Both environmental heterogeneity and mode of dispersal may affect species co-occurrence in metacommunities. Aquatic invertebrates were sampled in 20-30 streams in each of three drainage basins, differing considerably in environmental heterogeneity. Each drainage basin was further divided into two equally sized sets of sites, again differing profoundly in environmental heterogeneity. Benthic inv...

Many single-cell observables are highly heterogeneous. A part of this heterogeneity stems from age-related phenomena: the fact that there is a nonuniform distribution of cells with different ages. This has led to a renewed interest in analytic methodologies including use of the 'von Foerster equation' for predicting population growth and cell age distributions. Here we discuss how some of the m...

In this article, we suggest a new statistical approach considering survival heterogeneity as a breakpoint model in an ordered sequence of time-to-event variables. The survival responses need to be ordered according to a numerical covariate. Our estimation method will aim at detecting heterogeneity that could arise through the ordering covariate. We formally introduce our model as a constrained ...

The long-term effectiveness of the mainly chemotherapy-based control strategy of the World Bank Loan Project (WBLP) for schistosomiasis control in Chinese hilly and mountainous regions was evaluated with a view to determine the best road forward. Based on the national database of schistosomiasis prevalence for the periods of 1999-2001 and 2007-2008 in the People's Republic of China, a Bayesian ...

and some of their physical and chemical water properties (temperature, pH) are similar. In the contrary, the distribution of species is very heterogeneous. Fifty per cent of species were found only in one or two localities. Moreover, the Park is located in a high altitude area (2238 m.a. s.l.) and the composition of species is similar to that found in temperate zones. In our view, if some ecolo...

Myocardial fibrosis is an important risk factor for cardiac arrhythmias. Previous experimental and numerical studies have shown that the texture and spatial distribution of fibrosis may play an important role in arrhythmia onset. Here, we investigate how spatial heterogeneity of fibrosis affects arrhythmia onset using numerical methods. We generate various tissue textures that differ by the mea...

Seamless sharing and exchange of geospatial information between systems in a distributed environment, like the Internet, is an essential requirement for such information to evolve as a necessary tool in every day’s activities. Perhaps the most difficult problem facing the pursuing of this goal is that of semantic heterogeneity. From the database perspective semantic heterogeneity arises from di...

This paper evaluates the effects of job creation schemes on the participating individuals in Germany. Since previous empirical studies of these measures have been based on relatively small datasets and focussed on East Germany, this is the first study which allows to draw policy-relevant conclusions. The very informative and exhaustive dataset at hand not only justifies the application of a mat...

Semantic heterogeneity is a major barrier to geodata sharing. The aim of this paper is to improve understanding of semantic heterogeneity. It provides discussions on what semantic heterogeneity of geodata is, what its sources are, what semantic heterogeneity is irresolvable and how to avoid. The conclusion is semantic poverty and poor conceptual modeling are major forms of semantic heterogeneit...

Development of resistance limits transferability of most anticancer therapies into curative treatment and understanding mechanisms beyond it remains a big challenge. Many high resolution experimental observations show enormous intratumor heterogeneity at molecular, genetic and cellular levels which is made responsible for emerging resistance to therapy. Therefore, researchers search techniques ...