Sindicador de canales de noticias

La etnomusicologías y las condiciones posibilidad del conocimiento

CONICET Digital -

La etnomusicologías y las condiciones posibilidad del conocimiento Garcia, Miguel Angel La generación y difusión del conocimiento etnomusicológico pueden ser repensadas mediante el concepto de sustentabilidad. Este concepto posee un creciente carácter polisémico que lo coloca al borde de un vacío de significado y su presencia en los proyectos de promoción musical parece haberse convertido en un imperativo para garantizar su aprobación y éxito. A pesar de estos problemas, resulta útil para reflexionar sobre la necesidad de generar un saber etnomusicológico vital, viable, cohesionado y dialógico. Asimismo, permite retratar a la etnomusicología como un locus compuesto por zonas que presentan diferentes niveles de criticismo, de autoreflexividad y de diálogo con otras disciplinas.; The generation and dissemination of knowledge can be re-thought through the concept of “sustainability”. This concept has a growing polysemic character which is pushing it to the edge of a meaning vacuum, and its presence in projects dealing with music promotion seems to have become an imperative to guaranteeing their approval and success. In spite of these problems, this concept is useful to reflect on the necessity of creating a vital, viable, cohesive and dialogic ethnomusicological knowledge. Additionally, this concept allows us to portray ethnomusicology.

El legado

CONICET Digital -

El legado Lettieri, Alberto Rodolfo A cuarenta años de su asunción, la lealtad de Héctor Cámpora, su apuesta a favor de la renovación política y el protagonismo de la juventud, y su compromiso con la integración iberoamericana y el mandato popular constituyen verdaderos estandartes del proceso de construcción del una sociedad justa, libre y soberana, convirtiéndose en guía y en símbolo para la militancia contemporánea.

Recubrimiento de Avobenzona con Eudragit

CONICET Digital -

Recubrimiento de Avobenzona con Eudragit Asero, Marta Delia; Noya, Iván; Han, Yong Ki; Segall, Adriana Ines Los protectores solares deben dar amplia cobertura para proteger la epidermis de la radiación. Según la OMS la radiación ultravioleta (RUV) ejerce factores de riesgo asociando nueve enfermedades por exposición excesiva y otras tres por baja exposición. Las poblaciones de mayores riesgos se presentan en los niños y adolescentes. Los protectores solares deben ejercer una acción de absorber, reflejar o dispersar la radiación, según la definición de la Resolución MCS 08/11 armonizada en Argentina con la Disp. 0957/2012. La Avobenzona presenta la particularidad de absorber la radiación en el rango de UV-A (320-400 nm), con un máximo de absorción a 360 nm. Debido a su fotoinestabilidad, es que debe protegerse a fin de evitar su degradación. El objetivo del presente trabajo es recubrir a la Avobenzona con excipientes habitualmente utilizados con ese fin en la Industria Farmacéutica. Para ello, se utilizó Eudragit E PO y Eudragit S 100.

Prevalencia de consumo de tabaco y variables psicosociales en profesionales psicólogos de Argentina

CONICET Digital -

Prevalencia de consumo de tabaco y variables psicosociales en profesionales psicólogos de Argentina; Prevalence of tobacco consumption and psychosocial variables in psychologists at Argentina Samaniego, Virginia Corina; Vázquez, Natalia; Bonzo, Claudia; Rodríguez de Behrends, Marisa; García, Alicia Uno de los factores que influencia el consumo de tabaco en la población general es el de consumo en los profesionales de la salud. Ese consumo se ha estudiado fundamentalmente en médicos. Se determinó la prevalencia de consumo de tabaco y otras variables psicosociales en profesionales psicólogos empleando un diseño observacional transversal. Se indagó: consumo de tabaco, estadios de cambio, tentación, nivel de adicción, aceptabilidad social. El cuestionario fue administrado a una muestra intencional de 1204 psicólogos. Los resultados arrojan una prevalencia del 34,1%, un 57,5% de la muestra se encuentra en el estadio de pre-contemplación. La prevalencia de consumo de tabaco en psicólogos resulta mayor que en población general y existe una alta resistencia para dejar de fumar.; One of the main factors that affects population trend of smoking is the consumption level among health professionals. That consumption has been studied mainly among physicians. This study aims to determine the prevalence of tobacco use and other psychosocial variables among psychologists through an observational cross-sectional study. Features inquired were: tobacco consumption; stages of change, temptation, degree of addiction, social acceptability. The final sample was 1204 psychologists. The study yielded a prevalence of smoking of 34,1%. The percentage of psychologists in the precontemplation stage was 57,5%. The prevalence of smoking in psychologists is higher than in the general population and there is a high quitting resistance in this population.

