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  • 1
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of the present study was to determine the diurnal secretion of melatonin, cortisol, prolactin, calcitonin during chronic parathyroid hormone-dependent hypercalcemia. Eight women, aged 40–76 years, with primary hyperparathyroidism (PHPT) were studied before after surgical removal of a parathyroid adenoma. The hormone concentrations in blood were determined at 08, 12, 16, 22, 02, 04, 06 h. Concomitantly, the excretion of melatonin cortisol in urine between 07–19 h 19–07 h, the clearance of calcium creatinine were measured.Nyctohemeral serum prolactin calcitonin were unaffected by moderate parathyroid hormone-dependent hypercalcemia. In contrast, serum cortisol melatonin were significantly higher during active disease than after surgical cure. Mean 24-h variation of serum cortisol was 349 ± 34 nmol/liter vs. 223 ± 17 nmol/liter mean serum melatonin was 0.13 ± 0.04 nmol/liter vs. 0.06 ± 0.02 nmol/liter. Endogenous creatinine clearance was similar before after surgery, while the clearance of melatonin cortisol significantly increased after surgery, indicating an increased tubular reabsorption of both hormones during active disease. Fasting morning glucose concentrations were also significantly decreased after successful surgery, 6.1 ± 0.6 vs. 5.2 ± 0.5 mmol/liter. It is suggested that the relative hypercortisolism may be the cause of the glucose intolerance in primary hyperparathyroidism.Three to 4 months after surgical cure the serum melatonin levels were significantly lower than those seen in age-matched controls, indicating a melatonin insufficiency in patients successfully treated for PHPT. The meaning of this finding is not yet understood but might be of importance in the development of primary hyperparathyroidism.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 383-392 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is predicted that, at some sufficiently high level of sensitivity, two streaks intersecting at the Bragg point and symmetrically situated about the reciprocal-lattice vector G should always be observable in a diffraction experiment.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3404-3406 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The incommensurate magnetic peaks occurring in Cu1−x Mnx at (1,0.5±δ,0) and equivalent positions in reciprocal space have been studied in an extensive series of neutron scattering experiments. It is found that δ varies linearly with composition, and that the width of these peaks corresponds to a correlation range of about 10 fcc unit cells. The symmetry of the magnetic scattering indicates that there are 12 spin density wave domains. Experiments performed under high-resolution conditions (61 μ eV) show that the elastic component of the magnetic scattering cross section at (1,0.5±δ,0) approaches zero in the vicinity of the "freezing'' temperature Tf, closely resembling the behavior of an order parameter going to zero at a Néel point.
    Type of Medium: Electronic Resource
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