Search results for "flores"
showing 10 items of 85 documents
Corrosion of Heritage Objects: Collagen‐Like Triple Helix Found in the Calcium Acetate Hemihydrate Crystal Structure
2020
Abstract Helical motifs are common in nature, for example, the DNA double or the collagen triple helix. In the latter proteins, the helical motif originates from glycine, the smallest amino acid, whose molecular confirmation is closely related to acetic acid. The combination of acetic acid with calcium and water, which are also omnipresent in nature, materializing as calcium acetate hemihydrate, was now revealed to exhibit a collagen‐like triple helix structure. This calcium salt is observed as efflorescence phase on calcareous heritage objects, like historic Mollusca shells, pottery or marble reliefs. In a model experiment pure calcium acetate hemihydrate was crystallized on the surface of…
Biodiversity within the subfamily Alyssinae (Hymenoptera, Braconidae) in the Natural Park Peñas de Aya (Spain)
2011
Biodiversity within the subfamily Alyssinae (Hymenoptera, Braconidae) in the Natural Park Peñas de Aya (Spain). The study of parasitoid Hymenoptera is of significance for the assessment of diversity in a given area because of their role in the regulation of insects populations. The present work analyses diversity within Alysiinae (Hymenoptera, Braconidae) in the Forested Estate of Artikutza, located in the Natural Park Peñas de Aya, western Pyrenees, Spain. Collection of specimens was spread over two years and was carried out in two different habitats: mixed forest and beech forest. A total of 2,270 specimens, belonging to 22 separate genera, were captured. Subsequently, alpha, beta and gam…
Bilabiate Flowers: The Ultimate Response to Bees?
2007
† Background and Aims Bilabiate flowers have evolved in many lineages of the angiosperms, thus representing a convincing example of parallel evolution. Similar to keel blossoms, they have obviously evolved in order to protect pollen against pollen-collecting bees. Although many examples are known, a comprehensive survey on floral diversity and functional constraints of bilabiate flowers is lacking. Here, the concept is widened and described as a general pattern. † Methods The present paper is a conceptional review including personal observations of the authors. To form a survey on the diversity of bilabiate blossoms, a search was made for examples across the angiosperms and these were combi…
Eduardo Flores Clair, Minería, educación y sociedad. El Colegio de Minería, 1774-1821 [Reseña]
2001
Reseña sobre Eduardo Flores Clair, Minería, educación y sociedad. El Colegio de Minería, 1774-1821, México, Instituto Nacional de Antropología e Historia, 2000.
Study and dating of medieval ceramic tiles by analysis of enamels with atomic absorption spectroscopy, X-ray fluorescence and electron probe microana…
2002
Abstract This paper reports an analytical study of enamel on fragments of medieval tiles using atomic spectroscopy techniques — AAS, XRF and SEM/EDX. The samples came from a hermitage in the region of Valencia (Spain) and have different motifs, mainly floral ones in a wide variety of colors. A study of the soluble salts in the biscuits and mortar was carried out using AAS to determine their present capacity to produce efflorescence and the type of efflorescence. XRF was used to identify the oxides responsible for the different colors and the pigments used over large areas of the tiles (white and green). SEM/EDX was used to characterize the white and green and smaller areas of other colors. …
Emblemática mariana. Flores de Miraflores de Fray Nicolás de la Iglesia
2009
Fray Nicolás de la Iglesia, prior de la Cartuja de Burgos, mandó decorar una capilla dedicada a la Virgen con emblemas marianos. Poco después, entre 1653-54, los insertó —añadiendo otros nuevos, hasta un total de cincuenta y uno— en un libro dedicado exclusivamente a la Inmaculada titulado: Flores de Miraflores, hieroglificos sagrados, verdades figuradas, sombras verdaderas del Mysterio de la Inmaculada Concepción de la Virgen y Madre de Dios María Señora nuestra. Se da así la circunstancia de que un conjunto pictórico origina una obra escrita. En este artículo se analizan los jeroglíficos creados por fray Nicolás explicando sus fuentes y significado. Friar Nicolás de la Iglesia, prior of t…
Maestros de Capilla de la catedral de Orihuela : de la grandeza a la decadencia
2011
Scienza e Arti Perdute: i Segreti degli Antichi Maestri Liutai
2011
Lo scopo di questo lavoro è illustrare agli insegnanti la connessione tra due settori di attività apparentemente lontani: la scelta dei materiali utilizzati nella liuteria artigianale e la chimica. Il ruolo, la composizione e la classificazione delle principali vernici per liuteria sono qui descritte assieme ad una breve sintesi dello stato dell’arte. Nel lavoro, vengono presentati i principali concetti di una tecnica analitica non distruttiva abbastanza semplice (la spettroscopia di fluorescenza da raggi X) ma, probabilmente, non abbastanza nota ai non addetti ai lavori. Un caso di studio a essa correlato è inoltre presentato per evidenziare uno dei possibili contributi del chimico nello s…
Los almanaques de Eugène Grasset (1886-1913). Una aproximación al lenguaje de flores
2019
El presente estudio analiza el trabajo realizado por el artista franco-suizo Eugène Grasset desde mediados del siglo XIX hasta principios del siglo XX. La primera cuestión es recuperar sus principales aportaciones en cuanto a su producción artística, así como los métodos de composición ornamental y decorativa. A partir de sus escritos: La Plante et ses Applications Ornementales (1896-1897), Méthode de Composition Ornementale (1905) y Composition Végétale (1911-1912), se analiza el tratamiento que le da a las plantas y a la naturaleza dentro de su dilatada producción. De hecho, creó un claro precedente en el Art Nouveau en Francia. La segunda cuestión se dedica a la identificación floral, to…
The unique pseudanthium of Actinodium (Myrtaceae) - morphological reinvestigation and possible regulation by CYCLOIDEA-like genes
2013
Background Genes encoding TCP transcription factors, such as CYCLOIDEA-like (CYC-like) genes, are well known actors in the control of plant morphological development, particularly regarding the control of floral symmetry. Despite recent understanding that these genes play a role in establishing the architecture of inflorescences in the sunflower family (Asteraceae), where hundreds of finely organized flowers are arranged to mimic an individual flower, little is known about their function in the development of flower-like inflorescences across diverse phylogenetic groups. Here, we studied the head-like pseudanthium of the Australian swamp daisy Actinodium cunninghamii Schau. (Myrtaceae, the …