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The cytokinin content of root exudate of sunflowers increases during the exponential growth phase of the plants. The concentration of cytokinins drops, however, by a factor of ten when the plants have reached their final size. The reduced supply of cytokinins from the root to the shoot is regarded as one of the factors bringing about shoot senescence.
Symphytum officinale L cells were grown in Erlenmeyer flasks at four different temperatures: 15, 20, 25, and 30 degrees C. A mathematical model of the culture growth is presented. The intracellular and extracellular products are considered in separate equations. An interrelation between fresh weight, dry weight, and viability is considered in the balances.(More)
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