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        <identifier>oai:fra.repo.nii.ac.jp:02008923</identifier>
        <datestamp>2025-12-12T06:44:58Z</datestamp>
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        <jpcoar:jpcoar xmlns:datacite="https://schema.datacite.org/meta/kernel-4/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcndl="http://ndl.go.jp/dcndl/terms/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:jpcoar="https://github.com/JPCOAR/schema/blob/master/1.0/" xmlns:oaire="http://namespace.openaire.eu/schema/oaire/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rioxxterms="http://www.rioxx.net/schema/v2.0/rioxxterms/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="https://github.com/JPCOAR/schema/blob/master/1.0/" xsi:schemaLocation="https://github.com/JPCOAR/schema/blob/master/1.0/jpcoar_scm.xsd">
          <dc:title xml:lang="ja">真珠袋の組織学的研究　2. 季節による真珠袋形成速度の差異</dc:title>
          <dc:title xml:lang="en">Studies on the histology of the pearl-sac, II. On the speed ofthe pearl-sac formation different by season</dc:title>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="en">Machii, Akira</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="ja">町井, 昭</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="ja-Kana">マチイ, アキラ</jpcoar:creatorName>
            <jpcoar:familyName xml:lang="en">Machii</jpcoar:familyName>
            <jpcoar:familyName xml:lang="ja">町井</jpcoar:familyName>
            <jpcoar:familyName xml:lang="ja-Kana">マチイ</jpcoar:familyName>
            <jpcoar:givenName xml:lang="en">Akira</jpcoar:givenName>
            <jpcoar:givenName xml:lang="ja">昭</jpcoar:givenName>
            <jpcoar:givenName xml:lang="ja-Kana">アキラ</jpcoar:givenName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="en">Nakahara, Hiroshi</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="ja">中原, 晧</jpcoar:creatorName>
            <jpcoar:creatorName xml:lang="ja-Kana">ナカハラ, ヒロシ</jpcoar:creatorName>
            <jpcoar:familyName xml:lang="en">Nakahara</jpcoar:familyName>
            <jpcoar:familyName xml:lang="ja">中原</jpcoar:familyName>
            <jpcoar:familyName xml:lang="ja-Kana">ナカハラ</jpcoar:familyName>
            <jpcoar:givenName xml:lang="en">Hiroshi</jpcoar:givenName>
            <jpcoar:givenName xml:lang="ja">晧</jpcoar:givenName>
            <jpcoar:givenName xml:lang="ja-Kana">ヒロシ</jpcoar:givenName>
          </jpcoar:creator>
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          <datacite:description xml:lang="ja" descriptionType="Abstract">1) アコヤガイ（Pinctada martensii）の真珠袋形成速度並びに核面への沈着物がみられるに至る時期等について，４月から９月に至る各月に核入れ手術を行って観察した。

2) 真珠袋が形成されて核面に沈着物が認められるに至る間を継ぎの４期に分けて観察した（図５）。
　　第１期：ピースは大きな変化が認められない。
　　第２期：ピースの断面の概形はみかづき形を呈する。
　　第３期：真珠袋上皮細胞は完全に核を取りまく。
　　第４期：核面に沈着物がみられる。

3) 第３期に至るまでに要する日数は，４月（水温15.8℃）に手術した場合は早い個体で手術後７日，全個体が第３期に達するには，手術後17日，５月の場合は早い個体で５日，全個体がこの時期に達するには手術後21日，６月の場合は同じく５日及び21日，７月の場合は同じく５日及び12日，８月の場合は同じく３日及び12日，９月の場合は７日以上を要した。</datacite:description>
          <datacite:description xml:lang="en" descriptionType="Abstract">The speed in pearl-sac formation and the deposition of secretion product on the surface of the nucleus were histologically studied in the pearl oyster (Pinctada martensii). Four stages were described in the course of pearl-sac formation as follows :

　Stage 1. No particular change was found in the grafted mantle piece in this stage. 
　Stage 2. The grafted mantle piece transformed into a crescent shape after development. 
　Stage 3. The epithelial cells of the pearl-sac was found completely enclosed the nucleus. 
　Stage 4. The deposition of secretion product was observed in the nucleus. 

Evidence was presented that water temperature evidently influenced the speed in pearl-sac formation, as given in Tables 1 and 2. 
In April, seven days after operation were required for Stage 3 in the most speedy example, and 17 days in all specimens so far examined. In August, Stage 3 reached 3 days after operation in the most speedy sample and 12 days in all specimens under observation.</datacite:description>
          <dc:publisher xml:lang="ja">国立真珠研究所</dc:publisher>
          <dc:publisher xml:lang="en">National Pearl Research Laboratory</dc:publisher>
          <datacite:date dateType="Issued">1957-03-05</datacite:date>
          <dc:language>jpn</dc:language>
          <dc:type rdf:resource="http://purl.org/coar/resource_type/c_6501">departmental bulletin paper</dc:type>
          <jpcoar:identifier identifierType="URI">https://fra.repo.nii.ac.jp/records/2008923</jpcoar:identifier>
          <jpcoar:relation>
            <jpcoar:relatedIdentifier identifierType="Local">pearl_k_107</jpcoar:relatedIdentifier>
          </jpcoar:relation>
          <jpcoar:relation>
            <jpcoar:relatedIdentifier identifierType="URI">https://jp-pearl.com/wp-content/uploads/2018/04/houkoku002.pdf#008</jpcoar:relatedIdentifier>
            <jpcoar:relatedTitle xml:lang="ja">日本真珠振興会Archive</jpcoar:relatedTitle>
          </jpcoar:relation>
          <jpcoar:sourceIdentifier identifierType="NCID">AN00091717</jpcoar:sourceIdentifier>
          <jpcoar:sourceTitle xml:lang="ja">国立真珠研究所報告</jpcoar:sourceTitle>
          <jpcoar:sourceTitle xml:lang="en">Bulletin of the National Pearl Research Laboratory</jpcoar:sourceTitle>
          <jpcoar:volume>2</jpcoar:volume>
          <jpcoar:numPages>6</jpcoar:numPages>
          <jpcoar:pageStart>107</jpcoar:pageStart>
          <jpcoar:pageEnd>112</jpcoar:pageEnd>
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