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Background Sympatric speciation—the divergence of populations into new species in absence of geographic barriers to hybridization—is the most debated mode of diversification of life forms. Parasitic organisms are prominent models for sympatric speciation, because they may colonise new hosts within the same geographic area and diverge through host specialization. However, it has been argued that th
When we talk about something, we need to indicate what we talk about. Sometimes we can use pointing gestures but mainly we have to rely on words. A pointing gesture can direct attention in perceived space, but how do we direct attention with words? What can we do with speech sounds we hear, to find out what somebody wants to tell us about something and what that something is? Questions about refer
The instantaneous response models the rapid part of the interaction between electromagnetic fields and materials. From a physical point of view the instantaneous response is non-observable and from a mathematical point of view it constitutes the principal part of the Maxwell equations. In this paper, it is shown that the instantaneous response is not uniquely determined from a given set of values o
Experiments performed with the high contrast 0.7 J, 35 fs Ti:Sapphire laser at the Lund Laser Centre focused into a supersonic helium gas jet have demonstrated the production of quasi-monoenergetic electron beams with energies up to 150 MeV. The beam is a result of controlled wavebreaking of a wakefield generated by the relativistically channeled laser beam. Under the best conditions of laser ener
Informal investors have been highlighted as important stakeholders for potential high-growth ventures. Extant empirical research provides evidence that they contribute not only with money but also bring added value in terms of providing their skills and experience to support the continued development and growth of the ventures in which they have invested. However, despite the reported benefits of
Description of the paper – e.g. topic, research question, objective, purpose, value, conceptual or theoretical framework, state of the art: Adult learning is a subject of ever growing interest, as the population of persons 65 and older grows in industrialised countries. By 2010 the number of retired persons in the European Union will be almost twice as large as in 1995 (Ilmarinen & Costa, 2000
