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  • 1
    Electronic Resource
    Electronic Resource
    Separation of heavy metals by high-speed countercurrent chromatography (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 2225-2228 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00065a010
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  • 2
    Electronic Resource
    Electronic Resource
    Simulation of stochastic differential equations (1993)
    Springer
    Annals of the Institute of Statistical Mathematics 45 (1993), S. 419-432 
    Details
    ISSN: 1572-9052
    Keywords: Numerical solution ; stochastic differential equations ; error analysis ; order of convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A lot of discrete approximation schemes for stochastic differential equations with regard to mean-square sense were proposed. Numerical experiments for these schemes can be seen in some papers, but the efficiency of scheme with respect to its order has not been revealed. We will propose another type of error analysis. Also we will show results of simulation studies carried out for these schemes under our notion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773344
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and characterization of thiosalicylic acid selenotrisulfide (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 348 (1994), S. 776-777 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Thiosalicylic acid selenotrisulfide(SeT) was prepared by the reaction of thiosalicylic acid and selenious acid in methanol. The precipitated SeT was partially purified by an extensive washing with methanol and pure SeT was isolated by preparative high-performance liquid chromatography (HPLC) using a reverse phase column. The HPLC method was useful both in the analysis and the isolation of SeT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323706
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  • 4
    Electronic Resource
    Electronic Resource
    Moment analysis of drug disposition in kidney. V:In Vivo transepithelial transport ofp-aminohippurate in rat kidney (1991)
    Springer
    Journal of pharmacokinetics and pharmacodynamics 19 (1991), S. 51-70 
    Details
    ISSN: 1573-8744
    Keywords: transepithelial transport ; moment analysis ; renal excretion ; tubular secretion ; mean residence time ; recirculation pharmacokinetics ; p-aminohippurate ; probenecid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new method that can assess the kinetics of in vivotransepithelial transport in rat kidney has been established. The method is based upon a multiple-indicator dilution experiment and the moment analysis theory. After simultaneous bolus injections of p-aminohippurate (PAH) and inulin into the right renal artery, blood samples were taken from the carotid artery and urine was separately collected from right and left ureters. The characteristic response for the first passage of drugs through the right kidney was evaluated by taking blood circulation into consideration. To determine the mean artery-tovein transit time and the extraction ratio in the kidney, an intravenous injection was also performed as a reference experiment for deconvolution. The urinary excretion curve corresponding to the first passage was obtained as the difference between both kidneys. The mean artery-tolumen transit time (mean transepithelial transit time, ¯T cell )was computed by subtracting the mean urinary transit time of inulin from that of secreted PAH. Sinc transport across the luminal membrane into the lumen from tubular epithelial cells can influence the cellular residence time of drugs, ¯ Tcell and the single-pass mean residence time in epithelial cells (¯T cell.sp )can be thought of describing luminal membrane transport. The value of ¯T cell obtained for 0. t mM PAH was 22 sec and it was prolonged to 61 sec in the presence of probenecid, suggesting an inhibitory effect on transport across the luminal membrane. On the other hand, antiluminal membrane transport into cells from blood is characterized by the volume of distribution in the kidney (Vd PAH ). Vd PAH was remarkably decreased by treatment with probenecid, indicating an inhibitory effect on antiluminal membrane transport. The effects of probenecid on both sides of epithelial cell membrane transport were first demonstrated in vivo.The present method is useful for the analysis of in vivotransepithelial transport including antiluminal and luminal membrane transport for drugs excreted via tubular secretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01062192
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of micellar structure on solubilization ofn-octane andn-octanol (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 774-779 
    Details
    ISSN: 1435-1536
