Die chemische und die elektrochemische Bestimmung des molekular gelösten Sauerstoffes der Binnengewässer

Ökologisch‐physiologische Untersuchungen zur Austrocknungs‐ und Temperaturresistenz an Fuaus vesiculosus L. der westlichen Ostsee

“…Die 0,-Messungen erfolgten im wesentlichen nach dem elektrochemischen Verfahren (zur Methode s. SCHRAMM 1966), teilweise nach dem Winkler-Verfahren (OHLE 1953, GRASSHOFF 1962 (ILJIN 1930(ILJIN , 1953 111. E r g e b ni sse d e r Resia t e n z u n t er s u c h u n g en…”

Trophic Structure and Productivity of Silver Springs, Florida

“…The various shortcuts used sacrificed some accuracy for speed although the errors introduced are far less than the large changes observed and the considerable minute to minute fluctuation as between successive duplicate samples. The Ohle (1953 \ method of running a control indicated that there \verc few interfering substances in Silver Springs watCJ· thus justifying the unmodified Winkler method (Table 1). w· ater taken from thP floor of the boi] was not significantly lower in oxygen than that at the surfact- (Table 1).…”

Influence of diet and temperature on physiological energetics ofChorus giganteus(Gastropoda: Muricidae) during reproductive conditioning

“…Individual snails were left for 1 h in sealed plastic chambers of 2.5 litre volume, while a second chamber without snails was used as a control. Water samples were taken from each experimental chamber and from the control and analysed using the Winkler method, modified by Ohle (1953). The oxygen consumed by each individual was estimated by the difference between the oxygen contained in the control and that contained in the experimental chambers over time periods of 60 min.…”