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  • 1985-1989  (7)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 59 (1987), S. 373-376 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 58 (1986), S. 1798-1803 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 60 (1988), S. 2301-2303 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1438-8359
    Keywords: Airway resistance ; Measurement ; General anesthesia ; airflow ; Lung volume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of lung volume and respiratory airflow on airway resistance were studied in five anesthetized and paralyzed patients. Airway resistance measured during the inspiratory phase with intermittent constant airflow inflatoins decreased in inverse correlationship to increases in lung volume. Airway resistance measured during the expiratory phase with an airway interruption technique, on the other hand, increased with a linear relationship to the expiratory airflow as expressed by a function of Y = K1 + K2X. K1, calculated from the values of airway resistance corresponding to three different airflows, was unaffected by intentional expiratory resistance loading. Thus, simultaneously with the measurement of airway resistance by this method, expiratory gas sampling with a Douglas bag can be done if necessary. Since the K2 value of the endotracheal tube used in this study (Portex® I.D. 8 mm, length 26 cm) was quite high (5.0 cmH2O·1−2·sec2), depending on the airflow, the presence of the endotracheal tube strongly affected the measurement of airway resistance during general anesthesia. K1 measured by the above method, however, may be considered as the best way to evaluate the lower airway resistance independent of either lung volume or expiratory airflow. (Sakai T, Yoshida H, Yano H et al.: Measurement of airway resistance in anesthetized and paralyzed subjects: proposal for evaluation of K1 values. J Anesth 2: 139–145, 1988)
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 326 (1987), S. 214-217 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The evaluation of dispersion in a FIA system, which is one of the indices of analytical sensitivity and separation, has been studied with an electrochemical detector and personal computer. Two different modes are applied to evaluate the degree of dispersion. One is a flat portion type mode, the other a hanging bell type mode. From these experiments it is possible to easily estimate the degree of dispersion in a FIA system concerning low dispersion (1 〈 D 〈 3) and medium dispersion (3 〈 D 〈 10), as discussed by Ruzicka and Hansen. Two regulation methods for sample volume in a FIA system are also discussed.
    Notes: Zusammenfassung Die Dispersion in einem Fließinjektionssystem, die für die analytische Empfindlichkeit und Trennung von Bedeutung ist, wurde nach zwei verschiedenen Methoden ausgewertet. Es ergab sich, daß der Dispersionsgrad im niederen (1 〈 D 〈 3) und mittleren Bereich (3 〈 D 〈 10) (entsprechend den Untersuchungen von Ruzicka und Hansen) leicht berechnet werden kann. Zwei verschiedene Regulierungsmethoden für das Probevolumen in einem FIA-System werden ebenfalls diskutiert.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 333 (1989), S. 19-22 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An electrochemical method for the specific determination of citric acid in sports drink and plaster using citrate lyase and oxaloacetate decarboxylase has been studied. The technique is reasonably rapid and simple to perform. Results from recovery experiments are excellent, i.e. recovery is 99.7±3.0% at a confidence limit of 95% (n=3), and reproducibility (R.S.D.) at 20 μmol/l citric acid is 1.46% (n=3). The method can possibly be used for monitoring citric acid in clinical and food-processing samples.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 322 (1985), S. 486-490 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A differential pulse-polarographic method has been studied for the determination of vanadium employing the catalytic maximum wave. A well-defined differential pulse polarographic peak is observed in the potential range from −0.2 to −0.7 V vs. SCE for vanadium(V) in 10 mmol 1−1 NaCl containing 10 mmol 1−1 acetic acid, 40 mmol 1−1 pyrocatechol, and 2.5 mmol 1−1 KBrO3. The peak current is very large and proportional to the concentration of vanadium(V) between 1×10−7 and 1×10−6 mol 1−1. The relative standard deviation at 0.5 μmol l−1 vanadium(V) was 2.06% (n=7). This method has been successfully applied to the determination of vanadium in standard materials such as pond sediment.
    Notes: Zusammenfassung Ein gut definierter differentialpuls-polarographischer Peak wurde für Vanadium(V) in 10 mmol/l NaCl-Lösung, die 10 mmol/l Essigsäure, 40 mmol/l Brenzcatechin und 2,5 mmol/l KBrO3 enthielt, beobachtet (Potentialbereich −0,2 bis −0,7 V gegen SCE). Der Peakstrom ist sehr groß und die Vanadiumkonzentration im Bereich von 1×10−7 bis 1×10−6 mol/l proportional. Die relative Standardabweichung betrug 2,06% (n=7) bei 0,5 μmol/l Vanadium(V). Das Verfahren wurde mit gutem Erfolg zur Vanadiumbestimmung in Standardproben (z.B. Teichsediment) eingesetzt.
    Type of Medium: Electronic Resource
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