Zellphysiologische Beobachtungen anIris Reichenbachii während des Abblühens

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Zum Mechanismus der stoffwechselbedingten Vakuolenfluorochromierung mit Uranin

Zusammenfassung Es wird chromatographisch und spektrometrisch gezeigt, daß der Farbstoff Fluoreszein bei der Umlagerung vom Protoplasma zur Vakuole eine chemische Änderung erfährt. Diese dürfte mit großer Wahrscheinlichkeit eine Veresterung mit Essigsäure sein. Es wird vermutet, daß dieser Ester durch Reaktion von Fluoreszein mit Acetyl-Coenzym A entsteht.

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On the mechanism of the metabolically dependant uraninfluorochroming of vacuoles

Summary It is proofed by chromatographic and spectrometric observations, that the dyestuff fluorescein is chemically changed during the translocation from protoplasma to the vacuole. One may assume, that an esterification with acetic acid takes place. The fluorescein is supposed to be esterfied by the action of acetyl-coenzyme A.

     

Mikrurgische Studien anDelphinium-Anthocyanophoren

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Dissident remarks on the origin of optical activity an intrabiological explanation

The attempts to explain the origin of natural optical activity through external, extrabiological, agents, typically ionizing rays, i.e. as a purely incidental effect without deeper significance, have failed and should be abandoned. An alternative, intrabiological, Darwinian, explanation seeks to explain optical activity as a necessary phenomenon in early evolution. This explanation is based on the idea that organisms with the existing stereospecificity initially happened, by chance, to be more efficient than organisms with the opposite stereospecificity on independent grounds that have nothing to do with their stereospecifity. If cells based on L aminoacids are called L cells, it is to be assumed that cosmic bodies carrying L cells are about equally frequent as those carrying D cells.Dedicated to the fine physicochemist Josef Schurz, Graz, Austria, on his 50th birthday.     

Zellphysiologische Untersuchungen über den Abblühvorgang beiIris undGladiolus

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