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排序方式: 共有173条查询结果,搜索用时 15 毫秒
41.
Brassinosteroids protect photosynthetic machinery against the cadmium induced oxidative stress in two tomato cultivars 总被引:2,自引:0,他引:2
The present study was conducted with an aim to gain better insight of brassinosteroid generated response on the effects of cadmium on photosynthetic machinery and active oxygen metabolism in two tomato cultivars (K-25 and Sarvodya). These tomato cultivars were subjected to graded cadmium levels in soil (0, 3, 6, 9 or 12 mg kg−1 soil) with their foliage being sprayed with 0 or 10−8 M of 28-homobrassinolide/24-epibrassinolide (HBL/EBL) at 59 d stage. The results suggested that photosynthetic parameters, leaf water potential and activity of several enzymes (nitrate reductase and carbonic anhydrase) decreased significantly in both the cultivars, to a lesser extent in K-25 than Sarvodya with the increasing levels of cadmium in the soil. However, the activity of antioxidant enzymes and proline content increased in response to metal treatment as well as the application of brassinosteroids (HBL/EBL). Overall, exogenous application of brassinosteroids improved the activity of photosynthetic machinery and that of antioxidant defense system in both the cultivars, and also nullified the damaging effect of metal on these parameters. 相似文献
42.
A. Rasem Hasan Ligang Hu Lynne Fieber Timothy G. Townsend 《Environmental pollution (Barking, Essex : 1987)》2010,158(5):1479-2604
Earlier studies documented the loss of wood preservatives from new wood. The objective of this study was to evaluate losses from weathered treated wood under field conditions by collecting rainfall leachate from 5 different wood types, all with a surface area of 0.21 m2. Wood samples included weathered chromate copper arsenate (CCA) treated wood at low (2.7 kg/m3), medium (4.8 kg/m3) and high (35.4 kg/m3) retention levels, new alkaline copper quat (ACQ) treated wood (1.1 kg/m3 as CuO) and new untreated wood. Arsenic was found to leach at a higher rate (100 mg in 1 year for low retention) than chromium and copper (<40 mg) in all CCA-treated wood samples. Copper leached at the highest rate from the ACQ sample (670 mg). Overall results suggest that metals' leaching is a continuous process driven by rainfall, and that the mechanism of release from the wood matrix changes as wood weathers. 相似文献
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Hasan Çabuk Muhammet Samet Kılıç Muhammet Ören 《Environmental monitoring and assessment》2014,186(3):1515-1524
This research was carried out in the cities of Zonguldak and Eregli, which have been characterized as urban and industrial environments of the Western Black Sea Region, Turkey, in order to assess the contamination of polycyclic aromatic hydrocarbons (PAHs) using mosses as biomonitors. The methodology involved the collection of moss samples (Hypnum cupressiforme), ultrasonic extraction with dichloromethane, cleanup using silica gel and analysis by liquid chromatography with ultraviolet detection. The total PAH concentrations ranged from 78.1 to 1693.5 ng g?1 in Zonguldak and from 15.2 to 275.1 ng g?1 in Eregli. The total PAH concentration in Eregli was about six times lower than that in Zonguldak, revealing the importance of switching from coal to natural gas in residential heating. The diagnostic ratios and the correlation analysis have indicated that coal combustion and traffic emissions were the major PAH sources at both sites. The contour maps were constructed for the determination of spatial distributions of total PAHs, and it was shown for Zonguldak as well as for Eregli that the PAH pollution was much more predominant in highly populated regions. Moving away from the city centres, a gradual decrease in PAH pollution rates was observed. 相似文献
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Güngör Hasan Olanipekun Ifedolapo Olabisi Usman Ojonugwa 《Environmental science and pollution research international》2021,28(2):1464-1478
Environmental Science and Pollution Research - Considering the role democratic structures play in shaping the policies that enhance environmental quality, this paper tests the environmental Kuznets... 相似文献
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Rüstemoğlu Hasan 《Environmental science and pollution research international》2021,28(45):63933-63944
Environmental Science and Pollution Research - Turkey’s ecological footprint has recently been increasing, while its biocapacity has been decreasing. Furthermore, the country’s CO2... 相似文献
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Nizamoğlu Hasan Turan Mehmet Deniz 《Environmental science and pollution research international》2021,28(39):54811-54825
Environmental Science and Pollution Research - This study, which covered a set of leaching processes at a few stages, investigated the inclusion of iron found in mill scale, which is a waste of the... 相似文献