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Jablonski diagram of FRET with typical timescales indicated. The black dashed line indicates a virtual photon.. Förster resonance energy transfer (FRET), fluorescence resonance energy transfer, resonance energy transfer (RET) or electronic energy transfer (EET) is a mechanism describing energy transfer between two light-sensitive molecules (chromophores). [1]
Free spectral range (FSR) is the spacing in optical frequency or wavelength between two successive reflected or transmitted optical intensity maxima or minima of an interferometer or diffractive optical element.
The twelfth root of two or (or equivalently /) is an algebraic irrational number, approximately equal to 1.0594631.It is most important in Western music theory, where it represents the frequency ratio (musical interval) of a semitone (Play ⓘ) in twelve-tone equal temperament.
Fanned-fret guitars have a multi-scale fingerboard because of "offset" frets; that is, frets that extend from the neck of the guitar at an angle. Ralph Novak (Novax Guitars) was the first to apply this idea to the electric guitar (1988). [2] The frets are arrayed on an angle, in contrast to the standard perpendicular arrangement of other guitars.
where FRET is the FRET efficiency of the two-dye system at a period of time, and are measured photon counts of the acceptor and donor channel respectively at the same period of time, and are the photon collection efficiencies of the two channels, and are quantum yield of the two dyes, and is a correction to the different intrinsic brightness of ...
Time-resolved fluorescence energy transfer (TR-FRET) is the practical combination of time-resolved fluorometry (TRF) with Förster resonance energy transfer (FRET) that offers a powerful tool for drug discovery researchers. TR-FRET combines the low background aspect of TRF with the homogeneous assay format of FRET. The resulting assay provides ...
Fat frets make bending easier, and they change the feel of the guitar. As well, large frets, offering more metal, remain playable much longer than thin frets. A side effect of a thicker fret is a less precise note, since the string is held over a wider surface, causing a slight inaccuracy of pitch, which increases in significance as frets wear. [2]
The fret number, which shows the position of the node in terms of half tones (or frets on a fretted instrument) then is given by: F = log s m m − n {\displaystyle F=\log _{s}{\frac {m}{m-n}}} With s equal to the twelfth root of two , notated s because it's the first letter of the word "semitone".