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- W2022140928 abstract "Under conditions of limited fixed-nitrogen, some filamentous cyanobacteria develop a regular pattern of heterocyst cells that fix nitrogen for the remaining vegetative cells. We examine three different heterocyst placement strategies by quantitatively modelling filament growth while varying both external fixed-nitrogen and leakage from the filament. We find that there is an optimum heterocyst frequency which maximizes the growth rate of the filament; the optimum frequency decreases as the external fixed-nitrogen concentration increases but increases as the leakage increases. In the presence of leakage, filaments implementing a local heterocyst placement strategy grow significantly faster than filaments implementing random heterocyst placement strategies. With no extracellular fixed-nitrogen, consistent with recent experimental studies of Anabaena sp. PCC 7120, the modelled heterocyst spacing distribution using our local heterocyst placement strategy is qualitatively similar to experimentally observed patterns. As external fixed-nitrogen is increased, the spacing distribution for our local placement strategy retains the same shape while the average spacing between heterocysts continuously increases." @default.
- W2022140928 created "2016-06-24" @default.
- W2022140928 creator A5048469544 @default.
- W2022140928 creator A5066857721 @default.
- W2022140928 date "2012-06-25" @default.
- W2022140928 modified "2023-10-16" @default.
- W2022140928 title "Heterocyst placement strategies to maximize the growth of cyanobacterial filaments" @default.
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- W2022140928 doi "https://doi.org/10.1088/1478-3975/9/4/046002" @default.
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