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  • 1
    Electronic Resource
    Electronic Resource
    Positron annihilation spectroscopy applied to porous silicon films (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4411-4415 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A monoenergetic slow positron beam has been used for the first time to profile porous silicon films. High values of the Doppler-broadened line shape parameters are observed, which correspond to positron annihilation within the porous layers and these are attributed to the decay of para-positronium. After allowing for the reduced density of the porous film, fitted values of thickness were deduced which were in reasonable agreement with values obtained from ellipsometry measurements. Low values of the Doppler parameters observed for the two samples with the thinnest films are attributed to oxide residing at the interface of the porous and bulk silicon regions. Etching the samples in a solution of 48% hydrogen fluoride reduced the porous film thickness significantly, suggesting that a considerable amount of the film consists of SiO2. A four-component convolution analysis routine is used to analyze the individual 511 keV annihilation peaks, the result of which confirms the formation of positronium within the porous layer. Positron annihilation is shown to be a promising method for the nondestructive investigation of thin porous films. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359848
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  • 2
    Electronic Resource
    Electronic Resource
    Immunobiology of CR2, the B Lymphocyte Receptor for Epstein-Barr Virus and the C3d Complement Fragment (1988)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Immunology 6 (1988), S. 85-113 
    Details
    ISSN: 0732-0582
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.iy.06.040188.000505
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  • 3
    Electronic Resource
    Electronic Resource
    The Clinical use of Colony Stimulating Factors (1991)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Immunology 9 (1991), S. 159-191 
    Details
    ISSN: 0732-0582
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.iy.09.040191.001111
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  • 4
    Electronic Resource
    Electronic Resource
    Haemodynamic changes during the puerperium: a Doppler and M-mode echocardiographic study (1987)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 94 (1987), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Serial haemodynamic investigations were performed in 15 women at 38 weeks gestation and then 2, 6, 12 and 24 weeks after delivery. Cardiac output was measured by Doppler and cross-sectional echocardiography at the aortic, pulmonary and mitral valves. Cardiac chamber size and ventricular function were investigated by M-mode echocardiography. Flow measurements at the three intracardiac sites correlated closely. Cardiac output fell from a mean of 7.421/min at 38 weeks to 4.961/min at 24 weeks after delivery, a fall of 33%. Most of this decrease (28%) had occurred by 2 weeks. This was associated with a 20% reduction in heart rate and an 18% reduction in stroke volume. By 2 weeks after delivery there was a significant decrease in left atrial dimension and left ventricular end-diastolic dimension. Left ventricular wall thickness and mass declined throughout the period of study as did aortic, pulmonary and mitral valve areas. M-mode derived indices of myocardial contractility were all significantly reduced by 2 weeks and thereafter showed no further change. No haemodynamic differences were found between lactating and non-lactating mothers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1987.tb02286.x
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  • 5
    Electronic Resource
    Electronic Resource
    PREGNANCY AND THE ACUTE PORPHYRIAS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 84 (1977), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: An analysis is presented of the obstetric histories of 50 women with acute porphyria, comprising 39 with acute intermittent porphyria, 3 with variegate porphyria and 8 with hereditary coproporphyria. Fifty-four per cent of the women with acute intermittent porphyria had an acute attack of porphyria in pregnancy and/or the puerperium. Only one maternal death was recorded. One patient with variegate porphyria and two with hereditary coproporphyria had an attack related to pregnancy. The total fetal wastage was 13 per cent. The babies born to mothers with acute intermittent porphyria, who experienced an acute attack during pregnancy, were smaller than those in which no such attack occurred (P〈0·001). In 13 non-porphyric primigravidae there was a rise in urinary excretion of 8-aminolaevulinic acid, porphobilinogen and coproporphyrin up to the 28th week of gestation. It is probable that pregnancy has some deleterious effects in acute porphyria but the prognosis of the porphyric pregnancy is much better than the literature suggests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1977.tb12480.x
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  • 6
    Electronic Resource
    Electronic Resource
    Combined Doppler and echocardiographic measurement of cardiac output: theory and application in pregnancy (1987)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 94 (1987), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. A non-invasive technique for the measurement of cardiac output in pregnancy by combined cross-sectional and Doppler echocardiography at three intracardiac sites is described. The validity of the technique for use during pregnancy is reviewed. Comparison with cardiac output determined simultaneously by the direct Pick technique in 15 non-pregnant subjects showed close agreement for all three measurement sites. Acceptable measurements were obtained from the aortic and pulmonary valves in all pregnant subjects and from the mitral valve in 84% of pregnant subjects. The within-patient intra-observer and hour-to-hour variabilities of cardiac output in pregnant and non-pregnant subjects were 〈5% of the mean for all three valves studied. Flow measurements at each of the three intracardiac sites correlated closely. The advantages and limitations of the technique for use during pregnancy are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1987.tb02285.x
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  • 7
    Electronic Resource
    Electronic Resource
    Lymphocyte subsets in normal and pre-eclamptic pregnancies (1983)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 90 (1983), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. Peripheral blood lymphocyte subsets in normal and preeclamptic pregnancies have been studied by using the monoclonal antibodies OKT3 (T cells), OKT4 (helper/inducer T cells) and OKT8 (suppressor/cytotoxic T cells). In addition the numbers of mononuclear cells bearing la and monocyte antigens have been assessed by using the monoclonal antibodies OKIal and OKM1. No significant differences were found between 10 normal pregnant and 10 non-pregnant subjects. Ten preeclamptic patients were studied and showed an increase in OKT4-positive helper cells. This was significant in terms of percentage of mononuclear cells but not the absolute numbers or the helper/suppressor (OKT4/OKT8) ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1983.tb08918.x
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  • 8
    Electronic Resource
    Electronic Resource
    PRENATAL AND POSTNATAL MATERNAL LEUCOCYTE ASCORBIC ACID CONCENTRATIONS (1979)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 86 (1979), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Leucocyte ascorbic acid was measured in 79 pregnant women in the 34th to 38th week of gestation and on the first, and third or fifth days post partum. No differences were found for time of year or age of the subjects. There was a significantly lower vitamin C status in social classes IV and V. The leucocyte ascorbic acid concentration fell significantly on the first day post partum and rose again to initial values by the fifth day. In late pregnancy 40 per cent of all subjects had leucocyte ascorbic acid concentrations less than the lower limit of normal (100 nmol/l08 leucocytes). This rose to 75 per cent on the first day post partum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1979.tb11259.x
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  • 9
    Electronic Resource
    Electronic Resource
    Medicinal Chemistry. (1951)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 43 (1951), S. 577-588 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50495a015
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  • 10
    Electronic Resource
    Electronic Resource
    Oxidation and Glucose Conjugation of Synthetic Abietane Diterpenes by Cunninghamella sp. II. Novel Routes to the Family of Diterpenes from Tripterygium wilfordii (1995)
    s.l. : American Chemical Society
    Journal of natural products 58 (1995), S. 68-73 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50115a008
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