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61.
Modified clay (MC), an effective material used for the emergency elimination of algal blooms, can rapidly reduce the biomass of harmful algal blooms (HABs) via flocculation. After that, MC can still control bloom population through indirect effects such as oxidative stress, which was initially proposed to be related to programmed cell death (PCD) at molecular level. To further study the MC induced cell death in residual bloom organisms, especially identifying PCD process, we studied the physiological state of the residual Prorocentrum donghaiense. The experimental results showed that flocculation changed the physiological state of the residual cells, as evidenced by growth inhibition and increased reactive oxygen species production. Moreover, this research provides biochemical and ultrastructural evidence showing that MC induces PCD in P. donghaiense. Nuclear changes were observed, and increased caspase-like activity, externalization of phosphatidylserine and DNA fragmentation were detected in MC-treated groups and quantified. And the mitochondrial apoptosis pathway was activated in both MC-treated groups. Besides, the features of MC-induced PCD in a unicellular organism were summarized and its concentration dependent manner was proved. All our preliminary results elucidate the mechanism through which MC can further control HABs by inducing PCD and suggest a promising application of PCD in bloom control. 相似文献
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污泥综合处理技术系统的可行性分析 总被引:3,自引:1,他引:3
通过对污泥处理技术现状与污泥组成的分析,认为降低污泥的含水率是改善污泥可处理性的关键。以机械脱水加工热干燥过程可达到充分降低污泥含水率的目的。以此为主干所形成的污泥综合处理系统经能量与经济平衡分析,发现其能量输出大于输入,经济成本合理,有一定的技术经济可行性。 相似文献
64.
Yuanhang Zhang Yuesi Wang Xin Jin Zirui Liu Gehui Wang Guiqian Tang Keding Lu Bo Hu Shanshan Wang Guohui Li Xinqin An Chao Wang Qihou Hu Lingyan He Fenfen Zhang 《环境科学学报(英文版)》2023,123(1):350-366
Atmospheric oxidizing capacity (AOC) is an essential driving force of troposphere chemistry and self-cleaning, but the definition of AOC and its quantitative representation remain uncertain. Driven by national demand for air pollution control in recent years, Chinese scholars have carried out studies on theories of atmospheric chemistry and have made considerable progress in AOC research. This paper will give a brief review of these developments. First, AOC indexes were established that represent apparent atmospheric oxidizing ability (AOIe) and potential atmospheric oxidizing ability (AOIp) based on aspects of macrothermodynamics and microdynamics, respectively. A closed study refined the quantitative contributions of heterogeneous chemistry to AOC in Beijing, and these AOC methods were further applied in Beijing-Tianjin-Hebei and key areas across the country. In addition, the detection of ground or vertical profiles for atmospheric OH·, HO2·, NO3· radicals and reservoir molecules can now be obtained with domestic instruments in diverse environments. Moreover, laboratory smoke chamber simulations revealed heterogeneous processes involving reactions of O3 and NO2, which are typical oxidants in the surface/interface atmosphere, and the evolutionary and budgetary implications of atmospheric oxidants reacting under multispecies, multiphase and multi-interface conditions were obtained. Finally, based on the GRAPES-CUACE adjoint model improved by Chinese scholars, simulations of key substances affecting atmospheric oxidation and secondary organic and inorganic aerosol formation have been optimized. Normalized numerical simulations of AOIe and AOIp were performed, and regional coordination of AOC was adjusted. An optimized plan for controlling O3 and PM2.5 was analyzed by scenario simulation. 相似文献
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秦皇岛港通过对煤场区域煤尘的监测,评估港口各煤炭公司的煤尘污染现状,考核各公司煤尘控制效果,较好地解决了在无组织排放源的定量管理问题,使环境监测与环境管理有机结合起来,提高管理的科学性,使港区大气环境质量不断得到改善。 相似文献
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建设项目实施过程中的可行性研究与环境影响评价 总被引:3,自引:0,他引:3
作者根据多年的工作实践,分析了目前建设项目可行性研究与环境影响评价工作中存在的一些问题。提出了编写环境影响评价报告时如何有效地利用建设项目的可行性研究报告文本,以及在没有可行性研究报告的情况下怎样使环境影响评价报告能够准确地反映建设项目的环境问题,进而保证环境影响报告书的质量。总之,恰当处理这两者之间的关系,保证建设项目在建设期与运营期降低与防止建设项目对周边环境影响是本文的主要目的之一。 相似文献
70.
贵阳市乌当区耕地土壤重金属污染现状及其评价 总被引:31,自引:0,他引:31
在对乌当区10乡镇耕地土壤进行全面调查的基础上,对土壤重金属污染现状进行了监测与初步评价,结果表明:该区域10乡镇耕地土壤5种重金属元素(Cd、Pb、Cr、Hg、As)的含量变幅较大;全区耕地土壤重金属污染综合评价处于警戒水平,多因子综合污染指数为0.78.其中,金华、朱昌两镇的耕地土壤已受到了重金属轻度污染,多因子综合污染指数分别为1.13、1.22,羊昌、新堡、下坝、东风、水田等5乡镇的耕地土壤处于警戒状态,新场、百宜、偏坡等3乡镇的土壤处于安全状态;Cd、Cr是该区耕地土壤的主要污染元素。 相似文献