著者

平山 廉 薗田 哲平 酒井 佑輔 伊左治 鎭司 大倉 正敏

出版者

早稲田大学国際教養学部

雑誌

WASEDA GLOBAL FORUM (ISSN:13497766)

巻号頁・発行日

vol.16, pp.31-49, 2020-03

著者

大倉 正敏 増田 和彦

出版者

日本古生物学会

雑誌

化石 (ISSN:00229202)

巻号頁・発行日

vol.72, pp.17-20, 2002-09-20 (Released:2017-10-03)

参考文献数

17

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A spinal plate of the pectoral fin of placoderm was found from the Middle Devonian Nakazato Formation near Higuchi-zawa in Oofunato-shi in Iwate Prefecture, Japan. It is a dorsoventrally compressed element with jagged edges on its lateral margin. It is the second placoderm and it might be the first representative of arthrodiran placoderm from Japan.

著者

大倉 正敏

出版者

独立行政法人農業・食品産業技術総合研究機構

雑誌

若手研究(B)

巻号頁・発行日

2011

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豚レンサ球菌は豚やヒトに重篤な疾病を引き起こす重要な人獣共通感染症起因菌であり、莢膜多糖の抗原性の違いにより30以上の多様な血清型に分類されている。本研究では現在、血清型別に使用されている全35血清型参照株の莢膜多糖合成に関わる遺伝子群[Capsular polysaccharide synthesis(cps)gene cluster]について比較・解析を行った。その結果、本菌の血清型は「cps gene clusterの交換による大規模な変異」及び「cps gene cluster内の少数の遺伝子の塩基配列置換や欠失・挿入などによる小規模な変異」の両方により多様性を創造していることが示唆された。さらに、解析により明らかとなった、複数血清型共通遺伝子及び血清型特異的遺伝子を利用し、2回のマルチプレックスPCRにより分離株の血清型を推定する型別法を開発した。

著者

後藤 仁敏 大倉 正敏

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1998, 1998

著者

後藤 仁敏 大倉 正敏

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 (ISSN:13483935)

巻号頁・発行日

vol.1999, 1999

著者

後藤 仁敏 大倉 正敏 小川 浩

出版者

地学団体研究会

雑誌

地球科学 (ISSN:03666611)

巻号頁・発行日

vol.42, no.5, pp.290-297, 1988

被引用文献数

4

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Five specimens consisted of three genera and five species of chondrichthyes from the Middle Permian Akasaka Limestone in Kinshozan, Akasaka-cho, Ohgaki City, Gifu Prefecture, Central Japan are described. The fossil horizon is the uppermost part of the lower division (zone of Parafusulina). The chondrichthyan fossils were found in the pale orange and dark grey part of the grey-white massive limestone, and cotaining fossils such as Parafusurina japonica (Gumbel), Yatsengia ibukiensis Minato, Coelogasteroceras giganteum Nakazawa, ? Agathiceras sp. and crinoids. They are two teeth of cladodont sharks, Symmorium sp. and ? Symmorium sp., two dermal teeth of petrodi, Petrodus sp. and ? Petrodus sp., and one tooth plate of cochliodonts, Chochliodontidae gen. et sp. indet. Symmorium sp. is represented by a well preserved large cladodont type tooth. There are five cusps: a large central main cusp, mesial and distal side cusps and two small accesory cusps which are situated between main and side cusps. The main cusp is slightly inclined distally. There are many fine striae on the surface of the crown. The root of the tooth is composed of osseous tissues. ? Symmorium sp. is represented by a very small cladodont type tooth. The root and the mesial side cusp are not preserved. The cusps are straighter than the cusps of Symmorium sp. There are many fine striae on the surface of the crown. Petrodus sp. is a very large dermal tooth which is almost completely preserved. It is conical in shape. There are about thirteen radiating plicae and several circular growth lines on the surface of the crown. ? Petrodus sp. is one side of longitudinal section of the dermal tooth. It consists of two layers. The outer layer is thick and composed of white enameloid-like hard tissue which has many tubular structures. The inner layer is composed of black dense materials The tooth plate of cochliodonts, Chochliodontidae gen. et sp. indet., is observed from both sides in labio-lingual section. It is a large, curved, orally convex plate. There are five ridges on the occulusal surface of the tooth plate. The lingual ridge is largest and the other ridges become low and small towards labial side. It consists of three layers. The surface layer is thick and composed blue-grey enameloid-like hard tissue. The middle layer is composed of thin black substance. The basal layer is composed of dark grey hard tissue which is pale in some parts. This paper is the first report of cladodont type tooth of elasmobranchs, dermal tooth of petrodi and tooth plate of cochliodonts from the Japanese Permian. It can be expected that many kinds of fossil fishes will be found from the Paleozoic of Japan, in future.