Yutaka Kobayashi

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Bacteria of the genus Wolbachia are among the most common endosymbionts in the world. In many insect species these bacteria induce a sperm-egg incompatibility between the gametes of infected males and uninfected females, commonly called unidirectional cytoplasmic incompatibility (CI). It is generally believed that unidirectional CI cannot promote speciation(More)
This paper proposes and analyzes mathematically an interactive strategy to recover from misrecognition of utterances including multiple information items through a short conversation with a speaker. First the speech rec-ognizer in a dialogue system recognizes an utterance and evaluates the reliability of each item contained in it. The dialogue system(More)
INTRODUCTION The most common cause of central pontine myelinolysis is an overly rapid correction of hyponatremia, although it can also occur in patients with any condition leading to nutritional or electrolyte stress. We report a case of diffuse large B-cell lymphoma with central pontine myelinolysis developing at the onset of disease. To the best of our(More)
BACKGROUND Hemophilia A is an X-linked recessive disorder caused by a deficiency in factor VIII. Hemophilia A affects 1 in 5,000-10,000 males. Hematuria is frequent in hemophilia. Hematuria in hemophilia is generally considered benign and manageable with conservative therapy; however, severe hematuria requiring surgical therapy has rarely been reported. (More)
Genotypic fitness landscapes are constructed by assessing the fitness of all possible combinations of a given number of mutations. In the last years, several experimental fitness landscapes have been completely resolved. As fitness landscapes are high-dimensional, their characterization relies on simple measures of their structure, which can be used as(More)
Culture can grow cumulatively if socially learnt behaviors are improved by individual learning before being passed on to the next generation. Previous authors showed that this kind of learning strategy is unlikely to be evolutionarily stable in the presence of a trade-off between learning and reproduction. This is because culture is a public good that is(More)
Mast seeding is a reproductive mode in plants characterized by intermittence and intra- or interspecific synchronization. Several mechanisms have been proposed to explain the evolution of mast seeding, but the relative importance of each is still unclear due to the complex interactions among the various factors involved, i.e., the two components of masting(More)