Platelet-derived growth factor (PDGF) is a connective tissue cell mitogen that originally was purified from human platelets, but recently has been found to be produced by many different cell types (reviewed by Ross et al. 1986; Heldin and Westermark, 1989). The in vivo function of PDGF remains speculative, but the fact that PDGF is released by platelets and by cells involved in the inflammatory...

scale analyses are essential for revealing how the infl uence of specifi c ecological factors changes with scale (Wiens 1989). In this study, we present a novel methodology that can be broadly-applied to assess the scale-dependency of species ’ distributions. Distribution changes – such as those that occur in response to species introductions or climate change – provide ecological experiments t...

Genetic analyses of natural populations have historically relied on statistical procedures based on the concept that distinct ‘‘populations’’ of a species exist across a landscape. Invariably, commonly used analyses reduce to approaches that treat collections of individuals (‘‘populations’’) as independent/causative variables and allele frequencies as dependent/ response variables. Examples of ...

The development and application of the TAPES: Terrain Analysis Programs for the Environmental Sciences software tools described in this book was motivated by our view of the world as a stage on which a series of hierarchically scaled biophysical processes are played out (Figure 1.1). This approach is useful because it can handle the complexity of individual landscape processes and patterns as w...

this paper presents results of applying a new approach on 2d inversion of magnetotelluric (mt) data in order to enhance resolution and stability of the inversion results. due to non-linearity and limited coverage of data acquisition in an mt field campaign, minimizing the error by linearization of the problem in least squares inversion usually leads to an ill-posed problem. in general, an inver...

Other tumours that have been reported in HIV -positive persons but for which an association with the infection is not convincing incIude mesothelioma (Behling et al., 1993), cerebral glial tumours (Chamberlain, 1994; MouIignier et al., 1994) and cancer of the colon (Kaplan et al., 1987; Cappell et al., 1988), pancreas (Kaplan et al., 1987; Monfardini et al., 1989) and kidney (Monfardini et al.,...

In this article, we generalize the position value, defined by Meessen (1988) for the class of deterministic communication situations, to the class of generalized probabilistic communication situations (Gómez et al. (2008)). We provide two characterizations of this new allocation rule. Following in Slikker’s (2005a) footsteps, we characterize the probabilistic position value using probabilistic ...