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  • 1
    Electronic Resource
    Electronic Resource
    Age-Related Decline of Bone Mass and Intestinal Calcium Absorption in Normal Males (1998)
    Springer
    Calcified tissue international 63 (1998), S. 197-201 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Bone mass — Intestinal calcium absorption — Aging in men.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Although about 25% of all hip fractures occur in men, little is known about the pattern of their age-related bone loss and its main determinants. The aim of this cross-sectional study was to evaluate the age-related changes of intestinal calcium absorption, bone mass, and bone turnover in normal men. In 70 normal males (age 17–91 years), we measured spinal and forearm bone density (FBD) (by DXA), fractional intestinal calcium absorption (by oral test), serum immunoreactive parathyroid hormone (PTH), dietary calcium intake (diet records), biochemical markers of bone turnover (serum alkaline phosphatase (ALP), osteocalcin, urine calcium, creatinine, and hydroxyproline), and 1,25(OH)2D3 serum levels. Vertebral bone density (VBD) showed a modest decline before age 50 and a greater decline after age 50, whereas FBD presented a significant decrease with advancing age starting at age 40, suggesting a predominant age-related cortical bone loss. Intestinal calcium absorption (47CaFA) and serum 1,25(OH)2D3 also presented an age-related decline similar to FBD. Simple correlation analysis revealed that age was significantly related to 47CaFA (r = 0.60), calcium intake (r = 0.32), VBD and FBD (r = 0.79 and 0.63, respectively), serum 1,25(OH)2D3 (r = 0.69), and serum iPTH (r = 0.72). No significant correlation was found between age and biochemical markers of bone remodeling. Partial correlation and stepwise variable selection analyses, using 47CaFA and bone mass as dependent variables, showed that in normal males, serum 1,25(OH)2D3 and dietary calcium intake were the main contributors (64%) to 47CaFA variability, whereas only age accounted for 63% of VBD and age and dietary calcium accounted for 45% of FBD variability. These results indicate that bone loss in men accelerates after age 50 years and that among other factors, intestinal calcium malabsorption and 1,25(OH)2D3 serum levels play a role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900514
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  • 2
    Electronic Resource
    Electronic Resource
    On the 1/D expansion for directed polymers (1999)
    Springer
    The European physical journal 8 (1999), S. 603-611 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.40.+j Fluctuation phenomena, random processes, and Brownian motion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present a variational approach for directed polymers in D transversal dimensions which is used to compute the correction to the mean field theory predictions with broken replica symmetry. The trial function is taken to be a symmetrized version of the mean-field solution, which is known to be exact for . We compute the free energy corresponding to that function and show that the finite-D corrections behave like D -4/3 . It means that the expansion in powers of 1/D should be used with great care here. We hope that the techniques developed in this note will be useful also in the study of spin glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050727
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  • 3
    Electronic Resource
    Electronic Resource
    Critical properties of a three-dimensional p-spin model (1999)
    Springer
    The European physical journal 8 (1999), S. 417-422 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.50.+q Lattice theory and statistics; Ising problems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In this paper we study the critical properties of a finite dimensional generalization of the p-spin model. We find evidence that in dimension three, contrary to its mean field limit, the glass transition is associated to a diverging susceptibility (and correlation length).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050707
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  • 4
    Electronic Resource
    Electronic Resource
    Numerical simulations of the dynamical behavior of the SK model (1998)
    Springer
    The European physical journal 2 (1998), S. 495-500 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.10.-b General theory and models of magnetic ordering - 75.50.-y Studies of specific magnetic materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the dynamical behavior of the Sherrington Kirkpatrick model. Thanks to the APE supercomputer we are able to analyze large lattice volumes, and to investigate the low T region. We present a new and precise determination of the remnant magnetization and of its time decay exponent, of the energy time decay exponent, and we discuss aging phenomena in the model. We exclude validity of naive aging, and propose different options that fit the numerical data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050273
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  • 5
    Electronic Resource
    Electronic Resource
    Generalized off-equilibrium fluctuation-dissipation relations in random Ising systems (1999)
    Springer
    The European physical journal 11 (1999), S. 317-325 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) - 75.10.Nr Spin-glass and other random models - 75.40.Mg Numerical simulation studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We show that the numerical method based on the off-equilibrium fluctuation-dissipation relation does work and is very useful and powerful in the study of disordered systems which show a very slow dynamics. We have verified that it gives the right information in the known cases (diluted ferromagnets and random field Ising model far from the critical point) and we used it to obtain more convincing results on the frozen phase of four-dimensional spin glasses. Moreover we used it to study the Griffiths phase of the diluted and the random field Ising models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1088/0953-8984/11/28/101
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of introduced Japanese macroalgae Undaria pinnatifida, Sargassum muticum (Phaeophyta) and Antithamnion Pectinatum (Rhodophyta) in the Lagoon of Venice (1998)
    Springer
    Hydrobiologia 385 (1998), S. 17-22 
    Details
    ISSN: 1573-5117
    Keywords: Undaria pinnatifida ; Sargassum muticum ; Antithamnion pectinatum ; Lagoon of Venice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present distribution of invasive seaweeds Undaria pinnatifida (Phaeophyta, Laminariales) and Sargassum muticum (Phaeophyta, Fucales) in the Lagoon of Venice is updated in this work. The distribution of Antithamnion pectinatum (Rhodophyta, Ceramiales) is presented for the first time. All these species have quickly colonized the hard substrata competing with indigenous species. Competition acts differently in the two species, U. pinnatifida competing for the substratum and S. muticum for light. On tidal flats composed of silt and sand, the growth of two brown seaweeds is restricted owing to the lack of a solid substrata. While Undaria pinnatifida and Sargassum muticum have colonized only some areas of the lagoon in a short vertical range (from 0 to -3 m), Antithamnion pectinatum is present on the three portmouths, along the inner shores of the city of Venice, and in the lagoon islands with extensive vertical distribution (from +0.2 to -8 m).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003437105147
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Distribution of introduced Japanese macroalgae Undaria pinnatifida, Sargassum muticum (Phaeophyta) and Antithamnion Pectinatum (Rhodophyta) in the Lagoon of Venice (1998)
    Springer
    Hydrobiologia 385 (1998), S. 17-22 
    Details
    ISSN: 1573-5117
    Keywords: Undaria pinnatifida ; Sargassum muticum ; Antithamnion pectinatum ; Lagoon of Venice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The present distribution of invasive seaweeds Undaria pinnatifida (Phaeophyta, Laminariales) and Sargassum muticum (Phaeophyta, Fucales) in the Lagoon of Venice is updated in this work. The distribution of Antithamnion pectinatum (Rhodophyta, Ceramiales) is presented for the first time. All these species have quickly colonized the hard substrata competing with indigenous species. Competition acts differently in the two species, U. pinnatifida competing for the substratum and S. muticum for light. On tidal flats composed of silt and sand, the growth of two brown seaweeds is restricted owing to the lack of a solid substrata. While Undaria pinnatifida and Sargassum muticum have colonized only some areas of the lagoon in a short vertical range (from 0 to -3 m), Antithamnion pectinatum is present on the three portmouths, along the inner shores of the city of Venice, and in the lagoon islands with extensive vertical distribution (from +0.2 to -8 m).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003437105147
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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