Alumnos de primer año que estudian computación: ¿qué aprenden? ¿hacia dónde se dirige el aprendizaje?

CONICET Digital -

Alumnos de primer año que estudian computación: ¿qué aprenden? ¿hacia dónde se dirige el aprendizaje?; First year computer science students: what do they learn? where is the learning oriented to? Losano, Ana Leticia; Villarreal, Monica Ester Este trabajo está enmarcado en una investigación en curso cuyo objetivo es analizar y describir los procesos de aprendizaje que se producen en el ingreso a la Licenciatura en Ciencias de la Computación de la FaMAF (UNC). Concibiendo el aprendizaje como un proceso situado social, cultural e históricamente, comunicamos aquí las respuestas a interrogantes que surgieron en el proceso de análisis de los datos: ¿qué se aprende en el primer año de la carrera? ¿hacia dónde se dirige este aprendizaje?; This paper is part of an ongoing research which intends to analyze and describe the learning processes involved in the entrance to the computer science degree program at the Faculty of Mathematics, Astronomy and Physics of the Córdoba National University. The research conceives learning as a social, cultural, and historical situated process. In this article we communicate the answers to two questions that arose during the analysis of the data: What is learned during the first year at the degree program? Where is such learning oriented to?

Escala de Autoestima Forma 5 (AF5): Indagación sobre sus Propiedades Psicométricas en Población Infantil de Córdoba/Argentina

CONICET Digital -

Escala de Autoestima Forma 5 (AF5): Indagación sobre sus Propiedades Psicométricas en Población Infantil de Córdoba/Argentina Marasca, Roxana; Marasca, Micaela; Imhoff, Débora Soledad El trabajo analiza algunas propiedades psicométricas de la Escala de Autoestima Forma 5 (AF5) de García y Musitu (1999) en población infantil. Se trabajó con 178 niños de la ciudad de Córdoba (Argentina) de 9 a 11 años seleccionados a partir de un muestreo no aleatorio accidental (Grasso, 1999). Los cuestionarios se aplicaron individualmente, previo consentimiento informado de padres y autoridades de las escuelas. Los resultados corroboran la estructura multidimensional del modelo original. Así, el modelo teórico de referencia consta de 5 factores que explican el 54% de la varianza, con alphas por sub-dimensión entre ?=.85 y ?=.61, y un índice de confiabilidad satisfactorio (?=.72) para la escala global. No se encontraron relaciones estadísticamente significativas entre las distintas dimensiones del autoestima y la escala global con la edad y sexo de los participantes. En función de los resultados, se discute la utilidad de este instrumento en el medio local.; This research examines some psychometric properties of the AF5 Multidimensional Self-Esteem scale (García & Musitu, 1999) in children´s population. This study was carried out with 178 Argentinean children, from 9 to 11 years old, who live in Cordoba city. The sample was selected using a non-random accidental sampling (Grasso, 1999). The questionnaires were applied to each child individually and with a previous parents´ and head teachers’ consent. The results confirm the multidimensional structure supported by the authors. The obtained reference model consists of 5 factors that explain 54% of the variance, with alphas per sub-dimension between ?=.85 and ?=.61, and satisfactory reliability (?=.72) for the global scale. On the other hand, the results reported statistically nonsignificant relationships between self-esteem´s dimensions and the global scale with the age and sex of participants. According to the results, the utility of this instrument in our context is discussed.

