Model study of the constituents of wall painting degradation patinas: The effect of the treatment with chelating agents on the solubility of the calcium salts

A model study on the application of chelating solutions on superficial calcium degradation patinas of wall paintings is presented. For this purpose the solubility of calcium sulfate, carbonate and oxalate in aqueous solutions of the Ca2 + chelators EDTA and citrate, was evaluated. Both the obtained solutions and their insoluble materials were analyzed by several analytical techniques. These studies revealed that the treatment of solid samples containing calcium sulfate and carbonate as the models of painting patinas resulted in higher solubilities of calcium sulfate and carbonate over that of oxalate. Moreover, our investigations confirmed the higher capacity of EDTA to chelate Ca2 + compared to that of citrate. All these results were interpreted and discussed on the basis of speciation models, solubility products of the salts and formation constants of the calcium complexes in solution. Finally, we report the characterization of a sodium calcium double citrate salt formed as an unexpected product in the treatment of the calcium sulfate with citrate. Overall our results suggest that the low solubility of calcium oxalate prevents its dissolution upon treatments with chelators, and that the capacity of citrate to dissolve the calcium salts is lower than that of EDTA irrespective of the duration of treatment

Evaluación del impacto económico de la implementación de la soja transgénica en Paraguay 1994-2014

El objetivo de la presente investigación ha consistido en analizar el impacto económico de la aprobación de la soja transgénica (RR) en el Paraguay en el período 1982-2012, cuyos resultados se exponen en el presente tríptico.CONACYT - Consejo Nacional de Ciencia y TecnologíaPROCIENCI

Impacto económico de la implementación de la soja transgénica en el Paraguay 1994 - 2014

La agricultura latinoamericana ha ido evolucionando constantemente. Los avances en investigación y desarrollo en materia biotecnología permitieron incorporar esta tecnología en la agricultura paraguaya. El cultivo de la soja transgénica ha dinamizado la economía paraguaya, al estar entrelazado a otros sectores económicos. En este trabajo se utilizó una metodología analítico-descriptiva con dos enfoques: cuantitativo y cualitativo para determinar la magnitud de su impacto en la economía. Para el primero de ellos, se recurrió a la estimación de una Matriz Insumo Producto y de un modelo econométrico. En el aspecto cualitativo, se efectuaron entrevistas a referentes, tomadores de decisión y productores del sector sojero, como base para la construcción del mapeo de actores del sector. El estudio concluye que la adopción de la soja transgénica a partir del año 2004 ha sido un factor clave en la producción de soja y que contribuyó positivamente en el crecimiento económico del país.CONACYT - Consejo Nacional de Ciencia y TecnologíaPROCIENCI

Evaluación del impacto económico de la implementación de la soja transgénica en Paraguay 1982-2012

Esta investigación busca integrar dos enfoques en materia económica, el de la matriz insumo-producto y el econométrico, de manera que los resultados puedan ser útiles en el planteamiento de las políticas públicas no solo en el rubro agrícola analizado, sino también en el resto del sistema productivo nacional, bajo determinados supuestos.CONACYT – Consejo Nacional de Ciencia y TecnologíaPROCIENCI

Overview of DISCOVER22 experiment in the framework of INFN-LNGS Cosmic Silence activity: challenges and improvements in underground radiobiology

One of the most intriguing and still pending questions in radiobiology is to understand whether and how natural environmental background radiation has shaped Life over millions of years of evolution on Earth. Deep Underground Laboratories (DULs) represent the ideal below-background exposure facilities where to address such a question. Among the few worldwide DULs, INFN-Laboratorio Nazionale del Gran Sasso (LNGS) is one of the largest in terms of size and infrastructure. Designed and built to host neutrino and dark matter experiments, since the 1990 s the LNGS has been one of the first DULs to systematically host radiobiology experiments. Here we present the DISCOVER22 (DNA Damage and Immune System Cooperation in VEry low Radiation environment 2022) experiment recently started at LNGS. DISCOVER22 aims at investigating how the low radiation background modulates the Immune System (IS) response in in vitro and in vivo models. Underground radiobiology experiments are particularly complex and tricky to design and perform. In these studies, the accurate characterization of exposure scenarios is mandatory, but a challenging aspect is to understand how the very few ionizing tracks in the ultra-Low Radiation Environment (LRE) interact with the living matter in space and time in order to trigger different biological responses. In this Perspective, we describe these challenges and how we address them through a microdosimetric and a radiobiological approaches. We aim at linking physical microdosimetric measurements and the corresponding biological radiation responses by using radiation biophysical models that could shed light on many as yet unresolved questions

The EU Center of Excellence for Exascale in Solid Earth (ChEESE): Implementation, results, and roadmap for the second phase

publishedVersio

Il metodo Dry Cleaning per la pulitura delle opere d’arte: il caso studio delle mensole lignee policrome del castello di Trabia

Le superfici policrome non verniciate pongono delle specifiche pro - blematiche di conservazione, legate soprattutto alla spiccata sensibilità. Agli agenti esterni (temperatura, pul - viscolo atmosferico, umidità, etc.). Anche le operazioni di pulitura di tali opere si scontrano con delle problematiche particolari, legate a difficoltà di intervento utilizzando le metodiche tradizionali1. A tali quesiti è da aggiungere, per di più, che le pellicole pittoriche realizzate senza uno strato protettivo necessitano, con maggiore frequenza, di interventi conservativi

La Pulitura a Secco di due opere murali contemporanee: Moani Haghighi “Senza Titolo” ed Emilio Tadini “Città”

Le opere Senza titolo, di Moani Haghighi, 1996 e Città, di Emilio Tadini, 1995, fanno parte della collezione del MAPP, il museo d’arte contemporanea nato nel 1995 quale progetto di recupero dell’area dell’ex Ospedale Psichiatrico Paolo Pini di Milano.A supporto dei restauri è stato previsto il coinvolgimento di istituti di ricerca universitari per lo studio della natura dei componenti, del loro degrado e per l'analisi degli strumenti di pulitura: il Dipartimento di Chimica IFM dell'Università degli Studi di Torino ed il Dipartimento di Chimica Università degli Studi di Parma