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Organic Synthesis In Algal Cells Separated Into Age Groups By Fractional Centrifugation

, : Organic Synthesis In Algal Cells Separated Into Age Groups By Fractional Centrifugation. Archiv für Mikrobiologie 49: 193-208

Synthesis of organic matter was studied in cells of the green, high-temperature alga Chlorella 7-11-05 separated from a nonsynchronized population into fractions of predominantly small or large cells by centrifugation. Rates of synthetic activity were determined as changes in optical density, dry weight, and packed volume of cells in several suspending fluids and under various light intensity conditions. Synthetic activity of the smaller (younger) cell fraction was invariably higher than that of the larger (older) cell fraction. An occasional lack of difference in the performance of the small- and large-cell fractions, or even a higher synthetic activity of the originally large-cell fraction, was traced to cell division. Under conditions favorable to cell division, the large-cell fraction was progressively enriched with smaller (younger) cells, and the metabolic activity of the large-cell fraction increased to the extent that, in some experiments, it surpassed that of the originally small-cell fraction. The decline in synthetic activity of cells in the course of cell development previously observed on synchronized cells was substantiated in nonsynchronized populations in the absence of the lightdark synchronizing agent is, therefore, characteristic of normal cell development.


PMID: 14306558

DOI: 10.1007/bf00422143

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