La Constitución de Estados Unidos y los primeros documentos constitucionales argentinos

Fil: Colautti, Carlos Eduardo. Universidad de Buenos Aires. Facultad de Derecho. Cátedra Derecho Constitucional. Buenos Aires, ArgentinaFil: Colautti, Carlos Eduardo. Universidad de Buenos Aires. Facultad de Derecho. Instituto de Investigaciones Jurídicas y Sociales Ambrosio L. Gioja. Buenos Aires, Argentin

La Constitución de 1826 como antecedente y fuente de la Constitución Nacional

Fil: Colautti, Carlos Eduardo. Universidad de Buenos Aires. Facultad de Derecho. Cátedra Derecho Constitucional. Buenos Aires, Argentin

Biology of growth of Hoplias aff. malabaricus (Bloch, 1794) in a shallow pampean lake Argentina

The trahira Hoplias aff. malabaricus is a top predator in pampean shallow lakes and is highly appreciated by recreational anglers and artisanal fishermen. Trahira growth from Yalca shallow lake was determined by lepidological analysis and age validated by marginal increment. When growth was fitted to the von Bertalanffy model, annual classes exhibited a bimodal pattern as a result of the presence of spring and summer annual cohorts associated with a three month spawning season, each period in turn showing different growth patterns. The trahira population-age structure at Yalca shallow lake showed a truncated profile with very low numbers of large adults and few individuals older than three to four years, thus producing an unbalanced length-structure population. Growth parameters and growth performance were similar to the corresponding parameters estimated for other shallow pampean lakes of the region, but strongly diverged from the data for those populations inhabiting subtropical and tropical environments. Such differences could be accounted for by dissimilarity in metabolic rates associated with thermal differences accompanying seasonal variability among latitudes as well as by the development of adaptive physiologic and demographic responses to cope with the high thermal amplitude and hydrologic instability observed in pampean lakes.A traíra Hoplias aff. malabaricus é um predador de topo encontrado em lagoas rasas nos Pampas, muito apreciada nas pescas comerciais e esportivas. O crescimento da traíra no lago Yalca foi determinado através de análises lepidológicas, validadas a partir do incremento marginal. O crescimento foi ajustado ao modelo de von Bertalanffy, sendo que as classes de tamanho anuais apresentaram padrão bimodal devido à presença de coortes de primavera e verão, associadas à uma longa estação reprodutiva com diferentes padrões de crescimento. A estrutura etária da traíra do lago Yalca apresentou um perfil truncado, com um número pequeno de adultos de maior porte e poucos indivíduos com mais de três ou quatro anos, produzindo uma estrutura em tamanho desbalanceada. Os parâmetros e a performance de crescimento foram similares aos estimados para outros lagos rasos da região, mas fortemente divergentes de populações encontradas em ambientes tropicais e subtropicais. Tais diferenças podem estar relacionadas à diferentes taxas metabólicas associadas à variação térmica sazonal entre latitudes e ao desenvolvimento de respostas adaptativas fisiológicas e demográficas em resposta aos padrões termais altamente variáveis e instabilidade hidrológica observados nos lagos da região dos Pampas.Fil: Balboni, Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); ArgentinaFil: Colautti, Dario César. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); ArgentinaFil: Baigún, Claudio Rafael M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús). Universidad Nacional de San Martín. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas "Dr. Raúl Alfonsín" (sede Chascomús); Argentin

Avances en el desarrollo del cultivo de la mojarra (Cheirodon interruptus) como alternativa a la explotación de poblaciones silvestres

Fil: Maiztegui, Tomás. IIB-INTECH. Instituto Biotecnológico Chascomús. UNSAM; ArgentinaFil: Campanella, Daniela. IIB-INTECH. Instituto Biotecnológico Chascomús. UNSAM; ArgentinaFil: Colautti, Darío César. Instituto de Limnología Dr. Raúl A. Ringuelet (ILPLA). Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentin

The Natuzzi Group and the Bari-Matera (Italy) upholstered furniture district. A case study of internationalisation in a traditional industry

The case-study focuses on the strategies adopted by the Natuzzi Group, world leader of the upholstered furniture sector, located in the Bari-Matera district (Southern Italy), to face increasing global competition and on their effects. In particular we consider the modes and determinants of productive internationalisation, carried out since 2000 by Natuzzi in China, Brazil and Romania to produce middle-low end products. By improving the competitiveness of the price-sensitive segment, the strategy contributed to the successful expansion of the Group until 2002. However, high range products, manufactured in Italy, record decreasing sales especially on the US market, despite the companys efforts in R&D and marketing and its investments in information technology. Moreover, due to Natuzzi's considerable weight in the district, the Groups performance impacts on the network of subcontracting firms, where a restructuring process is underway, raising questions about the evolution of the district.Internationalisation, Industrial District, Subcontracting

Walsh functions: analysis of their properties under Fresnel diffraction

The free-propagation properties of the light field diffracted by an aperture, have been investigated by employing a formalism based on the orthogonal and complete set of Walsh functions. We found an interesting link with the well-known self-imaging phenomenon, which can be used to explain the spatial filtering properties of many optical devices. An experimental result is given in order to illustrate this approach

