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排序方式: 共有78条查询结果,搜索用时 31 毫秒
11.
Jacinto Sá Dana Gasparovicova Konrad Hayek Erich Halwax James A. Anderson Hannelore Vinek 《Catalysis Letters》2005,105(3-4):209-217
Bimetallic Pd–Sn catalysts were synthesized by incipient-wetness impregnation of the metals on alumina and employed for the
reduction of nitrates from aqueous solutions. The catalysts were characterized by FTIR spectroscopy of adsorbed CO, X-ray
diffraction (XRD), transmission electron microscopy (TEM), and H2 chemisorption. The influence of the metal ratio was evaluated in reaction measurements. The bimetallic Pd–Sn catalysts exhibited
high selectivity for nitrate removal forming less NO2− and NH4+ than the Pd–Cu catalysts. 相似文献
12.
Radu Negru Liviu Marsavina Hannelore Filipescu Niculai Pasca 《International Journal of Fracture》2013,181(1):155-161
Using the asymmetric semi-circular bend specimen (ASCB) with vertical crack, a series of mixed mode I/II fracture tests were performed on two different rigid polyurethanes materials. The experimental results obtained for brittle fracture are compared with the theoretical predictions based on MTS and SED criteria. The results demonstrate that the SED criterion gives better results for mode II loading conditions, while for mode I and predominantly mode I both criteria are accurate. 相似文献
13.
Wolfgang Babisch Hannelore Neuhauser Michael Thamm Margarete Seiwert 《The Science of the total environment》2009,407(22):5839-5843
Objectives
The German Environment Agency carried out its fourth German Environmental Survey (GerES IV) from 2003 to 2006, which was especially for children. 1048 children, 8-14 years of age, were randomly selected from all over Germany. The sample is representative of children in this age group living in Germany with respect to gender, community size, and region.Methods
Blood pressure was measured under standardized conditions at clinical study centers. During home visits the children and their parents were asked about leisure activities, housing conditions and environmental factors, including traffic exposure of their homes. Orientating short-term noise measurements were carried out in front of the children's (bed-) room to validate the subjective ratings of the traffic volume (categories: no street, low, moderately, high/extremely high).Results
With respect to the subjective rating of “type of street” (traffic volume) the lowest blood pressure readings were found in children whose room was facing a street with ‘low traffic’. The highest readings were found in the group where the children's rooms were facing a street with a ‘high or extremely high traffic’ volume. The difference between the two groups was 1.8 mm Hg (95% CI: 0.1 to 3.5, p = 0.036) for systolic and 1.0 mm Hg (95% CI: − 0.4 to 2.4, p = 0.148) for diastolic blood pressure. With respect to the short-term noise measurements, significant blood pressure increases of 1.0 mm Hg (95% CI: 0.3 to 1.6, p = 0.004) and 0.6 mm Hg (95% CI: 0.1 to 1.2, p = 0.025), respectively, were found per 10 dB(A) increment of the noise level.Conclusions
The results show that road traffic noise at home is a stressor that could affect children's blood pressure. 相似文献14.
Fuchs D Dirscherl B Schroot JH Daniel H Wenzel U 《Molecular nutrition & food research》2006,50(1):58-69
Epidemiological studies suggest that soy consumption may provide a protection in the development and progression of atherosclerosis. It is under debate, however, whether the soy isoflavones or other compounds are the "active principle". As apoptosis is a driving force in the process of atherosclerosis, we tested whether a soy extract or a combination of the two predominant isoflavones genistein and daidzein, in concentrations as found in the extract, exert similar or different effects on apoptosis in EA.hy 926 endothelial cells after exposure to the endothelial stressor homocysteine. Plasma membrane disintegration and nuclear fragmentation served as relevant apoptosis markers. To assess whether the extract and the genistein/daidzein mixture differently affect cellular target proteins changed in amount by homocysteine treatment, proteome analysis was performed by two-dimensional gel-electrophoresis and peptide mass fingerprinting of regulated protein spots. Homocysteine induced apoptosis in the cells, and both extract and genistein/daidzein inhibited apoptosis to a comparable extent. Whereas the extract prevented for 10 proteins the changes in expression levels as caused by homocysteine, the genistein/daidzein mixture reversed the homocysteine effects on the proteome for 13 proteins. The cytoskeletal protein matrin 3 and a U5 snRNP-specific 40-kDa protein were the only protein entities where both extract and genistein/daidzein reversed the homocysteine-induced changes in a common way. In conclusion, our studies provide evidence that an isoflavone containing soy extract and isolated isoflavones, despite similar effects on inhibition of homocysteine-induced apoptosis in endothelial cells, affect a quite different spectrum of cellular target proteins. 相似文献
15.
