<unk> refers to any process which decreases the fluorescence intensity of a given substance. A variety of processes can result in<unk>  such as excited state reactions, energy transfer, complex-formation and collisional<unk>  As a consequence,<unk> is often heavily dependent on pressure and temperature. Molecular oxygen and the iodide ion are common chemical quenchers.<unk> poses a problem for non-instant spectroscopic methods, such as laser-induced fluorescence.<unk> is made use of in optode sensors; for instance the<unk> effect of oxygen on certain rubidium complexes allows the measurement of oxygen saturation in solution.<unk> and dequenching upon interaction with a specific molecular biological target is the basis for activatable optical contrast agents for molecular imaging.
Quenching 
Stretching
Twitching
Lamaze
Erection
Walking
Concussion
Burping