Einfluss des luftelektrischen Feldes auf das Haut-Potential vonRana esculenta

Summary The potential across the skin ofRana esculenta was remarkably reduced under Faraday conditions in comparison to animals kept under normal conditions. A pulsating electric field (10 Hz) practically abolished this effect.     

Zum Proliferations-Stoffwechsel der Rattenleber nach Teilhepatektomie. Autoradiographische Untersuchungen mit3H-Cytidin,-Phenylalanin und -Thymidin

Summary During the first wave of parenchymal liver regeneration in adult rats after partial hepatectomy, the cellular synthesis and migration of RNA and the metabolism of protein were studied by autoradiography following an injection of³H-cytidine or³H-l-phenylalanine and double injections of 1 of these precursors +³H-thymidine. The following results were obtained: the synthesis and migration of RNA and the metabolism of protein are enhanced under these conditions of proliferation. In spite of this, the relation of metabolic activity in nucleolus, karyoplasm and cytoplasm remains constant. By double injection techniques it is proved that no differences exist in migration of RNA into the cytoplasm and cytoplasmic protein synthesis between cells with or without DNA synthesizing nuclei.

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Mit Unterstützung der Deutschen Forschungsgemeinschaft.     

Praemia

Summary A new method is introduced permitting the registration of motor activity in insects, reptiles, birds and mammals. It allows the registration of extremely small amplitudes in body activity to be made. The method depends upon the influence of electrostatically-charged animal bodies on electric sounding devices or probes.     

Biophoton emission fromDaphnia magna: A possible factor in the self-regulation of swarming

Summary The formation of swarms by planktonic organisms was first described almost 100 years ago, but the mechanisms governing the development of patterns in population size and density are still not understood. In this study, we investigated one biophysical factor that may play an important role in swarm-formation. Spontaneous ultraweak photon emission in the visible range has been well documented for living cells, tissues and individuals in the plant and animal kingdom, including humans. We demonstrate here that the intensity of light emitted by the planktonic crustaceanDaphnia magna is a function of population density in relation to body size. The effects are discussed on the basis of the theory of Dicke^1,2, and it is suggested that biophoton emission may be a basic factor in the self-regulation of swarm density.