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  • 1
    Electronic Resource
    Electronic Resource
    Degradation of the coer-releasing intrauterine contraceptive device and its significance (1984)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 91 (1984), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Measurements were made of the coer remaining on used Gravigard intrauterine contraceptive devices (lUCDs) that had been in utero for up to 40 months. The topography and composition of the surface deposits were analysed by scanning electron microscopy and energy-dispersive X-ray analysis. The rate of coer loss decreased exponentially from 0–42 μmol d−1 (26–7 μg d−1) upon insertion to 0-056 μimol d−1 (3–6 μg d−1) after 26 months of use; between 27 and 40 months of use a linear release of 0–32 μimol d−1 (20–3 μg d−1) was observed. There was no correlation between this changing rate of coer loss and the pregnancy rate with the device in situ. The changes in the rate of coer loss were probably due to the growth of a surface corrosion product which, due to internal stresses, fractured after about 2 years and exposed fresh coer; this results in a progressive increase in breakage of the coer wire after 3 years. It is recommended that a coer IUCD of this type be replaced after 3 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1984.tb05903.x
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  • 2
    Electronic Resource
    Electronic Resource
    THE SCANNING ELECTRONMICROSCOPY OF HUMAN CERVICAL MUCUS IN THE NON-PREGNANT AND PREGNANT STATES (1976)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 83 (1976), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The ultrastructure of the high viscosity phase of human cervical mucus was studied by scanning electronmicroscopy. In the normal woman, sequential mucus samples taken throughout the menstrual cycle showed a honeycomb-like structure with interconnecting channels separated by thin membraneous walls. The diameter of the channels in the mucus was 2 to 6 μm in the early follicular phase, 30 to 35 μm in the late follicular phase and 4 to 6 μm in the luteal phase. During the first trimester of pregnancy and also at the beginning and end of the menstrual cycle a compact, dense form of mucus structure was observed. In women using either copper-releasing or pharmacologically inert intrauterine contraceptive devices (IUCDs), the basic structure was similar to that seen in normal women. The channel diameters were normal in women using the inert IUCD but the mucus from women using a copper-releasing IUCD showed a slight decrease in the late follicular phase channel diameter which was dependent on the time the device had been in place. Globular appendages to the membraneous walls of the mucus were observed in the presence of a copper-releasing IUCD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1976.tb00925.x
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  • 3
    Electronic Resource
    Electronic Resource
    CARBONIC ANHYDRASE ACTIVITY IN HUMAN CERVICAL MUCUS AND ITS RESPONSE TO VARIOUS CONTRACEPTIVE REGIMES (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: Carbonic anhydrase activity is present in human cervical mucus throughout the normal menstrual cycle. Lowest activity occurs in the ovulatory phase. A similar pattern of activity is seen in the presence of either an ‘inert’ or copper-releasing intrauterine contraceptive device (IUCD). The overall levels of activity are not significantly altered by the presence of either type of IUCD. A cyclic pattern of activity is retained even though endogenous ovarian function is suppressed by combined oestrogen-progestogen oral contraceptives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1977.tb12685.x
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Inhibitors of Protein Synthesis on the Plastic Deformation and Growth of Plant Tissues (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 1289-1290 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the past few years it has become clear that nucleic acid and protein synthesis are required for auxin.induced growth. This is suggested partly by the finding that various inhibitors of the synthesis of these macromolecules prevent the growth.promoting action of auxin. As yet it is not clear ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2151289a0
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  • 5
    Electronic Resource
    Electronic Resource
    Apparatus for the study of motile sperm using microprocessor analysis of scattered laser light (1982)
    Springer
    Medical & biological engineering & computing 20 (1982), S. 207-214 
    Details
    ISSN: 1741-0444
    Keywords: Autocorrelation ; Doppler effect ; Laser ; Light scattering ; Microprocessor ; Sperm motility ; Sperm velocity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract An apparatus for the analysis of scattered laser light from motile human sperm samplesin vitro is described. The scattered light is converted to electrical signals by a photomultiplier and the signals resulting from Doppler effects due to sperm movement are analysed using a microprocessor. Autocorrelation functions produced by the apparatus are in agreement with theoretical predictions based on an accepted swimming speed distribution. Measurements on samples have been used to yield values of percentage motility and velocity of sperm which are in agreement with results obtained by other methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441357
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