期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1979
卷号：76
期号：7
页码：3184-3188
DOI：10.1073/pnas.76.7.3184
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The rate of uptake of putrescine by Anacystis nidulans has been shown to depend on the external pH and the extracellular concentration of putrescine. Accumulation of exogenous putrescine was also proportional to the concentration of putrescine in the medium, suggesting that putrescine uptake was not subject to cellular regulation. An equation was derived to test the hypothesis that putrescine accumulation was due to ion trapping. Comparison of the predicted and observed intracellular concentrations of putrescine under various conditions showed a close correlation in support of the hypothesis of ion trapping. Under conditions leading to cell death (e.g., 150 microM putrescine, pH 9.8), the correlation did not hold as a result of leakage of accumulated putrescine.
