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501.
Dr. Georg Keckstein Sonja Tschurtz Volker Schneider Wolfgang Mütter Rainer Terinde Wolf-Dietrich Jonatha 《黑龙江环境通报》1990,10(1):59-65
Between October 1985 and February 1989, 49 ultrasound-guided intravascular fetal blood transfusions were performed in 16 patients (14 with rhesus (Rh) isoimmunization, 2 with non-immunologic hydrops fetalis (NIHF)). As an intra-operative complication, perivascular haematoma of the cord occurred in three patients (7 per cent). In two cases, fetal bradycardia necessitated delivery by Caesarean section at 30 and 32 weeks' gestation, respectively. In the third case, fetal bradycardia developed during transfusion, at 31 weeks' gestation, but normalized within 3 min. The baby was delivered as planned at 36 weeks of gestation, after another transfusion at 34 weeks. Dislodgement of the needle tip into perivascular tissue, caused by sudden fetal or maternal movements, is the reason for this complication. The haematoma develops as a result of delayed recognition and continuous transfusion into Wharton' s jelly. Cord haematoma may be diagnosed in time by continuous ultrasound imaging, as illustrated in case 3. To minimize the risk of needle dislodgement during transfusion, sedation of the mother and complete immobilization of the fetus by injecting a short-acting muscle relaxant into the umbilical vessel are recommended. 相似文献
502.
A case of a prenatally diagnosed fetal ovarian cyst is presented. The pregnancy was complicated only by polyhydramnios, and some degree of fetal bowel obstruction could be recognized on sonogram. The newborn was delivered vaginally in the 39th week of pregnancy, and the cyst was removed by laparotomy on the day of the delivery. The etiology of this rare fetal condition is unknown. 相似文献
503.
504.
Wolfgang Villwock 《Die Naturwissenschaften》1993,80(1):1-8
In the course of a long-term case study (since 1960) the interaction between different exotic fish (salmonids, atherinids) on the endemic ichthyofauna (genusOrestias: Cyprinodontidae) introduced to the interandean basin of Lake Titicaca was observed. The contribution deals not only with the actual consequences which endanger endemic species but also the socio-economic effects on the native Indian population, both causing further ecological problems in the region of concern. 相似文献
505.
506.
Wolfgang Loibl Stefan Smidt 《Environmental science and pollution research international》1996,3(4):213-217
Increased tropospheric ozone concentrations cause damage to both human health and the environment. To assess the exposure of forest areas and selected tree species to ozone, it is necessary to calculate the ozone exposure distribution. The present article describes the application of an ozone interpolation model to the calculation of the ozone exposure distribution in combination with forest inventory data. The exposure of forest regions to ozone was assessed by means of an AOT40 map (accumulated ozone exposure over a threshold of 40 ppb). The calculation was performed by hourly running of the model during the summer term and accumulation of the patterns that exceeded 40 ppb. The exposure of the primary Austrian tree species to ozone can be assessed due to the spatial relation of ozone exposure and tree species patterns. This spatial relation also allows the verification of assumptions concerning ozone-related tree damage. 相似文献
507.
Peter Thomas Julia Maerker Wolfgang Riedel Bernhard Przybilla 《Environmental science and pollution research international》1995,2(2):69-72
The relationship between immune defense mechanisms and environmental pollutants has been a focus of intensive research during the last decade. In animal experiments, diesel exhaust particles (DEP) have been shown to exert adjuvant effects on the IgE response against aeroantigens and to compromise broncho-pulmonary immune defense. Important target cells are monocytes/alveolar macrophages which display the important functions of phagocytosis, antigenpresentation and modulation of inflammatory processes. To further evaluate the influence of DEP upon these cells, we investigated whether exposure to suspended DEP would change the phagocytic capacity and the tumor necrosis factor alpha (TNF-α) release of human peripheral monocytes/alveolar macrophages. Our results demonstrated a dose-dependent reduction of phagocytosis (p < 0.001) and an additional increase of an ongoing TNF-α response (p < 0.005). These findings may help to link exposure to environmental pollutants to such biologic effects as increased susceptibility to broncho-pulmonary disease or facilitated sensitization against aeroallergens. 相似文献
508.
As part of the research project “information system for environmental chemicals” a factual databank on a testset of 68 chemicals was developed. The set-up of the databank is described and the analysis of the results is shown for benzo(k)fluoranthene using a graphical boxplot illustration. 相似文献
509.
Eight sediment samples collected between Hamburg and Cuxhaven were analysed for organic micropollutants. Using three different methods the following compounds were determined: α-HCH, γ-HCH, HCB, PCB, DDT-family, pentachlorobenzene and octachlorostyrene. 相似文献
510.
Analysis of chlorinated paraffins in cutting fluids and sealing materials by carbon skeleton reaction gas chromatography 总被引:2,自引:0,他引:2
Chlorinated paraffins (CPs) pose a major risk in the environment, due to their wide application, to their persistence, to their carcinogenic potential, and in view of the fact, that they cannot be easily identified. Various commercial cutting fluids and sealing materials were analysed for CPs with carbon skeleton reaction gas chromatography (GC) and flame ionization detection. CPs are simultaneously dechlorinated and hydrogenated to the corresponding alkanes with Pd catalyst material in the GC injector. With this method, the carbon chain length of commercial technical CPs was determined. In six of sixteen sealing materials we found five short and one medium chain length polychlorinated paraffins in percentages of 9-16% (w/w). In five cutting fluids we found predominantly medium to long chain length chloroparaffins with percentages of 2.5-31% (w/w), only one fluid contained short chain CPs. 相似文献