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  • 1
    ISSN: 1432-0495
    Keywords: Effective porosity ; Specific yield ; Migration ; Tracer test ; Porosity ; Tritium ; Finite element method ; Longitudinal dispersivity ; Sedimentary rock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Effective porosity value was analyzed from the tritium concentration of sampled groundwater using a three-dimensional groundwater-flow and advection-dispersion code based on the finite element method. The effective porosity value was about 10%. Porosity values measured from core samples were 7–15%. The groundwater flow velocity estimated from the tritium concentrations was about 1 × 10−5 cm s−1. Therefore, during the low groundwater flow velocity condition, effective porosity and porosity values were the same. At the same test site, a 0.48% effective porosity value, determined by another tracer test injecting Br− solution into the aquifer during groundwater level change, was smaller than the porosity value when the flow velocity was 1.8×10−2 cm s−1. Thus the effective porosity value is concluded to be due to groundwater flow velocity. The specific yield value was calculated to be 0.6% by the total volume of tunnel seepage water and the total volume of the rock unsaturated during tunnel construction. However, as pore water continued to be drained after the groundwater level change was completed, the specific yield value became larger than 0.6%. Thus specific yield value is concluded to be due to drainage time.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0495
    Keywords: Key words Effective porosity ; Specific yield ; Migration ; Tracer test ; Porosity ; Tritium ; Finite element method ; Longitudinal dispersivity ; Sedimentary rock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Effective porosity value was analyzed from the tritium concentration of sampled groundwater using a three-dimensional groundwater-flow and advection-dispersion code based on the finite element method. The effective porosity value was about 10%. Porosity values measured from core samples were 7–15%. The groundwater flow velocity estimated from the tritium concentrations was about 1 × 10–5 cm s–1. Therefore, during the low groundwater flow velocity condition, effective porosity and porosity values were the same. At the same test site, a 0.48% effective porosity value, determined by another tracer test injecting Br– solution into the aquifer during groundwater level change, was smaller than the porosity value when the flow velocity was 1.8 × 10–2 cm s–1. Thus the effective porosity value is concluded to be due to groundwater flow velocity. The specific yield value was calculated to be 0.6% by the total volume of tunnel seepage water and the total volume of the rock unsaturated during tunnel construction. However, as pore water continued to be drained after the groundwater level change was completed, the specific yield value became larger than 0.6%. Thus specific yield value is concluded to be due to drainage time.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Child's nervous system 14 (1998), S. 69-73 
    ISSN: 1433-0350
    Keywords: Key words Dural cyst ; Intracranial cyst ; Congenital
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Intracranial dural cyst is a very rare congenital malformation. The presence of such a cyst was confirmed by means of computed tomography and magnetic resonance findings in a child with an enlargement of the head and developmental retardation and confirmed histologically in surgically obtained specimens of cyst wall.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2072
    Keywords: Key words MPTP ; MPP+ ; α1-Microglobulin ; Ulinastatin ; Mouse urine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Striatal dopamine contents in C57BL/6J mice were reduced at 24 h after intracerebroventricular (ICV) administration of 1-methyl-4-phenyl-1,2, 3,6-tetrahydropyridine (MPTP) or 1-methyl-4-phenylpyridinium (MPP+) in a dose-dependent manner. A dose of 1.8 μg MPP+ significantly (P 〈 0.05) suppressed the dopamine contents, whereas a similar dose of MPTP did not. A definite positive correlation between urinary contents of α1-microglobulin (α1M) and ulinastatin (UT) existed in normal mice. However, this correlation was nullified by ICV administration of 18 and 36 μg MPTP or 1.8 and 18 μg MPP+. With 1.8 μg MPTP, a positive correlation between urinary contents of α1M and UT was displayed. The urine volume, creatinine content, glomerular filtration rate, α1M and UT contents, and α1M/UT ratio of urine collected for 24 h post-ICV administration of MPTP or MPP+, were not statistically different from those of control mice. Our findings suggest that the central effects of MPP+, a neurotoxic metabolite of MPTP, nullify the positive correlation between urinary contents of α1M and UT without affecting renal functions.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0533
    Keywords: Key words Myotonic dystrophy ; Dorsal raphe nucleus ; Superior central nucleus ; Hypersomnia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A quantitative study of neurons in the dorsal raphe nucleus (DRN) and the superior central nucleus (SCN) was performed in seven patients with myotonic dystrophy (MyD), five of whom showed hypersomnia, and in eight age-matched controls. The densities of neurons in the DRN and the SCN were significantly lower in MyD patients with hypersomnia than in MyD patients without hypersomnia and control subjects. There was an appreciable positive correlation in the density of neurons between the DRN and the SCN in all MyD patients. These data suggest that the neuronal loss of the DRN and the SCN is associated with the presence of hypersomnia in MyD.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0533
    Keywords: Myotonic dystrophy ; Dorsal raphe nucleus ; Superior central nucleus ; Hypersomnia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A quantitative study of neurons in the dorsal raphe nucleus (DRN) and the superior central nucleus (SCN) was performed in seven patients with myotonic dystrophy (MyD), five of whom showed hypersomnia, and in eight age-matched controls. The densities of neurons in the DRN and the SCN were significantly lower in MyD patients with hypersomnia than in MyD patients without hypersomnia and control subjects. There was an appreciable positive correlation in the density of neurons between the DRN and the SCN in all MyD patients. These data suggest that the neuronal loss of the DRN and the SCN is associated with the presence of hypersomnia in MyD.
    Type of Medium: Electronic Resource
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