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Owing to the capacity of cyanobacteria to adapt physiologically to alterations of the environmental phosphate concentration, the phosphate uptake system exhibits complex bioenergetic properties under phosphate deficient growth conditions. Physiological adaptation to changes in the external phosphate concentration affects two energy dependent processes, namely the transport of phosphate through the...
When phytoplankton growth in lakes is limited by the available phosphate, the external phosphate concentration fluctuates around a threshold value at which available energy is insufficient to drive phosphate incorporation into a polyphosphate pool. As a result, occasional increases in the external concentration are experienced by phytoplankton as a series of phosphate pulses. Based on [32P] phosphate...
We present a model of microbial information processing that contains characteristic features of the phenomenon of physiological adaptation. The backbone of the model is the “adaptive event” in which energy-converting subsystems of the cell interact with the changing environment. In this process, the subsystems pass, via an adaptive operation mode, from one adapted state to the next. An adaptive operation...
Abstract. The phosphate-uptake behaviour of a sphX mutant of the cyanobacterium Synechococcus leopoliensis (Raciborski) Komarek, strain PCC 7942 has been studied. This mutant lacks the high-affinity phosphate-binding protein that is abundantly expressed under phosphate-deficient growth conditions. The following observations have been made: (i) The mutant is still capable of utilizing phosphate at...
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