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151.
Jens Botterweck Daniela Claßen Thordis Zegarski Christian Gottfroh Roshni Kalathoor Andreas Schäffer 《Journal of environmental science and health. Part. B》2013,48(2):69-78
Extracellular, oxidative soil enzymes like monophenol oxidases and peroxidases play an important role in transformation of xenobiotics and the formation of organic matter in soil. Additionally, these enzymes may be involved in the formation of non-extractable residues (NERs) of xenobiotics during humification processes. To examine this correlation, the fate of the fungicide 14C metalaxyl in soil samples from Ultuna (Sweden) was studied. Using different soil sterilization techniques, it was possible to differentiate between free, immobilized, and abiotic (“pseudoenzyme”-like) oxidative activities. A correlation between the formation of metalaxyl NER and soil organic matter content, biotic activities, as well as extracellular phenoloxidase and peroxidase activities in the bulk soil and its particle size fractions was determined. Extracellular soil-bound enzymes were involved in NER formation (up to 8% of applied radioactivity after 92 days) of the fungicide independently from the presence of living microbes and different distributions of the NER in the soil humic subfractions. 相似文献
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153.
Andreas Hoppe 《Natural resources forum》1992,16(3):232-234
The soils of the Amazon's rainforests, unlike soils in rainforests in other parts of the world, have very low productivity. Experiments have shown that the Amazon's timber productivity of 2–3 m3 per year per hectare is considerably below that achievable in Northern Europe. Sustainable agricultural development therefore can be expected to be very low. However, the mineral resources of the Amazon are very extensive and offer a way to develop the Amazon without destroying the ecology, provided that some limits are set on non-mining activities. 相似文献
154.
A major restructuring of the mining industry has been going on since the early 1980s. Using 11 important minerals this paper analyses the changing pattern of control in the mining industry for European based mining companies. In general, European mining companies have increased their control over mineral production worldwide while North American based companies have shown a decline in control of production. Production of European state-owned mining companies has declined as a result of privatization. 相似文献
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The Science of Nature - 相似文献
157.
Dr. Susanna Bunge Cordula Steglich Peter Lorenz Michael Beck Suying Xu John J. Hopwood Andreas Gal 《黑龙江环境通报》1994,14(9):777-780
Identification of iduronate-2-sulphatase (IDS) gene mutations in patients with mucopolysaccharidosis type II (MPS II, Hunter syndrome) allows fast and reliable carrier detection and prenatal diagnosis. We describe here three cases of prenatal diagnosis by direct detection of the gene mutation. In addition to two affected male fetuses from two different families, a 47,XXY fetus carrying both the normal and the mutant allele was diagnosed in a third family. The latter pregnancy was carried to term and the child is obviously not affected by MPS II. 相似文献
158.
Dr. Ulrich Gembruch Molly Chatterjee Rainer Bald Gerd Eldering Helga Göcke Andreas E. Urban Manfred Hansmann 《黑龙江环境通报》1990,10(4):211-217
A case of aortic atresia with insufficiency of mitral valve diagnosed prenatally at 33 weeks of gestation is presented. An accurate diagnosis of this fetal cardiovascular malformation was possible by application of Doppler colour flow mapping, which demonstrated (a) the absence of forward flow in the hypoplastic ascending aorta, (b) reverse flow of blood from the ductus arteriosus into the severely hypoplastic ascending aorta in the late systole, (c) pansystolic mitral valve regurgitation, and (d) absent flow across the foramen ovale as a result of premature closure of the foramen ovale. 相似文献
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