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801.
802.
离子色谱法同时测定柠檬酸发酵液中无机阴离子和有机酸 总被引:4,自引:0,他引:4
本文建立了以NaOH为淋洗液,甲醇为有机改进剂,阴离子交换分离,化学抑制型电导检测,快速测定柠檬酸发酵液中有机酸和SO^2-4,PL^3-4的离子色谱新方法,方法简单,灵敏,用于样品分析,结果令人满意。 相似文献
803.
Phylogenetic diversity of Archaea in prawn farm sediment 总被引:2,自引:0,他引:2
Peng?Shao Yueqin?ChenEmail author Hui?Zhou Lianghu?Qu Ying?Ma Heyang?Li Nianzhi?Jiao 《Marine Biology》2004,146(1):133-142
The structure and diversity of the Archaea collected from prawn farm sediment were investigated for the first time. A partial 16S ribosomal DNA library was constructed with Archaea-specific primers. Subsequently, 80 randomly selected archaeal clones from the library were analyzed by restriction fragment length polymorphism (RFLP), and resulted in 50 different RFLP patterns. Sequence analysis of representatives from each unique RFLP type revealed high diversity in the archaeal populations, and the majority of archaeal clones were either members of novel lineages or most closely related to uncultured clones. In the phylogenetic analysis, the archaeal clones could be grouped into discrete phylogenetic lineages within the two kingdoms Crenarchaeota and Euryarchaeota. Euryarchaeota dominated in our archaeal library, with up to 72.2% of the total clones, and Crenarchaeota represented 27.8%. Of all the Euryarchaeota clones, three clones (5.6%) were affiliated with Methanosarcinales, four clones (7.4%) were related to Methanomicrobiales, three clones (5.6%) were related to Halobacterium (with 93% similarity), and the remaining clones (81.5%) were related to those uncultured Euryarchaeota in the aquatic sediment ecosystem. None of the crenarchaeal clones were associated with any known cultured lineages. The selective dispersal of the archaeal population indicates that their ecological niches are associated with environmental characteristics. Novel phylotypes of Archaea would expand our understanding of the genetic diversity of Archaea in aquatic sediment systems and would be significant in the phylogenetic study of Archaea.Communicated by O. Kinne, Oldendorf/Luhe 相似文献
804.
805.
806.
草制浆造纸中段废水处理及回用技术分析研究 总被引:2,自引:0,他引:2
中段废水是制浆造纸工业的主要污染源之一,从工程设计的角度出发,对草制浆造纸中段废水处理及回用提出一套可行适用的工艺方案;对主要工艺环节参数、设备备有说明,以供同行借鉴。 相似文献
807.
屈铁军 《防灾减灾工程学报》1996,(4)
利用SMART-1台阵3次地震的水平分量加速度记录统计了局部场地上地震动加速度最大幅值、到时的变化特性。统计结果表明:在局部场地上,地震动加速度的最大幅值随土层厚度和测点坐标的变化是显著的,而到时变化仅依赖于测点坐标 相似文献
808.
环境质量模糊综合评价及其应用 总被引:7,自引:1,他引:7
环境质量评价是环境科学的重要研究课题之一,作者评述了常用指标法的不足,提出用模糊数学中综合模糊评价法评价环境质量,建立了评价模式和计算程序,并用于科学城的环境质量评价,评价计算给出的多层次数据所提供的信息,与监测结果所体现的环境质量状况符合,所建模糊评价程序是适用的。 相似文献
809.
我国沙漠化灾害的发展及其危害 总被引:15,自引:1,他引:15
沙漠化灾害是在特定自然环境背景下产生的,严重危及人类生产和生存。文章着重阐述沙漠化发展对农、牧业、工矿交通及环境等方面造成的经济损失。据初步统计,全国每年因沙漠化遭受的直接经济损失达36~45亿元,间接经济损失高达292亿元以上。同时,指出沙漠化的实质是从根本上毁损土壤肥力,丧失人类赖以生存的土地。因此,从沙漠化发生时间的频繁性、经常性,空间分布的广泛性,致害的多样性及造成的经济损失严重性看,沙漠化灾害是我国严重自然灾害之一。 相似文献
810.
Plant-trait-based modeling assessment of ecosystem-service sensitivity to land-use change 总被引:1,自引:0,他引:1
Fabien Quétier Sandra Lavorel Wilfried Thuiller Ian Davies 《Ecological applications》2007,17(8):2377-2386
Evidence is accumulating that the continued provision of essential ecosystem services is vulnerable to land-use change. Yet, we lack a strong scientific basis for this vulnerability as the processes that drive ecosystem-service delivery often remain unclear. In this paper, we use plant traits to assess ecosystem-service sensitivity to land-use change in subalpine grasslands. We use a trait-based plant classification (plant functional types, PFTs) in a landscape modeling platform to model community dynamics under contrasting but internally consistent land-use change scenarios. We then use predictive models of relevant ecosystem attributes, based on quantitative plant traits, to make projections of ecosystem-service delivery. We show that plant traits and PFTs are effective predictors of relevant ecosystem attributes for a range of ecosystem services including provisioning (fodder), cultural (land stewardship), regulating (landslide and avalanche risk), and supporting services (plant diversity). By analyzing the relative effects of the physical environment and land use on relevant ecosystem attributes, we also show that these ecosystem services are most sensitive to changes in grassland management, supporting current agri-environmental policies aimed at maintaining mowing of subalpine grasslands in Europe. 相似文献