Delitos acumulativos ambientales: una aproximación desde el republicanismo

CONICET Digital -

Delitos acumulativos ambientales: una aproximación desde el republicanismo Truccone Borgogno, Santiago Damián La censura penal en los estados liberales de derecho, se ha justificado históricamente desde el concepto de bien jurídico y desde principio del daño, conforme la tradición sea alemana o anglosajona, respectivamente. Sin embargo, en las últimas décadas se observa que tales criterios no pueden hacer frente a nuevos problemas que presentan las sociedades modernas. Tal es el caso de las tipificaciones en forma de delitos acumulativos, es decir conductas que en sí mismas acarrean consecuencias lesivas muy pequeñas, pero que sumadas a otras de igual naturaleza pueden producir graves afectaciones. La literatura ha proporcionado un profuso debate sobre este tema. Aquí se intentará proponer una construcción plausible que sea capaz de justificar esta clase de prohibiciones. Para ello se parte del modelo republicano, que adopta como ideal de libertad, la no dominación. Toda vez que al ser posible la inexistencia de interferencias pero que, sin embargo, una persona vea restringida su libertad por encontrarse bajo el poder de otro (dominio), la idea de “libertad como no dominación” parece más satisfactoria para garantizar buenas condiciones de vida a los sujetos. Se ensayarán dos respuestas, una que considera que la razón de la prohibición se encuentra en el efecto que cada acto produce junto a los demás; y otra, que sólo repara en las consecuencias del acto individual.; Criminal censorship under the liberal rule of law has historically been justified under the concept of legally protected asset and the harm principle, as per the German and Anglo-Saxon traditions, respectively. However, over the last decades, such criteria have failed to overcome the new problems that arise in modern societies. Such is the case with legal classifications of cumulative offenses, i.e. behaviors that cause very limited harm on their own, but which cause serious harm when occurring in conjunction with other similar behaviors. Existing literature has resulted in a lavish debate of this issue. Here, we shall attempt to propose a plausible foundation for justifying these types of prohibitions. To that effect, we shall part from the republican model, which adopts the ideal of liberty and non-domination. Whenever interferences are not possible, but a person's liberty may, however, still be limited by the power of another individual (domination), the idea of “liberty as non-discrimination” seems more appropriate for ensuring the proper living conditions of individuals. We shall approach two answers: one taking into account the justification of the prohibition as founded in the effect that each action can have on others and, the other, focusing merely on the consequences of the individual action.

Interstitial Telomeric Sequences Are Not Preferentially Involved in the Chromosome Damage Induced by the Methylating Compound Streptozotocin in Chinese Hamster Cells

CONICET Digital -

Interstitial Telomeric Sequences Are Not Preferentially Involved in the Chromosome Damage Induced by the Methylating Compound Streptozotocin in Chinese Hamster Cells Quiroga, Ivana Yoseli; Paviolo, Natalia Soledad; Bolzan, Alejandro Daniel The effect of the methylating compound streptozotocin (STZ) on interstitial telomeric sequences (ITSs) was investigated in Chinese hamster ovary (CHO) cells by using peptide nucleic acid-fluorescence in situ hybridization with a pantelomeric probe. Cells were exposed to increasing concentrations of STZ, and chromosomal aberrations were analyzed at the first mitosis after treatment. The frequency of chromosomal aberrations directly involving ITSs increased in STZ-treated cells by a factor of 2.6 (2 mM) and 3.6 (4 mM) when compared with the frequency of these aberrations in control cells (P < 0.05). However, no significant differences were found between control and exposed cells in the percentage of aberrations directly involving ITSs, demonstrating that these repeat regions were not preferentially involved in the chromosome damage induced by STZ. In addition, STZ did not alter telomerase activity, suggesting that this enzyme may not be involved in the induction of chromosomal aberrations by this compound. Environ. Mol. Mutagen. 54:147–152, 2013.

