isosbestic point

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i·sos·best·ic point

in applied spectroscopy, a wavelength at which absorbance of two substances, one of which can be converted into the other, is the same.

i·sos·best·ic point

(ī'sos-bes'tik poynt)
applied spectroscopy A wavelength at which absorbance of two substances, one of which can be converted into the other, is the same.
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Fortunately, techniques such as those disclosed above can overcome this limitation because oxy- and deoxyhemoglobin have numerous isosbestic points in the visible spectral range, allowing blood vessels to be imaged with visible light.