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We apply canonical Poisson-Lie T-duality transformations to bosonic open string worldsheet boundary conditions, showing that the form of these conditions is invariant at the classical level, and therefore they are compatible with Poisson-Lie T-duality. In particular the conditions for conformal invariance are automatically preserved, rendering also the dual model conformal. The boundary conditions are defined in terms of a gluing matrix which encodes the properties of D-branes, and we derive the duality map for this matrix. We demonstrate explicitly the implications of this map for D-branes in two non-Abelian Drinfel'd doubles.

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The (tracer) diffusion coefficient D has been measured by Mundy in Na, for various pressures up to 9.46 kbar, at T = 288 K. The plot In D versus P showed a strong curvature, which has been previously attributed to the coexistence of various diffusion mechanisms. By following the theory described in the accompanying paper, we calculate the local com-pressibility~',of a single vacancy and we find that it exceeds the bulk one by a factor of 2-3.Therefore an important factor of the form exp Ji d d P has possibly been disregarded in the previous analysis of the curve In D versus P. Considering the correction introduced by such a factor, we confirm that the curvature in the isothermal plot In D versus P is exclusively due to the vacancy high local compressibility, over all the pressure range. Our mean x'-value, calculated only from bulk properties, is in striking agreement with a recent analysis made by Gilder and Lazarus.

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