A characteristic property of a complex system is inhomogeneity; it can assume many different conformations, or as we call them “conformational substates .” Glasses are typical examples. Proteins clearly are complex and it is ludicrous to assume that they exist in a unique structure, each atom exactly in a unique position. Here we discuss states and substates and present some of the evidence for conformational substates . Detailed discussion of more experimental and theoretical support for the concept can be found in reviews [1, 2].
KeywordsBarrier Height Energy Landscape Hole Burning Heme Pocket Spectral Hole Burning
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