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  • 1975-1979  (3)
  • 1970-1974  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Growth Cycles in Lemna gibba Cultures and Their Effects on Growth Rate and Ultrastructure (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 46 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A long-established axenic culture of Lemna gibba G3 was maintained in exponential growth phase under controlled conditions. Weekly analyses for 2 years showed that the individual plants of the Lemna gibba clone fluctuated between two forms. One extreme consisted of plants light in weight, small in size, and with a high relative growth rate (RGR), the other of heavy, large, and more slowly growing plants. At intervals plants having intermediate characteristics dominated in the stock culture. Indication of an annual growth-cycle was also found.The magnitude of growth response (weight, RGR, area, and dry matter content) after treatment with abscisic acid (ABA), 6-benzylaminopurine (BAP), and a combination of the two was different for low-weight and heavy plants. The heavy plants were more sensitive to ABA and BAP treatment than the low-weight ones. The accumulation of starch was least in small untreated plants and greatest in ABA treated plants. Large electron transparent globules were found in the chloroplasts of the ABA treated plants and in heavy plants regardless of how they had been treated.The different physiological and ultrastructural characteristics of the two forms of Lemna plants probably reflect an ageing-rejuvenation cycle. Emphasis is placed on the importance of this cycle when Lemna is used as a model plant in physiological experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb03177.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of linear and volume analysis for the local-order parameters in two binary body-centred cubic alloys (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 31-36 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A procedure is presented for the separation of the local-order intensity scattered by a binary body-centred cubic alloy along three lines in reciprocal space. Linear Fourier coefficients are defined for the distribution of the local-order intensity along these lines and these are related to the Warren local-order coefficients, αi. The local-order coefficients have been obtained by this so-called linear analysis for Fe-3.9 at.% Mo and Fe-6.1 at.% Mo, and are compared with local-order coefficients derived by Fourier analysis of the local-order intensity in its minimum repeat volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871006198
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Clustering in Fe–3.9at.%Mo (1971)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 97-109 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The diffuse X-ray scattering from a single crystal of Fe-3.9 at. % Mo has been measured at room temperature. A volume in reciprocal space was explored, which was chosen so that the intensity due to local order could be separated from the effects of different atomic sizes of the species and first-order thermal diffuse scattering making use of the symmetry of these contributions according to a theory by Boric & Sparks. The Warren local order parameters have been derived and used in a computer program to generate the corresponding atomic distributions. The Mo atoms formed clusters on the average 7 to 8 Mo atoms in size, the clustered regions having about twice the Mo concentration as the average alloy composition. The largest clusters contained about 40 Mo atoms. The shapes of all these regions were irregular. An analysis of the scattering due solely to the differences in atomic size of Fe and Mo indicates that the Fe atoms are displaced from lattice points by about 0.001 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739471000226
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A study of the Cr-depleted surface layers formed on four Cr-Ni steels during oxidation in steam at 600° C and 800° C (1970)
    Springer
    Oxidation of metals 2 (1970), S. 401-417 
    Details
    ISSN: 1573-4889
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Three commercial steels with 18% Cr-11% Ni, 19% Cr-25% Ni, and 19% Cr-35% Ni and a laboratory-made 20% Cr-35% Ni steel have been oxidized in steam at 600°C and 800°C. Two types of oxides are distinguished: a thin layer rich in Cr2O3 and patches of thick oxide of Fe, Ni, Cr spinels. The Cr concentration profile in the steels under the first type has been determined by microprobe analysis of ground and pickled or annealed specimens oxidized for various times. The variation of the Cr concentration in the alloy at the alloy-oxide interface with surface treatment, time, and temperature is discussed. It is concluded that one reason for the more extensive nodular growth on pickled or annealed specimens is their greater Cr depletion after short time oxidation. The interdiffusion coefficients in the Cr-depleted zones have been determined on ground and annealed specimens oxidized at 800°C. The acceleration of the diffusion rate due to grinding is clearly demonstrated. A fair agreement with diffusion data from diffusion couples is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00604478
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic dipolar and electric quadrupolar effects on the Mössbauer spectra of magnetite above the Verwey transition (1977)
    Springer
    Hyperfine interactions 5 (1977), S. 201-214 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectroscopic studies (57Fe) of powdered magnetite have been undertaken between 120 K and 880 K. Below the magnetic transition temperature (T C=839.5 K) three six-line patterns have been fitted to our experimental spectra. The broadening of the B-pattern is explained by two magnetically non-equivalent B-site irons, suggesting broadening due to electron hopping to be negligible. In the paramagnetic state the electric quadrupole splittings of iron at A-and B-sites are found to be constant, independent of temperature, having the values zero and 0.16 mm/s, respectively. The centroid shifts, on the other hand, show above 700 K large deviations from the calculated second order Doppler shift. It is proposed that the deviations arise from a variation in band overlap. The temperature variation of the magnetic fields is found to be proportional to the sublattice magnetization. The difference in the magnetic fields at the two non-equivalent B-sites is measured to be 1.1 T at 310 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021693
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Clustering in Fe-Mo alloys (1970)
    Springer
    Journal of materials science 5 (1970), S. 901-908 
    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 A quantitative study was made of the diffuse scattering due to clustering at 550° C in an Fe-6.1 at. % Mo alloy. The intensity due to local order was separated from the effects of different atomic sizes of the species and first-order thermal diffuse scattering, making use of the symmetry of these contributions. The Warren local-order parameters have been derived and used in a computer program to generate the corresponding atomic distributions. Comparison of the atomic configurations for clustering in this alloy are made with those for our previous measurements on a more dilute alloy, Fe-3.9 at. % Mo at the same ageing temperature. In both alloys there are irregularly shaped Mo-rich clusters, but these are very dilute. For the smallest clusters there is some resemblance to the equilibrium precipitate Fe2Mo. This weak Mo concentration in these zones explains why previous investigators have found little hardening due to GP zones in this alloy. Also, the average displacement of Fe atoms from lattice sites is less in the alloy of 6.1 at. % Mo than in the more dilute alloy; this suggests there may be a relationship of these displacements to alloy-softening. The available Mössbauer spectra for this alloy are re-examined, and the suggested assignment of the Fe peaks to specific numbers of Mo neighbours in the first two shells is revised on the basis of the computer-generated atomic configurations; the third neighbour shell appears to be important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00574863
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Goldanskii-Karyagin effect in FePS3 (1979)
    Springer
    Hyperfine interactions 7 (1979), S. 229-239 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer studies have been performed on FePS3 in powder form between 125 K and 450 K. The Mössbauer spectrum consists of an asymmetric doublet, ratio∼0.93 at room temperature. The asymmetry is attributed to the Goldanskii-Karyagin effect and the lattice anisotropy is found to be ∼1.4, with the largest vibrations parallel to thec ⋆ axis of the monoclinic unit cell. The Debye temperature is ∼200 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021505
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    Paper (German National Licenses)
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