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  • Key words: Aerenchyma  (2)
  • Mössbauer spectroscopy  (2)
  • Springer  (4)
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  • Springer  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Cellular dissection of the degradation pattern of cortical cell death during aerenchyma formation of rice roots (1998)
    Springer
    Planta 204 (1998), S. 277-287 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Aerenchyma ; Cell death ; Oryza ; Plasmodesma ; Root
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Cellular events which occur prior to cell collapse were examined in the root cortex of rice (Oryza sativa L.) during aerenchyma formation. Cell collapse started at a specific position in the mid cortex. These cells were distinct in shape from those located towards the periphery. Furthermore, cell collapse was preceded by acidification and the loss of plasma-membrane integrity in cells of the mid cortex. Subsequent death of neighboring cells followed a radial path. Microinjection of molecules of different sizes conjugated with fluorescein isothiocyanate (FITC) showed a molecular exclusion limit of between 9.3 and 19.6 kDa in the root cortex. Furthermore, large molecules, i.e. those around 9.3 kDa, were predominantly transferred in a radial direction, which coincided with the path of sequential cell death.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050257
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  • 2
    Electronic Resource
    Electronic Resource
    Cortical cell death, cell proliferation, macromolecular movements and rTip1 expression pattern in roots of rice (Oryza sativa L.) under NaCl stress (1999)
    Springer
    Planta 207 (1999), S. 354-361 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Aerenchyma ; Cell death ; Oryza ; Root ; Stress (NaCl)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The mode of action of NaCl in terms of cell proliferation and cell death was examined in seminal roots of rice plants (Oryza sativa L.). Salt/sodium chloride was inhibitory to cell number increase and to cell death in cortical tissue, whereas final cortical cell size was the same as in control roots that were not exposed to NaCl. It seems that NaCl may stimulate the transition phase from cell division to cell elongation. Further analysis of the role of NaCl in the suppression of cortical cell death was confined to a delay in the early stage of cell collapse, which was caused by tonoplast disruption, and plasma-membrane destruction. Sodium chloride did not have any effect on the cell-to-cell movement of macromolecules in the root cortex. In-situ hybridization studies indicated that expression of the gene for tonoplast intrinsic protein (rTip1) was localized predominantly in the epidermal and exodermal cells as well as in metaxylem cells in seminal roots. Upon NaCl treatment, the intensity of rTip1 gene expression was raised in the cortical parenchyma, suggesting that salt plays a role in the rapid onset of cell elongation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050492
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  • 3
    Electronic Resource
    Electronic Resource
    Characterisation of soil-oxide analogs by applied-field 57Fe Mössbauer spectroscopy (1998)
    Springer
    Hyperfine interactions 117 (1998), S. 245-270 
    Details
    ISSN: 1572-9540
    Keywords: Al-substituted iron oxides ; Mössbauer spectroscopy ; external fields
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this contribution, the effect of high external magnetic fields upon the Mössbauer spectra of aluminous α- and γ-Fe2O3, of aluminous α- and γ-FeOOH and of aluminous Fe3O4 is reviewed. It is shown that the shapes of these spectra are characteristic of these materials and also to some extent of their crystallinities and Al-for-Fe substitutions. Based upon this evaluation, the potential for application of external-field Mössbauer spectroscopy to soil-related analytical purposes is demonstrated for two soil samples. Limitations of the technique are discussed. Finally, some suggestions for further research in this field are indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012643326691
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of Al-content and crystallinity on the magnetic properties of goethites (1999)
    Springer
    Hyperfine interactions 122 (1999), S. 39-46 
    Details
    ISSN: 1572-9540
    Keywords: Al-goethites ; crystallinity ; magnetic properties ; Mössbauer spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reviews a profound Mössbauer study on the magnetic properties of goethites with varying crystallinity and Al-content. It has been found that both the cluster-ordering and the superferromagnetic models reproduce the temperature dependencies of the average hyperfine fields quite well. However, the magnetic transition temperatures predicted by the cluster-ordering model are in better agreement with those measured from thermoscan experiments. On the other hand, it has been found that the hyperfine field of maximum probability at low temperatures follows the spin–wave law for antiferromagnets. Linear relationships between the saturation hyperfine fields, the inter-sublattice exchange interactions, and the Néel temperatures to the Al-content and crystallinity could be derived. On the other hand, applied-field Mössbauer spectroscopy seems to suggest that the anisotropy field can differentiate between poor crystallinity and Al-content, and that a certain degree of ferrimagnetism occurs at higher Al-contents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012681219674
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