La trama del polvo y del tiempo: el delito de homicido en Córdoba del Túcuman: siglo VXIII

CONICET Digital -

La trama del polvo y del tiempo: el delito de homicido en Córdoba del Túcuman: siglo VXIII; The plot of dust and time: the crime of murder in Cordoba del Tucumán: XVIII century Aspell, Marcela La presente investigación, que es parte de un trabajo mayor sobre la muerte en la jurisdicción de Córdoba del Tucumán, analiza las formas de la muerte violenta, en un enclave de particulares condicio- nes socio-económicas, vigorosamente marcadas. Una ciudad medite- rránea, cruce de caminos y nudo de comunicaciones para los peregrinos que recorrían las rutas hacia Buenos Aires, Asunción, Santiago o Lima, alejada del teatro de las guerras, pero permanente frontera con el indio, cabecera del obispado, y sede de la Universidad que el 22 de agosto de 1791 incorpora los estudios regulares de Derecho, al crear- se la Cátedra de Instituta, circunstancia que contribuyó eficazmente a difundir el conocimiento y afianzar la práctica del derecho culto, para reemplazar una justicia de jueces legos, cuyo funcionamiento se em- peñaba en controlar la Justicia de Alzada.; This research, which is part of one larger work on death in the jurisdiction of Córdoba del Tucumán, analyzes forms of violent death in particular socio-economic conditions, vigorously marked. Córdoba was a Mediterranean city, crossroads and communications center for the pilgrims who traveled routes to Buenos Aires, Asunción, Santiago or Lima, far away from the theatre of war, but near the permanent border with the Indian, head of the bishopric, and seat of the University, which on 22 August 1791 incorporated regular law studies with the creation of the Chair of Instituta, circumstances that contributed effec- tively to disseminate the knowledge and strengthen the practice of the instituted law, to replace a the lay judges, whose work was controlled by the Justice of Appeal.

Chronic stress and its effects on adrenal cortex apoptosis in pregnant rats

CONICET Digital -

Chronic stress and its effects on adrenal cortex apoptosis in pregnant rats Bozzo, Aida Andrea; Soñez, Carlos Alberto; Monedero Cobeta, I.; Rolando, Alicia Nelida; Romanini, María Cristina; Cots, Debora Soledad; Lazarte, M. A.; Gauna, Hector Fernando; Mugnaini, M The model of chronic intermittent stress by immobilization during pregnancy may produce alterations in the mechanisms that maintain adrenal gland homeostasis. In earlier investigations using this model, signifi cant variations in plasma prolactin and corticosterone levels, and adrenal gland weights were observed. We hypothesized that chronic stress causes changes in apoptosis in the adrenal glands of pregnant rats. We identifi ed and quantifi ed apoptotic cells in the adrenal cortex and examined their ultrastructural characteristics using transmission electron microscopy. Adrenal glands of pregnant rats at gestation days 12, 17 and 21 were studied for control and experimental (stressed) rats. Immunolabelling techniques, stereological analysis and image quantifi cation of adrenal gland sections were combined to determine differences in apoptosis in the different cell populations of the adrenal cortex. The apoptotic index of the experimental rats showed a signifi cant reduction at gestation day 17, while at days 12 and 21 there were no differences from controls. Moreover, the apoptotic index of the reticular zones in control and experimental animals showed a signifi cant increase compared to the glomerular and fascicular zones at the three gestation times studied. Chronic stress by immobilization reduced the caspase-dependent apoptotic index at gestation day 17, which may be related to variations in plasma concentrations of estrogens and prolactin.

Rhizoremediation of phenol and chromium by the synergistic combination of a native bacterial strain and Brassica napus hairy roots

