Effects of tributyltin at environmental levels on monooxygenase system of digestive gland in hard clam Meretrix meretrix     

HUANG Zhouying  CHEN Yixin  WANG Chonggang  ZHAO Yang  ZUO Zhenghong 《海洋学报(英文版)》2007,26(2):144-149

The effects on ethoxyresorufin O-deethylase （EROD）, NADPH-cytochrome c reductase and NADH cytochrorne b5 reductase activities of digestive gland in Meretrix meretrix exposed to tributyltin （TBT） at environmental levels （0.1,1.0,10.0 ng/dm as stannum concentration）,in experimental condition, were evaluated. The EROD, NADH cytochrorne b5 reductase activities were significantly inhibited after exposure to 10.0 ng/dm^3 TBT for 8 and 20 d, the NADPH cytochrorne c reductase activities were significantly inhibited after exposure to 0.1,1.0 and 10.0 ng/dm TBT for 8 d and to 1.0 and 10.0 ng/dm for 20 d, as compared with the matched control, while NADH cytochrorne b5 reductases and NADPH cytochrome c reductase activities were induced after exposure to 10.0 ng/dm^3 TBT for 2 d. The EROD activity in the 10 ng/dm^3 group,and the NADH cytochrome b5 reductases activities in 1.0 and 10.0 ng/dm groups, were significantly induced when transferred to clean recovery tanks for 7 d. The three enzymic activities in the clams exposed to TBT were recovered to the level corresponding to that of the control group after transfer to clean recovery tanks for 20 d. NADPH cytochrome c reductase activity in Meretrix meretrix seems to be more sensitive to exposure of TBT than that of the EROD and NADH cytochrome b5 reductases. The results suggest that induction and inhibition by TBT to the monooxygenase system enzymic activity in Meretrix meretrix would simultaneously exist. The enzymic activities were inhibited by exposure for a long time. The results suggest that inhibition of the monooxygenase system should be an indication of the exposure to environmentally relevant concentrations of TBT for a long time.  相似文献   

基于荧光原理的叶绿素a传感器校准方法研究     

《海洋技术学报》2024,(1)

利用传感器对水体叶绿素a 浓度进行原位测量是获取实时、连续、长时间序列数据的重要手段。本文在对RBR 传感器和ECO（Environmental Characterization Optics）传感器进行原理分析和线性度、稳定性、重复性等基本性能测试的基础上，利用单一藻种培养液和2020年南海北部海域现场数据校准传感器，并对新的传感器校准系数进行验证。结果表明：两台传感器使用新系数比原出厂系数的叶绿素a 浓度测量准确度有明显提高。RBR 传感器现场数据校准系数的计算结果与叶绿素a 标准值误差最小，平均绝对误差从1.93 μg/L 减小到0.35 μg/L，平均相对误差从55.1%减小到10.9%；ECO 传感器藻液系数明显优于出厂系数和现场数据校准系数的计算结果，平均绝对误差从1.76 μg/L 减小到0.59 μg/L，平均相对误差从50.3%减小到15.1%。传感器测量准确度的提高，可为海洋环境监测、海洋生态灾害预警等工作获取真实可靠数据提供支撑。  相似文献   

浮游植物叶绿素a含量简易测定方法的比较   总被引：17，自引：0，他引：17       下载免费PDF全文

杨彩根  宋学宏  孙丙耀 《海洋科学》2007,31(1):6-9

用乙醇、DMF(N,N-二甲基甲酰胺)、丙酮3种不同有机溶剂分别萃取苏州环城河水样中的浮游植物细胞叶绿素a,在分光光度计上测定其叶绿素a含量,试验数据经方差分析、Q检验,结果显示,乙醇法、DMF法的叶绿素a萃取率极显著高于丙酮(F=54.20＞F0.01(2,18)(6.01)).另用这3种萃取方法分别测定无常蓝纤维藻(Dactylococcopsis irregularis )纯培养液叶绿素a含量,通过直线回归,同样证明乙醇法、DMF法重复率较高,稳定性好,萃取率高.从安全、简便、重复性高等方面综合考虑,认为用乙醇萃取法是目前水域环境中浮游植物叶绿素a简易测定的最佳方法.  相似文献   

南海北部水体叶绿素a浓度反演的生物光学模型   总被引：2，自引：0，他引：2  

许大志  曹文熙  王桂芬 《热带海洋学报》2007,26(2):15-21

利用2003年至2005年秋季在南海多个航次的现场观测数据,研究了南海北部海区遥感反射率的变化,并分析了用于全球海洋叶绿素a浓度反演的OC2和OC4模型在本海区的适用性。结果表明,在南海北部海域,OC2和OC4模型高估了叶绿素a浓度,高估范围一般约在80%—200%之间,其中最高可达640%,即OC2和OC4模型并不适用于南海海域。在此基础上,根据现场实测的表观光学数据,利用遥感反射率比值(Rrs(433)/Rrs(555))与叶绿素a浓度的关系建立了两套能够精确反演南海北部海域叶绿素a浓度的本地化经验算法———算法1和算法2,并利用其对南海北部海域的叶绿素a浓度进行反演。结果表明,由本地化模型反演得到的叶绿素a浓度与实测的叶绿素a浓度具有较好的相关关系,其平均相对偏差分别为51%和53%,相关系数为0.75。  相似文献   

