Summary
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1.
The effects of 8-azaguanine, a purine analogue, 2-thiouracil, a pyrimidine analogue and ethionine, an amino-acid analogue, on the various stages of cleavage ofPlanorbis exustus have been studied. The development of eggs was inhibited by these analogues.
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2.
The effects of these analogues are not reversible: The effects produced by 8-azaguanine, 2-thiouracil and ethionine were not prevented by guanosine, uracil and methionine.
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3.
Other effects of these analogues have been briefly, discussed and they were compared with those of other agents modifiying the development ofPlanorbis eggs.
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4.
It is suggested that these analogues bring about their effects by interfering with RNA and protein synthesis.
Zusammenfassung
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1.
Die Wirkungen von 8-Azaguanin, einem Purin-Analogen, 2-Thiouracil, einem Pyrimidin-Analogen, und Äthionin, einem Aminosäure-Analogen, auf verschiedene Furchungsstadien vonPlanorbis exustus wurden untersucht. Die Entwicklung der Eier wurde durch diese Analogen gehemmt.
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2.
Die Wirkungen dieser Analogen waren nicht reversibel: die Einflüsse von 8-Azaguanin, 2-Thiouracil und Äthionin wurden durch Guanosin, Uracil und Methionin nicht aufgehoben.
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3.
Andere Effekte dieser Analogen werden kurz diskutiert und mit denen anderer Agentien verglichen, die die Entwicklung der Planorbis-Eier beeinflussen.
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4.
Es wird angenommen, daß diese Analogen ihre Wirkungen durch die Beeinflussung der Ribonucleinsäure- und Proteinsynthese hervorbringen.
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Diwan, B.A. Effects of some analogues of purines, pyrimidines and ammo-acids on the early development ofPlanorbis exustus . W. Roux' Archiv f. Entwicklungsmechanik 160, 112–118 (1968). https://doi.org/10.1007/BF00573648
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DOI: https://doi.org/10.1007/BF00573648