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The problem of the weak-interaction cutoff A has been studied with the universal current-current theory (UFI) and the intermediate-vector-boson (IVB) model, using the Bjorken technique to treat the highenergy behavior and the "hard meson" technique of Weinberg and Schnitzer. With these methods, the most divergent contributions to the second-order weak decay K L° -> vfi and K L°-Ks° mass difference Am are essentially independent of strong interaction. From K L°-> ixjx decay, A < 35-100 BeV, and from Am, A~3-4 BeV. With this latter value of A, the predicted rate of K L° -• /*£ is reduced to a value obtained by Beg treating this process as first-order in weak and second-order in electromagnetic interaction. The Beg calculation is redone with the algebra of currents, and the soft-kaon contribution to K L° -> A*M is calculated with both the UFI and IVB models. A possible origin of the low value of A deduced from Am is discussed.

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By using the Jensen-Shannon divergence, genomic DNA can be divided into compositionally distinct domains through a standard recursive segmentation procedure. Each domain, while significantly different from its neighbours, may however share compositional similarity with one or more distant (nonneighbouring) domains. We thus obtain a coarse-grained description of the given DNA string in terms of a smaller set of distinct domain labels. This yields a minimal domain description of a given DNA sequence, significantly reducing its organizational complexity. This procedure gives a new means of evaluating genomic complexity as one examines organisms ranging from bacteria to human. The mosaic organization of DNA sequences could have originated from the insertion of fragments of one genome (the parasite) inside another (the host), and we present numerical experiments that are suggestive of this scenario.

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