119,040 research outputs found
Suinicoltura: la reddività cala, serve una vera politica di filiera
No full textSuinicoltura: la reddività cala, serve una vera politica di filier
Biographical sketchs of Iberoamerican Ichthyology: Plutarco Cala Cala.
No full textA través de esta nueva serie tratamos de conocer diferentes aspectos personales de los integrantes de la comunidad ictiológica iberoamericana.Esta iniciativa, comparte el espíritu y objetivo de las semblanzas nacionales buscando informalmente, otro punto de unión en la “comunidad de ictiólogos iberoamericanos”. Quizás esté equivocado en mi apreciación, pero creo que vale la pena este intento, ya que, con la colaboración generosa e insoslayable de los integrantes de este “universo”, señalaremos un registro en el tiempo de la Ictiología Neotropical.Facultad de Ciencias Naturales y Museo, UNLPProBiota: Programa para el estudio y uso sustentable de la biota australDebe citarse:
LÓPEZ, H. L. & J. PONTE GÓMEZ. 2015. Semblanzas Ictiológicas Iberoamericanas: Plutarco Cala Cala. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 24(19): 1 20. ISSN 1515 9329
Middle and early upper Pleistocene human occupations in Southern Italy. A reassessment of the assemblages from Cala d’Arconte, Capo Grosso and Cala Bianca
No full textIn southern Italy, the number of Acheulean sites in a secure stratigraphic context is small and sites with control over the age of the deposit and of the artefacts are even less. The open-air sites of Cala d’Arconte, Capo Grosso and Cala Bianca, located along the Italian south-west coastline, represent, in this context, an important source of information for the Lower Paleolithic. These sites were discovered and preliminarily studied in 1967–70 by A. Palma di Cesnola and P. Gambassini of the University of Siena, who ascribed them to the Acheulean due to the recovery of several handaxes associated with flaking reduction systems part of which attributed to the Levallois technology. A small number of the handaxes was recovered in its stratigraphic position while Levallois artefacts were collected exclusively on surface, leaving the question about the relations between these two groups unsolved. Here, the sites of Cala d’Arconte, Capo Grosso and Cala Bianca and their lithic collections are reinvestigated by re-evaluating the stratigraphy at each locality and by analyzing the techno-typology of the available artefacts. During a test trench carried out at Cala Bianca, several Levallois artefacts were discovered in situ in the uppermost part of the sequence in a layer located above a tephra recently attributed to the X-6 marker of the Monticchio series dated to 108.33 ± 1.08 ka. We suggest that these in situ Levallois artefacts belong to a Mousterian layer that must be considered as the most plausible origin for the Levallois assemblage previously collected out of context at this site. In turn, we also suggest that the Levallois and biface components collected from the surface at Cala Bianca and Capo Grosso derive from distinct occupations in time.NWOVI.C.191.070European Prehistor
Validez de instrumento cala para evaluar asesorías académicas virtuales
No full textThis article shown the validity and reliability of instrument to measure the quality of academic assessment CALA, using dimensions of servqual, quality service model. Objective is the evaluation of perception about the quality of academic assessment through a virtual platform in elementary school institutions. The methodology follows validation of descriptive studio of multidimensional scales, design quasi experimental, factorial analysis technique. Sample was constituted by 1117 students of elementary school institution with mean age of 9.6 years old. Results: 24 indicators in satisfaction dimensions in availability of contents – didactic resources, feedback-follow-up, accessibility, comfort, proper internal consistency α=0.9 (Conbrach, 1951), global intra class correlation coefficient 0.8 (IC of 95%, 0.78 0.82) and Kappa indexes (Cohen, 1960) superiors to 0.78, shown a highly concordance between experts.El artículo presenta la validez y fiabilidad del instrumento CALA utilizando dimensiones del modelo de calidad de servicio servqual. Su objetivo es evaluar la percepción de la calidad de asesorías académicas a través de plataforma virtual en instituciones de educación básica. La metodología sigue estudio descriptivo de validación de escalas multidimensionales, diseño cuasi-experimental, técnica análisis factorial. La muestra estuvo constituida por 1117 estudiantes de instituciones de educación básica del Departamento Norte de Santander, con edad promedio de 9,6 años con una DT de 1,47 años. Resultados: 24 indicadores en dimensiones satisfacción en disponibilidad de contenidos-recursos didácticos, seguimiento-retroalimentación, accesibilidad, comodidad-confort, consistencia interna adecuada (alfa de cronbach 0,9), coeficiente de correlación intraclase global 0,8 (IC del 95%, 0,78-0,82) e índices de Kappa superiores a 0,78, muestra alto acuerdo entre expertos. Conclusión: CALA, es un instrumento válido y confiable para identificar la percepción de la calidad de la asesoría académica
