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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 181 (1958), S. 1351-1351 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Wagner1 has suggested that the stimulus for elongation comes from the capsule and that it originates from the production of auxin during, or following, spore production. In January, plants of Pellia epiphylla, bearing 25 sporophytes with mature capsules but non-elongated setae, were placed in ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 1122-1122 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The above experiment was repeated, in a modified form, upon the secondary pulvinus of the leaf of Samanea, which has the same nyctinastic response as the primary pulvinus of Mimosa, that is, curving downwards in the evening towards the 'closed' position, and upwards in the early morning towards the ...
    Type of Medium: Electronic Resource
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  • 3
    facet.materialart.
    Unknown
    Mona, Jamacia : Periodicals Archive Online (PAO)
    Caribbean quarterly. 5:4 (1959:June) 245 
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 147 (1941), S. 675-675 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A PREVIOUS communication from one of us (G. B.1) referred to observations on the rate of evolution of respiratory carbon dioxide from leguminous root nodules still attached to the plant. Those observations have been extended and are being published elsewhere. A brief report is ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    International journal of biometeorology 12 (1968), S. 321-329 
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Es wurde eine Anzahl Experimente zur Prüfung der Veränderung der Atmung von verschiedenen Typen Pflanzenmaterial im künstlichen elektrostatischen Feld von 5–10 kv/m durchgeführt. Die Atmung wurde nach der Warburg-Methode und im Durchflussverfahren durch Infrarot-Gasanalyse gemessen. Wo das Pflanzenmaterial von einem flüssigen Medium umgeben war, nahm die Atmung erheblich zu. Die Beobachtungen lassen sich auf der Grundlage von elektrolytischen Dissociationseffekten im äusseren Milieu erklären. Ähnliche Wirkungen sollten auch bei Pflanzen unter natürlichen Bedingungen vorkommen. Ein sicherer elektrostatischer Einfluss auf die Atmung wurde auch in Abwesenheit eines umgebenden flüssigen Mediums gefunden. Dies könnte eine direkte Folge des vorhandenen elektrischen Feldes sein.Sowohl"Schönwetter" positive als auch "umgekehrte" negative Felder waren wirksam, wobei wahrscheinlich die negativen Felder eine stärkere Anregung der Atmung bewirken als die positiven.Die Atemgrösse wurde durch Feldumkehrungen wiederholt verändert.Es ist deshalb unwahrscheinlich, dass die Beobachtungen allein Folge von gasförmigen Nebenprodukten bei der elektrischen Entladung waren.
    Abstract: Resume On a effectué diverses expériences afin de déterminer dans quelle mesure la respiration des plantes est affectée par leur exposition à des champs électrostatiques artificiels de l'ordre de 5 à 10 kv/m.La respiration a été mesurée à la fois par une méthode manométrique à volume constant et par l'analyse continue des gaz par rayons infra-rouges. Là où les plantes étaient en contact avec du liquide, on a pu constater une augmentation notable de la consommation en oxygène.Cela peut s'expliquer par des effets de dissociation électrolytiques dans le médium ambiant.On s'attendait à retrouver des effets similaires chez des plantes croissant dans leur milieu naturel. Une influence électrostatique certaine a également été retrouvée sur la respiration des tissus végétaux même en l'absence de milieu liquide ambiant. Il s'agit donc bien d'une réponse directe à la présence du champ électrique.Aussi bien les champs positifs (de beau temps) que négatifs (inversés)sont actifs bien que les seconds ont peut-être une plus forte tendance à activer la respiration que les premiers. La respiration a été modifiée plusieurs fois par des changements répétés de la polarité du champ. Il est donc peu probable que les effets constatés soient dûs uniquement à des produits secondaires gazeux provenant de décharges électriques.
    Notes: Abstract A series of experiments was carried out to test for alterations in the respiration of various types of plant material on exposure to artificial electrostatic fields in the range 5–10 kv/m.Respiration was measured both by constant volume manometry and by continuous flow Infra-Red gas analysis. Under conditions where the plant material was in contact with a liquid medium,considerable increases in 02 uptake were noted. These observations could be explained on the basis of electrolytic dissociation effects in the external medium; similar effects would be expected to occur in plants growing under natural conditions.A definite electrostatic influence on respiration was also observed, however, in the absence of any external liquid medium; this may be a direct response to the presence of the electric field. Both "fine weather" positive and "reversed" negative fields were effective, the negative fields having perhaps a greater tendency to stimulate respiration than the positive. Field reversals frequently altered the rate of respiration and it is therefore unlikely that the observations were due solely to the action of gaseous by-products of the electric discharge.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Planta 51 (1958), S. 757-769 
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Planta 51 (1958), S. 770-785 
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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