CONICET Digital -

Rhizoremediation of phenol and chromium by the synergistic combination of a native bacterial strain and Brassica napus hairy roots Ontañon, Ornella Mailén; González, Paola Solange; Ambrosio, Laura Fernanda; Paisio, Cintia Elizabeth; Agostini, Elizabeth A bacterial strain resistant to phenol and Cr (VI) was isolated from an industrial polluted soil of Córdoba province (Argentina), which was identified as Pantoea sp. FC 1. This microorganism was able to use phenol as sole carbon source. In addition it was capable of reducing Cr (VI) to Cr (III) in mineral and nutrient media. The isolated strain exhibited some properties as plant-growth promoting bacterium (PGPB), such as production of Indole Acetic Acid (IAA) and synthesis of siderophores, as well as being capable of solubilizing inorganic phosphates. A rhizoremediation system using the association Pantoea sp. FC 1-Brassica napus hairy roots (HRs) was tested for phenol and Cr (VI) removal in a hydroponic system. Microbial inoculation improved both phenol removal and chromium accumulation efficiency by HRs, showing a significant increase in Cr (III) accumulation compared to non-inoculated HRs, exceeding 1000 mg kg−1. Cr (III) was detected in HR biomass and supernatants, suggesting a possible Cr (VI) reducing activity of B. napus HRs. Basic studies in plant model systems, such as HRs, provide additional useful information that could facilitate the transition of this technology into plants suitable for practical rhizoremediation applications.

What stories can the Frankia genomes tell us?

CONICET Digital -

What stories can the Frankia genomes tell us? Tisa, Louis S.; Beauchemin, Nicholas; Gtari, Maher; Sen, Arnab; Wall, Luis Gabriel Among the Actinobacteria, the genus Frankia is well known for its facultative lifestyle as a plant symbiont of dicotyledonous plants and as a free-living soil dweller. Frankia sp. strains are generally classified into one of four major phylogenetic groups that have distinctive plant host ranges. Our understanding of these bacteria has been greatly facilitated by the availability of the first three complete genome sequences, which suggested a correlation between genome size and plant host range. Since that first report, eight more Frankia genomes have been sequenced. Representatives from all four lineages have been sequenced to provide vital baseline information for genomic approaches toward understanding these novel bacteria. An overview of the Frankia genomes will be presented to stimulate discussion on the potential of these organisms and a greater understanding of their physiology and evolution.

(In)versiones de ciudad

CONICET Digital -

(In)versiones de ciudad Ferrero, María Mercedes; Gallego, Ayelén Dominique La producción del espacio urbano se erige como cristalización histórica de las luchas por el poder y el acceso a los recursos. En él se materializan patrones de apropiación, habitabilidad, accesibilidad, exclusividad y fragmentación, como expresión de dichas tensiones y conflictividades. Durante el año 2011 se dio en la ciudad de Córdoba un debate mediatizado sobre la legitimidad de las obras públicas del gobierno provincial, la (in)existencia de licitaciones, la corrupción y el modelo de ciudad. En dicho contexto, alcanzó estado parlamentario en el Concejo Deliberante un documento denominado Bases para el Plan Director 2020 (PD), como primera iniciativa para delinear una política de estado que anticipe y oriente el proceso de transformación de la ciudad, proyectándola como polo de desarrollo económico, social y cultural del centro del país para el año 2020. Esta establece como objetivo fundamental la institucionalización de la metropolización y la densificación de dicha ciudad, así como su (re)conversión en un espacio estratégico de productividad y rentabilidad.

Anisotropy of pore size classes’ connectivity related to soil structure under no tillage

CONICET Digital -

Anisotropy of pore size classes’ connectivity related to soil structure under no tillage Lozano, Luis Alberto; Soracco, Carlos Germán; Cornelis, Wim M.; Gabriels, Donald; Sarli, Guillermo Oliverio; Villarreal, Rafael No-tillage (NT) systems have been increasing during the last several decades. Development of a near-surface layer of laminar structure under NT has also been reported. The objectives of this work were to determine whether preferential connectivity of different pore size classes in two differently textured soils under NT exists and to propose a new index of pore connectivity based on water flux (Cw). The study was carried out at two sites in the Pampas Region of Argentina under long-term NT. Site 1 had a loamy A-horizon, and Site 2 had a sandy loam A-horizon. Undisturbed samples were extracted in vertical and horizontal directions within the first 8 cm of the soil. Saturated hydraulic conductivity (K s), near-saturated hydraulic conductivity (h: −50, −100, −200, −300, and −500 cm), pore size distribution from water retention curve, and total porosity were determined. The index of pore connectivity based on water flux, Cw, was developed as a ratio between K and pore volume for each pore size class. Site 1 showed laminar structure in the A-horizon, whereas Site 2 showed a blocky structure. We found a preferential connectivity in horizontal direction of macropores in Site 1. The index of pore connectivity was useful to assess the presence of preferential orientation of different pore size classes. In future studies, the connectivity of the different pore size classes should not be neglected.

