Metabolism of urea in Chlorella ellipsoidea
スポンサーリンク
概要
- 論文の詳細を見る
The effect of cyanide on ammonia and urea metabolism was studied with intact cells of Chlorella ellipsoidea Gerneck, a green alga which apparently lacks urease. Ammonia uptake was inhibited more readily by cyanide than was urea uptake. Urea uptake was stimulated by lower concentrations of cyanide. The addition of cyanide caused the formation of ammonia from some cellular nitrogenous compounds. In the presence of exogenously added urea, the molar ratio of ammonia accumulated in the medium to urea taken up exceeded 2.0 as the cyanide concentration increased. However, the molar ratio of ammonia actually produced from urea nitrogen to urea taken up was less than 1.35 at any concentration of cyanide tested. In the presence of higher concentrations of cyanide, the rate of incorporation of ^<15>N into amino acids from ^<15>N-urea, was higher than that from ^<15>N-ammonium sulfate. The results suggest that Chlorella ellipsoidea possesses a pathway through which urea nitrogen is assimilated directly without a preliminary breakdown to ammonia.
- 日本植物生理学会の論文
著者
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Hori Shiro
Department Of Applied Biology Radiation Center Of Osaka Prefecture
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Hori Shiro
Department Of Applied Biology
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Kitoh Shunji
Department of Applied Biology, Radiation Center of Osaka Prefecture
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Kitoh Shunji
Department Of Applied Biology Radiation Center Of Osaka Prefecture
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