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  • kinetics
  • Springer  (5)
  • Public Library of Science (PLoS)
  • 1975-1979  (5)
  • 1978  (5)
Collection
Keywords
Publisher
  • Springer  (5)
  • Public Library of Science (PLoS)
Years
  • 1975-1979  (5)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Kinetics and efficacy of theophylline in the treatment of apnea in the premature newborn (1978)
    Springer
    European journal of clinical pharmacology 13 (1978), S. 203-207 
    Details
    ISSN: 1432-1041
    Keywords: Theophylline ; kinetics ; apnea ; premature newborns ; developmental pharmacology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Aminophylline (theophylline-ethylenediamine) was administered to 27 premature newborns to prevent apneic spells. Of the 22 patients monitored for theophylline concentration, a therapeutic blood level was reached in 19 in 1–2 days, and 3 stayed below it. ‘Toxic’ blood levels (≥20 µg/ml) were reached in 3 cases, one of whom showed signs of toxicity. Theophylline treatment was not efficient in the prevention of apnea when a serious underlying disease was present. Theophylline blood half-life (mean : 27.0 h) and clearance (mean 12.9 ml/h/kg) confirmed the slow elimination pattern of the drug in the premature infant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609983
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  • 2
    Electronic Resource
    Electronic Resource
    High-temperature oxidation kinetics of Cu-Si alloys containing up to 4.75 wt.% Si in $$p_{{\text{O}}_{\text{2}} } $$ =0.01 atm and pure CO2 (1978)
    Springer
    Oxidation of metals 12 (1978), S. 323-329 
    Details
    ISSN: 1573-4889
    Keywords: Cu-Si alloys ; oxidation ; kinetics ; silica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of Cu-Si alloys (containing up to 4.75 wt. % Si) in $${\text{p}}_{O_2 } $$ =0.01 atm from 800 to 1000°C has been investigated using thermogravimetry and other techniques. A 0.04% Si alloy followed a parabolic oxidation law with a rate similar to that of pure Cu. As the Si concentration increased the rate decreased and became irregular owing to SiO2 particles or flakes at the alloy-scale interface. It is considered that sintering of SiO2 particles and rupture of the sinter because of contraction during sintering are responsible for the irregular kinetics. A SiO2 layer forms directly on the 4.75% Si alloy which oxidizes uniformly. The SiO2 was always amorphous. In pure CO2 a similar pattern of amorphous SiO2 particles, flakes, and layers occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00603576
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  • 3
    Electronic Resource
    Electronic Resource
    Oxidation of an Fe—19 wt. % Ni alloy in CO2 at 700–1000°C (1978)
    Springer
    Oxidation of metals 12 (1978), S. 215-225 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; Fe-Ni alloys ; kinetics ; scale morphology ; EPMA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation of an Fe—19.34 wt. % Ni alloy in dry CO2 has been studied at 700—1000°C using thermogravimetry, metallography, and EPMA. Weight gains for oxygen consumption followed a linear-parabolic-linear sequence at all temperatures. During the initial linear stage the scale consisted mainly of magnetite and the activation energy of 133±25 kJ · mole−1 is considered to be due to dissociation of CO2 into CO and adsorbed oxygen on the outer magnetite surface. During the parabolic oxidation stage a continuous Ni-rich layer containing ∼ 70% Ni forms a barrier to the diffusion which has an activation energy of 192±79 kJ · mole−1. The breakdown of the barrier layer causes a return to linear kinetics with an activation energy of 138±42 kJ · mole−1 for dissociation of CO2 on the outer surface. During the final linear stage there is pronounced general and intergranular subscale formation. Detailed information is presented of the Ni redistribution and concentrations during oxidation and its correlation with the kinetics and morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616097
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidation of Fe-C alloys at 500°C (1978)
    Springer
    Oxidation of metals 12 (1978), S. 67-82 
    Details
    ISSN: 1573-4889
    Keywords: oxidation ; Fe-C ; kinetics ; oxide grain size ; grain-boundary diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Fe-C alloys containing 0.1, 0.5, and 1.0% C were oxidized in 1 atm O2 at 500°C. Two specimen preparations were used: annealed followed by slow cooling to form coarse pearlite plus proeutectoid ferrite or cementite; and cold-worked by abrading after annealing. The cold-worked alloys oxidize more rapidly. Annealed pearlite oxidizes faster than annealed ferrite. The differences in oxidation rate are caused by differences in the Fe3O4 grain size, that is, by the number of oxide grain boundaries available to act as easy diffusion paths for the outward diffusion of Fe through the Fe3O4. The oxidation rate constant is 10 times larger for fine-grained poly crystalline oxide than for oxide in which the Fe3O4 is monocrystalline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609975
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  • 5
    Electronic Resource
    Electronic Resource
    Probenecid inhibition of methotrexate excretion from cerebrospinal fluid in dogs (1978)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 6 (1978), S. 389-397 
    Details
    ISSN: 1573-8744
    Keywords: probenecid ; methotrexate ; cerebrospinal fluid ; kinetics ; interaction ; dogs ; choroid plexus ; intrathecal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Probenecid is known to inhibit the renal excretion of methotrexate (MTX) and the transport of organic anions by the choroid plexus of the brain. The effect of probenecid on the CSF clearance of MTX given by the intrathecal route was examined in anesthetized dogs. Plasma and CSF MTX levels were measured following intrathecal injection of 0.4 mg/kg MTX, with and without pretreatment with probenecid. In the absence of probenecid, the peak plasma MTX concentration of 3.18×10−7±1.09×10−7 M (mean±SD) was reached 5 hr after intrathecal injection. With probenecid pretreatment, the mean peak plasma MTX concentration was lower (2.09×10−7+-0.98×10−7 M) and plasma disappearance was prolonged. A biexponential decay of CSF MTX levels was observed over the duration of sampling. The half-life of the second exponential phase was 21 hr without probenecid pretreatment and was longer after probenecid pretreatment. These results provide strong evidence that probenecid inhibits transfer of MTX from CSF to plasma following intrathecal injection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01062721
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