994 resultados para Alsina, Adolfo, 1829-1877.


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Wood mice of the genus Apodemus are widely distributed in Eurasia, with the Eastern Mediterranean being considered as a hotspot. Indeed, numerous species have been documented in Iran, including A. witherbyi, A. hyrcanicus, A. uralensis, A. avicennicus, A. hermonensis, and A. arianus. In this study, 129 specimens were collected from different Iranian localities and two specimens from Afghanistan. The animals were identified taxonomically and their phylogenetic relationships were investigated using cytochrome b mitochondrial DNA sequences. Five species of the genus Apodemus were identified in Iran, including A. hyrcanicus, A. witherbyi, A. cf. ponticus, A. uralensis, and A. mystacinus, beside, A. pallipes from Afghanistan. This study found no evidence of A. flavicollis or A. sylvaticus in Iran, despite their occurrence in Turkey, shedding doubt on the status of A. flavicollis in Iran, Asia Minor, and the Levant. Phylogenetic analyses imply that A. witherbyi has priority over A. avicennicus, A. hermonensis, and A. iconicus. Estimation of the divergence time for these taxa suggests a separation at around 7.2 Ma for the subgenera Karstomys (including A. mystacinus and A. epimelas) and Sylvaemus (including A. flavicollis, A. sylvaticus, A. uralensis, A. pallipes, A. hyrcanicus, A. witherbyi, and A. cf. ponticus). Within the subgenus Karstomys, the divergence times for A. mystacinus and A. epimelas were between 3.0 and 6.1 Ma, and divergence times within the subgenus Sylvaemus were between 5.2 and 6.9 Ma for A. witherbyi and other species in this subgenus. It is postulated that vicariance events including the uplifting of the Zagros Mountains and Anatolian Plateau in the middle Miocene and climate oscillations during the Messinian Salinity Crisis besides formation of the Hyrcanian tertiary forests during the Neogene probably played substantial roles in the radiation and distribution of the genus Apodemus in the Eastern Mediterranean.

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Sobre el projecte de recerca “Comportament dels nusos rígids d’estructures de formigó armat executades amb formigons de diferenta qualitat” per part del Cecam, Universitat de Girona i Formigons Alsina, i amb la col.laboració de Sika i Prefer, i amb el suport institucional d’Arquitectura i Habitatge de la Generalitat de Catalunya

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Una de las publicaciones catalanas más desconocidas ha sido la Revista Comercial Ibero-Americana Mercurio de Barcelona, fundada en la ciudad condal en diciembre de 1901, y gestora del impulso americanista catalán hasta la actualidad. En su seno se conformó un importante grupo de americanistas catalanes que el 11 de abril de 1911 inauguraron la Casa de América de Barcelona. Esta entidad catalana tuvo un gran desarrollo hasta la Guerra Civil española. En todos esos años se dedicó a generar e impulsar diversos proyectos internacionales vinculados estrechamente a los países latinoamericanos. Pero es importante señalar que dicha entidad fue un interesante desprendimiento de la original Revista Comercial Ibero-Americana Mercurio de Barcelona, la cual llegó a su fin en el año 1938, en plena Guerra Civil española, y en virtud del exilio que hicieron sus miembros más importantes a la República Argentina: Francesc Cambó Batlle, Rafael Vehils Grau-Bolívar y Andrés Bausili. Precisamente en esos años también visitó la República Argentina el intelectual Adolfo Posada (en origen llamado Adolfo González Posada), quien en el año 1912 dio a conocer en España su importante libro titulado La República Argentina, y que él elaboró durante la primera visita que hizo al país dos años antes, en 1910. En sus estudios sobre Argentina, sumó los informes que presentó a la revista Mercurio de Barcelona entre 1904 y 1925, momento en que hizo referencia al 'Paseo por la ciudad de Rosario' analizado en este artículo.

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Samples of copper compounds covering all of the XXth century and the end of the XIXth century were submitted to classical and instrumental quantitative analysis. The amount of impurities greatly decreased with time, reaching a constant level since the 1960's. The gravimetric method was suitable for the determination of copper although other procedures also gave good or reasonable results. However, for metal contaminants, atomic absorption spectrometry was the best choice because of its lower detection limits, being able to determine several elements in the oldest samples. Ion chromatography detected several anions in copper salts manufactured before the 1950's. An increasing quality of raw materials and a better sensitivity of analytical methods led to quality improvement of copper compounds with time.

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Variante(s) de titre : Le Cultivateur, journal des progrès agricoles

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AbstractIn the beginning of the 19th century, Portugal received from Brazil several barks that were used as cure for fevers for the purpose of chemical analysis. These analyses were intended to determine the principle compositional components responsible for the febrifuge power of these barks. At the University of Coimbra, the samples were analyzed under the supervision of Thomé Rodrigues Sobral, the Director of the university's Chemical Laboratory. In the interpretation of the obtained results, Sobral put forward his own ideas about the febrifuge principles of the analyzed barks in relation to their chemical composition. Here, we refer to both Rodrigues Sobral's reported results and his ideas about the febrifuge principle.

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Este trabalho teve como objetivo verificar a autenticidade de bebidas alcoólicas (whisky, vodka, conhaque de gengibre, etc.) enviadas para análise ao Instituto Adolfo Lutz no período de 1993 a agosto de 1999. Devido à presença no mercado nacional de bebidas alcoólicas clandestinas, principalmente aquelas com alto valor agregado, foi realizado o monitoramento através da análise de composição química destas bebidas. Normalmente estes produtos são elaborados com álcool, água, aroma e corante caramelo e que por falta de controle dessas matérias-primas, podem oferecer risco potencial à saúde humana pela presença de metanol. A técnica empregada na análise dos componentes secundários e metanol das amostras foi realizada através da cromatografia em fase gasosa com detector de ionização de chama. Observou-se que em 608 amostras de bebidas alcoólicas analisadas, 391 eram falsificadas e dentre estas 2 apresentaram teores de metanol acima do limite tolerado (200mg/100mL de álcool anidro) pela legislação em vigor. Os resultados obtidos sugerem uma grande persistência em se produzir bebidas alcoólicas falsificadas. Desta forma, é muito importante estar sempre monitorando estes produtos e identificando os diferentes tipos de falsificações existentes no país.