Search results for "Icon"
showing 10 items of 3539 documents
Light absorption in silicon quantum dots embedded in silica
2009
The photon absorption in Si quantum dots (QDs) embedded in SiO2 has been systematically investigated by varying several parameters of the QD synthesis. Plasma-enhanced chemical vapor deposition (PECVD) or magnetron cosputtering (MS) have been used to deposit, upon quartz substrates, single layer, or multilayer structures of Si-rich- SiO2 (SRO) with different Si content (43-46 at. %). SRO samples have been annealed for 1 h in the 450-1250 °C range and characterized by optical absorption measurements, photoluminescence analysis, Rutherford backscattering spectrometry and x-ray Photoelectron Spectroscopy. After annealing up to 900 °C SRO films grown by MS show a higher absorption coefficient a…
La música de lo invisible: modelos iconográficos en el Saint François d'Assise de Olivier Messiaen
2016
Saint François d’Assise (1983) es la única ópera del compositor francés Olivier Messiaen (1908-1992). El presente artículo propone un estudio de las referencias iconográficas que sirvieron a Messiaen de modelo para la caracterización musical y escenográfica de los principales protagonistas de la ópera: San Francisco, el ángel y el leproso. A través de la observación y del análisis de los frescos, las pinturas y los grabados de Giotto, Cimabue, Fra Angélico, Maurice Denis y Mathias Grünewald, desvelamos la especial significación de los personajes que se manifiesta a través del sonido y del color como una unidad. Saint François d’Assise is the only opera written by French composer Olivier Mes…
Alcune rappresentazioni di San Eligio nella Sicilia centro-occidentale
2011
L'iconografia del Santo patrono degli orafi e degli argentieri nella produzione figurativa e scultorea della Sicilia occidentale. La storia della chiesa dedicata al Santo nella città di Palermo
Nuevas lecturas en torno al retablo mayor de San Jaime apóstol de Algemesí.
2010
Este artículo pretende realizar, a partir del estudio de los distintos tipos iconográficos que configuraron el antiguo retablo de San Jaime apóstol de Algemesí, pintado por Francisco Ribalta entre 1603 y 1610, y la tradición literaria subyacente en ellos, una aproximación a los posibles significados presentes en él, con una interpretación del discurso ideológico que presentaba las diversas imágenes narrativas y conceptuales como ejemplos de conversión, predicación y virtud como camino de perfeccionamiento de la vida cristiana. This article offers an interpretation of the possible meanings present in the ancient altar-piece or reredos of Saint James the Apostle in Algemesí [province of Valen…
I ‘dark sides’ dei sarcofagi romani
2022
Le casse dei sarcofagi romani, di tipo urbano e occidentale, sono di norma scolpite su tre lati: la fronte, che accoglie la rappresentazione principale, e i due fianchi, provvisti di raffigurazioni secondarie e di estensione più limitata. Questo studio si concentra sui fianchi, i quali hanno solitamente suscitato un interesse minore, analizzandone le caratteristiche più ricorrenti e proponendone una classificazione tipologica, sulla base del rapporto che di volta in volta potevano instaurare con le fronti.
Riso, potere e modelli letterari nella Coena Trimalchionis
2022
Il contributo mira ad esaminare i riferimenti al fenomeno della risata nel contesto della Coena Trimalchionis, narrata ai capp. 27-78 del Satyricon petroniano. Le occasioni di riso che si vengono a creare nel corso della cena presso il ricco liberto – contesto in cui il dislivello sociale e culturale tra i personaggi di scuola ed gli indocti è costantemente sottoposto all’attenzione del lettore – evidenziano infatti una forte distorsione delle dinamiche di potere in ambito conviviale. L’atteggiamento di scherno nei confronti dei liberti da parte degli scholastici, spesso costretti a trattenere l’ilarità di fronte alle trovate ed ai discorsi dalla profonda bassezza culturale di Trimalchione …
Isolation of the silicatein-α interactor silintaphin-2 by a novel solid-phase pull-down assay.
2011
The skeleton of siliceous sponges consists of amorphous biogenous silica (biosilica). Biosilica formation is driven enzymatically by means of silicatein(s). During this unique process of enzymatic polycondensation, skeletal elements (spicules) that enfold a central proteinaceous structure (axial filament), mainly comprising silicatein, are formed. However, only the concerted action of silicatein and other proteins can explain the genetically controlled diversity of spicular morphotypes, from simple rods with pointed ends to intricate structures with up to six rays. With the scaffold protein silintaphin-1, a first silicatein interactor that facilitates the formation of the axial filament and…
Biosilica-loaded poly(ϵ-caprolactone) nanofibers mats provide a morphogenetically active surface scaffold for the growth and mineralization of the os…
2014
Bioprinting/3D cell printing procedures for the preparation of scaffolds/implants have the potential to revolutionize regenerative medicine. Besides biocompatibility and biodegradability, the hardness of the scaffold material is of critical importance to allow sufficient mechanical protection and, to the same extent, allow migration, cell–cell, and cell–substrate contact formation of the matrix-embedded cells. In the present study, we present a strategy to encase a bioprinted, cell-containing, and soft scaffold with an electrospun mat. The electrospun poly(e-caprolactone) (PCL) nanofibers mats, containing tetraethyl orthosilicate (TEOS), were subsequently incubated with silicatein. Silicate…
The Deep-Sea Natural Products, Biogenic Polyphosphate (Bio-PolyP) and Biogenic Silica (Bio-Silica), as Biomimetic Scaffolds for Bone Tissue Engineeri…
2013
Bone defects in human, caused by fractures/nonunions or trauma, gain increasing impact and have become a medical challenge in the present-day aging population. Frequently, those fractures require surgical intervention which ideally relies on autografts or suboptimally on allografts. Therefore, it is pressing and likewise challenging to develop bone substitution materials to heal bone defects. During the differentiation of osteoblasts from their mesenchymal progenitor/stem cells and of osteoclasts from their hemopoietic precursor cells, a lineage-specific release of growth factors and a trans-lineage homeostatic cross-talk via signaling molecules take place. Hence, the major hurdle is to fab…
4-(3H)-quinazolinones N-3 substituted with a five membered heterocycle: A promising scaffold towards bioactive molecules
2020
Abstract The quinazolinone nucleus represents, among the class of fused heterocycles, a very important scaffold to obtain molecules with biological activities. A review of literature revealed how such kind of fused heterocycles, coming from natural or synthetic source, are associated with a wide range of biological activities. This review is mainly directed towards the 4-(3H)-quinazolinones N-3 substituted with a five membered heterocycle in which all the possible combinations of nitrogen, sulfur and oxygen atoms are present.