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  • 1
    Electronic Resource
    Electronic Resource
    Thermal diffusivity of superconducting YBa2Cu3O7−x (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5044-5047 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermal diffusivity results for superconducting YBa2Cu3O7−x systems are reported. Two laser excitation techniques were used: photoacoustic phase-lag and the flash method. We observed an anomalous jump in the thermal diffusivity at the critical temperature and related it to the electronic specific heat anomaly. This correlation yielded a characteristic phonon frequency of 320 cm−1 in the range of an active Raman mode already observed in a single crystal of the same compound. This result reinforces the current electron-phonon coupling mechanism as responsible for superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340401
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic order in acmite: Ac"8"1Di"1"9
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 75 (1988), S. 171-174 
    Details
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-8853(88)90137-0
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  • 3
    Electronic Resource
    Electronic Resource
    Calcium Kinetics in Children with Osteogenesis Imperfecta Type III and IV: Pre- and Post-Growth Hormone Therapy (2000)
    Springer
    Calcified tissue international 67 (2000), S. 97-100 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Stable isotopes — Bone-metabolism — Children.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Children with osteogenesis imperfecta (OI) type III and type IV were studied using a 42Ca stable isotope technique. Serum dilution kinetics of 42Ca were studied pre- and post-growth hormone (GH) treatment in 9 OI III (age range 5–9 years) and 8 OI IV patients (age range 5–12 years). Each subject was studied twice: at baseline and following GH therapy (range 1–1.5 years). Isotopic enrichments of 42Ca were followed over 7 days using thermal ionization mass spectrometry. A binding site model, which describes reversible and irreversible binding of calcium (Ca) ions to postulated short- and long-term binding sites in bone, was used to analyze the kinetic data. In type III patients, GH treatment (1) increased the fraction of short-term binding sites, θ (0.777 ± 0.112 versus 0.877 ± 0.05, respectively; P= 0.034); (2) increased the apparent half-life of a Ca ion attached to the long-term binding site by 76% (P= 0.009); (3) although not statistically significant (P= 0.098), a trend toward an increased growth rate was observed with increasing change in θ (Δθ); (4) patients experienced a 75% increase in growth rate during the first 6 months of treatment. In type IV patients, GH treatment increased the apparent half-life of a Ca ion attached to the long-term binding site by 83% (P= 0.048), however, no trend toward an increased growth rate was observed with increasing Δθ in these patients. These significant changes in Ca binding to bone may influence growth in type III patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00223001110
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of age on effects of endogenous 1,25-dihydroxyvitamin D on calcium absorption in normal women (1994)
    Springer
    Calcified tissue international 55 (1994), S. 330-334 
    Details
    ISSN: 1432-0827
    Keywords: Age ; Vitamin D ; Calcium absorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Recent reports of increases in serum 1,25-dihydroxyvitamin D [1,25(OH2)D] concentration with aging despite no changes or decreases in calcium absorption suggest that elderly women have intestinal resistance to vitamin D action. Thus, in 15 young adult (30±1 year) and 15 elderly (74±1 year) women (mean±SE), we assessed the responsiveness of intestinal calcium absorption to increases in circulating 1,25(OH)2D induced by 4 days of an experimental diet (150 mg calcium and 1600 mg phosphorus daily). True fractional calcium absorption (FCA) (44Ca mixed with food and 42Ca given intravenously, then their ratio in urine measured by mass spectrometry) was determined. Baseline serum intact parathyroid hormone (PTH) concentration was higher in the older women (P=0.01) whereas serum 1,25(OH)2D concentration and true FCA were similar. In both groups, serum 1,25(OH)2D concentrations increased (P〈0.002) on the experimental diet. After 4 days on the diet, serum 1,25(OH)2D increased over baseline by 30.5 and 35.6% and, despite these increases, true FCA was 40±3 versus 40±4%/24 hours (NS between groups) in the young and elderly women, respectively. These data suggest that either elderly women have normal intestinal responsiveness to vitamin D or that the resistance to it is too mild to be detected by these methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299309
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  • 5
    Electronic Resource
    Electronic Resource
    Calcium Kinetics in Glycogen Storage Disease Type 1a (1996)
    Springer
    Calcified tissue international 59 (1996), S. 449-453 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Glycogen storage disease 1a — Von Gierke's disease — Calcium metabolism — Calcium kinetics — Calcium stable isotopes.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Glycogen storage disease type 1a (Von Gierke's disease) is one of the more common glycogen storage diseases (GSD). GSD 1a patients can have severe idiopathic osteopenia, often beginning at a young age. Since calcium tracer studies offer a sensitive probe of the bone microenvironment and of calcium deposition, kinetics might be disturbed in patients with GSD 1a. Plasma dilution kinetics obtained using the stable isotope 42Ca are shown in this paper to be quite different between GSD 1a patients and age-matched controls. Comparison of kinetic parameters in these two populations is made using a new binding site model for describing calcium dynamics at the plasma-bone interface. This model describes reversible binding of calcium ions to postulated short-term and long-term sites by a retention probability density function ψ (t). Using this analysis, adult GSD subjects exhibited a significant decrease (P= 0.023) in the apparent half-life of a calcium ion on the longer-term site compared with controls. The general theory of calcium tracer dilution kinetics is then discussed in terms of a new model of short-term calcium homeostasis recently proposed by Bronner and Stein [5].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369209