Ictiofauna de un ambiente lótico suburbano : EL arroyo Rodríguez (Buenos Aires, Argentina)

Fil: Remes Lenicov, Mauricio. Instituto de Limnología Raúl Ringuelet, La Plata, ArgentinaFil: Colautti, Darío César. Ecología y Producción Pesquera, Instituto de Investigaciones Biotecnológicas, Instituto Tecnológico de Chascomús, Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Universidad Nacional de San Martín, UNSAM, Camino Circunvalación Laguna, Km 6, CP 7130, Chascomús, Buenos Aires, ArgentinaFil: López, Hugo Luis. División Zoología Vertebrados, FCNyM, UNL

A Molecule‐Based Single‐Photon Source Applied in Quantum Radiometry

Single photon sources (SPSs) based on quantum emitters hold promise in quantum radiometry as metrology standard for photon fluxes at the low light level. Ideally this requires control over the photon flux in a wide dynamic range, sub-Poissonian photon statistics and narrow-band emission spectrum. In this work, a monochromatic single-photon source based on an organic dye molecule is presented, whose photon flux is traceably measured to be adjustable between 144 000 and 1320 000 photons per second at a wavelength of (785.6 +/- 0.1) nm, corresponding to an optical radiant flux between 36.5 fW and 334 fW. The high purity of the single-photon stream is verified, with a second-order autocorrelation function at zero time delay below 0.1 throughout the whole range. Featuring an appropriate combination of emission properties, the molecular SPS shows here application in the calibration of a silicon Single-Photon Avalanche Detector (SPAD) against a low-noise analog silicon photodiode traceable to the primary standard for optical radiant flux (i.e. the cryogenic radiometer). Due to the narrow bandwidth of the source, corrections to the SPAD detection efficiency arising from the spectral power distribution are negligible. With this major advantage, the developed device may finally realize a low-photon-flux standard source for quantum radiometry

Hábitos alimentarios de Gymnogeophagus meridionalis (Osteichthyes, Cichlidae) en un arroyo urbano

Gymnogeophagus meridionalis reis & Malabarba, 1988 es un cíclido común tanto en ambientes naturales como modificados. Este trabajo describe la dieta de esta especie en el arroyo Martín, un curso de agua urbano con moderada perturbación antrópica, ubicado en el Partido de La Plata (Buenos Aires). Se recolectaron 173 especímenes en otoño, invierno y primavera de 2014 y verano de 2015, en dos sitios con diferente uso de suelo: M1 (zona hortícola) y M2 (zona urbana). Se determinaron la composición y el volumen del contenido digestivo y el número de individuos por ítem alimentario. El Índice de Importancia relativa indicó que larvas de chironomidae y copepoda son los recursos tróficos más importantes. El test de Kolmogorov-Smirnov no detectó una diferencia significativa cualitativa entre las dietas de M1 y M2. Sin embargo, el índice de repleción relativo mostró valores muy altos en este último sitio en primavera y verano. El método gráfico de Amundsen determinó que la estrategia alimentaria es de tipo especialista en larvas de chironomidae durante la mayor parte del año, pasando a generalista en primavera. En ambos sitios de muestreo la mejor condición relativa de los peces se observó en invierno y primavera. En el arroyo Martín, G. meridionalis presenta una dieta acotada, reflejada por la baja cantidad de ítems consumidos, en comparación con la de otras especies que habitan arroyos menos impactados de la región. Es probable que esto se deba más a una oferta de alimento limitada que a una selección de presas por parte de la especie.The Martín stream is an urban water course with moderate anthropic impact located in La Plata (Buenos Aires). Gymnogeophagus meridionalis Reis & Malabarba, 1988 is a fish of Cichlids family that is common in natural environments or those modified by human. The paper objective is to characterize the G. merdionalis diet at the mentioned stream. Fish sampling was carried out in autumn, winter and spring 2014 and summer of 2015 in two areas with different land uses M1 (horticultural) and M2 (urban). A total of 173 specimens were collected and composition, volume and number per food item were determinated in the digestive contents. The alimentary importance index indicated that Chironomid larvae and Copepods are the main trophic resources. The KolmogorovSmirnov test did not detect qualitative significant differences between the fish diets from M1 and M2. However, the relative repletion index showed very high values in the latter site in spring and summer. The Amundsen method determined two types of feeding strategies one of them as a specialist type in the intake of Chironomid larvae during most of the year and another generalist in the spring. The best relative condition was observed in winter and spring in both sampling sites. The Martín stream provide to G. meridionalis a restrict diet that is reflected in low quantity of item consumed by comparison with item consumed from some fish that inhabit streams with low perturbation in this region. This is likely to be related to a limited supply of food rather than to a selection of prey by the species.Fil: Yorojo Moreno, Vivian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología ; ArgentinaFil: Garcia, Ignacio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología ; ArgentinaFil: Maroñas, Miriam Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología ; ArgentinaFil: Colautti, Dario César. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Limnología ; Argentin