Tomoko Yuasa

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Seven species of polycystine radiolarians and one phaeodarian species were investigated in order to determine the diversity of their associate organisms and their species specificity. Twelve partial 18S ribosomal DNA (rDNA) sequences were obtained showing a high diversity of associates, both within spumellarian and nassellarian radiolarians and among(More)
Cyanobacterial symbionts were detected in the extracytoplasm of the polycystine radiolarian Dictyocoryne profunda Ehrenberg. The bacterial symbionts were observed as numerous spherical bodies ~0.5–1.0 μm in diameter under transmission electron microscopy. They were present in a very restricted location close to the periphery of the host radiolarian shell,(More)
Although Escherichia coli LPS is known to elicit various proinflammatory responses in macrophages, its effect on the translational states of transcripts has not yet been explored on a genome-wide scale. To address this, we investigated the mRNA profiles in polysomal and free messenger ribonucleoprotein particle (mRNP) fractions of mouse macrophage-like(More)
We observed reproductive swarmer cells of the nassellarian and spumellarian polycystine radiolarians Didymocyrtis ceratospyris, Pterocanium praetextum, Tetrapyle sp., and Triastrum aurivillii using light, scanning and transmission electron microscopy. The swarmer cells had subspherical to ovoid or spindle shapes with two unequal flagella tapered to(More)
The symbiotic dinoflagellate Gymnoxanthella radiolariae T. Yuasa et T. Horiguchi gen. et sp. nov. isolated from polycystine radiolarians is described herein based on light, scanning and transmission electron microscopy as well as molecular phylogenetic analyses of SSU and LSU rDNA sequences. Motile cells of G. radiolariae were obtained in culture, and(More)
The mechanisms of the extensive distribution of radiolarian-affiliated sequences from clone libraries of marine picoeukaryotes from deeper water remain poorly understood. Here, we describe an event that could explain this phenomenon. A polycystine radiolarian species, Cypassis irregularis Nigrini, released a large number of pico-size cells under culture(More)
From Laboratory for Immunogenomics and Laboratory for Immunological Memory, RIKEN Research Center for Allergy and Immunology, Yokohama; and Laboratory of Genome Technology, Department of Human Gene Research, Kazusa DNA Research Institute, Chiba, Japan *Correspondence to: Hiroshi Kitamura, D.V.M., Ph.D. Laboratory for Immunogenomics RIKEN Research Center for(More)
Reproductive swarmers of the polycystine radiolarian Sphaerozoum punctatum (Huxley) collected from the East China Sea were examined using light, scanning and transmission electron microscopy. The swarmer cells were about 8-10 μm in length with a pear-like shape and a conical end with two flagella. A nucleus, mitochondria, Golgi body, lipid droplets and,(More)
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