Abstract
Thermal transition of core particle which occurs before melting of DNA and can be followed by circular dichroism is not a two-state process; it is the result of two processes which cannot be dissociated in static experiments: unfolding of core particles is immediately followed by their aggregation. It is thus impossible to get thermodynamic parameters of core particle unfolding from its thermal transition monitored by circular dichroism. Thermal denaturation kinetics of core particles gives some information about their stability. Finally core particle structure is more stable in chromatin than in its isolated state.
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