Abstract
Since excited singlet species can be formed in biological systems (bioluminescence), the question arises as to whether triplet species can also be formed biochemically. Electronically excited triplet species have an intrinsic lifetime which is much longer than that of singlet species, whereby they may potentially be much more useful. This raises a second question; if triplet species are formed, do they have a functional role? This question is of special importance since there are several photochemical-like processes which occur in vivo in the complete absence of light |1|. Substantial progress in the search for biochemically generated triplet species was made only as of the late seventies; the available |2–5| reviews contain references pertaining to a possible role of excited states in biological processes as considered by other authors.
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