Figure nascoste. L'arte di Giuseppe Ferrari

Catalogo della mostra monografica dedicata all'artista, tra gli esponenti pi\uf9 originali della pittura informale italiana della seconda met\ue0 del Novecento

La musica di Babele. L'arte di Pirro Cuniberti.

Il saggio ripercorre la carriera di uno dei maestri italiani pi\uf9 rappresentativi del secondo Novecento, la cui arte, che spazia dalla pittura alla grafica, alla comunicazione pubblicitaria e al design, si colloca nella dimensione poetica alla quale appartengono creatori del calibro di Paul Klee e Marc Chagall, disegnatori e coloristi straordinari, la cui opera attinge a un immaginario sospeso tra la realt\ue0 e la fantasticheria

Educare artisti o formare artigiani? Dal dibattito tra le arti alla nascita del Design

Il saggio ripercorre il processo di evoluzione del concetto di arti applicate in et\ue0 contemporanea, dal dibattito sulle arti maggiori e minori, variamente affrontato nei diversi paesi europei nel corso dell'Ottocento, alla definizione dell'ambito oggi definito del design. L'indagine evidenzia, inoltre, la formazione conseguente al lungo processo di elaborazione di nuove identit\ue0 professionali, capaci di superare la secolare distinzione tra artista e artigiano e sollecitare il sorgere di inediti e pi\uf9 corretti parametri di valutazione delle opere

Linee di fuga e parallele.

Ricostruzione del percorso, parallelo e sintonico per un breve tratto, poi divergente, di Arturo Marini, scultore, e Gino Rossi, pittore. Da Venezia, negli anni d'oro di Ca' Pesaro, a Parigi; dal successo all'incomprensione, dalle polemiche accese all'afasia della malattia mentale

Conformations Of A Model Protein Revealed By An Aggregating Cuᴵᴵ Porphyrin: Sensing The Difference

Aggregated t-CuP binds to poly-L-glutamate through supramolecular interactions, revealing itself to be an extremely sensitive probe for the major conformations of the polymeric scaffold

Effect Of Zinc Cations On The Kinetics Of Supramolecular Assembly And The Chirality Of Porphyrin J-Aggregates

Dilute aqueous solutions of anionic meso-4-sulfonatophenyl-porphyrin (TPPS) extract zinc(ii) ions from glass or quartz surfaces at room temperature and efficiently form the corresponding metal complex (ZnTPPS). The partial or complete formation of ZnTPPS has been probed by UV/Vis spectroscopy and both static and time-resolved fluorescence. The source of zinc(ii) ions has been clearly identified through inductively coupled plasma optical emission spectrometry. The presence of increasing amounts of ZnTPPS slows down the rate of TPPS J-aggregate formation in acid solution. This influences the nucleation step and has a profound impact on the onset of chirality in these species. This evidence indicates the important role of this adventitious metal ion in the interpretation of various spectroscopic and kinetic data for the self-assembly of the TPPS porphyrin and provides some insights into controversial findings on their chirality. The use of this metal derivative as the starting compound for in situ formation of monomeric TPPS is suggested

Poesia in posa

Catalogo della mostra, a cura di C. Gian Ferrari, M. Scolaro, C. Spadoni. Rilettura dell'opera di Felice Casorati con particolare attenzione al contesto di riferimento culturale e alle fonti, all'ambiente torinese che rappresent\uf2 il primo destinatario della sua opera. Analisi approfondite dei rapporti con gli intellettuali piemontesi, con Piero Gobetti, primo esegeta dell'arte di Casorati, e con i coniugi Gualino, importanti figure di committenti/mecenati

Notes pour une mise au point:Peintres et photographes italiens de la deuxi\ue8me moiti\ue9 du XIXesi\ue8cle

Catalogo della mostra, Collezioni d'arte e fotografia artistica nell'Italia del Risorgimento, Roma, Museo del Vittoriano-Grenoble, Istituto italiano di cultura. Lo scritto rievoca l'ambivalenza del rapporto tra gli artisti, i pittori, in particolare, e la fotografia nella seconda met\ue0 dell'Ottocento, incerti se accoglierla come un alleato, un utile strumento per la creazione, o un pericoloso rivale

Some models of ecogeographic speciation explaining the herpetological diversity of the Andean-Patagonian region

