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Many natural and technological applications generate time-ordered sequences of networks, defined over a fixed set of nodes; for example, time-stamped information about "who phoned who" or "who came into contact with who" arise naturally in studies of communication and the spread of disease. Concepts and algorithms for static networks do not immediately… (More)
The spiracular chambers of the three anterior pairs of spiracles are described, and their relationships with the air stores on the body are discussed. Morphological variations in the spiracular chambers of Ambrysus, Notonecta, and Hesperocorixa appear to be correlated with the manner in which these insects obtain atmospheric and dissolved oxygen.
The class III gene transcription factor termed TFIIIC has been extensively purified from Saccharomyces cerevisiae. Three polypeptides of 138, 131, and 95 kDa consistently copurified with TFIIIC transcription factor activity. These polypeptides were present in approximately equimolar quantities in all TFIIIC preparations. To determine which, if any, of these… (More)
The yeast gene encoding the 95-kDa subunit of the class III gene transcription factor TFIIIC was cloned. This gene, termed TFC1 (transcription factor C, gene 1), was isolated by screening a lambda gt11 yeast cDNA expression library using a polyclonal antiserum preparation which was previously shown to specifically recognize the 95-kDa subunit of yeast… (More)
We propose and analyse a class of evolving network models suitable for describing a dynamic topological structure. Applications include telecommunication, on-line social behaviour and information processing in neuroscience. We model the evolving network as a discrete time Markov chain, and study a very general framework where, conditioned on the current… (More)
Skeletal differences in the lateral thoracico-abdominal regions of fifth instar and adult Notonecta appear to reflect respiratory differences in the two stages. Changes in the epidermis of this region during the last instar are described, and the possible relationships between the epidermis, nymphal cuticle, and imaginal cuticle are discussed.