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  • 1970-1974  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Axial Elements in Plant Meiotic Chromosomes (1970)
    [s.l.] : Nature Publishing Group
    Nature 228 (1970), S. 79-80 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Anthers of the diploid lily (variety Enchantment Orange) were fixed with glutaraldehyde followed by OsO4, essentially as described by Ledbetter and Porter4. Thin sections were cut on a Porter Blum microtome, stained with uranyl acetate and lead citrate and viewed with a Siemens Elmiskop I at 80 kV. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/228079a0
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  • 2
    Electronic Resource
    Electronic Resource
    Magnesium-iron compositional variance in hornblende pyroxene granulites (1970)
    Springer
    Contributions to mineralogy and petrology 29 (1970), S. 76-88 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Hornblende-orthopyroxene-calcic pyroxene-plagioclase (andesine-labradorite) — magnetite-ilmenite±quartz assemblages are evidently the most common granulite facies representatives of basic rocks throughout the world, and they must represent a variance of more than one. Ramberg (1948) invoked an additional degree of freedom arising out of unequal fractionation of Mg and Fe in the ferromagnesian silicates in such rocks. This is examined in detail on the basis of chemical data on twentytwo hornblende-orthopyroxenecalcic pyroxene triads, half of them from the type charnockite area near Madras. Theoretical consideration of a magnesium-iron distribution model shows that in quartz-bearing hornblende pyroxene granulites, the Mg/Mg+Fe ratios of hornblende, orthopyroxene and calcic pyroxene are uniquely determined by temperature at constant pressure. But these assemblages contain quartz rarely and Mg-Fe distribution among the three can be best described by three exchange equilibria where, at constant temperature, there is a fixed relation between the Mg/Mg+Fe ratios of the minerals. Among these, the exchange equilibria between hornblende-orthopyroxene and hornblende-calcic pyroxene appear to be interdependent; however, they are known to be significantly modified by varying tetrahedral aluminium contents of hornblendes. Comparison of molecular Mg/(Mg+Fe) ratios of hornblendes and parent rocks strongly points to an absence of Mg-Fe compositional variance in the “total” system, a petrologically important corollary being that the hornblendes in these rocks are highly unlikely to be secondary after pyroxenes. The general variance of the assemblages is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388000
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  • 3
    Electronic Resource
    Electronic Resource
    Compositional relations among hornblende and pyroxenes in basic granulites and an application to the origin of garnets (1973)
    Springer
    Contributions to mineralogy and petrology 38 (1973), S. 299-306 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Three new sets of mineral and rock chemical data on basic granulites confirm the trends in compositional relationships, with respect to magnesium and iron, among hornblende, orthopyroxene and calcic pyroxene advanced by Sen (1970) and Ray and Sen (1970). Analysing the interrelationships among magnesium-iron distribution coefficients between hornblende-orthopyroxene and hornblende-calcic pyroxene, tetrahedral aluminium contents of hornblendes, and temperature of equilibration, it can be shown that equilibrium temperatures are higher with the Mg/(Mg+Fe) ratios of hornblendes increasing. An application of these relations to ferromagnesian phases of some garnet-bearing basic granulites points to formation of garnets in response to decreasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373595
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  • 4
    Electronic Resource
    Electronic Resource
    Origin of garnet in the basic granulites around Saltora, W. Bengal, India (1974)
    Springer
    Contributions to mineralogy and petrology 44 (1974), S. 195-218 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Garnetiferous basic granulites occur, as parts of hornblende-pyroxene- and pyroxene granulites, in a Precambrian terrain around Saltora. The chemistry of the garnetiferous basic granulites is broadly similar to that of the hornblende-pyroxene granulites, their immediate precursors, but in detail they have distinctly higher Fe/Mg ratios. The compositions of the major mafic silicates of the garnetiferous varieties do not reflect higher pressures of formation: the Jd/Ts ratios in calcic pyroxenes are similar to those from the non-garnetiferous varieties, and the pyrope contents of garnets are low. Exchange equilibrium in respect of major elements was established among the mafic silicates in spite of garnets being late overprints. The orthopyroxene — calcic pyroxene pairs from the garnetiferous granulites show lower values of K D(Mg-Fe) opx-cpx than those from the non-garnetiferous granulites, pointing to lower temperature of equilibration. The K D(Mg-Fe) opx-hbl K D(Mg-Fe) cpx-hbl relations show that the more magnesian triads equilibrated at lower temperatures; viewed against experimental data regarding the effect of Mg/Fe ratios on the appearance of garnets in basic rocks, formation of garnets by cooling is strongly indicated. Several intergrowth textures, especially garnet-ilmenite and garnet-quartz (±albite) symplectites, and modal relations argue in favour of composite reactions of the type hornblende+ quartz-→calcic pyroxene+garnet+albite+H2O, which couple hornblende breakdown reactions with orthopyroxene+anorthite→garnet reactions. The approximate range of pressure and temperature conditions, estimated from experimental data, are 6–8.5 kb and 750–830° C. Since garnets formed by cooling in iron-rich granulites, the garnetiferous granulites do not represent higher pressure subfacies of the granulite facies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413166
