Summary
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The cytoplasm of the radiolarian Aulacantha scolymantha contains numerous small rodlets of about 0.2 μ diameter whose fine structure is described in detail. They are formed within dilated lamellae of the Golgi systems and contain histochemically demonstrable polysaccharide. Evidence is presented to show that the rodlets contribute to the formation of the envelope of the central capsule.
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A striking relationship exists between the nuclear cycle and the appearance and disappearance of large concentric lamellar systems in the cytoplasm. During resting stages, the cytoplasm contains numerous membrane-bounded and seemingly empty vacuoles, with relatively large interconnecting channels. With the onset of changes leading to the appearance of definite chromosomes, double membranes are formed by foldings of the single membrane bounding the vacuole. This leads eventually to large lamellar systems which reach the peak of their development simultaneously with the presence of condensed and visibly doubled chromosomes in the nucleus. Regression of the lamellar bodies is likewise coordinated with changes leading to the reappearance of resting nuclei.
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Ruthmann, A., Grell, K.G. Die Feinstruktur des intracapsulären Cytoplasmas bei dem Radiolar Aulacantha scolymantha . Zeitschrift für Zellforschung 63, 97–119 (1964). https://doi.org/10.1007/BF00338811
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DOI: https://doi.org/10.1007/BF00338811