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  • 1
    Digitale Medien
    Digitale Medien
    Fast determination of nitrate in small samples of rain and surface waters by means of uv spectrophotometry and flow-injection analysis (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 289 (1978), S. 38-40 
    Details
    ISSN: 1618-2650
    Schlagwort(e): Best. von Nitrat in Wasser ; Spektralphotometrie, UV ; flow-injection, 0,5 ml-Proben
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Summary An UV-spectrophotometric determination of NO¯3 in small samples (0.5 ml) of rain and surface waters is described. A variant of flowinjection analysis is used in combination with an active carbon filter for removal of organic interferences. The accuracy and the reproducibility of the method are generally better than 3%. One determination takes 30 s.
    Notizen: Zusammenfassung Eine Methode zur Nitratbestimmung in Proben von 0.5 ml mittels eines UV-spektralphotometrischen Verfahrens in Kombination mit der „flow-injection“ Methode und einem Filter zur Beseitigung organischer Substanzen wird vorgeschlagen. Die Genauigkeit und Reproduzierbarkeit sind meistens besser als 3%. Eine Bestimmung fordert einen Zeitaufwand von 30 s.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00449237
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Supramaximal cycle tests do not detect seasonal progression in performance in groups of elite speed skaters (1992)
    Springer
    European journal of applied physiology 64 (1992), S. 292-297 
    Details
    ISSN: 1439-6327
    Schlagwort(e): Aerobic power ; Anaerobic power ; Training
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Seven female and eight male elite junior skaters performed cycle ergometer tests at four different times during the 1987/1988 season. The tests consisted of a Wingate-type 30-s sprint test and a 2.5-min supramaximal test. The subjects were tested in February, May and September 1987 and in January 1988. Maximal oxygen consumption was measured during the 2.5-min test. With the exception of the maximal oxygen consumption of the women in May which was about 6% lower than in the other three tests, no seasonal changes in the test results could be observed —this, in spite of a distinct increase in training volume (from 10 to more than 20 h · week−1) and training intensity in the course of the season. When the test data were compared to those of elite senior skaters, it appeared that the junior skaters showed the same values for mean power output during the sprint test [14.2 (SD 0.4) W · kg−1 for the men and 12.6 (SD 0.5) W · kg−1 for the women] and maximal oxygen consumption [63.1 (SD 2.8) ml· kg−1 · min−1 for the men and 55.3 (SD 3.5 ml · kg−1 · min−1 for the women, respectively] as found for senior skaters. It seemed, therefore, that the effects of training in these skaters had already levelled off in the period before they participated in this investigation. In contrast to previous studies, no relationship could be shown between the test results and skating performance. This was most likely due to the homogenous character of the groups (mean standard deviations in power and oxygen consumption were only 5%). It was concluded that the present cycle tests used to measure aerobic and anaerobic power were obviously not of use in evaluating seasonal changes in performance in these groups of highly trained athletes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00636214
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