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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 263 (1991), S. 253-263 
    ISSN: 1432-0878
    Keywords: Astrocytes ; Diencephalon ; Receptors, membrane ; Somatostatin (SRIF) ; Rat (Han: Wist)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using a somatostatin-gold conjugate of known biological activity, high affinity binding sites for this neuropeptide were visualized at cellular resolution on cultured diencephalic astrocytes and on frozen sections of the rat diencephalon. Binding could be completely suppressed in competition experiments with surplus unlabeled somatostatin. On sections, the ligand was displaced from its binding sites by 10 μM guanosine triphosphate indicating a functional significance of the labeled structures. As with the native peptide, a surplus of the analog SMS 201–995 suppressed nearly all staining. The ligand was bound to distinct populations of astrocytes, namely to those in subependymal and perivascular positions, to astrocytes in somatostatin-innervated hypothalamic nuclei in the mid-sagittal plane and to borderline regions of circumventricular organs. A general mismatch between the distribution of somatostatin-immunoreactive terminals and the pattern of binding of the ligand does not exist. This, together with the competition experiments, suggests a functional relationship between the somatostatin-releasing neurons and associated astrocytes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1024-1035 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Red Membrane Pigments of the Peat Moss Sphagunum rubellumThe red colour of the peat moss Sphagnum rubellum results from three membrane pigments, the sphagnorubins A, B, and C; they have been isolated and their structures elucidated. Sphagnorubin A (1) is identical with the formerly known sphagnorubin obtained from Sphagnum magellanicum. Sphagnorubin B (3) was identificated as 2-(3′,4′-dihydroxyphenyl)-8,9-dihydroxy-11-methoxyphenanthro[2,1-b]pyrylium chloride. Sphagnorubin C (7) is the 3′-methyl ether of sphagnorubin B.
    Notes: Die rote Pigmentierung des Torfmooses Sphagnum rubellum wird durch drei Membranochrome, die Sphagnorubine A, B und C, hervorgerufen; sie wurden isoliert und ihre Strukturen aufgeklärt. Das Sphagnorubin A (1) ist identisch mit dem aus Sphagnum magellanicum bekannten Sphagnorubin. Das Sphagnorubin B (3) wurde als 2-(3′,4′-Dihydroxyphenyl)-8,9-dihydroxy-11-methoxyphenanthro[2,1-b]pyryliumchlorid identifiziert. Das Sphagnorubin C (7) ist der 3′-Methylether des Sphagnorubin B.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 401-406 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A New Method for the Degradation of Anthocyanidins, Flavones, Chalcones, and CoumarinsAfter transformation into the corresponding chalcone or flavenol acetates anthocyanidins are oxidatively cleaved with ruthenium tetroxide to yield benzoic acid derivatives of the rings A and B. Flavones, chalcones, and coumarins are degradated by the same method.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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