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排序方式: 共有199条查询结果,搜索用时 234 毫秒
181.
182.
Michael Beck MD Susanne Braun Wiltrud Coerdt Eberhard Merz Elisabeth Young Adrian C. Sewell 《黑龙江环境通报》1992,12(12):1019-1029
A fetus with mucopolysaccharidosis type IV A (Morquio type A) is described. The family had one affected child exhibiting symptoms of classical Morquio A disease, and late in the subsequent pregnancy prenatal diagnosis was requested. At 23 weeks' gestation, moderate ascites was detected by detailed ultrasound scan and keratan sulphate was found in the amniotic fluid. The pregnancy was terminated by prostaglandin induction and the diagnosis of mucopolysaccharidosis type IV A was confirmed by demonstration of a deficiency of N-acetylgalactosamine-6-sulphate (GalNac-6-S) sulphatase in cultured amniotic cells and in post-mortem fibroblast cultures. The activities of β-galactosidase and arylsulphatase A were normal, ruling out Morquio disease type B and multiple sulphatase deficiency. These results indicate that mucopolysaccharidosis IV A (a disease that predominantly affects the skeletal system) may produce ascites in the fetus to such an extent that it can be detected by ultrasound. 相似文献
183.
Summary. Soil organisms in direct and indirect interaction with plant roots affect aboveground herbivores, likely by inducing different
plant responses. We investigated the combined effects of the root-knot nematode Meloidogyne incognita (in direct interaction with roots) and the endogeic earthworm Octolasion tyrtaeum (in indirect interaction with roots) on the performance of Brassica oleracea. Both earthworms and nematodes increased N uptake and shoot biomass of B. oleracea. Earthworm activity mobilized more soil N than litter N, and herbivory by nematodes tended to increase the microbial biomass
in soil. Only the structural class of sulphur containing glucosinolates was affected by the soil organisms. Earthworms decreased
glucoiberin concentrations in B. oleracea shoots. Glucoraphanin was affected by an interaction between earthworms and nematodes. 相似文献
184.
Maria do Socorro S. Pereira Eduardo Winter Jose Roberto Guimarães Susanne Rath Anne Hélène Fostier 《Environmental Chemistry Letters》2007,5(3):137-141
Here, we show a fast and sensitive method for the determination of inorganic arsenic in natural waters using differential
pulse cathodic stripping voltammetry. All the arsenite determinations were done in 2.0 mol L−1 HCl + 3.15 × 10−4 mol L−1 Cu(II) supporting electrolyte. 1 × 10−3 mol L−1 sodium thiosulphate was used as As(V) reducing agent. The detection limit was 0.5 μg L−1 for both species. The method has been applied to water samples collected in an arsenic-contaminated region of Brazil, in
particular, to verify the efficiency of the solar oxidation and removal of arsenic process applied to these waters. 相似文献
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Liisa Huttunen Pekka Niemelä Riitta Julkunen-Tiitto Susanne Heiska Riitta Tegelberg Matti Rousi Seppo Kellomäki 《Chemoecology》2008,18(2):85-98
Summary. We examined the effects of defoliation con-currently with elevated temperature and CO2 on some chemical and morphological characteristics in the leaves of silver birch seedlings (Betula pendula). We also analyzed the consequent changes in the palatability of leaves for adult blue alder leaf beetles (Agelastica alni). Under the different climatic treatments, the seedlings were subjected to three fertilizer treatments (0 kg, 130 kg and
270 kg N ha−1) and defoliation treatments (0%, 25% and 50% of the total leaf area). In each climatic treatment, fertilization increased
the nitrogen content in the leaves, but decreased total concentrations of soluble phenolics, detected by high-performance
liquid chromatography (HPLC), and insoluble condensed tannins. Defoliation, both independently and in combination with elevated
temperature and CO2, decreased the concentrations of the phenolics. Compared to the intact controls, the leaves of the defoliated seedlings were
smaller and tougher. Under elevated temperature, the beetles consumed a smaller amount of the leaves of plants subjected to
the high fertilization, while under ambient climatic conditions, fertilization increased the feeding. The total leaf consumption
was higher under the ambient climatic conditions than under elevated temperature, elevated CO2 or the combination of elevated temperature and CO2. 相似文献
189.
Hegyi Gergely Jenni-Eiermann Susanne Boross Nóra Garamszegi László Zsolt Laczi Miklós Kötél Dóra Krenhardt Katalin Jablonszky Mónika Markó Gábor Nagy Gergely Rosivall Balázs Szász Eszter Török János 《Behavioral ecology and sociobiology》2019,73(6):1-14
Behavioral Ecology and Sociobiology - Cooperation plays a crucial role in primate social life. However, the evolution of large-scale human cooperation from the cognitive fundamentals found in other... 相似文献
190.
Development of an analytical method for the determination of anthracyclines in hospital effluents 总被引:1,自引:0,他引:1
Little is known about the fate of cytostatics after their elimination from humans into the environment. Being often very toxic compounds, their quantification in hospital effluents may be necessary to individualise the putative magnitude of pollution problems. We therefore developed a method for the determination of the very important group of anthracyclines (doxorubicin, epirubicin, and daunorubicin) in hospital effluents. Waste water samples were enriched by solid phase extraction (concentration factor 100), analysed by reversed-phase high performance liquid chromatography (RP-HPLC), and monitored by fluorescence detection. This method is reproducible and accurate within a range of 0.1-5 micro g l(-1) for all compounds (limits of quantification: 0.26-0.29 micro g l(-1) ; recoveries >80%). The applicability of the method was proven by chemical analysis of hospital sewage samples (range: 0.1-1.4 micro g l(-1) epirubicin and 0.1-0.5 micro g l(-1) doxorubicin). Obtained over a time period of one month, the results were in line with those calculated by an input-output model. These investigations show that the examined cytostatics are easily detectable and that the presented method is suitable to estimate the dimension of pharmaceutical contamination originating from hospital effluents. 相似文献