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  • 1975-1979  (3)
  • 1977  (3)
Material
Years
  • 1975-1979  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 84 (1977), S. 0 
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Erythrocyte 2,3-diphosphoglycerate (2,3-DPG) and associated haematological parameters were measured throughout the normal menstrual cycle, in each trimester of pregnancy and on the third day post partum. There was no significant change during the menstrual cycle but the 2,3-DPG concentration was increased early in pregnancy, and thereafter gradually decreased. Although other metabolic changes are likely to contribute to the increase in 2,3-DPG concentration, it is concluded that ‘functional anaemia’, secondary to increased oxygen demand, is a more important stimulus than the decrease in haemoglobin concentration. The implications of a decreased oxygen affinity of haemoglobin, secondary to the rise in 2,3-DPG concentration, are discussed in relation to anaemia and blood transfusion in pregnancy.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of virology 54 (1977), S. 373-377 
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary T1-RNase oligonucleotide fingerprints indicated that the two species of RNA from infectious pancreatic necrosis virus were unrelated. Both RNAs had a GC content of 54 per cent.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 9 (1977), S. 249-258 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The coupling between bound modes of a corrugated dielectric-slab waveguide and modes of the radiation continuum is analysed by a perturbation method. Loss coefficients that account for the power coupled into radiation modes by any Bragg order of corrugations with an arbitrary profile are determined for the bound modes. Agreement is found with published results for sinusoidal profiles. The proportion of power coupled out through each dielectric interface of the slab waveguide is also determined. When the corrugation has an asymmetric (blazed) profile and coupling to radiation modes is by the first Bragg order, more power can be coupled out through one interface than the other, even if the refractive indices of the cladding regions are equal. If the coupling is by a higher Bragg order, then the division of power can be considerably more unequal than for first-order coupling, with the greater proportion leaving the side of the waveguide opposite to that for first-order coupling. The ratio of the power coupled out the two sides varies cyclically with radiation wavelength.
    Type of Medium: Electronic Resource
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