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Träfflista för sökning "LAR1:uu ;hsvcat:1;srt2:(1950-1974)"

Sökning: LAR1:uu > Naturvetenskap > (1950-1974)

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  • Alm, Gunnar V., et al. (författare)
  • The in vitro maturation of the embryonic chicken thymus, 1: : Development of an Organ Culture System
  • 1972
  • Ingår i: Acta Pathologica Microbiologica Scandinavica, Section A Pathology. - : Wiley. - 0365-4184. ; A 80:6, s. 778-784
  • Tidskriftsartikel (refereegranskat)abstract
    • An organ culture technique is described which permits the lymphoid development of the thymic anlagen of 10-day-old chick embryos for at least 10 days in vitro. Grid organ cultures of a modified Trowell type were employed. Among several tissue culture media tested, Waymouth's MB 752/1 medium gave superior results. In initial experiments this medium was supplemented with heat-inactivated horse serum and embryo-extract. Subsequently it was found that this supplement could be substituted for by chicken serum alone. The morphological development of the embryonic thymic anlagen in organ culture has been characterized. Typical lymphoid cells developed from the initial lymphoid precursor cells. Late in the culture period, large numbers of small lymphocytes appeared. Extensive cell proliferation was demonstrated during the first 6 days of culture by means of autoradiography. This organ culture technique should facilitate the further analysis of factors influencing thymic lymphocytopoiesis as well as of the role of the thymus in the development of lymphocyte functions.
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6.
  • Almlöf, Jan (författare)
  • Hydrogen bond studies. 71. Ab initio calculation of the vibrational structure and equilibrium geometry in HF−2 and DF−2
  • 1972
  • Ingår i: Chemical Physics Letters. - 0009-2614 .- 1873-4448. ; 17:1, s. 49-52
  • Tidskriftsartikel (refereegranskat)abstract
    • MO LCAO SCF calculations have been performed to investigate the molecular astructure and vibrational spectrum of the bifluoride ion in its normal and deuterated form. The potential energy for nuclear motions has been evaluated as a function of the molecular degrees of freedom, taking only linear geometries into account. The vibrational Schrödinger equation has been solved by expanding the vibrational part of the total wavefunction as a sum of products of linear harmonic-oscillator eigenfunctions. The calculated properties are in good agreement with experiments, and even the minute effects of deuteration are well reproduced.
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  • Beckman, O., et al. (författare)
  • Structural changes of KMnF3at low temperatures
  • 1960
  • Ingår i: Acta Crystallographica. - : International Union of Crystallography (IUCr). - 0365-110X. ; 13:6, s. 506-506
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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10.
  • Beckman, O., et al. (författare)
  • Susceptibility Measurements and Magnetic Ordering of Hexagonal FeGe
  • 1972
  • Ingår i: Physica scripta. T. - : IOP Publishing. - 0281-1847 .- 0031-8949 .- 1402-4896. ; 6:2-3, s. 151-157
  • Tidskriftsartikel (refereegranskat)abstract
    • The spin structure of the metallic hexagonal B 35 phase of FeGe has been studied by means of susceptibility and magnetization measurements. Below the Neel temperature TN = 411 K hexagonal FeGe is a uniaxial antiferromagnet with the spins parallel to the c-axis. In each c-plane all spins are ferromagnetically coupled with an exchange constant J0 ≈ 22 meV. The antiferromagnetic exchange constant between nearest neighbour and next nearest neighbour c-planes are J1 = -3.5 meV and J2 = -0.9 meV resp. in the molecular field model. Susceptibility and spin flop experiments indicate that the spins tilt away from the c-axis below 30 K. We suggest that the spins then form a double cone structure with a cone halfangle of 20° at 4.2 K. In the double cone the c-plane components have a turn angle in the vicinity of 180° between nearest neighbour planes, which implies absence of long range order. The result is in good agreement with Fermi surface calculations by Sundström (Physica Scripta, following paper), which show the existence of several spin density wave vectors between Q = 0.89 π/c and Q = 1.3 π/c calipering different parts of the Fermi surface in a direction parallel to the c-axis.
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