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1. The uptake of heavy metals via the alimentary tract can be an important factor for the metal budget of fish. 2. Concepts such as biomagnification, bioaccumulation, biotransference, or concentration factors, convey little information about the real threat originating from heavy metals in an aquatic food chain. 3. In polluted aquatic ecosystems the(More)
sample were accurate, separate aliquots of each extract with P-glucoisomerase included or omitted were assayed and the derived concentration values for glucose itself and fructose itself were calculated by subtracting mean sucrose values obtained from similar samples. Thus, the precision of the derived data for glucose and fructose concentration was(More)
1 which includes a free-swimming swarmer and a sessile loricate form (Fig. 1 a) [1, 2]. As the swarmer metamorphoses into the morphologically different sessile stage, a lorica is formed by exocytosis of precursors which are moulded by the ciliate [3]. The main constituents of the lorica are organic, i.e., chitin, pigments and mucous material [3, 4].(More)
The epidermal uptake of Pb, Cd, and the essential element Zn by tubificid worms was investigated. The animals were starved and contaminated via the water column at 4°C and 25°C. Atomic absorption spectroscopy (AAS), energy-dispersive X-ray microanalysis (EDX), laser induced mass analysis (LAMMA), electron microscopy, and the sulfide-silver method at the(More)
Two “Bremerhaven caissons” were used to investigate the interactions of cadmium (Cd) with sea water, particulate matter, sediments, suspended particular matter (SPM), and organisms in enclosed sea water-sediment systems, on the tidal mud flats of Jade Bay (FRG). One caisson was artificially contaminated by continuously injecting cadmium (as a chloride) so(More)
Overuse of nitrogen (N) fertilizer constitutes the major issue of current crop production in China, exerting a substantial effect on global warming through massive emission of greenhouse gas (GHG). Despite the ongoing effort, which includes the promotion of technologically sophisticated N management schemes, farmers' N rates maintain at excessive rates.(More)
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