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Effect of the composition of the growth medium on morphology and reproduction ofAzotobacter chroococcum

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Summary

The growth of threeAzotobacter chroococcum strains was investigated in a number of media. The cultures were incubated at 29°C. and studied by means of a Wild phase contrast microscope.

The experiments have clearly demonstrated that the morphology and reproduction ofA. chroococcum are influenced greatly on the one hand by conditions of nutrition and on the other hand also by the properties of the strains. Although all strains used in this work were able to produce gonidia and regenerative rods, these were not found in all media. The formation of filamentous cells, and vegetative cells inside such cells, depended also on the medium and, in some cases, on the strain.

Cysts could sometimes resist a temperature of 50°C. for 5.5 minutes, but not a single strain with cysts survived temperatures of 60°C. or higher.

Spores could not be detected by the usual staining methods.

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  1. Microbiological Laboratory of the IJssel-lake Polders Development and Colonization Authority, Directie van de Wieringermeer (IJsselmeerpolders), Kampen, the Netherlands

    D. A. van Schreven

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van Schreven, D.A. Effect of the composition of the growth medium on morphology and reproduction ofAzotobacter chroococcum . Antonie van Leeuwenhoek 28, 97–120 (1962). https://doi.org/10.1007/BF02538728

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  • DOI: https://doi.org/10.1007/BF02538728

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