Read e-book online Allgemeine Physiologie der Pflanzenzelle / General PDF

By H. J. Bogen (auth.), Dr. med. Günther F. Bahr, Dr. Hans J. Bogen, Dr. Leo Brauner, Professor Dr. Erwin Bünning, Professor Dr. T. Caspersson, Professor Dr. phil. Runar Collander, Dr. H. B. Currier, Professor Dr. Horst Drawert, Professor Dr. Franz Duspiva,

ISBN-10: 3642946763

ISBN-13: 9783642946769

ISBN-10: 3642946771

ISBN-13: 9783642946776

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Additional resources for Allgemeine Physiologie der Pflanzenzelle / General Physiology of the Plant Cell

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But often there is much justification for the assumption. Correlations with temperature, development, age, metabolism, and even psychological acti- The function of bioelectric currents. 15 vities, force one not only to recognize the reality of vital electric potentials, but also their possible association with outer environmental conditions and inner physiological activities. Among correlations which indicate that vital potentials are real and intimately associated with physiological activities are the following: oxygen causes an increase in the potential of frog's skin; exposure to a high frequency field stimulates the developing chicken egg and produces a noticeable increase in electric potential; irradiation of the frog's skin with X-rays increases potential differences; ultraviolet light raises the surface potential on chicken eggs; potential differences fall during asphyxia and drop to zero at death.

We have been so conditioned by years of biochemical kinetics, based on molecular reactions, that physical interpretations are frowned upon. We search for more enzymes, more chemical pathways, and forget entirely that the physical forces between and surrounding particles playa tremendous role in cellular kinetics. , nerve, are not characteristic of it alone. The action potentials so typical of the nerve fiber are found in muscle, and in plants such as Nitella and Mirrwsa (MOLIBOH 1929, DIANNELIDIB and UMRATH 1953), and will in all probability be found in a strand of primitive protoplasm such as that of a myxomycete, in spite of reports to the contrary (TAuo 1953).

In addition to the more obvious cutinized epidermal cells of the aerial plant parts and to the suberized cork cells, an important condition exists in the walls of leaf mesophyll. BANGHAM and LEWIS (1937) observed that the mesophyll walls in contact with the intercellular spaces in the leaves of Ficus elastica were not wet by water. On the other hand, non polar materials such as benzene, paraffin, and oils would spread on the surface of the walls. Since then other investigators have demonstrated the hydrophobic nature of the intercellular surfaces of mesophyll cells of other leaves (FREYWYSSLING and HiuSERMANN 1941, HiuSERMANN 1944, LEWIS 1945, 1948).

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Allgemeine Physiologie der Pflanzenzelle / General Physiology of the Plant Cell by H. J. Bogen (auth.), Dr. med. Günther F. Bahr, Dr. Hans J. Bogen, Dr. Leo Brauner, Professor Dr. Erwin Bünning, Professor Dr. T. Caspersson, Professor Dr. phil. Runar Collander, Dr. H. B. Currier, Professor Dr. Horst Drawert, Professor Dr. Franz Duspiva,


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