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  • Articles: DFG German National Licenses  (9)
  • 1980-1984  (9)
Source
  • Articles: DFG German National Licenses  (9)
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Analysis of morphogenetic mutants of hydra (1981)
    Springer
    Development genes and evolution 190 (1981), S. 191-196 
    Details
    ISSN: 1432-041X
    Keywords: Morphogenetic mutants ; Hydra ; Head regeneration ; Morphogens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mutantreg-16 is deficient in head regeneration and abnormal in size regulation. The gastric region becomes twice as long as that of normal animals before the first bud is produced. Both mutant characteristics are due to changes in head-specific morphogen concentrations.Reg-16 contains twice as much head inhibitor and only half as much head activator in its head as normal animals. This leads to a higher level of free head inhibitor in the whole animal resulting on one hand in a greater distance of buds from the head, and on the other hand in a total blockage of release of head activator and head inhibitor which would be necessary to initiate head regeneration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848302
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of the foot inhibitor from hydra (1980)
    Springer
    Development genes and evolution 188 (1980), S. 133-139 
    Details
    ISSN: 1432-041X
    Keywords: Hydra ; Morphogenetic substances ; Regeneration ; Pattern formation ; Sea anemones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A substance was isolated from crude extracts of hydra that inhibits foot regeneration. This substance, the foot inhibitor, has a molecular weight of ≦500 daltons. It is a hydrophilic molecule, slightly basic in character and it has no peptide bonds. The pruified substance acts specifically and at concentrations lower than 10−7 M. At this low concentration only foot and not head regeneration is inhibited. Hydra are sensitive to purified foot inhibitor between the second and eight hour after initiation of foot regeneration by cutting. In normal animals the foot inhibitor is most likely produced by nerve cells. A substance with similar biological and physico-chemical properties is found in other coelenterates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848805
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The head and the foot inhibitor from hydra are not dowex artefacts (1984)
    Springer
    Development genes and evolution 193 (1984), S. 117-118 
    Details
    ISSN: 1432-041X
    Keywords: Hydra ; Regeneration ; Head inhibitor ; Foot inhibitor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In a recent publication in this journal (Berking 1983) it was claimed (1) that the head inhibitor we isolated from hydra is a Dowex artefact, (2) that a separate foot inhibitor does not exist in hydra and (3) that the only inhibitor that has so far been isolated from hydra is one which inhibits head and foot regeneration equally well. These statements are incorrect and require a response. In the following, I would like to summarise our evidence that the inhibitors isolated from hydra, including Berking's inhibitor, have different specificities for head and foot regeneration. In addition, I would like to show that none of our substances are Dowex artefacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848640
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Conserved amino acid sequence of a neuropeptide, the head activator, from coelenterates to humans (1981)
    [s.l.] : Nature Publishing Group
    Nature 293 (1981), S. 579-580 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Head activator, as assayed by its biological effect on hydra, was found in brain and intestine of cow, pig, rat and human5'6. The hypothalamus of an adult rat contained 105 hydra equivalents, the intestine 10 times more. Cow and pig contained comparable amounts per animal. The best source was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/293579a0
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  • 5
    Electronic Resource
    Electronic Resource
    Epithelial cells in nerve-free hydra produce morphogenetic substances (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 589-591 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In a preliminary investigation we have shown that severely nerve-depleted hydra, which consist almost exclusively of epithelial cells, contain normal concentrations of morphogenetic substances7. To exclude the possibility that the few remaining nerve cells overproduce these substances, we have ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283589a0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Morphogene substanzen ausHydra (1981)
    Springer
    Naturwissenschaften 68 (1981), S. 252-256 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract We use hydra as a model system to understand how growth and differentiation and, as a consequence of this, pattern formation are controlled at the molecular level. We have found that four substances control head and foot formation in hydra: an activator and an inhibitor of head formation and an activator and an inhibitor of foot formation. The two activators are peptides with molecular weights around 1000 daltons, the inhibitors are smaller in molecular weight (〈500), have an overall positive charge and do not contain peptide bonds. In normal animals all four substances are present and most likely produced by nerve cells. We hope to understand how these substances act and interact to create the spatial and temporal pattern of growth and differentiation typical for hydra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01047327
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  • 7
    Electronic Resource
    Electronic Resource
    Edelmetall-Perowskite mit 5H-Struktur (1983)
    Springer
    Naturwissenschaften 70 (1983), S. 143-144 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401603
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Über Ruthenium-Perowskite vom Typ Ba2BRuO6 und Ba3BRu2O9 mit B = Indium, Rhodium (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 473 (1981), S. 178-188 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Ruthenium perovskites of type Ba2BRuO6 and Ba3BRu2O9 with B = Indium, RhodiumThe black perovskites Ba2InRu5+O6 and Ba3InRu2O9 (mean oxydation state of ruthenium: +4.5) adopt the hexagonal BaTiO3 structure and form a continuous series of mixed crystals. According to the intensity calculations and analysis of the vibrational spectroscopic data an ordered distribution between indium and ruthenium is present: 1:1 order in Ba2InRuO6 (space group P3m1 ≙ D3d3; R′ = 5.3%); 1:2 order in Ba3InRu2O9 (space group P63/mmc ≙ D6h4; R′ = 4.6%).The corresponding black Rh compounds, Ba2RhRuO6 and Ba3RhRu2O9, crystallize in the rhombohedral 9 L type of BaRuO3.
