Stepping-stone migration

As a summary of the ideas expressed in the chapters of this book some main conclusions arise several distribution patterns are described and different processes are hypothesised to explain them. Long-distance dispersal is evidently possible, but it is not the rule, as other distribution patterns can be explained by other mechanisms, such as continental drift, stepping-stone migration and anthropogenic introduction. 

The DNA bases most easily reduced are T and C, the reduction potentials of which are very similar [26]. It is therefore expected that excess electron migration through DNA occurs via a hopping mechanism involving all base pairs (C-G and T-A) and the radical anions C and T as stepping stones. We focused our work on 5-pyrenyl-2 -deoxyuridine (Py-dU) and 5-pyrenyl-2 -deoxycytidine (Py-dC) as nucleoside models for ET in DNA. Photoexcitation of the pyrenyl group results in... 

---