Hannah M. Behrens

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Using a highly sensitive vibrating electrode, the pattern of naturally occurring electric currents around 1-day-old primary roots of Lepidium sativum L. growing vertically downward and the current pattern following gravistimulation of the root has been examined. A more or less symmetrical pattern of current was found around vertically oriented, downward(More)
Membrane potentials were measured in lateral statocytes of vertically and nonvertically growing roots of Lepidium sativum L. using conventional glass-microelectrode techniques. Statocytes in vertically growing roots showed a stable resting potential of-118±5.9 mV without spontaneous fluctuations. Upon tilting the root 45° from the vertical, an electrical(More)
Electrical transmembrane potential differences and resistances in different tissues of intact root tips of Lepidium sativum L. were investigated in a humid atmosphere by conventional glass-microelectrode techniques with the reference electrode at the surface (apoplast) of the root. The resting potential (inside negative) in cells of the root cap rose(More)
Botanisches Institut der Universitfit, D-5300 Bonn which is localized at the distal cell pole, and sedimentable amyloplasts functioning as statoliths are presumed to work as a gravity-sensing system (for a review see [31). The D1 spacelab experiment on graviperception offered the possibility of answering the following questions: How does a seedling develop(More)
D etailed investigation of the ultrastructure of biological samples like cells or organs by light and/or electron microscopy is an important first step in the acquisition of data in biological research. This is especially necessary if organisms have been grown and developed under completely new environmental conditions, as is the case under microgravity in(More)
Since gravistimulation is followed by alterations in the external current symmetry (Behrens et al., 1982), the effect of gravistimulation on cellular membrane potential was investigated using conventional glass microelectrode techniques. The resting potential of statocytes in a vertically oriented root is approx. -118 mV. Upon gravistimulation, the membrane(More)
The growing incidence of antibiotic-resistant Gram-negative bacterial infections poses a serious threat to public health. Molecules that have yet to be exploited as antibiotics are potent protein toxins called bacteriocins that are produced by Gram-negative bacteria during competition for ecological niches. This review discusses the state of the art(More)
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