Search results for "Oliva"

Ecos ovidianos en una adaptación de Eurípides: Hécuba triste de Pérez de Oliva

2014

Hécuba triste de Pérez de Oliva, considerada una de las primeras traducciones a lengua vernácula de una tragedia griega, es una adaptación peculiar de la Hécuba de Eurípides que incorpora notables cambios, algunos de ellos por influencia de otras tragedias griegas. En este trabajo estudiamos varios motivos utilizados por Oliva que remiten a otros textos, entre los que destacan obras relacionadas directa o indirectamente con Ovidio.

Exposición de la oliva bulbar mediante los abordajes far lateral y retrosigmoideo bajo. Análisis comparativo de la superficie expuesta y ángulo de at…

2021

A lo largo de la historia neuroquirúrgica, el tratamiento de lesiones intrínsecas localizadas en el tronco cerebral ha sido tema de mucha controversia. El tronco cerebral es la estructura anatómica del sistema nervioso central (SNC) que presenta mayor concentración de núcleos y fibras, y su simple manipulación puede conllevar importante morbi-mortalidad. El presente trabajo de investigación, se desarrolla teniendo en cuenta los conocimientos del tronco cerebral desarrollados por el Prof. Evandro de Oliveria. Una vez establecido uno de los puntos de entrada seguros a nivel bulbar, hemos querido evaluar el abordaje más seguro a la oliva bulbar (la principal zona de entrada segura a la región …

Bateman gradients from first principles

2022

In 1948, Angus Bateman presented experiments and concepts that remain influential and debated in sexual selection. The Bateman gradient relates reproductive success to mate number, and Bateman presented this as the cause of intra-masculine selection. A deeper causal level was subsequently asserted: that the ultimate cause of sex differences in Bateman gradients is the sex difference in gamete numbers, an argument that remains controversial and without mathematical backup. Here I develop models showing how asymmetry in gamete numbers alone can generate steeper Bateman gradients in males. This conclusion remains when the further asymmetry of internal fertilisation is added to the model and fe…

Evidence for increased nitric oxide production in the auditory brain stem of the aged dwarf hamster (Phodopus sungorus): an NADPH-diaphorase histoche…

2000

Age-related changes of the auditory system such as presbyacusis are believed to be due, at least in part, to alterations of central structures. The superior olivary complex (SOC), a group of interrelated brain stem nuclei, projects to a variety of neuronal structures including the cochlea and the inferior colliculus (IC). The soluble gas nitric oxide (NO), believed to function as a neuroactive substance within the SOC and cochlea, is thought to be involved in ageing processes. Since it is unknown whether NO-production is altered in the ageing auditory system, the present study was conducted to investigate whether the number of NO-producing cells in the SOC is changed with increasing age. Th…

Body size and mating strategies in the simultaneous hermaphrodite Oxynoe olivacea (Mollusca, Opisthobranchia, Sacoglossa).

2004

Summary 1To better understand the role and importance of body size in hermaphroditic mating system theory, the mating behaviour of the shelled sacoglossan Oxynoe olivacea was studied. This simultaneous hermaphrodite exhibits bilateral and unilateral sperm transfer and thus it is particularly suitable for studies on hermaphrodite sexual conflict. 2In this study three hypotheses on body size were tested: that O. olivacea partner size has an effect on (i) mating mode choice, (ii) duration of mating modes, and (iii) choice of sexual role. Furthermore, we tested Charnov's hypothesis that in O. olivacea, like many simultaneous hermaphrodites, a sexual conflict exists and the male role is preferre…

The Bruce effect revisited: is pregnancy termination in female rodents an adaptation to ensure breeding success after male turnover in low densities?

2017

Pregnancy termination after encountering a strange male, the Bruce effect, is regarded as a counterstrategy of female mammals towards anticipated infanticide. While confirmed in caged rodent pairs, no verification for the Bruce effect existed from experimental field populations of small rodents. We suggest that the effect may be adaptive for breeding rodent females only under specific conditions related to populations with cyclically fluctuating densities. We investigated the occurrence of delay in birth date after experimental turnover of the breeding male under different population composition in bank voles (Myodes glareolus) in large outdoor enclosures: one-male–multiple-females (n = 6 p…

Evolution of external female genital mutilation : why do males harm their mates?

2017

Sperm competition may select for male reproductive traits that influence female mating or oviposition rate. These traits may induce fitness costs to the female; however, they may be costly for the males as well as any decrease in female fitness also affects male fitness. Male adaptations to sperm competition manipulate females by altering not only female behaviour or physiology, but also female morphology. In orb-weaving spiders, mating may entail mutilation of external structures of the female genitalia, which prevents genital coupling with subsequent males. Here, we present a game theoretical model showing that external female genital mutilation is favoured even under relatively high cost…

La aceituna de mesa, su uso y adobo en la historia (I)

2011

La aceituna de mesa, su uso y adobo en la historia

Qualità dell'olio: il ruolo di ambiente e tecniche colturali

2010

Sexual selection, phenotypic plasticity and female reproductive output

2019

In a rapidly changing environment, does sexual selection on males elevate a population's reproductive output? If so, does phenotypic plasticity enhance or diminish any such effect? We outline two routes by which sexual selection can influence the reproductive output of a population: a genetic correlation between male sexual competitiveness and female lifetime reproductive success; and direct effects of males on females' breeding success. We then discuss how phenotypic plasticity of sexually selected male traits and/or female responses (e.g. plasticity in mate choice), as the environment changes, might influence how sexual selection affects a population's reproductive output. Two key points…