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  • 6
    Electronic Resource
    Electronic Resource
    Calcium kinetics in glycogen storage disease type 1a (1996)
    Springer
    Calcified tissue international 59 (1996), S. 449-453 
    Details
    ISSN: 1432-0827
    Keywords: Glycogen storage disease 1a ; Von Gierke's disease ; Calcium metabolism ; Calcium kinetics ; Calcium stable isotopes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Glycogen storage disease type 1a (Von Gierke's disease) is one of the more common glycogen storage diseases (GSD). GSD 1a patients can have severe idiopathic osteopenia, often beginning at a young age. Since calcium tracer studies offer a sensitive probe of the bone microenvironment and of calcium deposition, kinetics might be disturbed in patients with GSD 1a. Plasma dilution kinetics obtained using the stable isotope 42Ca are shown in this paper to be quite different between GSD 1a patients and age-matched controls. Comparison of kinetic parameters in these two populations is made using a new binding site model for describing calcium dynamics at the plasma-bone interface. This model describes reversible binding of calcium ions to postulated short-term and long-term sites by a retention probability density function ψ (t). Using this analysis, adult GSD subjects exhibited a significant decrease (P=0.023) in the apparent half-life of a calcium ion on the longer-term site compared with controls. The general theory of calcium tracer dilution kinetics is then discussed in terms of a new model of short-term calcium homeostasis recently proposed by Bronner and Stein [5].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369209
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  • 7
    Electronic Resource
    Electronic Resource
    F-center-laser. Superconductivity (1982)
    Springer
    Applied physics 28 (1982), S. 306-310 
    Details
    ISSN: 1432-0649
    Keywords: 68 ; 42.70 ; 42.60 ; 61.70 ; 61.50 ; 42.80 ; 29
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697860
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  • 8
    Electronic Resource
    Electronic Resource
    Fayalitic olivine composition in an H-type chondrite (1994)
    Springer
    Hyperfine interactions 83 (1994), S. 457-461 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low temperature Mössbauer spectroscopy is used to investigate the composition and the iron distribution in the M1 and M2 crystallographic sites of a fayalitic olivine in an H-type chondrite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02074317
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  • 9
    Electronic Resource
    Electronic Resource
    Fluctuation in the zooplankton community in two solar salt ponds, Aveiro, Portugal (1995)
    Springer
    International journal of salt lake research 4 (1995), S. 327-333 
    Details
    ISSN: 1573-8590
    Keywords: density ; diversity ; fluctuation ; hypersaline ecosystems ; salt ponds ; zooplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract The zooplankton of two salt ponds at Aveiro was studied to evaluate its density and diversity. Samples were collected biweekly from the salt ponds Esmolas and Tanoeiras. Samples were first separated into Holoplankton (Copepoda, nauplii,Acartia, Ostracoda and Anostraca) and Meroplankton (Mollusca, Insecta, annelidan larvae and Ichthyoplankton). The Holoplankton was mainly composed of:Acartia tonsa, Acartia sp.,Eurytemora velox, Artemia sp., and harpacticoids and calanoids. In both salt ponds, species diversity was identical, but total zooplankton density was higher in the Tanoeiras salt pond, probably because its physical and chemical characteristics allowed the development of stable communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01999116
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  • 10
    Electronic Resource
    Electronic Resource
    The invertebrate benthic community of two solar salt ponds in Aveiro, Portugal (1996)
    Springer
    International journal of salt lake research 5 (1996), S. 281-286 
    Details
    ISSN: 1573-8590
    Keywords: benthic community ; density ; diversity ; salt ponds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract The invertebrate benthic community of two Aveiro salt pond systems was studied in order to evaluate its diversity, density and the influence of organic matter and salt production. Samples were collected monthly at Esmolas and Tanoeiras. Five groups of benthic organisms were found: Nemathelminthes, Annelida (Nereis diversicolor), Crustacea (Sphaeroma serratum andTanais cavolini), Insecta (Chironomidae), Bivalvia Mollusca (Cerastoderma edule, Spisula solida andMya arenaria) and Gasteropoda Mollusca (Hydrobia ulvae, Cingulla cingullus, Cingulla semistriata, Odostomia rissoides, Odostomia unidentata, Scrobicularia alba, Valvata cristata andPaludestrina acuta). The highest density of the benthic community was observed during the non-productive season in all but the crystallizing pond systems. In both salt ponds, salinity acted as limiting factor. The dominant group was Gasteropoda, although high densities of Bivalvia were recorded in some ponds. In the feeder pond and the channels, species diversity was highest in the Tanoeiras salt pond, probably because its physical and chemical characteristics allowed the development of stable communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01995382
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