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  • Cell shaping  (2)
  • Voltage-dependent conductance  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Alamethicin pore formation: Voltage-dependent flip-flop of α-helix dipoles (1983)
    Springer
    European biophysics journal 9 (1983), S. 181-191 
    Details
    ISSN: 1432-1017
    Keywords: Alamethicin pore ; Voltage-dependent conductance ; α-helical structure ; Dipole moment ; Lipid bilayers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract The voltage-dependency of alamethicin pore formation is explained by a flip-flop gating mechanism of single alamethicin molecules. The energetically preferred aggregate structure is changed from antiparallel to parallel molecule orientation by membrane voltage application. The electrical field is sensed by the permanent dipole of the α-helical molecule part which spans the hydrophobic membrane core. Ion conducting pore and pore states result from electrostatic repulsion of a varying number of parallel dipoles which arrange circularly. This model is consistent with published data and with two additional experimental facts, that pore state distributions are ionic strength dependent and pore state conductances depend on ionic current direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00537815
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Melittin and a chemically modified trichotoxin form alamethicin-type multi-state pores
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 727 (1983), S. 108-114 
    Details
    ISSN: 0005-2736
    Keywords: Alamethicin ; Ion channel ; Lipid bilayer ; Melittin ; Pore formation ; Trichotoxin ; Voltage-dependent conductance
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(83)90374-7
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cell shaping and microtubules in developing mesophyll of wheat (Triticum aestivum L.) (1990)
    Springer
    Protoplasma 153 (1990), S. 141-148 
    Details
    ISSN: 1615-6102
    Keywords: Cell shaping ; Cell wall ; Immunofluorescence ; Mesophyll ; Microtubules ; Triticum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Differentiated mesophyll cells ofTriticum aestivum (cv. Star) exhibit a lobed outline resembling tube-shaped balloons with almost regularly spaced constrictions. It was shown that these constrictions are probably the result of hoops of wall reinforcements laid down during early stages of cell expansion. It appears that these hoops prevent expansion in the corresponding regions and thus give rise to the peculiar cell shape. The comparatively thin cell walls of the bulges are uniformly reinforced after the lobed shape is established. By using immunofluorescence techniques a change in the pattern of cortical microtubule arrangement was observed which corresponded to the pattern of cell wall deposition. Discrete bands of microtubules were found beneath the sites of hoop reinforcement. These bands disintegrated during late stages of cell expansion with microtubules fanning out into the almost empty regions of the bulges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01353998
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  • 4
    Electronic Resource
    Electronic Resource
    Microtubules and cell shaping in the mesophyll ofNigella damascena L. (1993)
    Springer
    Protoplasma 173 (1993), S. 8-12 
    Details
    ISSN: 1615-6102
    Keywords: Nigella damascena ; Mesophyll ; Arm-palisade ; Microtubules ; Wall deposition ; Cell shaping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cell shaping in the mesophyll ofNigella damascena was investigated with the aim of determining the origin of the arm-like protrusions, which are characteristic of, e.g., arm-palisade cells. It was found that hoops of cell wall were deposited during the early stages of cell expansion. The hoops were interconnected, thus embracing the cells with a wide-meshed net of local wall reinforcement. The pattern of wall deposition in the extra-cellular matrix correlated with a pattern of bands of microtubules in the cortical cytoplasm of the cells. During lateral expansion bulges were forced through the comparatively thin walls of spaces between the meshes, giving rise to the arm-like protrusions. After establishing the cell shape the bands of microtubules disintegrated and cell wall was uniformly deposited. The results are discussed in the context of the mode of cell shaping observed in the mesophyll of other systems and of a previous, classical hypothesis on the origin of arms in mesophyll cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378857
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    Paper (German National Licenses)
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