卵殻の塩酸透過性

• 高見 丈夫

  農林省蚕糸試験場

• 野口 和子

  農林省蚕糸試験場

書誌事項

タイトル別名

• Permeability of hydrochloric acid to the egg shell in Bombyx mori
• (I) Differences in permeability due to silkworm varieties and parts of the shell
• I 品種及び卵殼の部分による透過性の差異

抄録

As the steps understanding real nature of the artificial-hatching of silkworm eggs induced by hydrochloric acid, we have many questions to be answered by experiments, and the most fundamental one among them is how the acid penetrate, passing through various layers, such as the egg shell, vitelline membrane and serosa, into the egg. In the present paper the authors describe their results of experiments on the permeability of the egg shell to hydrochloric acid (mixed with alcohol).<BR>Various parts of the shell were severed from eggs, and each of them was embedded in a block of chewing gum (polyvinyl acetate) to restrict penetration of the acid mixture through the shell piece but a small area where a tiny piece of pH testing paper was stuck on the inner surface. These blocks were then immersed into the acid mixture, and the time necessary for color change of the test paper was examined in that medium.<BR>The results obtained are as follows:<BR>1) The order of the different shell parts (see figures) in relation to decreasing permeability is the posterior (P), ventral (V), dorsal (D), lateral (S or U), and anterior (A), parts. This is exactly the same order reported by NIINOME in relation to their increasing thickness. The respiratory canals may have some relation through their sizes and distributions to the permeability.<BR>2) Considerable differences of the permeability were observed in different silkworm varieties.<BR>3) In some silkworm varieties an appreciable increase of the permeability can often be seen in the shell pieces treated with ether, suggesting that there may exist some ether soluble substances on or in the shell and they have possible effects upon the permeability.<BR>4) When intact silkworm eggs are examined in alcohol or liquid paraffin, the shell, at first, shows silvery appearance, then becoming transparent. This change in transparency probably has no or less direct relation to the permeability, but to the morphological nature of the outer-most layer of the shell.

収録刊行物

• 日本蚕糸学雑誌

  日本蚕糸学雑誌 24 (4), 253-258, 1955

  社団法人 日本蚕糸学会

詳細情報

• CRID: 1390282679509976704
• NII論文ID: 130004029297
• DOI: 10.11416/kontyushigen1930.24.253
• ISSN: 1884796X
• ISSN: 00372455
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可