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  • Digitale Medien  (4)
  • Inorganic Chemistry  (2)
  • Symbiosis  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Protoplasma 136 (1987), S. 104-117 
    ISSN: 1615-6102
    Schlagwort(e): Actinomycete ; Casuarina ; Development ; Frankia ; Root ; nodules ; Symbiosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary This is an ultrastructural study of development of infected cells in nitrogen fixing root nodules ofCasuarina spp. While several aspects of development are similar to those found in many other actinorhizae, unusual aspects of development of the host cell and differentiation of the endophyte inCasuarina are correlated with unusual changes in the wall of the infected cell. Instead of vesicles the endophyte forms atypical hyphae in mature infected cells. These unusual hyphal forms are termed intracellular hyphae. Intracellular hyphae are nonseptate hyphae which originate and terminate within the same host cell, and have a varying diameter and a multidirectional growth and branching pattern. A laminate surface layer previously undescribed on hyphae ofFrankia is a feature common to mostCasuarina endophytic hyphae and is probably similar chemically to the laminae comprising the multilamellate envelope of endophytic vesicles in other actinorhizae.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Protoplasma 183 (1994), S. 37-48 
    ISSN: 1615-6102
    Schlagwort(e): Actinomycete ; Frankia ; Procaryote cell wall ; Symbiosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Using tissue stained en bloc with chromic acid or tissue prepared by high pressure-freezing and freeze-substitution, it was possible to analyze quantitatively the ultrastructure of symbiotic vesicle envelopes (SVE) inAlnus serrulata, Ceanothus americanus, Elaeagnus umbellata, andMyrica cerifera. The lamina measured about 4.7 nm in thickness in thin section. Despite diverse symbiotic vesicle morphology, the SVE thickness was similar in all of these symbioses: 36–71 nm, which corresponded to 6–15 laminae based on counts of chromic acid-stained SVEs. This similarity in structure suggests that a similar environmental signal regulates envelope thickness in the different root nodules. Based on previous studies, this is likely to be pO2. Three types of envelope morphologies were distinguished: (1) theAlnus-type (as inAlnus andElaeagnus), which had localized thickenings around the vesicle and had thickest dimensions over the stalk; (2) theCeanothus-type. characterized as a relatively uniform envelope over both vesicle and attached hypha, and (3) theMyrica-type, which had no stalk region and a basal SVE thickness of about six laminae throughout except where localized thickening occurred. Localized thickening of the SVE resulted from extra numbers of laminae being deposited, generally over regions where septa contacted the edge of the vesicle. Freeze-substituted symbiotic vesicles had a variety of novel structures that are poorly preserved in chemically-fixed tissue. A paracrystalline body inAlnus symbiotic vesicles may be composed of particles that also exist free in the symbiotic vesicle cytoplasm. In addition, a previously unknown complex at the base of theAlnus-type symbiotic vesicle and within its stalk was evident in freeze-substituted tissues.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 189 (1930), S. 101-112 
    ISSN: 0863-1786
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 1. Es wird die Eignung der selenigen Säure für analytische Zwecke gezeigt und.
    Zusätzliches Material: 12 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Über die Bildung von [Na(POCl3)4]+-Komplexionen. Leitfähigkeits-, Raman- und NMR-Untersuchungen im System Phosphorylchlorid-Natriumtetrachloroaluminat bzw. analoger VerbindungenLeitfähigkeiten, Raman- sowie 27Al-, 23Na- und 31P-NMR-Spektren des Systems POCl3-NaAlCl4 wurden in Abhängigkeit vom Molenbruch x(NaAlCl4) im lösungsmittelreichen Gebiet gemessen. Zusätzlich erfolgte die Registrierung der Raman-Spektren der Lösungen von NaFeCl4, LiAlCl4, LiFeCl4 und KAlCl4 in POCl3. In den Li+- bzw. Na+-Ionen enthaltenden Proben konnte unter bestimmten Bedingungen ein von Temperatur und Salzkonzentration abhängiger Phasenübergang von der flüssigen in die feste Phase beobachtet werden. Deutliche Veränderungen in den Ramanspektren der Elektrolytlösungen im Vergleich zum reinen Lösungsmittel POCl3 belegen die Existenz von intermolekularen Wechselwirkungen, durch die das POCl3-Molekül beeinflußt wird. Die Annahme der Bildung von [M(POCl3)4]+-Solvaten (M = Li, Na) aufgrund der Ramanergebnisse wird durch die Resultate der NMR-Spektroskopie unterstützt.
    Notizen: The system POCl3-NaAlCl4 was investigated by measuring the conductivity and the Raman and NMR spectra (27Al, 23Na and 31P) as a function of the mol fraction x of NaAlCl4 in POCl3. Additionally, Raman spectra of POCl3 solutions of NaFeCl4, LiAlCl4, LiFeCl4, and KAlCl4 were recorded. In solutions containing Li+ or Na+ ions a liquid to solid (or jelly) phase transition was observed under certain conditions, dependent on salt concentration and temperature. Observed changes in the Raman spectra of the electrolyte solutions in comparison to the pure solvent POCl3 demonstrate the existence of interactions. Clearly, the POCl3 eigenfrequencies and hence the molecules are pertubed. The formation of [M(POCl3)4]+ complexes (M = Li, Na) can be deduced from the Raman measurements. NMR investigations support this conclusion. For assigning of Raman spectra, (Li+, K+) cation and ([FeCl4]-, [SbCl6]-) anion substitutions were employed.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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