Híbridos nuevos en el género "Teucrium l." (laniaceae)

Se describen cuatro nuevas nothoespecies del género Teucrium L. (Sect. Polium) para el sureste de España: T. x rigualii (T. libanitis x T. carolipaui), T. x riosii (T. capitatum subsp. gracillimumxT. carolipaui), T.xriverae (T. capitatum subsp. gracillimumxT. dunense), yT. x robledoi (T. capitatum subsp. gracillimumx T. homotrichum). Asimismo se aportan datos sobre la posición bioclimática, biogeográfica y fitosociológica de cada uno de ellos

Notas fitosociológicas sobre el sudeste ibérico

Se da cuenta de algunos sintaxones nuevos del SE de Espana y más concretamente de la provincia de Alicante (Teucrio-Ulicetum dianii nova, subasociación típica, erinacetosum y ononidetosum; Querco-Pistacietum lentisci (Br.-81., 1935) A. et O. Bons 1950 viburnosum tini var. nova). Así mismo se proponen una combinación nueva (Daphno-Festucetum capillifoliae O.Bolós et Rigual 1967 stipetosum tenacissimae (Alcaraz et Rivas-Martínez in Alcaraz 1984) comb. nova y el nombre corregido de otra (Jasonio-Teucrietum thymifolii (Rigual, Esteve et Rivas Goday 1962) corr.As a result of phytosociological investigation on the "Sierra del Maigmó" (Alicante, Spain) we described a new association (Teucrio�Ulicetum dianii) with some subassociations. We make a new combination and, according to the Code of Phytosociological Nomenclature, we propose the correction of Jasonio�Teucrietum thymifolii

Diversification: A Value-Creating or Value-Destroying Strategy? Evidence from the Eurozone Countries

[EN] In this paper, we provide evidence on how diversification strategy impacts on excess value in a sample of Eurozone firms by using the data panel methodology. Specifically, we study the effect of the levels and types of the product diversification on the premium or discount that diversified firms trade at. Preliminary results are consistent with the value-destroying expectations and show that diversified companies trade at a discount in the Eurozone countries. However, a more accurate analysis reveals that the relation between diversification and excess value is non-linear; that is, diversification strategy first creates value and then, after a certain breakpoint, destroys it, giving rise to an optimal level of diversification, pointing out to both benefits and costs of this strategy. Moreover, our results show that related diversification is more value-creating than non-related diversification, and that non-related diversification is likely to turn into a value-destroying strategy at lower levels than related diversification

Calculation of threshold Olsen P values for fertilizer response from soil properties

Phosphorus (P), a non-renewable resource, needs to be used more efficiently in agriculture. This requires using soil P tests. However, the P test threshold values for fertilizer response depend on many soil properties, some of which may be useful to estimate these threshold values, others not. Therefore, we searched here which soil properties are useful to estimate P threshold values. We calculated the threshold values for Olsen P and 0.01 M CaCl2 extractable P of 18 representative agricultural soils of the Mediterranean region of Spain. For that, we performed a P starvation experiment in which wheat and sunflower were alternatively pot-cropped. Results show that Olsen P threshold values are negatively correlated to P buffer capacity (r of −0.74, P lower than 0.001), clay content (−0.82, 0.001), pH (−0.76, 0.001), and Fe oxide content (−0.55, 0.05). Multiple regression models involving clay, pH or soil organic C, and phosphatase activity or organic hydrolysable P accounted for as much as 87 % of the variance in calculated Olsen P threshold values. In particular, there is a major effect of organic P on Olsen P threshold values. Single models based on routinely measured soil properties such as clay content and pH made accurate predictions of Olsen P threshold values with r 2 of 0.81 and P lower than 0.001

Un nuevo híbrido del género Thymus L. (Lamiaceae).

.

Implantación de metodologías activas de enseñanza en varias asignaturas de finanzas: una experiencia práctica

Tras la Declaración de Bolonia, mantener a los alumnos universitarios motivados y comprometidos constituye una de las principales metas para los profesores universitarios. No cabe duda que determinadas metodologías activas de enseñanza, como la enseñanza basada en proyectos, el fomento del trabajo en equipo y la implantación de la acción tutorial, contribuyen a una mayor participación de los alumnos y, por tanto, a aumentar su motivación para el aprendizaje. En este trabajo damos los principales conceptos teóricos sobre las mimas y contamos nuestra experiencia sobre su implantación, ya que progresivamente las vamos introduciendo en nuestras asignaturas de finanzas, básicamente en dentro de Escuela Universitaria de Estudios Empresariales de la Universidad de Sevilla, tanto de la Diplomatura de Empresariales como la de Turismo

Una subespecie nueva en el género Sideritis L. (Lamiaceae)

.