Se analizan cuatro modelos de especiación geográfica en el área andino-patagónica. Un primer y simple modelo involucra las mesetas basálticas aisladas a través del territorio extra-andino, las que han soportado desde el Terciario Tardío prolongados períodos de diastrofismo climático y geológico. Su biota exhibe altas tasas de formas endémicas pertenecientes a hábitats muy restringidos, significativos para cada meseta. Dichos ecosistemas aislados llegan a constituir verdaderos refugios o "centros de neo-dispersión", con peculiares biocenosis caracterizadas por especies de iguánidos (Liolaemus, Phymaturus) y anuros (Atelognathus). Un particular patrón de distribución propio de Liolaemus darwinii, con una extendida población central a la cual periféricamente se oponen poblaciones de varias especies filéticamente relacionadas, podría adecuarse al modelo conocido como "especiación centrífuga". Este sugiere un probable proceso inicial de especiación a través de una progresión "centrífuga" que involucra fases de contracción opuestas a fases de expansión de las poblaciones: lo que estaría de acuerdo con una previsible acumulación de diferencias genéticas entre algunas poblaciones periféricas aisladas y el amplio centro poblacional radiante de distribución ancestral. El modelo del "médano invasor" puede aplicarse a los rangos de distribución de varias especies de lagartijas arenícolas pertenecientes al grupo Liolaemus wiegmannii. A partir de una antigua área de origen post-glacial, una barrera ecológica natural de dunas y médanos voladores podría haber favorecido cambios morfológicos y hasta una evolución independiente con un aislamiento geográfico de poblaciones de estas especies arenícolas relacionadas filéticamente. El modelo de "refugio en desaparición" como mecanismo para la especiación eco-geográfica puede asimismo explicar la actual distribución de las especies de lagartos del género Pristidactylus. Desde un primitivo ancestro común habitando extensos bosques, que han estado continuamente en deterioro a través del tiempo, algunas poblaciones disyuntas quedaron en refugios aislados. Subsecuentemente, ellas pudieron adquirir varias pre-adaptaciones a ambientes más abiertos, rocosos, secos y con formaciones arbustivas, evolucionando hacia los presentes taxa, diferenciados para distintos habitats.Four populational models of geographic speciation are discussed. A first tentative model points out several basaltic tablelands along the extra-Andean territory, standing lengthy periods of geological and climatic diastrophisms from the late Tertiary. A very high rate of endemic forms can be emphasised for such biota, inhabiting very restrictive ecosystems along each plateau. These isolated formations constitute reliable refuges or neo-dispersal centres, of peculiar biocenoses such in the case of lizards (Liolaemus, Phymaturus) and anurans (Atelognathus). On the other hand, the distribution pattern showed by the widespread central populations of Liolaemus darwinii and the several peripherally opposite but phyletically related species could be supported by the so-called "centrifugal speciation" model. It suggests a probable speciation process following a centrifugal progression, which involves opposite phases of contraction and expansion of the populations. That could be in agreement with an expected accumulation of genetic differences between some isolated peripheral remnants and the wide radiating centre of ancestral populations. The "invading dune" model can be applied to the distribution ranges of several sand-dwelling species of lizards belonging to "Liolaemus wiegmannii group". From ancient postglacial precursors, an interposed ecological barrier of aeolean dunes and sandbanks could have favoured morphological changes that independently characterised the population evolution and the geographic isolation of these phyletically related sand-lizard species. The "vanishing refuge" model as a mechanism for ecogeographic speciation may explain the actual distribution of lizards of the Pristidactylus genus. From a primitive common ancestor inhabiting large forest, continuously deteriorated, over time some disjoined populations remained in isolated refuges. Subsequently they could have acquired several preadaptations to environments of more open, dry, rocky and shrubby formations, evolving towards the differentiated taxa actually recognised.Fil: Scolaro, Jose Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Videla, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Cei, José M.. Universidad Nacional de Río Cuarto; Argentin

Mechanism For Copper(II)-Mediated Disaggregation Of A Porphyrin J-Aggregate

J-aggregates of anionic meso-tetrakis(4-sulfonatophenyl)porphyrin form at intermediate pH (2.3–3.1) in the presence of NiSO₄ or ZnSO₄ (ionic strength, I.S. = 3.2 M). These aggregates convert to monomeric porphyrin units via metallation with copper(II) ions. The kinetics for the disassembly process, as monitored by UV/vis spectroscopy, exhibits zeroth-order behavior. The observed zeroth-order rate constants show a two-term dependence on copper(II) ion concentrations: linear and second order. Also observed is an inverse dependence on hydrogen ion concentration. Activation parameters have been determined for the disassembly process leading to ΔH^≠ = (+163 ± 15) kJ·mol⁻¹ and ΔS^≠ = (+136 ± 11) J·K⁻¹. A mechanism is proposed in which copper(II) cation is in pre-equilibrium with a reactive site at the rim of the J-aggregate. An intermediate copper species is thus formed that eventually leads to the final metallated porphyrin either through an assisted attack of a second metal ion or through a direct insertion of the metal cation into the macrocycle core