Characterization of Er in porous Si

The fabrication of porous Si-based Er-doped light emitting devices is a very promising developing field for all-silicon light emitters. However, while luminescence of Er-doped porous silicon devices has been demonstrated, very little attention has been devoted to the doping process itself. We have undertaken a detailed study of this process examining the porous silicon matrix from several points of view, during and after the doping. In particular, we have found that the Er doping process shows a threshold level which, as evidenced by the cross correlation of the various techniques used, does depend on the sample thickness and on the doping parameters

Transfer of metal ions at the soil-root interface: role of VO²⁺ on Fe³⁺ mobilization from a Fe(III)-network

This note reports the role of VO(IV) on Fe(III) mobilization from a Fe(III)-polygalacturonate network. The effect of the reaction on the physical properties of the system is also considered

Gunningsmethodieken voor uitzendwerk

Een analyse van grote overheidsopdrachten voor uitzendwerk laat zien dat het prijscriterium in veel aanbestedingen meer aandacht krijgt dan de opdrachtgever beoogt. Onderzoekers Wouter Lohmann, Elisabetta Manunza en Jan Telgen analyseren de elementen die dit effect veroorzaken vanuit zowel economisch als juridisch oogpun

I materiali ceramici provenienti dal'US 5 del sito di Carzeranu (Settimo S. Pietro-Cagliari)

The paper concerns the pottery from US5 of the roman settlement of Carzeranu, Settimo San Pietro (near Cagliari). The site are characterized by handcrafts and residential structures. The analysis of finds from US5 show the presence of coarse and fine wares from punic age to late antiquity (Terra Sigillata, African Red Slip, Black Glaze pottery, Thin-Walled pottery, amphorae and coarse wares)

A High Throughput Genotyping Approach Reveals Distinctive Autosomal Genetic Signatures for European and Near Eastern Wild Boar

Manunza, Arianna et al.The lack of a Near Eastern genetic signature in modern European porcine breeds indicates that, although domestic pigs from the Fertile Crescent entered Europe during the Neolithic, they were completely replaced by their European counterparts in a short window of time. Whilst the absence of such genetic signature has been convincingly demonstrated at the mitochondrial level, variation at the autosomal genomes of European and Near Eastern Sus scrofa has not been compared yet. Herewith, we have explored the genetic relationships among 43 wild boar from Europe (N = 21), Near East (N = 19) and Korea (N = 3), and 40 Iberian (N = 16), Canarian (N = 4) and Mangalitza (N = 20) pigs by using a high throughput SNP genotyping platform. After data filtering, 37,167 autosomal SNPs were used to perform population genetics analyses. A multidimensional scaling plot based on genome-wide identity-by-state pairwise distances inferred with PLINK showed that Near Eastern and European wild boar populations are genetically differentiated. Maximum likelihood trees built with TreeMix supported this conclusion i.e. an early population split between Near Eastern and European Sus scrofa was observed. Moreover, analysis of the data with Structure evidenced that the sampled Iberian, Canarian and Mangalitza pigs did not carry any autosomal signature compatible with a Near Eastern ancestry, a finding that agrees well with previous mitochondrial studies. © 2013 Manunza et al.This work has been funded by grants AGL2010-22208-C02-02 (Ministerio de Ciencia e Innovación) and CSD 2007-00036 (Ministerio de Ciencia e Innovación, Consolider Ingenio 2010 Program). A. Zidi received a contractual grant under the framework of CSD 2007-00036.Peer Reviewe