Efecto nutraceutico de los taninos condensados libres de lysiloma acapulcensis (kunth) benth sobre la infestación parasitaria y respuesta productiva de borregos

Propiedades nutracéuticas de Lysiloma acapulcencisForty-five Pelibuey sheep were experimentally infected with nematodes to evaluate the effect of three free condensed tannin (FCT) levels of Lysiloma acapulcensis on faecal egg counts (FECs), packed cell volumes (PCV), ocular mucosa colours (OMC), average daily gain (ADG), and adult nematode count. Five treatments were used: 12.5, 25.0, and 37.5 mg of FCT kg−1 of body weight (BW); sterile water (control); and ivermectin (0.22 mg kg−1 of BW) as chemicalgroup. The data were processed through repeated measurement analysis. Even though the three FCT doses decreased (P < 0.05) the FEC, the highest reduction was obtained with 37.5 mg kg−1of BW. No differences were observed in PCV and OMC. Higher ADG (P < 0.05) was observedwith 37.5 mg kg−1 of BW of FCT. The count of adult nematodes (females and males) in the higher dose of FCT was similar to chemical treatment. Dose of 37.5 mg kg−1 of BW decreased the parasite infection and improved the lamb performance. Therefore, this dose could be used as a nutraceutic product in sheep production.Facultad de Medicina Veterinaria y Zootecnia UAE

El paradigma de la ciencia política y la administración pública: retos a los que se enfrentan en el siglo XXI

En el presente artículo se plantean los retos a los que se enfrentan dos disciplinas fundamentales para entender el quehacer político y gubernamental, ante una sociedad cada vez más plural y demandante de cara al siglo XXI. Entender a la ciencia política y a la administración pública frente al sistema capitalista en el cual ambas nacen y se desarrollan, entrelaza necesariamente la evolución de la ciencia política en distintas épocas, donde se localiza también el surgimiento de la administración pública como disciplina científica. Este recorrido histórico tiene el fin de identificar sus principales transformaciones y aquellas que son necesarias para consolidar a la ciencia política y a la administración pública como disciplinas útiles y valiosas para las nuevas sociedades

Reseña de "Homo Academicus" de Pierre Bourdieu

En la actualidad, las ciencias sociales han ampliado su objeto de estudio con la intención de consolidarse como disciplinas que puedan influir en su entorno inmediato, objetivizándolo, para lograr una aproximación a diversos temas y, a su vez, un acercamiento hacia su propia identidad como investigadores. Tal es el caso de Pierre Bourdieu, quien entre 1968 y 1987 elaboró un estudio sociológico sobre su propio ámbito: el campo universitario. Su Homo Academicus pretende mostrar al campo universitario como un espacio de constante lucha, de desigualdades, de competencias y de formas de dominación institucionalizadas y por todos aceptadas y reproducidas, hasta identificar y analizar el momento donde se pone en riesgo la continuidad de los patrones institucionales dominantes

Innovation and jobs: evidence from manufacturing firms

This paper is aimed at structurally assessing the employment effects of the innovative activities of firms. We estimate firm level displacement and compensation effects in a model in which the stock of knowledge capital raises firm relative efficiency through process innovations and firm demand through product innovations. Displacement is estimated from the elasticity of employment with respect to innovation in the (conditional or Hicksian) demand for labour. Compensation effects are estimated from a firm-specific demand relationship. We also assess the enlargement and weakening of these effects due to firm agents’ behaviour aimed at appropriating innovation rents. We find that the potential employment compensation effect of process innovations surpasses the displacement effect, both in the short and long run (when competitors react), and that product innovation doubles the expanding impact by unit of expenditure, but also that agents’ behaviour can seriously reduce these effects. The actual elasticity of employment to knowledge capital is estimated, however, not far from unity, while “passive” productivity growth is suggested to have null or negative employment effects.

WARM STRATIFICATION INCREASES GERMINATION OF DENDROMECON RIGIDA AND EHRENDORFERIA CHRYSANTHA

We explored the seasonal factors that might play a role in triggering germination of Dendromecon rigidaand Ehrendorferia chrysantha.D. rigida and E. chrysantha have been found difficult to germinate using common greenhouse techniques, Keeley and Fotheringham successfully germinated both species after storing their seeds in the field over a year and treating them with smoke. Identifying the specific seasonally changing factors that stimulated germination could have implications for understanding germination requirements for these and other hard-to-germinate chaparral species. Dendromecon rigidaand Ehrendorferia chrysanthaare part of the Papaveraceae family and both are found in the chaparral environment in Southern California. Both species are known to increase in numbers after fire events. Both are believed to have morphophysiological dormancy based on their miniscule embryo and increase in seedling presence after fire events. Climate within the chaparral environment consists of hot, dry summers and cold, wet winters. Storing seeds of D. rigidaand E. chrysantha in the field over winter and spring months resulted in increasing germination for D. rigida seeds that were imbibed in smoke-water. Germination of D. rigidaseeds occurred within six weeks and no further germination was noted beyond that. Ehrendorferia chrysanthaseeds failed to germinate in the field. Lab studies tested effects of stratification at different temperatures (5ºC, 10ºC, 18ºC, 25ºC and 30ºC), stratification for different durations (0, 2, 4, 8, and 12 weeks), heat-shock, and fluctuating moisture and temperature conditions on a weekly time scale, on germination of both species. Of all these treatments the only combination that was effective in germinating seeds of D. rigidaand E. chrysanthawas warm stratification at 30ºC for 8 weeks following smoke-water imbibition. Under these conditions seeds of D. rigidaand E. chrysanthagerminated to 10% and 9.3%, respectively. Further studies on D. rigidaindicated a stratification temperature optimum between 30-40ºC with germination increasing with lack of light. These tested conditions corresponded to the daily peak soil temperatures measured at shallow depth in an area of chaparral inhabited by D. rigida. The period immediately after the first rain event after a fire may provide the chemical cues and warm stratification required to germinate buried seeds in this species