BACKGROUND Longitudinal dissociation of an anatomic pathway into 2 electrophysiologically distinct pathways has been hypothesized as a basis for localized AV nodal reentry and supraventricular arrhythmias. METHODS AND RESULTS Extracellular bipolar and intracellular microelectrodes were used to record activation in the superfused rabbit AV junction. A subset of rabbit hearts (n=19 of 72) demon...

An RNA-directed DNA polymerase was isolated from the peripheral blood leukocytes of a patient with acute myelomonocytic leukemia by successive purification of a particulate cytoplasmic fraction with endogenous, ribonuclease-sensitive DNA polymerase activity. Like RNA-directed DNA polymerase from mammalian type-C virus, the human leukemic cell enzyme efficiently utilized (A)(n).(dT)(12-18) and (...

This paper adopts a cognitive theory of analogy and applies it to the design of decision support systems. The approach, called structure mapping, captures the conceptual structure of a C2 problem in the graphical features of a visual display. The result is a visualization that supports decision making better than standard mappings of geospatial information. As an example we present a system des...

In this paper we propose an approach to handle the cooperative localization of an object by a team of robots. Our technique uses propagation of beliefs to combine information provided by a team of robots so as to support a teammate in critical situations when it can not see an object, is lost or it is equipped with low quality sensors and needs cleaner data. Since teammates are a special case o...

Link-based data may be studied formally by means of unordered trees. On a dataset formed by such link-based data, a natural notion of support-based closure can be immediately defined. Abstracting information from subsets of such data requires, first, a formal notion of intersection; second, deeper understanding of the notion of closure; and, third, efficient algorithms for computing intersectio...

Focusing on the relationship between built environmental characteristics and environmental preference, the present study aims to investigate the expressed aesthetic preference toward different architectural styles of buildings in reference to how old they are. The graph model of Mallot (2000) assumes that the main issue relative to the spatial behaviour refers to the relationship between type o...

Bialgebraic semantics, invented a decade ago by Turi and Plotkin, is an approach to formal reasoning about well-behaved structural operational specifications. An extension of algebraic and coalgebraic methods, it abstracts from concrete notions of syntax and system behaviour, thus treating various kinds of operational descriptions in a uniform fashion. In this talk, the current state of the art...