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Dias AP Dafré M Rinaldi MC Domingos M 《Environmental pollution (Barking, Essex : 1987)》2011,159(2):458-465
This study intended to determine whether the redox state in plants of Nicotiana tabacum ‘Bel-W3’ fluctuates in response to the environmental factors in a sub-tropical area contaminated by ozone (São Paulo, SE - Brazil) and which environmental factors are related to this fluctuation, discussing their biomonitoring efficiency. We comparatively evaluated the indicators of redox state (ascorbic acid, glutathione, superoxide dismutase, ascorbate peroxidase, and glutathione reductase) and leaf injury in 17 field experiments performed in 2008. The redox state was explained by the combined effects of chronic levels of O3 and meteorological variables 4-6 days prior to the plant sampling. Moderate leaf injury was observed in most cases. The redox state of tobacco decreases few days after their placement in the sub-tropical environment, causing them to become susceptible to oxidative stress imposed by chronic doses of O3. Its bioindicator efficiency would not be diminished in such levels of atmospheric contamination. 相似文献
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The traditional method of identifying wildlife habitat distribution over large regions consists of pixel-based classification
of satellite images into a suite of habitat classes used to select suitable habitat patches. Object-based classification is
a new method that can achieve the same objective based on the segmentation of spectral bands of the image creating homogeneous
polygons with regard to spatial or spectral characteristics. The segmentation algorithm does not solely rely on the single
pixel value, but also on shape, texture, and pixel spatial continuity. The object-based classification is a knowledge base
process where an interpretation key is developed using ground control points and objects are assigned to specific classes
according to threshold values of determined spectral and/or spatial attributes. We developed a model using the eCognition
software to identify suitable habitats for the Grasshopper Sparrow, a rare and declining species found in southwestern Québec.
The model was developed in a region with known breeding sites and applied on other images covering adjacent regions where
potential breeding habitats may be present. We were successful in locating potential habitats in areas where dairy farming
prevailed but failed in an adjacent region covered by a distinct Landsat scene and dominated by annual crops. We discuss the
added value of this method, such as the possibility to use the contextual information associated to objects and the ability
to eliminate unsuitable areas in the segmentation and land cover classification processes, as well as technical and logistical
constraints. A series of recommendations on the use of this method and on conservation issues of Grasshopper Sparrow habitat
is also provided. 相似文献
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dos Santos Debora Regina Lopes Silva-Sales Marcelle Fumian Tulio Machado Maranhão Adriana Gonçalves Malta Fábio Correia Ferreira Fernando César Pimenta Marcia Maria Miagostovich Marize Pereira 《Food and environmental virology》2023,15(1):21-31
Food and Environmental Virology - This study assessed the sources of contamination of water matrices in a rural area using detection of a host-specific virus (human adenovirus [HAdV], porcine... 相似文献
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The life-cycle impacts of five different 11 kV electrical power cables (three overhead lines and two underground cables) were analysed. These were compared by their embodied impacts in production and total lifetime operational impacts. The life-cycle results revealed there to be three key issues, the impacts of climate change, fossil fuel depletion, and particulate matter formation (PMF). The former two were of particular significance. The embodied impacts, which are those associated with the materials, were generally determined to be insignificant. The exception was for underground cables at low operating loads. Under these conditions PMF was more significant as a result of the high embodied impacts of the cables. Further analysis revealed that these impacts could be mitigated with an end of life material recovery program. At present the underground cables are not recovered, but if they were the recycling benefits would give rise to a notable improvement in PMF. For the other impact categories operational conductor losses were the dominant cause of impacts. In summary it was concluded that to minimise the life-cycle impacts of 11 kV cables the system with the lowest conductor resistance should be selected. 相似文献
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