PUMAS is a framework based on agents and a Peer to Peer (P2P) approach, which allows nomadic users to access several information sources through different types of devices (eventually mobile). PUMAS provide the nomadic user with information adapted to her/his preferences and to the characteristics of the context of use (i.e. location, connection moment, inherent characteristics of the aceess de...

To examine the in vivo function of presenilin-1 (PS1), we selectively deleted the PS1 gene in excitatory neurons of the adult mouse forebrain. These conditional knockout mice were viable and grew normally, but they exhibited a pronounced deficiency in enrichment-induced neurogenesis in the dentate gyrus. This reduction in neurogenesis did not result in appreciable learning deficits, indicating ...

The idea of laser isotope enrichment grew from the laser’s ability to concentrate its output power in a narrow range of wavelengths. Different isotopes of the same element are very hard or impossible to separate chemically, but the difference in their masses leads to differences in their spectra, which in principle can be used to selectively excite one isotope and isolate it by some photo-induc...

1,2-Dichloropropane (1,2-D), a widespread groundwater contaminant, can be reductively dechlorinated to propene by anaerobic bacteria. To shed light on the populations involved in the detoxification process, a comprehensive 16S rRNA gene-based bacterial community analysis of two enrichment cultures derived from geographically distinct locations was performed. Analysis of terminal restriction fra...

We take a model-theoretic viewpoint on security goals and how to establish them. The models are (possibly fragmentary) executions. Security goals such as authentication and confidentiality are implications over the geometric fragment of predicate logic, i.e. implications Φ −→ Ψ where Φ and Ψ are built from atomic formulas without negations, implications, or universal quantifiers. Security goals...

In this paper, we propose a construction and enrichment process of ontologies from texts. Ontologies are formal structures in which the concepts of a domain and relationships between them are formally defined. An increasing number of papers are dealing with ontologies but their construction and enrichment processes still a problem. Our construction approach is based on terms’s research into tex...

Unlike text on paper, hypertext enables the linking of pieces of text with other texts and multimedia resources, which not only improves the way we read but also lays the foundation for new information systems. Specifically, the proliferation of collaborative sites, blogs, online databases, encyclopedias and many other services on the World Wide Web provides an invaluable source of up-to-date i...

heavy metals in the surface sediments of the two coastal ecosystems of cochin, southwest india were assessed. the study intends to evaluate the degree of anthropogenic influence on heavy metal concentration in the sediments of the mangrove and adjacent estuarine stations using enrichment factor and geoaccumulation index. the inverse relationship of cd and zn with texture in the mangrove sedimen...

A one-dimensional, physically based numerical model was constructed to describe the isotopic enrichment observed in throughfall of snow intercepted on evergreens. The process of enrichment is similar to that which results in formation of depth hoar in snowpack. On-site data were obtained at a high-altitude (3500 m) watershed in the Colorado Rocky Mountains. The model includes the ambient atmosp...

yersiniosis is a common infection in human and animals. yersinia enterocolitica infection has been associated with a variety of clinical manifestations. this bacterium has been isolated from water, meat, milk environment, animals and so on. our studies have been accomplished about isolation of y. enterocolitica from vegetables such as lettuce, carrot, celery, parsley, tomato, cabbage, radish, m...