    Notes: Die schwarzen Perowskite Ba2InRu5+O6 und Ba3InRu2O9 (mittlere Ru-Wertigkeit: +4,5) kristallisieren jeweils im hexagonalen BaTiO3-Typ und bilden eine lückenlose Mischkristallreihe. Nach Intensitätsberechnungen und Analyse der schwingungsspektroskopischen Daten liegt zwischen Indium und Ruthenium eine geordnete Verteilung vor: 1:1 Ordnung in Ba2InRuO6 (R.G. P3m1 ≙ D3d3; R′ = 5,3%); 1:2 Ordnung in Ba3InRu2O9 (R.G. P63/mmc ≙ D6h4; R′ = 4,6%).Die entsprechenden, ebenfalls schwarzen Rh-Verbindungen, Ba2RhRuO6 und Ba3RhRu2O9, kristallisieren im rhomboedrischen 9 L-Typ von BaRuO3.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814730220
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Über gemischtvalente Ruthenium-Perowskite Ba3B3+Ru24,5+O9 - zur katalytischen Aktivität von Sauerstoffperowskiten mit vier- und fünfwertigen Edelmetallen (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 481 (1981), S. 143-152 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Mixed Valent Perovskites Ba3B3+Ru24,5+O9 - Catalytic Activity of Perovskite Oxides with Noble MetalsThe black compounds Ba3B3+Ru2O9 crystallize with B3+ = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, and Y in a hexagonal BaTiO3 structure (6 L, sequence (hcc)2) with an ordered distribution (1:2 order) of B3+ and ruthenium (BO6 single octahedra; Ru2O9 double groups). The mean oxidation state of ruthenium is about +4.5. The properties are compared with that of other isotypic stacking polytypes Ba3B3+M24,5O9 (M2 = IrRu, Ir2, PtRu) and Ba3B2+M25+O9 (M = Ru, Ir).The results of activity tests concerning the efficiency of perovskite oxides with noble metals in respect of the oxidation of CO or CHx and the reduction of NOx are reported.
    Notes: Die schwarzen Verbindungen Ba3B3+Ru2O9 kristallisieren für B3+ = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, und Y in einer hexagonalen BaTiO3-Struktur (6 L; Sequenz (hcc)2) mit geordneter Verteilung (1:2 Ordnung) von B3+ und Ruthenium (BO6-Einzeloktaeder; Ru2O9-Doppelgruppen). Die mittlere Wertigkeit des Rutheniums liegt stets bei +4,5. Die Eigenschaften werden mit denjenigen anderer isotyper Stapelvarianten Ba3B3+M24,5+O9 (M2 = IrRu, Ir2 und PtRu) sowie Ba3B2+M25+O9 (M = Ru, Ir) verglichen.Die Ergebnisse von Aktivitäts-Tests über die Wirksamkeit von edelmetallhaltigen Sauerstoffperowskiten bei der Oxydation von CO bzw. CHx sowie der Reduktion von NOx werden mitgeteilt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814811016
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    Paper (German National Licenses)
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