    Keywords: Solubilization ; micellar structure ; n-octane ; n-octanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The solubilization ofn-octane andn-octanol in nonionic micelles of octaethylene glycoln-alkyl ethers was investigated by means of various techniques including solubilization, fluorescence, and dynamic light-scattering measurement. With respect to the effect of alkyl chain length of the surfactants, different solubilization behavior was observed betweenn-octane andn-octanol. That is to say, it was shown that the solubilization ofn-octane increases with an increase in the alkyl chain length, while that ofn-octanol decreases. An interpretation of these solubilization mechanisms is explained from the standpoint of the volume of hydrophobic and hydrophilic regions in a micelle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00660094
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  • 6
    Electronic Resource
    Electronic Resource
    The progression of retinopathy of prematurity and fluctuation in blood gas tension (1993)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 231 (1993), S. 151-156 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study, the relationship between the fluctuation in blood oxygen and carbon dioxide tension and the progression of acute retinopathy of prematurity (ROP) was evaluated. Eighteen extremely premature infants were selected on the basis of the following criteria: gestational age less than 26 weeks, oxygen supply or mechanical ventilation for more than 50 days, transcutaneous oxygen pressure (TcPO2) recorded almost once per hour, and arterial oxygen pressure (PaO2) and arterial carbon dioxide pressure (PaCO2) measured intermittently, for over 8 weeks after birth. All of these infants developed ROP, which ceased progressing in 7 infants (group 1, stage 1 or 2 ROP, international classification), but advanced in 11 (group 11, stage 3 or 3+). The fluctuations in TcPO2, PaO2, and PaCO2 are represented as coefficients of both variation (CV) and mean difference (D) in these two groups. The results demonstrate that both the CV and D values of TcPO2 are significantly elevated in group II infants compared with group I infants, in the first and second 3-weeks periods, and over the entire 9-week period after birth. The incidences of extreme hyperoxemia (TcPO2 ≧ 100 mm Hg) and hypoxemia (TcPO2 〈 30 mm Hg) in recorded TCPO2 time series show no significant differences between these two groups. We conclude that extremely premature infants with widely fluctuating arterial oxygen tension may have a greater chance of developing progressive ROP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00920938
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular shape recognition of polycyclic aromatic hydrocarbons with a liquid-crystal bonded phase in supercritical fluid chromatography (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 417-422 
    Details
    ISSN: 1040-7685
    Keywords: molecular shape recognition ; PAH ; liquid crystal ; SFC ; LC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chromatographic characteristics of a liquid crystal bonded phase have been evaluated for the separation of polycyclic aromatic hydrocarbons (PAHs), especially focusing on its shape recognition capability in supercritical fluid chromatography (SFC). The results clearly indicate that the phase has a stronger molecular planarity and shape recognition capability than typical polymeric and monomeric octadecylsilica (ODS) phases because of the very ordered bonded phase structure. The recognition capability was slightly dependent on SFC conditions such as column pressure, column temperature, and mobile phase density. Modifier addition did not make a large difference on the recognition capability. The phase seems to be a very promising stationary phase in SFC because the recognition capability is slightly influenced by the SFC conditions. Selectivity enhancement for molecular shape and planarity recognition has been found in SFC compared to reversed-phase LC separations with the same stationary phase.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220030506
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  • 8
    Electronic Resource
    Electronic Resource
    Separation of C60 and C70 fullerenes on methoxyphenylpropyl bonded stationary phases in microcolumn liquid chromatography (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 5 (1993), S. 135-140 
    Details
    ISSN: 1040-7685
    Keywords: microcolumn LC ; fullerenes ; methoxyphenylpropyl bonded phases ; molecular modeling ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chromatographic separation of C60 and C70 fullerenes was performed with phenylpropyl and three different methoxyphenylpropyl bonded phases in microcolumn liquid chromatography. The results indicate that the 3,4-dimethoxyphenylpropyl phase possesses the best resolving power among the evaluated phases, producing a separation factor of 1.87 for C70 and C60 using n-hexane as the mobile phase. This observation could be explained by examining the energy minimized conformations of the bonded phases and their associative interactions with the fullerene molecules.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220050208
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