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  • Articles  (187)
  • 1975-1979  (185)
  • 1940-1944  (2)
  • Physics  (187)
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  • Articles  (187)
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  • 11
    Electronic Resource
    Electronic Resource
    Lattice parameter determination of exsolution structures in labradorite feldspars (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 706-712 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Plagioclase feldspars with chemical formula Na0.5Ca0.5Al1.5Si2.5O8 for their bulk composition consist of lamellar structures on the 1000 Å scale at low temperatures. The lamellae have different compositions as a result of exsolution. In electron-diffraction patterns certain of the Kikuchi lines from these lamellae are doubled. These have been utilized for lattice-parameter determination by a method which is based on measurements of the differences in the orientation of the atomic planes in the lamellae. The factors determining the accuracy are discussed. For two specimens it is found that there is a difference of about 0.005 Å between the a axes and about 0.15° between the γ angles in the two lamellae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947700182X
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  • 12
    Electronic Resource
    Electronic Resource
    Temperature dependence of the Debye–Waller factor for magnesium measured by energy-dispersive diffractometry (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 482-484 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The Debye-Waller factor for powdered magnesium was measured in the temperature range 293 to 700 K by the energy-dispersive X-ray method. The results are compared with published theoretical calculations based on the quasi-harmonic and the anharmonic approximations. Anisotropy was found in the behaviour of the temperature factor B(T), with excellent agreement in the a axis direction between the experimental and theoretical calculations within the quasi-harmonic approximation. In the c axis direction, however, the experimental values at increasing temperature exceed the theoretical values, even in the anharmonic approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947900111X
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  • 13
    Electronic Resource
    Electronic Resource
    Lattice parameter determination using Kikuchi-line intersections: application to olivine and feldspar (1976)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 9 (1976), S. 9-13 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The method of determining the ratio between lattice parameter and electron wavelength from Kikuchi-line intersections with an accuracy about 0.1% which was described by Høier [Acta Cryst. (1969). A25, 516–518] for cubic crystals, is extended to crystals with any lower symmetry. A computer program using a least-squares refinement has been developed and applied to the determination of unknown lattice parameters in an orthorhombic olivine and a triclinic feldspar crystal. A combination of energy-dispersive X-ray analysis and Kikuchi-line intersection measurements can in many cases be utilized to increase the accuracy in the determination of the lattice parameters. For the feldspars such a combination of measurements can be used to determine the distribution of the Al and Si atoms in the tetrahedral positions of the structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889876010406
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  • 14
    Electronic Resource
    Electronic Resource
    Androgen-insensitive rats are defeminised by their testes (1979)
    [s.l.] : Nature Publishing Group
    Nature 279 (1979), S. 238-239 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Androgen-insensitive male rats of the Stanley-Gumbreck strain (n = 16) and their male littermates (n = 19) were castrated within 24 h of birth or 10 d after birth at the International Foundation for the Study of Rat Genetics and Rodent Control (Introgen), Oklahoma City. At weaning, the rats were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/279238a0
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  • 15
    Electronic Resource
    Electronic Resource
    IncP2 group of Pseudomonas , a class of uniquely large plasmids (1978)
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 715-717 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our plasmid isolation method (summarised in Fig. 1) was developed from the hypothesis of Kline et a/.6 that quantitative nonintegrative attachment of stringently replicating plasmids to the bacterial folded chromosome acts as both the site and the mechanism of replication and segregation of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/274715a0
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  • 16
    Electronic Resource
    Electronic Resource
    Chaos in an enzyme reaction (1977)
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 177-178 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Oscillations in oxygen concentration in peroxidase catalysed oxidation of NADH in system open to O2. A stirred 5 ml sample containing horseradish peroxidase, 10 uM 2,4-dichlorophenol and 0.2 jaM methylene blue in a 0.1 M Na-acetate buffer p.H 5.1 was in contact with an O2/N2 gas mixture at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/267177a0
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  • 17
    Electronic Resource
    Electronic Resource
    Effect of oestrogen antagonist on hypothalamic oestrogen receptors (1975)
    [s.l.] : Nature Publishing Group
    Nature 258 (1975), S. 742-743 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Eighty female rats were ovariectomised at 8 weeks of age and used 4-25 d later. Groups of five rats were iniected intravenously with 2.5 Mg of oestradiol, 500 Mg of CI-628 (1-[2-O [a-(/7-methoxyphenyl)-/?-mtrostyryl] phenoxy) ethyl] pyrrolidine monocitrate) (Parke-Davis) or with oestradiol followed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/258742a0
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  • 18
    Electronic Resource
    Electronic Resource
    Suppression of murine lupus erythematosus by Dactinomycin (1976)
    [s.l.] : Nature Publishing Group
    Nature 264 (1976), S. 439-440 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Longevity of Dactinomycin-treated NZB/NZW mice to 405 d. Control deaths began at about 6 months of age, and the last control died at close to 12 months. The cut-off on the graph was arbitrary, but all treated mice were alive beyond 450 d. In the present series female B/W mice were treated ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/264439a0
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  • 19
    Electronic Resource
    Electronic Resource
    Transient tritanopia experiment in blue cone monochromacy (1978)
    [s.l.] : Nature Publishing Group
    Nature 276 (1978), S. 390-391 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The blue cone monochromat (BTW), a 17-yr-old male, had visual acuity of 6/60 in each eye. He had pendular nystagmus and moderate photophobia. The presence of functioning blue cones was ascertained during the clinical examination and by spectral sensitivity studies3. By means of two modified Prado ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/276390a0
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  • 20
    Electronic Resource
    Electronic Resource
    Abrogation of lymphocyte blastogenesis by a feline leukaemia virus protein (1978)
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 687-689 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 SDS-polyacrylamide gel electro-phoresis of FeLV and purified pi5 and p27. Gels consisted of 7.5% acrylamide with 5% bisacrylamide in a Tris-acetate buffer containing 0.205 M Tris, 0.205 M acetic acid and 0.1% SDS, pH 6.6. Protein samples were mixed with equal volumes of 0.02 M Tris, 0.02 M ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/274687a0
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