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An analysis of the spatial trend of concentrations and of the correlation between heavy metals and total suspended matter was performed in a multidisciplinary study of transport of pollutants in the marine coastal area involving in situ investigations, remote sensing techniques and modeling. This paper presents results concerning the chemical behavior of heavy metals (Cu, Cd, Pb) in the North Adriatic Sea and in particular in the marine deltaic area of the Po river. The samples were collected during the JRC Remote Sensing Campaigns ADRIA 84 and ADRIA 85, carried out in the entire North Adriatic Sea and in the selected area in front of the Po when passing from the fluvial to the marine environment. In the dissolved phase, Cu undergoes a dilution process consistent with the mixing theory, while there is a tenfold increase in Pb concentrations. A pronounced tendency to augment the level in the dissolved phase is observed for all three elements in the pelagic waters. In the particulate phase, Cd and Cu, after a diminution in the nearshore stations, their concentration increases as the pelagic area is approached. The total amount of heavy metals in solid phase of the water decreases according to the dispersion and the sedimentation processes of the fluvial load in the marine water. A satisfactory correlation was found between the Cu and Pb with the total suspended matter (TSS). An attempt was made to characterize sediments and suspended matter in order to assess the role of the organic and mineralogical components on heavy metal behavior. 相似文献
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With the aim of optimizing the trapping ofHyphantria cunea (Drury) males through pheromones, the activity of various traps, doses of pheromone components and dispensers was investigated. The best degree of activity was obtained by funnel traps (Uni-traps) with high capture ability and satisfactory representation of the flight curve when the population of the moth is high. On the contrary, the sticky traps gave good results in low density population. Comparing the activity ofH. cunea to the pheromones, (3Z, 6Z, 9S 10R)-cis-9,10-epoxy-1,3,6-heneicosatriene (or TEP), (3Z, 6Z, 9S 10R)-cis-9,10-epoxy-3,6-heneicosatriene (or DEP) and linolenic aldehyde (or TAL), the results obtained showed different responses according to the areas considered. Blend 1∶1∶1 of DEP:TAL:TEP revealed better results in the Venezia area (north-east Italy), while the activity of the Japanese dispenser (2∶30∶1) was highest in the Novara area (north-west Italy); on the contrary no significant differences were noted in Bergamo, the middle area considered. These results denote that the Italian population ofH. cunea could be made up of different strains, introduced from different geographical areas, with the presence of pheromone dialects. 相似文献
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Developmental expression of glutathione-S-transferase in maize and its possible connection with herbicide tolerance 总被引：3，自引：0，他引：3
Mirella Sari-Gorla Silvia Ferrario Laura Rossini Carla Frova Marzio Villa 《Euphytica》1993,67(3):221-230
Summary Crop improvement for tolerance to specific herbicides is an important breeding target, since molecules performing well with regard to environmental safety are frequently not completely selective for crops. The glutathione (GSH)/glutathione-S-transferase (GST) system is a general mechanism of detoxification that in higher plants may confer tolerance to some herbicides. GSH level and GST activity were measured in different maize inbred lines, in the absence or in the presence of EPTC (a thiocarbamate) and of Alachlor (a chloroacetanilide); a wide genetic variability was observed for these parameters, which appear to be involved in plant tolerance to herbicides. Isozyme analysis was performed on roots, leaves, scutellum, pollen, coleoptile, mesocotyl of the same inbreds: it revealed the presence of many GST forms in maize, showing high polymorphism; they are controlled by at least five genes, the expression of which is developmentally regulated in the different tissues analyzed. 相似文献
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Bertrand Hirel Belinda Phillipson Erik Murchie Akira Suzuki Caroline Kunz Sylvie Ferrario Anis Limami Sylvain Chaillou Eliane Deleens Norbert Brugire Muriel Chaumont-Bonnet Christine Foyer Jean-Franois Morot-Gaudry 《植物养料与土壤学杂志》1997,160(2):283-290
In this paper we discuss the ways in which our understanding of the nature of the molecular controls of nitrogen assimilation has been increased by the use of non-leguminous and leguminous plants with genetically-altered capacities for ammonia assimilation. Using tobacco or Lotus as model plants, Glutamine synthetase (GS) and glutamate synthase (GOGAT) activities have been altered by stimulating or inhibiting in an organ- or tissue-specific manner the expression of the corresponding genes. In a few selected examples, the physiological impact of these genetic manipulations has been studied on plants grown under different nitrogen regimes. The use of such genetically-modified plants will allow us to better understand the molecular control of this metabolic pathway. It is also potentially of great importance in agriculture if such internal and stable modifications are beneficial in terms of nitrogen use efficiency, thus avoiding an excessive utilization of fertilizers or herbicides (GS inhibitors). Our current knowledge and prospects for future development are explored. 相似文献
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Lorber M Winters D Ferrario J Byrne C Greene C 《Journal of agricultural and food chemistry》2007,55(2):386-395
The United States Environmental Protection Agency (USEPA) has completed a survey of dioxin-like compounds (including 17 dioxin and furan (CDD/F) congeners and 12 coplanar polychlorinated biphenyl (PCBs) congeners) in dairy feeds from 10 dairy research facilities around the United States, sampling the overall mixtures and the major and minor feed components. Low levels of dioxin were found in all feed mixtures with an average concentration of 0.05 pg/g (ppt) toxic equivalent (TEQ) dry weight. This is lower than previously found in dairy feeds by about a factor of 4. While it is possible that generally lower levels of dioxins in the environment in recent years may explain this result, examinations of the data suggest that the oven drying used to prepare the wet feed samples could have resulted in a loss of dioxins from the feed materials. The percentage of the total TEQ due to CDD/Fs was about four times that of PCBs. Leafy vegetations in the feed (the silages and the hays) had concentrations about twice as high as nonleafy, protected vegetation of the feeds (the ground or meal corn, cottonseed, and others). Minor components did not significantly influence the final feed mixture concentration of dioxin TEQ. However, in one of the feed mixtures, a minor component with a high concentration of 38.5 ppt TEQ effectively doubled the concentration of the overall feed mixture. 相似文献
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Canedoli Claudia Ficetola Gentile Francesco Corengia Davide Tognini Paola Ferrario Andrea Padoa-Schioppa Emilio 《Landscape Ecology》2022,37(1):347-365
Landscape Ecology - A landscape is defined as a “system of ecosystems” and this is a model in which karst areas can easily be integrated. In karst areas, much of the connectivity... 相似文献
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