Actualización del conocimiento de los roedores del Mioceno Tardío de la Mesopotamia argentina: aspectos sistemáticos, evolutivos y paleobiogeográficos

CONICET Digital -

Actualización del conocimiento de los roedores del Mioceno Tardío de la Mesopotamia argentina: aspectos sistemáticos, evolutivos y paleobiogeográficos; Update of the knowledge on the Late Miocene rodents from the Argentine Mesopotamia: systematic, evolutionary, and paleobiogeographic aspects Nasif, Norma; Candela, Adriana Magdalena; Rasia, Luciano Luis; Madozzo Jaén, María Carolina; Bonini, Ricardo Adolfo Los roedores registrados en el “Conglomerado osífero”, aflorante en la base de la Formación Ituzaingó (=“Mesopotamiense”, Mioceno Tardío, Edad Mamífero Huayqueriense), pertenecen al grupo de los caviomorfos. En esta unidad, éstos muestran una importante diversidad de especies, representantes de todas las superfamilias y casi todas las familias reconocidas en este infraorden. Presentan una notable variedad de patrones morfológicos, tales como rangos amplios de tamaño corporal y diferentes grados de complejidad dentaria e hipsodoncia. Ambos atributos, diversidad taxonómica y disparidad morfológica, le otorgan a las especies del “Mesopotamiense” una particular importancia para el entendimiento de aspectos evolutivos y biogeográficos en el contexto de la historia de los caviomorfos de América del Sur. A pesar de los avances recientes en la sistemática de estos roedores, particularmente de aquellos registrados en el “Mesopotamiense”, aún quedan por resolver numerosos aspectos referentes al número de especies y a sus afinidades filogenéticas. En este trabajo se actualiza el conocimiento sistemático de los Caviomorpha registrados en la Formación Ituzaingó (provincia de Entre Ríos, Argentina) y se proponen hipótesis preliminares acerca del significado biogeográfico y paleoambiental de algunas de las formas representadas en esta unidad.; Rodents recorded in the “Conglomerado osífero”, outcropping at the base of the Ituzaingó Formation (=“Mesopotamiense”, late Miocene, Huayquerian Land Mammals Age), are included in the Caviomorpha. Remains recovered in this unit show an important species diversity, encompassing all Caviomorph superfamilies and almost all the families recognized within the infraorder. Moreover, these rodents have a great variety of morphological patterns, such as wide body size ranges, and different degree of dental complexity and hypsodonty. Both attributes, taxonomic and morphological diversity, render Mesopotamian species important for the explanation of evolutionary and biogeographic aspects in the context of South American caviomorph history. In spite of the recent advances in the systematics of these rodents, in particular those from the “Mesopotamiense”, several aspects concerning the number of species and their phylogenetic affinities remain unresolved. In this contribution the systematic knowledge of Caviomorpha from the Ituzaingó Formation (Entre Ríos Province) is updated and preliminary hypotheses about the biogeographic and palaeoenvironmental significance of some of them are proposed.

Semblanzas Ictiológicas: Guillermo Martín Caille

CONICET Digital -

Semblanzas Ictiológicas: Guillermo Martín Caille Lopez, Hugo Luis; Ponte Gomez, Justina A través de esta serie intentaremos conocer diferentes facetas personales de los integrantes de nuestra “comunidad”. El cuestionario, además de su principal objetivo, con sus respuestas quizás nos ayude a encontrar entre nosotros puntos en común que vayan más allá de nuestros temas de trabajo y sea un aporte a futuros estudios históricos. Esperamos que esta iniciativa pueda ser otro nexo entre los ictiólogos de la región, ya que consideramos que el resultado general trascendería nuestras fronteras.

