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  • 1990-1994  (11)
  • 1985-1989
  • 1980-1984
  • 1960-1964
  • 1990  (11)
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  • 1990-1994  (11)
  • 1985-1989
  • 1980-1984
  • 1960-1964
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Local effects on tidal strain measurements at Esashi, Japan (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 102 (1990), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Finite element modelling has been used to make a quantitative investigation of local factors affecting the measurement of tidal strain at the Esashi earth tide station. Factors investigated, with the approximate magnitude of the perturbation produced by each, are topography (12 per cent), regional geology (1 per cent), inhomogeneity of the elastic properties of the granodiorite from which the strainmeter tunnels were excavated (3 per cent), and the cavity effect (2 per cent). Correction for these factors reduces the average discrepancy between the observed strains (observational accuracy ~1 per cent) and those predicted from the solid earth and ocean loading tide from 23 to 8 per cent.After such correction the ratios of observed to modelled amplitudes of the O1 and M2 tides on each strainmeter are in fair agreement, but these ratios differ from strainmeter to strainmeter; they are about 7 per cent too large on the N-S and NE-SW strainmeters and 9 per cent too small on the E-W instrument. These studies illustrate the difficulties involved in relating strains measured in an observatory such as Esashi to those representative of the surrounding region and suggest that, with the level of detail and sophistication used, this relationship cannot be modelled to much better than 10 per cent. Systematic differences between results from the mid-point and free-end strainmeters imply that the effects of small-scale rock inhomogeneities have not been modelled correctly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1990.tb04577.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Lunar synchronization of spawning in cichlid fishes of the tribe Lamprologini in Lake Tanganyika (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 37 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Lunar synchronization of spawning was investigated for eight substrate brooding cichlid fishes belonging to the tribe Lamprologini. Their spawning activities all peaked during the second quarter of the lunar cycle. Comparison between their breeding styles and the degrees of spawning synchronization suggested that the nocturnal guarding-efficiency of eggs, especially exposed ones, is improved by the maximal amount of moonlight during full moon and, in species whose young leave the breeding sites about 2 weeks after spawning, the survival of dispersing young is enhanced by the darkness of moonless nights.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb05891.x
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  • 3
    Electronic Resource
    Electronic Resource
    In situ hybridization of muscle mitochondrial mRNA in mitochondrial myopathies (1990)
    Springer
    Acta neuropathologica 81 (1990), S. 1-6 
    Details
    ISSN: 1432-0533
    Keywords: In situ hybridization ; Mitochondrial DNA ; Mitochondrial myopathy ; Ophthalmoplegia ; Cytochromec oxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To determine whether a mitochondrial mRNA deficiency exists in mitochondrial myopathies, muscle biopsies from a patient with chronic progressive external ophthalmoplegia (CPEO) and a patient with mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS) were studied using in situ hybridization. Histochemistry and immunohistochemistry were performed along with hybridization. Hybridization reactions were widely distributed over the sarcoplasm of all muscle fibers in the patient with MELAS. In the patient with CPEO, 80% of the fibers showed a marked decrease in density of autoradiographic grains. This marked decrease corresponded to the histochemical and immunohistochemical findings of a very weak staining of cytochromec oxidase (CCO). The isotope-labeled cDNA probe used in in situ hybridization in this study complements a part of subunit I of CCO and a part of subunit II of complex I in the mitochondrial gene. Our results suggest a defect in the mRNA in this CPEO patient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662630
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  • 4
    Electronic Resource
    Electronic Resource
    Morphology and magnetic properties of ultrafine ZnFe2O4 particles (1990)
    Springer
    Applied physics 50 (1990), S. 13-16 
    Details
    ISSN: 1432-0630
    Keywords: 75.50.-y ; 76.80.+y ; 61.50.-f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Well-crystallized ultrafine ZnFe2O4 particles of several nanometers in size have been prepared by the coprecipitation method, and their particle morphology and magnetic properties, especially at low temperatures, examined. Room-temperature X-ray diffraction, transmission electron microscopy, magnetization measurements at various temperatures from 300 K to 4.2 K, and Mössbauer spectroscopy at various temperatures from 300 K to 4.2 K, and at 4.2 K with a longitudinal magnetic field of 16.4 kOe applied have been employed. The formation of short-range and long-range magnetic order in small ZnFe2O4 particles above and below approximately 30 K is discussed. Below 30 K, the appearance of spontaneous magnetization and its hysteretic property is confirmed for small ZnFe2O4 particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323947
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  • 5