16.
Electrode coatings for advanced alkaline water electrolysis were produced by applying the vacuum plasma spraying (VPS) process.
The characteristics of the used VPS equipment that were essential for the development of effective electrocatalytic electrode
layers are presented. Molybdenum-containing Raney nickel coatings were applied for cathodic hydrogen evolution, and Raney
nickel/Co3O4 matrix composite layers were developed for the anodic oxygen evolution reaction. For the preparation of Raney nickel coatings,
a precursor alloy such as Ni-Al was sprayed that had to be leached subsequently in caustic solution to remove the aluminum
content, forming a porous, high-surface-area nickel layer. The spray powders and the resulting VPS layers were studied by
metallography, x-ray diffraction (XRD), and scanning electron microscopy/energy dispersive analysis by x-ray (SEM/EDX). For
spraying of thermally sensitive oxide electrocatalysts (e.g., Co3O4), special process conditions involving plasma-chemical effects (reactive plasma spraying) had to be developed. The electrocatalytic
activity of the electrode coatings was investigated by performing polarization curves free of ohmic losses (IR-free) and long-term
tests under conditions of continuous and intermittent operation, which showed excellent electrochemical properties. 相似文献
17.
18.
Jatuporn?WittayakunEmail author Nurak?Grisdanurak Gerald?Kinger Hannelore?Vinek 《Korean Journal of Chemical Engineering》2004,21(5):950-955
Adsorption behavior of NO and CO as well as their reaction was investigated on cobalt supported zeolite beta (Co/BEA) prepared
by solid-state ion exchange (SSIE) and by impregnation (IMP). By temperature programmed desorption (TPD), two NO desorption
peaks at 100 and 260‡C were observed over both SSIE and IMP catalysts with complete desorption after 450‡C. CO desorbed from
SSIE catalyst between 50 and 200‡C. In the same temperature interval negligible CO2 desorption was observed, most likely due to reaction of CO with trace of cobalt oxides. Over IMP catalysts, desorption of
CO2 was found mainly at 500‡C. By comparing CO TPD profiles from physical mixtures of cobalt oxides and HBEA, SSIE catalysts
most likely contained cobalt cations in zeolite exchange position while IMP catalysts had cobalt in oxidic forms. The SSIE
catalysts were active for NO reduction at 400 and 500‡C with a maximum conversion at 500‡C. However, the activity in the presence
of water and oxygen was low. Water might inhibit the reaction by blocking active sites for NO and CO, while oxygen reacted
with CO to form carbon dioxide. The activity of SSIE was better than IMP catalyst. 相似文献
19.
20.
Bang DD Borck B Nielsen EM Scheutz F Pedersen K Madsen M 《Journal of food protection》2004,67(10):2171-2177
A total of 117 Campylobacter jejuni isolates from Danish turkeys were tested for the presence of seven virulence and toxin genes by PCR. One hundred seventeen (100%) isolates were positive for flaA, cadF, and ceuE gene primers. One hundred three (88%) isolates were positive for cdt gene cluster PCR detection (cdt gene cluster-PCR), whereas 101 (86.3%), 102 (87.2%), and 110 (94%) isolates were positive for cdtA-, cdtB-, and cdtC-PCR, respectively. Only 39 (33.3%) isolates were positive for virB11. Of 117 isolates, 114 (97.4%) produced cytolethal distending toxin (CDT) in Vero cell assays, 105 (89.7%) in Colon 205 assays, and 109 (93.2%) in chicken embryo cell assays. The CDT titers were determined in Vero cell assays. Of 117 isolates, 50 (42.7%) produced a CDT titer of 1:100, 29 (24.8%) of 1:50, and 27 (23%) of 1:5 to 1:10; 8 (6.8%) produced a CDT titer at undiluted supernatants and 3 (2.6%) produced no toxin. Twenty-nine C. jejuni isolates that were PCR negative for one or more individual cdt toxin genes also produced low or no CDT toxin. The high prevalence of the seven virulence and toxin genes demonstrates that these putative pathogenic determinants are widespread among Campylobacter isolates from turkeys and calls for further investigation for the elimination of Campylobacter infection in industrial turkey production and in industrial food chains. 相似文献