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  • 5
    Electronic Resource
    Electronic Resource
    Compositional relations among hornblende and pyroxenes in basic granulites and an application to the origin of garnets (1973)
    Springer
    Contributions to mineralogy and petrology 40 (1973), S. 86-86 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371768
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  • 6
    Electronic Resource
    Electronic Resource
    Phase relations in three charnockites from Pallavaram-Tambaram (1970)
    Springer
    Contributions to mineralogy and petrology 27 (1970), S. 239-243 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Chemical data on eight ferromagnesian silicates from a syenitic and two tonalitic charnockites from the type area near Madras show remarkably regular cation fractionation patterns. The distribution coefficients for magnesium-iron point to equilibration under granulite facies metamorphism. Orthopyroxene-garnet-biotite subsystem has been found to be of a near invariant nature, while the compositions of orthopyroxene and biotite in the nongarnetiferous tonalite are different. Analysis of phase equilibrium by Thompson type AFM projection strongly indicates that pressure, temperature and the chemical potential of water were constant for assemblages separated by large distances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385780
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  • 7
    Electronic Resource
    Electronic Resource
    Synaptonemal complexes in haploidPetunia andantirrhinum sp. (1970)
    Springer
    Naturwissenschaften 57 (1970), S. 550-550 
    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/BF00625339
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  • 8
    Electronic Resource
    Electronic Resource
    Absorption and emission spectra of thallium activated Na2O-NaCl-B2O3 and K2O-KCl-B2O3 glasses (1974)
    Springer
    Journal of materials science 9 (1974), S. 1493-1498 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Absorption and emission spectra of two Na2O-NaCl-B2O3 and two K2O-KCl-B2O3 glasses, with large thallium concentrations (about 0.01 mol thallium per litre glass) have been studied. Absorption bands have been observed at 49 000, 44 500 and 40 000 cm−1 for the Na2O-NaCl-B2O3 glasses, and at 49 000, 43 500 and 38 500 cm−1 for the K2O-KCl-B2O3 glasses at 300 K. Emission spectra have been recorded at 83, 308, 445 and 485 K; generally two emission bands have been observed in the ultraviolet region, and the intensity of both bands increased with decreasing temperature. The absorption and emission bands have been assigned to electronic transitions in different centres formed by Tl+ ions in glass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552935
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  • 9
    Electronic Resource
    Electronic Resource
    Absorption and emission spectra of Tl1+ with mixture of oxide and chloride ligands in glasses (1973)
    Springer
    Journal of materials science 8 (1973), S. 1110-1114 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Absorption and emission spectra of Tl1+ in a series of (16−x)R2O, 2x RCl, 84B2O3 glasses (where R refers to Na or K, andx varies from 0 to 4 mole) have been studied; and the results compared with those of Tl1+ in exclusively oxide and exclusively chloride co-ordinated polyhedra in crystalline phosphors. Both absorption and emission spectra of Tl1+ in chloride containing glasses gave strong evidence for complexes of the type: [Tl(oxide)6−n (chloride) n ] m−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00632761
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation of some nickel(II) and copper(II) complexes of the SCHIFF-Base derived from Acetophenone and Ethylenediamine (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 389 (1972), S. 215-219 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wird über Herstellung und Eigenschaften von NiII- und CuII-Komplexen mit der SCHIFFschen Base „BAPE“ aus Acetophenon und Äthylendiamin sowie über gemischte BAPE/Acetylaceton-Komplexe berichtet (Formeln I-V s. Abstract). BAPE wirkt dabei als zweizähniger Neutralligand. Die Komplexe wurden durch Elementaranalyse, Elektronenspektrum sowie durch magnetische und Leitfähigkeitsmessungen charakterisiert. Für MII(BAPE)Cl2 wird pseudotetraedrische, für [MII(BAPE)(acac)(H2O)2] ClO4 tetragonale Struktur abgeleitet (MII = Ni, Cu). Der Komplex [Ni(BAPE)(acac)]ClO4 erwies sich als quadratisch-planar.
    Notes: Preparation and properties of the following NiII and CuII complexes of the Schiff base derived from acetophenone and ethylenediamine (BAPE) and also of the mixed NiII and CuII chelates with BAPE and acetylacetone (acac-H) are described: In each case the Schiff base, BAPE, acts as a neutral bidentate ligand. The complexes are characterised by electronic spectra, magnetic susceptibilities, conductivities and elemental analyses. Pseudotetrahedral structure is proposed for M(BAPE)C12, while tetragonal structure for [M(BAPE)(acac)(H2O)2]ClO4 (M = Ni and Cu). The complex [Ni(BAPE) (acac)]ClO4 has been found to be square planar.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19723890213
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