    Electronic Resource
    Electronic Resource
    Removal of famotidine by haemodialysis in elderly anuric patients (1990)
    Springer
    European journal of clinical pharmacology 38 (1990), S. 313-314 
    Details
    ISSN: 1432-1041
    Keywords: famotidine ; anuric patients ; haemodialysis ; H2-receptor antagonist ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of haemodialysis on the pharmacokinetics of oral famotidine has been studied in five elderly anuric patients. Famotidine 20 mg was administered in a cross-over design to patients on and not on haemodialysis. The elimination rate constant of haemodialysis (k) was 4.6-fold larger than the systemic elimination rate constant (ke). Although the mean maximum serum concentration of famotidine during haemodialysis (141.5 ng·ml−1) was not significantly lower than that without haemodialysis (195.6 ng·ml−1), the AUC up to 5 h during haemodialysis was significantly decreased to 58.1% of the value without it. The data suggest that famotidine is dialysable by haemodialysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315039
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  • 6
    Electronic Resource
    Electronic Resource
    A study of magnetic properties of compacted amorphous powder cores (1990)
    Springer
    Journal of materials science 1 (1990), S. 39-45 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Magnetic properties of compacted cores which are formed from amorphous alloy powders prepared by a rapid quenching water atomization process are studied. The coercivity of the as-compacted core was estimated to beH c=0.028(λσ/I s)+1200 with the idea that the coercive force depends on the magnitude of the stress variation. The a.c. magnetic properties are remarkably improved by use of the coupling agent and zinc stearate. The use of the amorphous powder core for choke coils of switching power supplies leads to the decrease of cut-off current, that is, an improvement in the efficiency of power supplies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716015
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  • 7
    Electronic Resource
    Electronic Resource
    Crystallization of Fe80P13C7 amorphous alloy powder (1990)
    Springer
    Journal of materials science 9 (1990), S. 652-654 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00721793
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  • 8
    Electronic Resource
    Electronic Resource
    Corrosion of S3N4 and sialons in V2O5 melts (1990)
    Springer
    Journal of materials science 25 (1990), S. 1231-1236 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Si3N4 based ceramics such as hot isostatically pressed Si3N4, hot pressed Si3N4, hot pressed sialons containing 0, 30, 60 and 100% ofα phase were corroded by V2O5 melts at 700 to 1000
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585429
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature dependence of the mixed-valence state of57Fe-atoms produced in57Co-Labelled oxo-centered trinuclear iron acetate complexes (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 144 (1990), S. 195-202 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Emission Mössbauer spectra of mixedvalence trinuclear complexes,57Co-labelled [CoFe2O(CH3CO2)6(H2O)3] and [CoFe2O(CH3CO2)6 (py)3]py were compared with that of [CoCr2O(CH3CO2)6 (py)3]py. It was found that the57Fe atoms produced in57Co-labelled [CoFe2O(CH3CO2)6(H2O)3] and [CoFe2O(CH3CO2)6 (py)3]py showed a temperature-dependent mixed-valence state as observed in the absorption Mössbauer spectra of [Fe3O(CH3CO2)6 (H2O)3] and [Fe3O(CH3CO2)6 (py)3]py, respectively, while57Co-labelled [CoCr2O(CH3CO2)6 (py)3]py showed a temperature-independent divalent iron/II/ state. The results indicate that the decayed atoms keep their position at the sites of original57Co atoms and that the valence electrons are transferred through the intramolcular bondings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02218163
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  • 10
    Electronic Resource
    Electronic Resource
    Cation exchange selectivity of some fission products on strongly acidic cation exchanger of sulfonic acid type-nitric acid system (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 139 (1990), S. 79-87 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Distribution coefficients of fission products in nitric acid for strongly acidic cation exchanger of sulfonic acid type with different cross-linking and structure were measured by a column method. Uptake of cationic fission products increases with resin cross-linking and decreases of nitric acid concentration. The distribution coefficient of the ion, [KdMn+]*, in a given system is expressed as log [KdMn+]*=B·log[KdMn+]+A where [KdMn+] is the distribution coefficient of the ion at 1M nitric acid for 10% crosslinked gel type cation exchanger, while A and B constants. Deviation from the above relation were observed for Y3+ and complex ions of ruthenium upward for macroporous type cation exchanger and downward for highly porous type cation exchanger. Upward deviation of Y3+ for 10% cross-linked gel type cation exchanger increased with concentration of nitric acid. Consequently, elution sequence varied from Y3+−Eu3+−Pm3+−Ce3++ at 1M nitric acid to Eu3+−Pm3+−Y3+−Ce3+ for the same cation exchanger at 2M nitric acid. The same elution sequence, Eu3+−Pm3+−Y3+−Ce3+, was observed for 8% cross-linked gel type cation exchanger and 10% cross-linking macroporous type cation exchanger at 1M nitric acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060454
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