Koichi Ikeda

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The aim of this study was to further clarify the relationship between emotional stress and bruxism. In experiment 1, 60 male 9-week-old Wistar rats were divided into four groups: the emotionally stressed (ES), the emotionally non-stressed (NS), the electrically foot-shocked (FSd), and the non-foot-shocked (NSd). ES rats were confined in a communication box(More)
In this paper, we present experimental results of frequency scaling and transducer optimization in internal dielectrically transduced silicon bar resonators. We show that selective positioning of the dielectric transducers inside the resonator can preferentially excite targeted harmonics while suppressing undesired modes. Furthermore, measurements across(More)
— This paper presents a study of mechanical coupling in 2D resonator arrays for filter applications. A robust coupling design for 2D array filters, comprised of weak coupling in one dimension and strong coupling in the second, is demonstrated experimentally and compared with weakly coupled and electrically summed 2D resonator array filters. Effects of(More)
We treated 64 hemodialysis patients with cerebral hemorrhage over an 18-year period between 1986 and 2003. Clinical features, prognostic factors, and therapeutic strategy were reviewed in these cases. Thirty of the cases were in the 13-year period between 1986 and 1998, and 34 cases, in the 5-year period between 1999 and 2003. In recent years, the incidence(More)
To reveal the accumulation profile of tetrodotoxin (TTX) in pufferfish Takifugu rubripes juveniles, we compared the localization of TTX in various tissues among wild juveniles and hatchery-reared juveniles with or without TTX administration using immunohistochemical technique with anti-TTX monoclonal antibody. Immuno-positive reaction was observed in(More)
Most animals advertise their unprofitability to potential predators via conspicuous signals. Whether the strength of this aposematic signal indicates the quality and quantity of chemical defenses in animals is controversial. Here, we investigated the relationship between the conspicuousness of an aposematic signal and toxicity, which likely depends, at(More)
Sika deer (Cervus nippon) cause serious damage to trees in Japanese forests. Browsing, bark stripping, and tree abrasion with antlers account for 50% of total wildlife damage over the past decade. The extent of forest damage depends on deer population density. We determined the spatial distribution of sika deer population density on Mt. Hiko (Fukuoka(More)
Mushroom bodies (MBs) in Protophormia terraenovae were ablated by hydroxyurea (HU) treatment to larvae just after hatching in order to examine roles of the MBs in olfactory learning and photoperiodism. In all individuals the structures of the alpha, beta, and gamma lobes, the pedunculi, and the calyces of the MB were not found after HU treatment. The other(More)
The purpose of the study is to elucidate the effects of a craniotomy on patients regarding the cytokines and immunological function. TNF-alpha, IL-6, the CD4/8 ratio, cortisol, and WBC were all measured perioperatively in 29 patients. No serum TNF-alpha was detectable in any patients. The IL-6 level, cortisol and neutrophils all showed an increase with a(More)
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