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阐述了城市绿色廊道系统在城市绿地系统中的应用及生态价值,并在分析东营市西城区绿地系统现状的基础上,提出了建设西城区绿地廊道系统的方法,以加强城市孤立绿地斑块之间以及城市绿地与城郊外围自然环境的联系,优化城市绿地系统的结构,提高城市生态系统的稳定性.通过合理构建绿色廊道网络系统,西城区将新增绿地面积1400hm2,人均绿地面积将达到66m2,城市与郊区的绿地生态系统将贯通为一体,绿地生态系统的服务范围将扩展到整个城区,为提高西城区居民的生活质量,增强西城区生态敏感区的生态稳定性提供有力支持.  相似文献
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外生菌根与植物抗重金属胁迫机理   总被引:8,自引:1,他引:7  
黄艺  黄志基 《生态学杂志》2005,24(4):422-427
外生菌根是外生菌根真菌和植物营养根形成的共生体,能够增加植物对污染胁迫的抵抗能力。本文综述了20多年来国内外研究外生菌根增加植物抗重金属毒害的成果,指出了外生菌根在植物抗重金属毒害中的积极作用,并概括其抗性的主要机理为:外延菌丝的吸收作用;菌根分泌物的调节与螯合作用;菌根菌套或哈蒂氏网吸收过滤有毒金属;菌根菌套的疏水性作用。在研究外生菌根抗重金属毒害机理的基础上,提出了该领域今后的研究前景。  相似文献
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Guo F  Li Y  Liu Y  Huang J  Zhang Z  Wang J  Li Y  Hu J  Li G 《Molecular biology reports》2012,39(6):6923-6931
It is important to understand the mechanisms of tumor development for curing cervical cancer. However, the molecular basis determining the different characteristics of tumor remains unclear. Space environment as a special study model can expand the study field of tumor development. To approach this, after human cervical carcinoma CaSki cells were flown on “Shen Zhou IV” space shuttle mission, the cell morphology and proliferation was investigated after flying to ground. We found that the growth of 48A9 CaSki cell (flight group) became slow compared with ground groups. Observation of cells by light microscopy revealed differences in cell morphology between ground controls and flight groups, and the flight group exhibited morphologic differences, characterized by rounder, smoother, decreased, smaller and low-adhension cells. Transmission electron microscope images showed the structure of the ultrastructural characteristics of 48A9 CaSki cells were clearly distinct from those of the ground CaSki cells in aspects of mitochondrion, cytoplasm, nucleus and ribosomes. MTT and soft agar assay showed that 48A9 CaSki cells grew slowly compared to ground control. Furthermore, suppression subtractive hybridization combining with reverse Northern blot was used to identify differently expression genes between flight and ground groups. These differentially expressed genes included cytoskeleton, cell differentiation, cell apoptosis, signal transduction, DNA repair, protein synthesis, substance metabolism, and antigen presentation. The identification of differently expressed genes which is likely to increase our understanding of the molecular processes underlying tumor development will provide new insight into tumor development mechanisms, and may facilitate the development of new anticancer strategies.  相似文献
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