Kikuo Iwabuchi

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Living muscle tissues and cells have been attracting attention as potential actuator candidates. In particular, insect dorsal vessel tissue (DVT) seems to be well suited for a bio-actuator since it is capable of contracting autonomously and the tissue itself and its cells are more environmentally robust under culturing conditions compared with mammalian(More)
A larval army caste is found in some parasitic wasps with polyembryonic or clonal proliferation, where many clone larvae emerge from a single egg. In contrast to non-parasitic eusocial Hymenoptera, sterile soldier larvae that protect their clonal reproductives are found in both females and males. Recently, the proportion of soldier larvae has been found to(More)
Tissue culture is performed to maintain isolated portions of multicellular organisms in an artificial milieu that is outside the individual organism and for considerable periods of time; cells derived from cultured explants are, in general, different from cells of the corresponding tissue in a living organism. The changes in cultured tissues that precede(More)
Males of the cerambycid beetle Xylotrechus pyrrhoderus release a mixture of (S)-2-hydroxy-3-octanone [(S)-1] and (2S,3S)-2,3-octanediol [(2S,3S)-2] as a sex pheromone that attracts conspecific females. The chemical structures of these pheromone components include a common motif and are assumed to be biosynthetically related. Here, we show that deuterated(More)
An insect dorsal vessel (DV) is well suited for a bioactuator since it is capable of contracting autonomously, and its tissue and cells are more environmentally robust under culturing conditions compared with mammalian tissue. In this study, electrical pulse stimulation was examined so as to regulate a bioactuator using the DV tissue. The DV tissue of a(More)
Cells must coordinate adjustments in genome expression to accommodate changes in their environment. We hypothesized that the amount of transcriptome change is proportional to the amount of environmental change. To capture the effects of environmental changes on the transcriptome, we compared transcriptome diversities (defined as the Shannon entropy of(More)
The queenless ant, Pristomyrmex punctatus (F. Smith) reproduces parthenogenetically. Workers lay unfertilized eggs, which develop into female workers. This mode of reproduction generates hereditary clones, though a colony is not necessarily constructed from single clonal line. In a previous study, where a colony was separated into two subcolonies, it was(More)
The cabbage white butterfly, Pieris rapae, produces pierisin-1, a protein inducing apoptosis of mammalian cells. In the present study, the biological activity of pierisin-1 as a protective agent against parasitic wasps for P. rapae was examined. Pierisin-1 caused detrimental effects on eggs and larvae of non-habitual parasitoids for P. rapae, Glyptapanteles(More)
Polyembryonic parasitoids clonally produce sterile soldier larvae in both sexes. Female soldier larvae of Copidosoma floridanum defend their siblings and host resources against heterospecific competitors as well as conspecific male embryos that results in female biased sex ratios. However, the male soldiers of the USA strain exhibit no aggressive behaviors(More)
Endoparasitoids have the ability to evade the cellular immune responses of a host and to create an environment suitable for survival of their progeny within a host. Generally, the host immune system is suppressed by endoparasitoids. However, polyembryonic endoparasitoids appear to invade their hosts using molecular mimicry rather than immune system(More)