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Pollen tubes are tip growing plant cells that display oscillatory growth behavior. It has
been demonstrated experimentally that the reduction of the average pollen tube growth rate
through elevated extracellular calcium or borate concentrations coincides with a greater
amplitude of the growth rate oscillation and a lower oscillation frequency. We present a
simple numerical model of pollen tube growth that reproduces these results, as well as
analytical calculations that suggest an underlying mechanism. These data show that the
pollen tube oscillator is non-isochronous, and is different from harmonic oscillation.
Hydrogen diffusion in CuInSe 2 single crystals and CuInS2 thin films was studied by measuring the spreading of implantation profiles upon annealing. Deep implantation with an ion energy of 10 keV and sub-surface implantation with 300 eV were applied. The diffusion coefficients in both materials were found to be in the order of 10-14 to 10-13 cm2/s in the temperature range between 400 and 520 K.These fairly low diffusivities are typical for a trap and release transport process rather than intrinsic diffusion of interstitial hydrogen. In the polycrystalline CuInS2 films, hydrogen leaves the sample through the grain boundaries.
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