Differential gene expression in the brain of Sebastiscus marmoratus in response to exposure to polychlorinated biphenyls (PCBs)

Effects of exposure to polychlorinated biphenyls (PCBs) on Sebastiscus marmoratus were investigated using a suppression subtractive hybridization method. A total of 108 gene sequences were identified as having the potential for being differentially expressed, and 45 could be identified with homologous database sequences. Functions with which they were associated included long-term potentiation and neurotransmitter release, neuroendocrine, mitosis and cell proliferation, energy-related metabolism, general metabolism, signal protein, hemopoiesis system, immune system, and structure. The expression of 17 of these genes was analyzed in the brain using real time fluorescent quantitative PCR. The present study provided a basis for studying the response of fish to PCB exposure and allowed the characterization of new potential neurotoxicol biomarkers of PCB contamination in seawater.     

从跨国广告业看全球化和全球城市——以中国广告业为例

本文从广告业的视角出发 ,分析了伴随全球生产者服务业空间布局的扩张而来的区域市场和空间结构的重塑。研究的主要发现为 :(1)在跨国公司的支配下 ,中国广告业在生产组织上逐渐向专业代理演化 ,在行业规范上也逐渐向 4A的主流靠拢 ;(2 )中国广告业在上海、北京、广州三大城市的集中 ,体现了在全球化过程中形成的“区域性服务业市场” ;(3)由于市场规模大 ,中国广告业有可能向“前端” (产品定位和沟通策略 )发展 ;(4 )由于中国幅员广大 ,进入区域市场需要不同的媒体计划 ,也使得广告的全球标准化产品产出更多的地方版本。在理论争论方面 ,本文认为全球城市是都市区域全球化制度和空间的中介。     

四川雅安市雨城区降雨诱发滑坡研究

降雨是滑坡灾害的重要诱发因素之一。通过详细的地质灾害调查及地质灾害与降雨相关关系的研究,得出降雨对雅安雨城区地质灾害诱发作用的规律并进一步定量评价了诱发因素级别。研究发现,降雨量对滑坡的诱发因素可划分为4级,1d降雨量分级临界值分别为20mm、50mm和100mm,3d降雨量分级临界值分别为100mm、150mm和240mm。这一研究成果为雅安雨城区地质灾害预警预报提供了基础。     

基于ArcGIS的地铁施工中地层变形模拟研究

采用反距离权重法,应用ArcGIS对地铁施工引起的土体变形和地面沉降进行3维可视化模拟及预测.并通过与传统估算方法进行比较分析,为地铁施工风险评估提供直观及可靠的依据.     

Interannual salinity variability of the Northern Yellow Sea Cold Water Mass

This paper discusses the interannual variability of the Northern Yellow Sea Cold Water Mass(NYSCWM) and the factors that influence it,based on survey data from the 1976–2006 national standard section and the Korea Oceanographic Data Center,monthly E-P flux data from the European Centre for Medium-Range Weather Forecasts,and meridional wind speed data from the International Comprehensive Ocean-Atmosphere Data Set. The results show that:1) the mean salinity of the NYSCWM center has a slightly decreasing trend,which is not consistent with the high salinity center; 2) both the southern salinity front and the halocline of the NYSCWM display a weakening trend,which indicates that the difference between the NYSCWM and coastal water decreases; 3) the Yellow Sea Warm Current intrusion,the E-P flux of the northern Yellow Sea,and the strength of the winter monsoon will affect the NYSCWM salinity during the following summer.     

面向网格环境的Java跨平台GIS系统原型实现的关键技术

针对传统地理信息系统在空间数据处理中无法有效进行数据访问与集成的问题,提出了面向网格计算环境下空间数据访问与集成的地理信息系统体系架构,并给出了面向网格环境的Java跨平台GIS系统原型的设计方案,以及地理信息网格服务化提升的关键技术。进一步整合Java拓扑模型、Eclipse富客户端平台与面向海量数据访问的数据网格组件,以标准规范的开发流程,给出构建面向网格环境具备可拓展结构的跨平台地理信息系统原型的实现过程。     

数据共享与学科交叉研究——浅析社科领域的GIS系统应用

随着GIS产业的建立和数字化信息产品在全世界的普及,GIS已然发展成为一个以领域应用为主的信息产业.纵观现今GIS技术的科研应用领域,大多数领域的应用都集中在其有很强空间属性的自然科学范畴中,而在同样需要时空属性支持的哲学人文社会科学领域却为数不多.因此,为了增强对哲学人文社会科学领域研究中与时空属性相关的支持,研究G...     

