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PdCuAu ternary alloy samples with different composition were synthesized on top of ZrO 2 -modified porous stainless steel disks by the sequential electroless deposition technique. The structure, morphology and bulk composition of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (EDX). Complete alloy formation with a pure fcc phase for the Pd 71 Cu 26 Au 3 , Pd 70 Cu 25 Au 5 and Pd 67 Cu 24 Au 9 samples and a bcc structure for the Pd 62 Cu 36 Au 2 and Pd 60 Cu 37 Au 3 samples were obtained upon annealing at 500°C for 120 h as revealed by XRD. A combination of low-energy ion scattering (LEIS) and X-ray photoelectron spectroscopy (XPS) was used to investigate the surface properties of the PdCuAu alloys. XPS results confirmed alloy formation under the annealing conditions. XPS analysis also revealed that the near-surface regions of the alloys became enriched in Pd with respect to the bulk composition determined by EDX. In contrast, LEIS and angle-resolved XPS analyses showed that the top-most surface layers in all samples were copper-rich compared with the bulk composition. This high Cu surface concentration could impart resistance to bulk sulfide formation to the PdCuAu alloy membranes.

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The study of the cephalic shape of crocodilian is relevant in the fields of ecology, systematics, evolution, and conservation. Therefore, the integration of geometric analysis within quantitative genetics allows the evaluation of the inheritable shape components. In this study, the dorsal cephalic region of 210 Caiman latirostris hatchlings was analyzed from seven populations in Santa Fe, Argentina, to detect intra-, and inter-population phenotypic variability, and to determine the heritability of biological shape and size, using newly available geometric morphometric tools. The principal component analysis showed two configurations of cephalic shape that could be related to sexual dimorphism. In the canonical variate analysis, Procrustes distances between groups indicated that there are differences in shape among populations. Furthermore, the method of partial least squares indicated a covariation between cephalic shape and environmental variables. Regarding to CS of the skull we found significant differences among populations, moreover the partial least squares was also significant. Estimates of the heritability of shape and size were high, indicating that the components of these features are susceptible to the selection.