植物学雑誌
Online ISSN : 2185-3835
Print ISSN : 0006-808X
ISSN-L : 0006-808X
68 巻 , 799 号
選択された号の論文の4件中1~4を表示しています
  • 岡本 尚
    1955 年 68 巻 799 号 p. 1-13
    発行日: 1955年
    公開日: 2006/12/05
    ジャーナル フリー
    1. The distribution of electric potential on the surface of the seed embryo of Vigna sesquipedalis and its changes with the growth stage during 5 days were investigated, using a vacuum tube potentiometer and Zn/ZnSO4/agar non-polarizing electrodes.
    2. Influences of light and mechanical stimuli on the resting potential were also examined, and it was succeeded to exclude these disturbing influences practically by an appropriate device in the measurement.
    3. The internal structure of the plant and its changes with growth were explored from the histological aspect in relation to the potential distribution.
    4. Experimental results thus obtained indicate that the zonal distribution of the elongation velocity in the axial direction coincides neither with the potential distribution itself as has been hitherto accounted simply nor with that of potential gradient, but most sufficiently with that of the 2nd derivative of the potential, as theoretically warranted in the discussion.
    5. A working hypothesis with which these facts are to be explained was based upon an assumption that the distribution of resting potential on the surface of the plant body is determined by the spatial distribution of ionic concentration which ought to refer to the functional differentiation of the tissues concerned.
  • 山崎 敬
    1955 年 68 巻 799 号 p. 14-24
    発行日: 1955年
    公開日: 2006/12/05
    ジャーナル フリー
  • 岸本 卯一郎
    1955 年 68 巻 799 号 p. 25-29
    発行日: 1955年
    公開日: 2006/12/05
    ジャーナル フリー
    フラスモ (Nitella flexils) の節間細胞を用いて, 滲透現象に伴う原形質膜及び細胞液の電気抵抗の変化について調べた。この細胞を2つの部分に分ち, この間に蔗糖水 溶液で滲透勾配を与えると, 水は低滲透圧側より細胞に入り, 細胞内を通つて高滲透圧側へ移動する。これに伴つて, 細胞内ではイオン, 溶質が高滲透圧側へ運ばれる。このとき細胞液の電気抵抗は低滲透圧側では高く, 高滲透圧側では低くなり, 且つその変化は運ばれた溶質の量に比例している。原形質膜の抵抗も水の入る側では高くなり, 水の出る側では低くなるが, その変化の割合は滲透勾配の小さいときは小さいが, 滲透勾配が大きくなると非常に大きく変化する。細胞へ水が入るときには, 原形質膜に対して著しい影響はみられないが, 細胞より水が出てゆくときには多少ともイオンの leakage を伴い, この leakage の現象は細胞に対して有害に作用する。本研究を行うにあたって終始変らぬ指導と鞭撻を戴いた神谷宣郎教授に厚く御礼を申し上げる。
  • 鈴木 米三
    1955 年 68 巻 799 号 p. 30-33
    発行日: 1955年
    公開日: 2006/12/05
    ジャーナル フリー
    1. Aspartic acid was oxidized both anaerobically and aerobically by the resting cell of Bacillus pumilus.
    2. Cyanide inhibited the oxidation of aspartate aerobically but not anaerobically. This indicates that the observed inhibition is due to the reoxidation of the reduced enzyme by molecular oxygen but not to the reduction of the enzyme by its substrate.
    3. Mercuric chloride, monoiodoacetic acid, and ferricyanide inhibited the oxidation activity of bacteria these findings suggest that sulfhydryl group might be involved in the oxidation process.
    4. The sensitivity of the oxidation process to hydroxylamine, hydrazine and semicarbazide suggests that active carbonyl groups may also be present in the enzymes.
    5. From the reaction with pyrophosphate and ferrocyanide it might be concluded that Mg-ion is not essential in this oxidation process.
    6. The mechanism of the acceleration by arsenate and ferrocyanide is obscure.
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