Multipoint rational approximants with preassigned poles
No full text20 pages, no figures.-- MSC1991 codes: 41A21, 42C05, 30E10.MR#: MR1820073 (2002i:41021)Zbl#: Zbl 1160.41305Let be a finite positive Borel measure whose support is a compact regular set contained in . For a function of Markov type , z\in\Bbb C\sbs S(\mu), we consider multipoint Padé-type approximants (MPTAs), where some poles are preassigned and interpolation is carried out along a table of points contained in \overline{\Bbb C}\sbs {\rm Co}(S(\mu)) which is symmetrical with respect to the real line. The main purpose of this paper is the study of the `exact rate of convergence' of the MPTAs to the function .Research by first author (F.C.) partially carried out at the Mathematics Department of Umeå University under Guest Scholarship from the Swedish Institute. Research by second author (G.L.L.) partially supported by Dirección General de Enseñanza Superior under grant PB 96-0120-CO3-01 and by INTAS under grant 93-0219 EXT.Publicad
Effects of alcohol on length and weight of young of the year ide Idus idus (L.) and roach Rutilus rutilus (L.) Effects of alcohol on length and weight of young of the year ide Idus idus (L.) and roach Rutilus rutilus (L.)
No full textCambios en la longitud fueron observados mediante subsecuentes medidas de peces sacrificados y almacenados en alcohol al 80%. Alevinos Idus idus (L.) disminuyeron su longitud original a 96% (muestra A) y a 98% (muestra B) en menos de 24 horas (Tabla 1), y subsecuentementelos alevinos muy pequeños, se encogieron hasta ca. de 95% mientras los más largos no mostraron cambios posteriores.Alevinos Rutilus rutilus (L.) disminuyeron su longitud original a94% (muestra A) y a 98% (muestras B y C) en menos de 24 horas (Tabla 1). Subsecuentemente, los alevinos muy pequeños (muestra A) disminuyeron su longitud hasta Ca. de 93%, los de la muestra B hasta ca, de 97%, mientras que los más largos (muestra C) no mostraron cambios posteriores.Los cambios proporcionados en peso entre los peees de diferente tamaño varían muy poco. Alevinos L. idus y R. rutilus (Tablas 1 y 2) disminuyeron hasta ca. de 80% de su peso original en menos de 2 días, Cambios posteriores, en peso, con el tiempo fueron considerados insignificantes, excepto en la muestra A (Tabla 2). La diferente pérdida aparente de peso de L. idus (muestra A, Tabla 1) y de R. rutilus (muestra A, Tabla 2) puede ser debido a algún error sistemático durante las mediciones, ya que las edades y longitudes de los peces de las dos muestras eran más o menos las mismas. Cambios de longitud y peso de los peces fueron registrados tanto durante anestesia como después de muertos y mantenidos en agua o en seco. Se concluyó que en los peces puestos bajo anestesia, el peso debe ser observado tan pronto conto cese el movimiento voluntario para así poder aproximarse al peso en vivo. Anestesia prolongada (aunque los movimientos respiratorios puedan continuar) y la muerte afectan la osmorregulación. Los peces mantenidos en agua dulce después de la muerte ganan peso y se encogen menos en comparación con los peces mantenidos en seco, los cuales pierden peso. De acuerdo con Parker (1963), puede concluírse que factores standards de corrección no son generalmente usuales. Los factores de corrección habrán de ser determinados para cada estudio tomando en cuenta el estado original y el tamano del pez, tipo y concentración iónica del preservativoy el tiempo que el pez es almacenado en él. Así, el factor decorrección puede ser diferente, por ejemplo, inclusive para la misma especie, para quienes consideren el factor rigor mortis y para aquellos que no lo consideren.Changes in length were recorded by sequential measurements of fish killed and stored in 80% ethanol. Young-of-the-year ide shrank to 96% (sample A) and to 98% (sample B) of original length in less than 24 hours (Table 1), and subsequently the smaller fry, shrank to about 95% while the larger ones showed no further change. Young-of-the-year roach shrank to 94% (sample A) and to 98% (samples B and C) of original length in less than 24 hours (Table 2) Subsequently the smaller fry (sample A) shrank to about 93%, those in sample B shrank to about 97%, while the larger ones (sample C) showed no further change. The proportionate changes in weight among fishes of different sizes varied very little. Young-of-the-year ide and roach (Table 1 and 2) diminished to about 80% of their original weigth in less than two days. Further changes with time were considered insignificant, except in sample A in Table 2.The apparent different loss of weight in ide (sample A, Table 1) and in roach (sample A, Table 2) could be due to SOme systematic error during measurements, because the age and length of the fish of the two samples were more or less the same. Changes in length and weight were recorded during anaesthesia and after the death of fishes kept in water and without it. It was concluded that, for fish under anaesthesia, weight must be observed as soon as voluntary movement ceases in order to approximate the live weight. Prolongedanaesthesia (although respiratory movement may continue) and death affect osmoregulation. Fish kept in freshwater after death gain weight and shrink less in comparison with fish kept out of water, which lose weight. In accordance with Parker (1963) it can be concluded that no standard correction terms would be generally usable. Correction terms would have to be determined for each study taking into account the originalstate and size of fish, type and ionic concentration of the preservative and the length of time during which the fish is stored in it. Thus, the correction factor can be different, for instance, even for the same species, for those who consider the factor rigor mortis and for those who do not
El subestrat algal de l'herbei de Posidonia oceanica (L.) Delile de Cala Gat (NE de Mallorca)
No full text3 páginasAlgal undergrowth of the Posidonia oceanica meadow in Cala Gat
(NE of Majorca, Balearic Islands)
The floristic composition of the Posidonia oceanica beds in Cala Gat is studied . The
dominance of Melobesiae and Sphacelaria cirrosa is remarked . Records of Gelidiella antipai
M. Celan and Lophosiphonia scopulorum (Harvey) Womersley are new to the Balearic Islands.Peer reviewe
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mucocutaneous relapse during late latent syphilis as initial presentation of HIV infection
No full textSyphilis is a re-emerging sexually transmitted infection. According to the definition, latent syphilis is characterized by seroreactivity without clinical manifestations. Here, we reported an atypical case of syphilis in a patient with HIV na & iuml;ve to the antiretroviral treatment characterized by mucocutaneous relapse that occurred in the late latent stage. The patient reported his last sexual intercourse about 18 months ago and had self-healing genital and palmoplantar lesions more than 1 year before the presentation. He denied any other types of sexual relationship. He presented with mucocutaneous scattered lesions on his face, neck, palms, soles, penis, and scrotum. He was compliant with arthralgias, myalgias, asthenia, new onset stypsis, and mild anorectal pain. Testing for Syphilis and HIV returned positive. Opportunistic infections were excluded, and antiretroviral therapy with a bictegravir-based regimen was started. Syphilis was treated successfully with three doses of 2.4 million units of benzathine penicillin
Validity of CALA instrument to evaluate academic virtual assessment
No full textEl artículo presenta la validez y fiabilidad de instrumento para medir la calidad de las asesorías académicas CALA, utilizando
dimensiones del modelo de calidad de servicio servqual. Su objetivo es evaluar la percepción de la calidad de asesorías académicas a través de plataforma virtual en instituciones de educación básica. La metodología sigue estudio descriptivo de validación
de escalas multidimensionales, diseño cuasi-experimental, técnica análisis factorial. La muestra estuvo constituida por 1117
estudiantes de instituciones de educación básica, con edad promedio de 9.6 años. Resultados: 24 indicadores en dimensiones
satisfacción en disponibilidad de contenidos-recursos didácticos, seguimiento-retroalimentación, accesibilidad, comodidad-confort,
consistencia interna adecuada α=0.9 (Conbrach, 1951), coeficiente de correlación intraclase global 0.8 (IC del 95%, 0.78-0.82)
e índices de Kappa (Cohen, 1960), superiores a 0.78 muestra alto acuerdo entre expertosThis article shown the validity and reliability of instrument to measure the quality of academic assessment CALA, using dimensions of servqual, quality service model. Objective is the evaluation of perception about the quality of academic assessment
through a virtual platform in elementary school institutions. The methodology follows validation of descriptive studio of
multidimensional scales, design quasi experimental, factorial analysis technique. Sample was constituted by 1117 students of
elementary school institution with mean age of 9.6 years old. Results: 24 indicators in satisfaction dimensions in availability of
contents – didactic resources, feedback-follow-up, accessibility, comfort, proper internal consistency α=0.9 (Conbrach, 1951),
global intra class correlation coefficient 0.8 (IC of 95%, 0.78-0.82) and Kappa indexes (Cohen, 1960) superiors to 0.78, shown
a highly concordance between expert
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