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Virtual communities have become an important new organizational form and yet relatively little is known about the conditions which lead to their success. In an attempt to address this knowledge gap, a particular subset of virtual communities open source software project communities is investigated and four hypotheses are asserted which relate social network(More)
E-learning has seen tremendous growth in recent years. More and more, university courses are now available online to a potentially global audience. however, a significant shortcoming of e-learning technologies has been poor support for grouporiented learning. We believe that virtual worlds offer a potential solution. Unlike videoconferencing (for instance),(More)
BACKGROUND Although case-control studies conducted to date have largely affirmed the relationship between polychlorinated biphenyls (PCBs) and non-Hodgkin lymphoma (NHL), occupational cohort studies of PCB-exposed workers have been generally interpreted as negative, thereby raising doubts about a potential causal association. A common theme of immune(More)
The combined Descemet's membrane (DM) and posterior collagenous layer (PCL) of Fuchs' endothelial dystrophy corneas were isolated and characterized by biochemical and immunofluorescence methods. The amino acid composition of the Fuchs' DM-PCL was similar to age-matched normal Descemet's membranes (DM). As determined by sodium dodecyl sulfate polyacrylamide(More)
Comparative morphological studies were conducted on adherent cells in bone marrow cultures obtained from humans, dogs, and mice. Scanning electron micrographs demonstrated that the adherent colonies are much more homogeneous in humans and dogs and appear larger and more flattened than in mice. In mice, many more rounded cells (macrophages) were seen(More)
Increasing interest in animal models of human nephropathies have led to a number of renal studies in nonhuman primates. In the current investigation, sequential detergent extraction of cellular elements was carried out on renal cortical tissue blocks from rhesus monkey in an effort to demonstrate clearly the morphological features of major basement membrane(More)
Current e-learning environments do not provide sufficient support for group collaboration. The absence of the visual identification of the users makes effective collaboration in e-learning very difficult. This paper argues that virtual worlds (VW) possess the necessary tools to foster effective group collaboration for e-learning initiatives. The use of(More)
The objective of this study was to examine the feasibility of using aerosolized fluorescent microspheres to examine particle distribution in the respiratory tract of birds following aerosol exposure. Adult domestic pigeons (Columbia livia domestica; n = 5 birds per microsphere size) were exposed to aerosolized monodispersed populations of various sized(More)