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排序方式: 共有454条查询结果,搜索用时 31 毫秒
161.
Murray Svidroňová Mária Mikušová Meričková Beáta 《Journal of Material Cycles and Waste Management》2022,24(6):2644-2655
Journal of Material Cycles and Waste Management - The European Union emphasises the need to sever the link between economic growth, resource consumption and waste production and has set targets to... 相似文献
162.
163.
Changes in soil pH, soil heavy metal forms, and the metabolic diversity of microbial communities were examined in soil samples collected in 1-mm increments from barley roots in soil contaminated with cadmium (Cd) and zinc (Zn) using a rhizobox system. Concentrations of exchangeable Cd and Zn increased near the roots owing to a decrease in soil pH. Conversely, the concentration of inorganically bound Cd and Zn decreased near the roots. Despite having the highest concentration of the most toxic exchangeable metals, the rhizosphere also had the highest bacterial and fungal metabolic activity and diversity when assessed using BIOLOG plates. Therefore, the promoting effects of root exudates on microbial activity could outweigh the adverse effects of Cd and Zn on microorganisms in the rhizosphere. 相似文献
164.
Duško Kančev Gašper Žerovnik Marko Čepin 《Journal of Loss Prevention in the Process Industries》2012,25(3):643-649
There is a growing interest in analyzing the possibility for current nuclear power plants operation extension. In that sense, life management programs, considering safety components ageing, are being developed and employed. On the other side, the large uncertainties of the ageing parameters as well as the uncertainties associated with most of the reliability data collections are widely acknowledged.This paper deals with uncertainty analysis associated with specific ageing rates database. The analysis is conducted using an analytical unavailability model applied for a selected safety system in a nuclear power plant. The most important problem is the immense uncertainty associated to the component ageing data sets as well as the lack of the very data in general, which would correspond to the more detailed modelling of ageing.New probability distributions, encompassing the ageing rates available in the considered data set, are suggested. The obtained results indicate the extent to which the uncertainty of the considered ageing data set, given the inherently assigned probability distribution, influences the performed unavailability calculations. Additionally, comparative analysis regarding the insights gained out of the application of the suggested probability distributions is conducted. 相似文献
165.
Hefecarboxylase und die Bildung von Phenylacetylcarbinol 总被引:1,自引:0,他引:1
166.
Many studies explore the feasibility of co-existence between genetically modified (GM) and conventional (non-GM) crops. An important research topic in these studies is the process of outcrossing, i.e., the process of gene flow via pollen flow from GM to non-GM crops. In this paper, we address a new modelling approach to define the environmentally driven processes of outcrossing for maize from existing empirical datasets. In particular, we use equation discovery methodology that combines background knowledge and empirical data from several studies. We induce models that predict the degree of outcrossing rate between the donor (GM) and the recipient (non-GM) maize field from the distance between the fields and the local wind characteristics (speed, direction and duration). This results in highly accurate models, for which both variables (distance and wind) are essential and of roughly equal importance. 相似文献
167.
Zupančič Marija Šušteršič Mojca Bavec Špela Gosar Mateja 《Environmental geochemistry and health》2021,43(9):3505-3531
Environmental Geochemistry and Health - One of the main sources of potential chronic exposure to potentially toxic elements is household dust, especially in an environment with known point sources... 相似文献
168.
Ričardas Taraškevičius Rimantė Zinkutė Laura Gedminienė Žilvinas Stankevičius 《Environmental geochemistry and health》2018,40(5):1817-1840
The research is based on analysis data of Cr, Cu, Mn, Ni, V, Zn (metals) and S in the hair of 47 girls and 63 boys from eight Vilnius kindergartens and the distribution pattern of high metal concentrations and bioavailability in snow-cover dust, also dust samples from vents of characteristic pollution sources. The kindergartens were selected according to topsoil total contamination index and dust-related indices. Significantly higher Cu, Mn, Ni and Zn concentrations in the hair of girls (means are 1.1, 1.9, 1.3, 1.2 times higher) and the differences between hair of genders according to inter-element correlation and clustering were found. Analysis of Spearman correlation coefficients between metal concentrations in hair of each gender and dust metal concentrations or metal loading rates at their residence sites revealed that for Mn, Cu and Zn, they are insignificant, while for Cr, Ni, Pb and V, they are mainly significant positive (except V in female hair). The correlation of the contents of Cr, Ni and V in dust with respective concentrations in hair was more significant for boys (p < 0.001) than for girls. Only a few cases with a significant Cr, Ni, Cu, Pb and Zn increase were revealed in hair of children attending polluted kindergartens in comparison with control. It was concluded that relationship between metal concentrations in hair and dust-related indices is more expressed for children’s residence sites than for their kindergarten sites. The gender-based grouping and site-by-site study design are recommended in the studies of reflection of environmental exposure in hair. 相似文献
169.
Lojpur Vesna Krstić Jelena Kačarević-Popović Zorica Filipović Nenad Validžić Ivana Lj. 《Environmental Chemistry Letters》2018,16(2):659-664
Environmental Chemistry Letters - Producing green and efficient energy sources is a major challenge. As a consequence, the use of photovoltaic devices for conversion of light into electricity is... 相似文献
170.
Małgorzata Piecha Mohamed Sarakha Polonca Trebše Drago Kočar 《Environmental Chemistry Letters》2010,8(2):185-191
In this study, stability of statin drugs in different conditions, such as various pH, diverse solvents ratio, presence of
UV, and sunlight have been investigated. Results suggest strong dependence of statins upon pH, potential environmental persistence
towards sun light, and UV light degradation via singlet excited state obtained by excitation into the π–π* band. In acidic conditions interconversion between lactone and hydroxy acid forms in aqueous solutions at room temperature
is retarded, while for the same sun-exposed samples are accelerated. Longer exposures lead to the degradation processes. Statin
interconversion in water is much lower than in acetonitrile. 相似文献