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  • 1
    Electronic Resource
    Electronic Resource
    The 3410 Å band of the PH molecule in the solar photospheric spectrum (1984)
    Springer
    Solar physics 90 (1984), S. 259-268 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Some weak unidentified solar photospheric lines in the wavelength range: (3400–3465) Å may be due to PH lines of the (0, 0) band of the PH(A 3 Π i - X 3 ∑-)system. These faint PH molecular lines have resulted an excitation temperature of the order of 4500 K. Using experimental lifetime data for PH in the A 3 Π i state, an absorption oscillator strength f 00 = 0.0075 is derived for the 3410 Å band of the PH (A 3 Π i - X 3 ∑-)system. Accurate line positions, oscillator strength and transition probability for the 4.4μ fundamental rotation-vibration band of the PH molecule are obtained. A comparison of positions of some lines of the 4.4μ band with those obtained on new tracings of high resolution solar spectra shows many coincidences with weak solar lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173954
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  • 2
    Electronic Resource
    Electronic Resource
    24MgH+ in the solar photospheric spectrum (1984)
    Springer
    Astrophysics and space science 102 (1984), S. 287-293 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The24MgH+ (A 1Σ+ −X 1Σ+) molecular lines have been identified in the photospheric spectrum. The rotational excitation temperature determined from the analysis of molecular line intensities of24MgH+ is found to be of the order of 4850 K which corresponds to the photospheric temperature of the Sun. The CNDO/2 dipole moments of24MgH+ for internuclear distance range: (1.3–2.1) Å in theX 1Σ+ state can be approximated byM(R)=4.92+1.33R. Estimations for the spontaneous emission Einstein coefficients (A v′ v″ ) and the absorption oscillator strengths (f v′ v″ ) for the (1, 0), (2, 0), and (2, 1) transitions in theX 1Σ+ state of the24MgH+ ion are also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650177
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Solvation of ions. Part XXIX. Ionic conductances in acetonitrile-water and pyridine-water mixtures (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 103-119 
    Details
    ISSN: 1572-8927
    Keywords: Conductance ; Walden product ; tetraphenylarsonium and tetraphenylboride ions ; pyridine-water and acetonitrile-water mixtures ; alkali metal salts ; copper salts ; ion-solvent interactions ; structural effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The limiting conductance of various salts of Na+, Ag+, Cu+, Cu2+ and Ph4As+ in acetonitrile-water (AN-H2O) and pyridine-water (Py−H2O) mixtures are reported. Single ion values are calculated for AN-H2O mixtures using the TATB assumption [λo(Ph 4 As +) = λo(Ph 4 B −)]. The trends observed for the limiting Walden products (λoη) of the electrolytes and individual ions are discussed in terms of specific ion-solvent interactions and the structural effects of the solvent mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646043
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  • 4
    Electronic Resource
    Electronic Resource
    Isolation and characterisation of nitrate reductase mutants and regulation of nitrate reductase and nitrogenase in the cyanobacterium Nostoc muscorum (1984)
    Springer
    Molecular genetics and genomics 195 (1984), S. 180-185 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Chlorate resistant mutants of the cyanobacterium Nostoc muscorum isolated after N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) mutagenesis were found to be defective/blocked in nitrate reductase (NR). The parent strain possessed active NR in the presence of nitrogen as nitrate and only basal levels of activity in ammonia and N-free grown cultures. Addition of ammonia suppressed the NR activity in the parent strain whereas addition of L-methionine DL-sulphoximine (MSX) restored NR activity. A similar repression by ammonia, glutamine and derepression with MSX were also observed for nitrogenase synthesis. One class of mutants lacked NR activity (nar -) whereas the specific activity of NR was low in another class of mutants (nar def). Unlike the parent, the mutants synthesized nitrogenase and differentiated heterocysts in the presence of nitrate nitrogen. Uptake studies of nitrite and ammonia in mutants revealed that they possessed both nitrite reductase and glutamine synthetases (GS) at low levels, and the same level respectively in comparison with the parent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332743
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    Paper (German National Licenses)
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