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The Fate of Polar Bodies in the Egg of Urechis unicinctus
http://hdl.handle.net/10083/2015
http://hdl.handle.net/10083/2015851c3739-1f44-45e6-80bc-2d6f24b383a8
名前 / ファイル | ライセンス | アクション |
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KJ00004829378.pdf (1.2 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-04-30 | |||||
タイトル | ||||||
タイトル | The Fate of Polar Bodies in the Egg of Urechis unicinctus | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | departmental bulletin paper | |||||
著者 |
Takada, Chinami
× Takada, Chinami× Kume, Matazo× 高田, 千波× 久米, 又三 |
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著者(ヨミ) | ||||||
識別子 | 69142 | |||||
識別子Scheme | WEKO | |||||
姓名 | タカダ, チナミ | |||||
著者(ヨミ) | ||||||
識別子 | 69143 | |||||
識別子Scheme | WEKO | |||||
姓名 | クメ, マタゾウ | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 1. It is aimed in this paper to re-examine the fact about the polar bodies in the egg of Urechis that they are said to be enclosed within the blastocoele during early stages of development, and to find out futher, if possible, its probable causes. 2. The enclosure of the polar bodies within the blastocoele occurs at the stage of 16 cells. In most cases, only one polar body is enclosed, but, in quite rare cases, two are enclosed. Polar body or bodies thus enclosed can remain as such even until the stage of young trochophore. Since their detaching or dislocation occurs because of their connection with the egg surface by a stalk, the enclosure of polar bodies within the blastocoele indicates that the original egg surface does not necessary form the outer surface of the embryo of later stages, but, some part of it is involved in the formation of the inner surface of the wall of the blastocoele. 3. Occurrences of the regional shrinkage or the expansion on the surface of the dividing Urechis egg are conceivable from the observations on the behaviors of plasmic strands as well as polar bodies. Curves obtained by the measu\ rements of distance changes between two polar bodies show that the furrow region of the dividing Urechis egg has far higher expansive capacity when compared with that of the seaurchin. 4. The higher capacity of expansion in the furrow region and the less extent of flattening on the side of the blastomeres of the Urechis egg are suggested as probable causes for the enclosure of polar bodies within the blastocoele. |
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書誌情報 |
お茶の水女子大學自然科學報告 巻 5, 号 1, p. 145-152, 発行日 1954-08 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00298190 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00033958 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
形態 | ||||||
1236131 bytes | ||||||
日本十進分類法 | ||||||
主題Scheme | NDC | |||||
主題 | 400 | |||||
出版者 | ||||||
出版者 | お茶の水女子大学 | |||||
資源タイプ | ||||||
内容記述タイプ | Other | |||||
内容記述 | 紀要論文 | |||||
資源タイプ・ローカル | ||||||
紀要論文 | ||||||
資源タイプ・NII | ||||||
Departmental Bulletin Paper | ||||||
資源タイプ・DCMI | ||||||
text | ||||||
資源タイプ・ローカル表示コード | ||||||
03 | ||||||
所属 | ||||||
Zoological Laboratory, Ochanomizu University | ||||||
所属 | ||||||
Zoological Laboratory, Ochanomizu University |