Electric-Magnetic Duality Invariant Lagrangians

We find general non-linear lagrangians of a U(1) field invariant under electric-magnetic duality. They are characterized by an arbitrary function and go to the Maxwell theory in the weak field limit. We give some explicit examples which are generalizations of the Born-Infeld theory.Comment: 15 pages, Latex, minor changes in the introduction, final version to be published in Nuclear Physics

Immunohistochemical Analysis of Histone H3 Modification in Newt Tail Tissue Cells following Amputation

Background. Newts have impressive regenerative capabilities, but it remains unclear about the role of epigenetic regulation in regeneration process. We herein investigated histone modifications in newt tail tissue cells following amputation. Methods and Results. Iberian ribbed male newts (6-8 months old) were suffered to about 1.5 cm length of amputation of their tails for initiating regeneration process, and the residual stump of tail tissues was collected for immunohistochemical analysis 3 days later. Compared to the tissue cells of intact tails, c-kit-positive stem cells and PCNA-positive proliferating cells were significantly higher in tails suffered to amputation (P<0.001). Amputation also significantly induced the acetylation of H3K9, H3K14, and H3K27 in cells of the tails with amputation (P<0.001), but did not significantly change the methylation of H3K27 (P=0.063). Conclusion. These results suggest that epigenetic regulation likely involves in newt tail regeneration following amputation

Demographic and Clinical Characteristics of Patients with Severe Asthma in the Asian Pacific Region : data from the International Severe Asthma Registry (ISAR)

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