Moquiniastrum (Gochnatieae, Asteraceae): disentangling the paraphyletic Gochnatia

CONICET Digital -

Moquiniastrum (Gochnatieae, Asteraceae): disentangling the paraphyletic Gochnatia Sancho, Gisela; Funk, Vicki A.; Roque, Nádia The new genus Moquiniastrum, the result of recent phylogenetic analyses, is described. Although these analyses are based on cpDNA and nDNA, they also involve documentation of the distinctive morphological characters supporting this new genus. The recognition of Moquiniastrum is necessary to accurately reflect the relationships of the taxa found in the tribe Gochnatieae. Moquiniastrum includes twenty-one species that are usually gynodioecious and found mainly in Brazil but with some species elsewhere in South America. A description of Moquiniastrum, together with the corresponding new combinations, new lectotypifications of three names and one new neotypification is here provided.

Cost-benefit of feeding on anthropogenic organic matter: lipid changes in a detritivorous fish (Prochilodus lineatus)

CONICET Digital -

Cost-benefit of feeding on anthropogenic organic matter: lipid changes in a detritivorous fish (Prochilodus lineatus) Speranza, Eric Demian; Tatone, Leandro Martín; Cappelletti, Natalia Elsa; Colombo, Juan Carlos The lipid composition of muscle and liver of detritivorous fish Prochilodus lineatus, settling particles and sediments from reference and polluted areas of the Paraná-Rio de la Plata basin were analyzed to evaluate the impact of feeding on contaminated detritus. Overall, muscular lipids were highly variable (14 ± 13 % wet mass, ww) and increased with body mass trough a rapid triglyceride accumulation [82 ± 7.9 % neutral lipids (NL) for fish weighing less than 1 kg to 99 ± 0.51 % NL for fish weighing more than 4 kg] with a parallel decrease of free fatty acid (13 ± 6.0 to 0.11 ± 0.23 % NL). Liver lipids were more uniform (6.0 ± 2.1 % ww) and were dominated by triglycerides (40 ± 21 % NL) and free fatty acids (34 ± 19 % NL). Compared with fish from reference areas in the North, polluted fish from Buenos Aires presented higher muscular lipid contents (24 ± 13 vs. 3.9 ± 3.1 % ww) and triglyceride abundance (98 ± 3.5 vs. 84 ± 9.7 % NL), and enlarged livers (Hepatosomatic index 1.4 ± 0.4 vs. 0.7 ± 0.2) enriched with esterified cholesterol (20 ± 9.1 vs. 11 ± 9.9 % NL). These differences were consistent with the higher proportions of lipids, enriched with free fatty acids and triglycerides, in stomach contents, settling particles and sediments from Buenos Aires relative to the North of the basin. The change in Prochilodus lineatus diet from organic-poor vegetal detritus in the north to polluted but abundant and fresh anthropogenic matter at Buenos Aires resulted in multiple alterations of lipid metabolism.

Limited Packing and Multiple Domination problems: Polynomial time reductions

CONICET Digital -

Limited Packing and Multiple Domination problems: Polynomial time reductions Leoni, Valeria Alejandra; Nasini, Graciela Leonor The Limited Packing and Multiple Domination problems in graphs have closely-related definitions and the same computational complexity on several graph classes. In this work we present two polynomial time reductions between them. Besides, we take into consideration generalized versions of these problems and obtain polynomial time reductions between each one and its generalized version.

On the first Chvátal closure of the set covering polyhedron related to circulant matrices

CONICET Digital -

On the first Chvátal closure of the set covering polyhedron related to circulant matrices Tolomei, Paola Beatriz; Torres, Luis Miguel We study the set covering polyhedron related to circulant matrices. In particular, our goal is to characterize the first Chvátal closure of the usual fractional relaxation. We present a family of valid inequalities that generalizes the family of minor inequalities previously reported in the literature. This family includes new facet-defining inequalities for the set covering polyhedron.

Páginas

Suscribirse a Facultad de Ciencias Químicas de la Universidad Nacional de Córdoba agregador