{"created":"2023-07-25T10:21:55.237201+00:00","id":1107,"links":{},"metadata":{"_buckets":{"deposit":"716f81ad-5b96-4a79-9ccf-8b1a74fedbd0"},"_deposit":{"created_by":3,"id":"1107","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"1107"},"status":"published"},"_oai":{"id":"oai:air.repo.nii.ac.jp:00001107","sets":["597:598:708:754"]},"author_link":["3810","3809","3813","3811","3812"],"item_10002_biblio_info_36":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1991-02-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"42","bibliographicPageEnd":"52","bibliographicPageStart":"37","bibliographic_titles":[{"bibliographic_title":"秋田大学教育学部研究紀要 自然科学"}]}]},"item_10002_description_29":{"attribute_name":"内容記述（抄録）","attribute_value_mlt":[{"subitem_description":"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.\nHitherto, Yamamoto carried out experiments to learn the mechanism of syngamy\n(Yamamoto, 1973). As a matter of fact, the course of the syngamy of both pronuclei\nis known to be different in the kind of species. In the case of the sea urchin, both\npronuclei directly fuse together before the initiation of nuclear division. However, in\nthe eggs of certain molluscs, it is known that the direct fusion of both pronuclei does\nnot occur prior to the formation of the mitotic spindle. In fact, the paternal and\nmaternal chromosomes become enclosed by common nuclear membranes in the nuclei of the two daughter cells (Balinsky, 1965).\nTo learn the mechanism of syngamy in the latter cases, first of all, the writers took\nup experiment to ascertain the normal development using some species of molluscs.\nIn spite of their expectation, as it was difficult to pursue a course of cell linage\nbecause of the opacity of the eggs used, they intended to review the early development\nand 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.\nImmediately after the shedding of the ovum, the unfertilized egg showed itself to\nbe polyhedral-shaped. Within 10 to 20 minutes after insemination, the breakdown of\nthe germinal vesicle took place followed by the maturation division. In the case of C.\ngigas, just prior to the first cleavage, conspicuous bulging of the cytoplasm appeared\nat the vegetal side of the egg. When the cleavage occurred, this protuberance was\nabsorbed into the one side of the daughter blastomere, and the egg was separated\ninto the daughter cells of an unequal size. Continually, the writer first concentrated\nto pursue the cell linage, then to analyze the course of morphogenesis in the larval\nstages of development.","subitem_description_type":"Other"}]},"item_10002_publisher_30":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"秋田大学教育学部"}]},"item_10002_source_id_27":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"03651649","subitem_source_identifier_type":"ISSN"}]},"item_10002_source_id_35":{"attribute_name":"NCID","attribute_value_mlt":[{"subitem_source_identifier":"AN00010282","subitem_source_identifier_type":"NCID"}]},"item_10002_version_type_37":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"YAMAMOTO, Masahiko"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"MIURA, Eiki"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"SAGA, Fusakazu"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"SUZUKI, Shigeru"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"山本, 穆彦","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-02-16"}],"displaytype":"detail","filename":"yamamoto7.pdf","filesize":[{"value":"1.5 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"yamamoto7.pdf","url":"https://air.repo.nii.ac.jp/record/1107/files/yamamoto7.pdf"},"version_id":"3aae1d8f-7514-4bf4-8e6a-b0e925d4b20f"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Pelecypoda","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Studies on the Normal Course of Development on Pelecypoda, Using Mainly the Eggs of C. gigas and C. chinensis","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Studies on the Normal Course of Development on Pelecypoda, Using Mainly the Eggs of C. gigas and C. chinensis"}]},"item_type_id":"10002","owner":"3","path":["754"],"pubdate":{"attribute_name":"公開日","attribute_value":"2008-07-18"},"publish_date":"2008-07-18","publish_status":"0","recid":"1107","relation_version_is_last":true,"title":["Studies on the Normal Course of Development on Pelecypoda, Using Mainly the Eggs of C. gigas and C. chinensis"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-07-25T11:57:38.650984+00:00"}