection channel. Correcting for both contributions isolates emission attributable to sensitization, reducing misleading interpretations of molecular proximity and improving comparisons among samples or experimental conditions.
A change in sensitized emission can report altered donor-acceptor proximity, helping reveal conformational changes or changing molecular associations rather than only a static interaction. In biological experiments, measuring this signal under different conditions can connect molecular rearrangement with biosensor responses or dynamic interactions in cells, provided optical corrections are applied consistently.
A basic measurement places donor and acceptor labels on the molecules or structures of interest, excites the donor, and records fluorescence from the acceptor at its longer wavelength. The measured signal is then corrected for direct acceptor excitation and donor fluorescence leaking into the detection channel before researchers quantify sensitized emission.
This approach is useful when researchers need to examine protein associations, conformational changes, or responses from fluorescent biosensors. It also supports studies of dynamic molecular interactions in cells and other biological samples, where changes in donor-acceptor proximity can be monitored through corrected acceptor fluorescence rather than inferred only from separate labeling signals.
Corrected acceptor emission provides a measurable readout associated with the spatial relationship between donor and acceptor labels. Comparing that readout across biological conditions can help assess protein association, conformational rearrangement, biosensor response, or changing cellular interactions. Interpretation depends on removing contributions from direct acceptor excitation and donor signal leakage.