خيارات البحث
النتائج 261 - 270 من 333
Research Articles Metabolism of phenanthrene in cell suspension cultures of wheat and soybean as well as in intact plants of the water mossFontinalis antipyretica : A comparative study
1998
Schrenk, Christiane | Steinberg, Christian E. W.
The metabolism of phenanthrene was studied both in cell suspension cultures of wheat (Triticum aestivum) and soybean (Glycine max), and in intact plants of the water mossFontinalis antipyretica. Metabolism in cell suspension cultures strongly differed between the monocotyle and the dicotyle plant. Only small amounts oftrans-phenanthrene-9,10-dihydrodiole and phenanthrene-9,10-dione were detectable in the wheat culture. Soybean cultures, in contrast demonstrated a strong turnover resulting in a 75% reduction of the initial phenanthrene concentration. Metabolites were phenanthrene-9,10-dione, not further characterized polar metabolites and bound residues. Intact plants ofFontinalis antipyretica metabolized only small amounts of phenanthrene. Data obtained from cell cultures did not provide information for the metabolic potential in intact plants. Therefore standardized tests with model systems like suspension cultures lead to inadequate assessment of the ecological risk of certain xenobiotics.
اظهر المزيد [+] اقل [-]Distribution of platinum group elements (Pt, Pd, Rh) in environmental and clinical matrices: Composition, analytical techniques and scientific outlook : Status report
1998
Hees, Torsten | Wenclawiak, Bernd | Lustig, Sönnke | Schramel, Peter | Schwarzer, Michael | Schuster, Michael | Verstraete, Dominique | Dams, Richard | Helmers, Eckard
Trace concentrations of the platinum group elements (PGE; here: Pt, Pd and Rh) play an important role in environmental analysis and assessment. Their importance is based on 1. their increasing use as active compartments in automobile exhaust catalysts, 2. their use as cancer anti-tumor agents in medicine. Due to their allergenic and cytotoxic potential, it is necessary to improve selectivity and sensitivity during analytical investigation of matrices like soil, grass, urine or blood.This paper summarizes the present knowledge of PGE in the fields of analytical chemistry, automobile emission rates, bioavailibility, toxicology and medicine.
اظهر المزيد [+] اقل [-]Cyanogen accumulation in environment during processing of cassava (Manihot esculenta Crantz) for starch and sago
1998
Balagopalan, C. (Central Tuber Crops Research Inst., Trivandrum, Kerala (India). Div. of Crop Utilization and Biotechnology) | Rajalakshmy, L.
Determination of acidic pesticides in the drinking water of Greece using capillary gas chromatography mass spectrometry
1998
Tsipi, D. (General Chemical State Lab., Athens (Greece)) | Hiskia, A. | Heberer, T. | Stan, H.J.
Modelling acidification effects on coniferous forest soils
1998
Eriksson, E. (Uppsala Univ. (Sweden). Dept. of Geosciences)
Sulfate adsorption-desorption in a Swedish forest soil
1998
Gobran, G.R. (Swedish Univ. of Agricultural Sciences, Uppsala (Sweden). Dept. of Ecology and Environmental Research) | Selim, H.M. | Hultberg, H. | Andersson, I.
Arsenic in human and cow's milk: a reflection of environmental pollution
1998
Ulman, C. (Dokuz Eyluel Ueniv., Izmir (Turkey). Faculty of Medicine, Dept. of Biochemistry) | Gezer, S. | Anal, O. | Toere, I.R. | Kirca, U.
Absorption of heavy metals in wild berries and edible mushrooms in an area affected by smelter emissions
1998
Barcan, V.S. (Lapland Biospheric Reserve Zeleny, Monchegorsk (Russian Federation)) | Kovnatsky, E.F. | Smetannikova, M.S.
Element concentrations in Scots pine needles on radial transects across a subarctic area
1998
Rautio, P. (Oulu Univ. (Finland). Dept. of Biology) | Huttunen, S. | Lamppu, J.
Soluble carbohydrates and secondary phytochemicals in Betula as affected by SO(2)-pollution
1998
Lavola, A. (Joensuu Univ. (Finland). Dept. of Biology)
