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Studies on the Normal Course of Development on Pelecypoda, Using Mainly the Eggs of C. gigas and C. chinensis
http://hdl.handle.net/10295/982
http://hdl.handle.net/10295/98202c072db-3fec-464e-9836-410422897a78
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
yamamoto7.pdf (1.5 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||||
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| 公開日 | 2008-07-18 | |||||||||||||||
| タイトル | ||||||||||||||||
| タイトル | Studies on the Normal Course of Development on Pelecypoda, Using Mainly the Eggs of C. gigas and C. chinensis | |||||||||||||||
| 言語 | ||||||||||||||||
| 言語 | eng | |||||||||||||||
| 主題 | ||||||||||||||||
| 主題Scheme | Other | |||||||||||||||
| 主題 | Pelecypoda | |||||||||||||||
| 資源タイプ | ||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||||||
| 作成者 |
YAMAMOTO, Masahiko
× YAMAMOTO, Masahiko
× MIURA, Eiki
× SAGA, Fusakazu
× SUZUKI, Shigeru
× 山本, 穆彦
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| 内容記述 | ||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||
| 内容記述 | The echinoderm eggs have been a well known object for the analysis of development (Yamamoto, 1988). This may be based mainly on their moderate size and transparency of the ovum. Moreover, the most important fact is that the eggs can be artificially inseminated. Hitherto, Yamamoto carried out experiments to learn the mechanism of syngamy (Yamamoto, 1973). As a matter of fact, the course of the syngamy of both pronuclei is known to be different in the kind of species. In the case of the sea urchin, both pronuclei directly fuse together before the initiation of nuclear division. However, in the eggs of certain molluscs, it is known that the direct fusion of both pronuclei does not occur prior to the formation of the mitotic spindle. In fact, the paternal and maternal chromosomes become enclosed by common nuclear membranes in the nuclei of the two daughter cells (Balinsky, 1965). To learn the mechanism of syngamy in the latter cases, first of all, the writers took up experiment to ascertain the normal development using some species of molluscs. In spite of their expectation, as it was difficult to pursue a course of cell linage because of the opacity of the eggs used, they intended to review the early development and larval differentiation of the Pelecypoda. In the present report, the writers described the normal course of development using mainly the eggs of the oyster, Crassostrea gigas and the bivalve, Caecera chinensis. Immediately after the shedding of the ovum, the unfertilized egg showed itself to be polyhedral-shaped. Within 10 to 20 minutes after insemination, the breakdown of the germinal vesicle took place followed by the maturation division. In the case of C. gigas, just prior to the first cleavage, conspicuous bulging of the cytoplasm appeared at the vegetal side of the egg. When the cleavage occurred, this protuberance was absorbed into the one side of the daughter blastomere, and the egg was separated into the daughter cells of an unequal size. Continually, the writer first concentrated to pursue the cell linage, then to analyze the course of morphogenesis in the larval stages of development. |
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| 出版タイプ | ||||||||||||||||
| 出版タイプ | VoR | |||||||||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||||||||
| 書誌情報 |
秋田大学教育学部研究紀要 自然科学 号 42, p. 37-52, 発行日 1991-02-01 |
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| ISSN | ||||||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||||||
| 収録物識別子 | 03651649 | |||||||||||||||
| NCID | ||||||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||||||
| 収録物識別子 | AN00010282 | |||||||||||||||
| 出版者 | ||||||||||||||||
| 出版者 | 秋田大学教育学部 | |||||||||||||||