化学计量学与X射线荧光光谱分析

简要回顾了Ｘ＿射线荧光分析中数学校正模型的发展进程;阐述了基体校正方程与化学计量学之间的关系;介绍了偏最小二乘回归、神经网络、专家系统和模式识别等近期研究成果;以及轻元素测定、微束和薄层分析等数据处理技术。并对化学计量学方法在Ｘ＿射线荧光分析中的应用与发展前景作了评述     

The contribution of lateritization processes to the formation of the kaolin deposits from eastern Amazon

The eastern region of the Amazon is home to the most important kaolin bauxite producing district in Brazil, referred to as the Paragominas-Capim kaolin bauxite district, which has a reserve of at least 1.0 billion tons of high-quality kaolin used in the paper coating industry. The kaolin deposits are closely related to sedimentary rocks of the Parnaíba basin and their lateritic cover. Two large deposits are already being mined: IRCC (Ipixuna) and PPSA (Paragominas). The geology of the IRCC mine is comprised of the kaolin-bearing lower unit (truncated mature laterite succession derived from the Ipixuna/Itapecuru formation) and the upper unit (immature lateritized Barreiras formation). The lower kaolin unit is characterized by a sandy facies at the bottom and a soft (ore) with flint facies at the top. It is formed by kaolinite, quartz, some iron oxi-hydroxides, mica and several accessories and heavy minerals. The <2 μm kaolinite crystallites only correspond to 41.3–58.3% of the soft kaolin, and large booklets of 15–300 μm are common. The degree of structure order of kaolinite decreases towards the flint kaolin. The chemical composition of the soft kaolin is similar to the theoretical chemical composition of kaolinite, with low iron content, and can be well correlated to most kaolin deposits in the region. The distribution pattern of chemical elements from sandy to flint kaolin (lower unit) suggests a lateritic evolution and erosive truncation. This is quite distinct from the upper unit, which has a mineralogical and chemical pathway relating it to a complete immature lateritic profile. The geological evolution of the IRCC kaolin is similar to that of other deposits in the eastern Amazon region, being comprised of: parent rocks formed in an estuarine marine and fluvio-laccustrine environment during the early Cretaceous; establishment of mature lateritization with the formation of kaolin in the Eocene; marine transgression and regression – (Pirabas and Barreiras formation) with kaolin profile erosion and forward movement of deferruginization and flintization during the Miocene after partial mangrove covering; and immature lateritization – partial kaolin ferruginization during the Pleistocene.     

Effect of oil pollution on gluthione and relative enzyme in oyster(Saccostrea cuculiata)

The oysters ( Saccostrea cuculiata ) were collected from four stations around Xiamen Island (Lundu Port, Xinglin Bay, Tong" an Bay, Huangcuo). The relation between the level of petroleum hydrocarbon in whole tissue and the contents of glutathione (GSH), the activity of selenium-dependent glutathione peroxidase (Se-GPx) and glutathione S-transferase (GST) in digestive gland and gill were investigated. The results showed: (1) The contents of petroleum hydrocarbon in oyster collected from four stations (Lundu Port, Xinglin Bay, Tong'an Bay, Huangcuo) were 380.68, 112.34, 27.31, 20.37μg/g wet weight, respectively; (2) the activity of Se-GPx and GST in digestive gland was lower than that in gill, and the content of GSH seemed reversibly; (3) among the four stations, both Se-GPx and GST activity of digestive gland and gill in Saccostrea cuculiata sampled from the four stations showed a good correlation with whole tissue petroleum hydrocarbon, could be as biomarkers of sea oil pollution.