The algorithms of chlorophyll-a concentration for CMODIS     

MAO Zhihu  ZHU Qiankun  GONG Fang  PAN Delu 《海洋学报(英文版)》2007,26(5):25-33

The algorithms of extracting chlorophyll-a(Chl-a) concentration have been established for Chinese moderate resolution imaging spectrometer(CMODIS) mounted on Shenzhou-3 spaceship launched on 25 March 2002.The CMODIS is an ocean color sensor with 30 visible channels and 4 infrared channels,much different from other ocean color satellites and needs new algorithms to process data.Three models of Chl-a concentration were established based on Chl-a data retrieved from sea-viewing wide field-of-view sensor(SeaWiFS),with the average relative errors of 26.6%,24%.0% and 33.5%,respectively.This practical and economic approach can be used for developing the algorithms of Chinese ocean color and temperature sensor(COCTS) on the satellite Haiyang-1 to derive the Chl-a concentration concentration distribution.The applicability of the algorithms was analyzed using some in situ measurements.Suspended sediment is the main factor influencing the accuracy of the spectral ratio algorithms of Chl-a concentration.The algorithms are suitable to using in the regions where suspended sediment concentrations(SSC) are less than 5 g/m3 under the condition of relative error of Chl-a concentration retrieval within 35%.High concentration of suspended sediment leads to the overestimate remote sensing retrieval of concentration of Chl-a,while low-middle SSCs lead to the low Chl-a concentration values using the spectral ratio algorithms.Since the accuracy of Chl-a concentration by the spectral ratio algorithms is limited to waters of Case 2,it is necessary to develop semi-analytical models to improve the performance of satellite ocean color remote sensing in turbid coastal waters.  相似文献   

基于消息通知机制的国省数据共享系统的设计与实现     

顾文静  戴晴  张媛媛  王鹏 《气象科技》2021,49(6):860-868

为解决卫星广播传输缺陷及省级用户获取临省实时观测资料和实况分析产品等迫切的业务需求，设计并实现了基于消息通知机制的国省数据共享系统。系统基于RabbitMQ的消息机制进行业务和数据资源的整合及集成，采用多层体系架构，满足基于地面宽带的数据快速有序下载和卫星广播数据补调等国省数据共享需求，支持大容量多种数据的高速传输，支持HTTP、FTP、SFTP等多种数据传输协议。系统已经上线提供服务，实现智能网格、多源融合实况分析等25种气象资料的国省数据共享，月平均共享数据量达6.3 TB，且建立全流程监视，有效保障数据共享的时效性。  相似文献   

Paleoenvironmental records of water level and climatic changes from the middle to late Holocene at a Lake Erie coastal wetland, Ontario, Canada   总被引：2，自引：0，他引：2  

Sarah A. Finkelstein  Anthony M. Davis 《Quaternary Research》2006,65(1):33-43

Pollen and diatom assemblages, and peat stratigraphies, from a coastal wetland on the northern shore of Lake Erie were used to analyze water level and climatic changes since the middle Holocene and their effects on wetland plant communities. Peat deposition began 4700 cal yr B.P. during the Nipissing II transgression, which was driven by isostatic rebound. At that time, a diatom-rich wild rice marsh existed at the site. Water level dropped at the end of the Nipissing rise at least 2 m within 200 yr, leading to the development of shallower-water plant communities and an environment too dry for most diatoms to persist. The sharp decline in water level was probably driven primarily by outlet incision, but climate likely played some role. The paleoecological records provide evidence for post-Nipissing century-scale transgressions occurring around 2300, 1160, 700 and 450 cal yr B.P. The chronology for these transgressions correlates with other studies from the region and implies climatic forcing. Peat inception in shallow sloughs across part of the study area around 700 cal yr B.P. coincides with the Little Ice Age. These records, considered alongside others from the region, suggest that the Little Ice Age may have resulted in a wetter climate across the eastern Great Lakes region.  相似文献   

Identification of facies models in alluvial soil formation: The case of a Swiss alpine floodplain     

G. Bullinger-Weber  J.-M. Gobat 《Geomorphology》2006,74(1-4):181-195

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测井资料在碳酸盐岩储层评价中的应用   总被引：4，自引：0，他引：4  

魏历灵  农社卿  胡国山 《新疆地质》2005,23(1):73-78

以塔河油田碳酸盐岩储集层基本特征为依据，利用常规和能谱测井资料信息比值法和重叠法等技术．致力于储集层缝、孔、洞测井响应特征敏感性评价研究，从中提取8项储层敏感性参数，并对其进行综合评判，确定出划分储层类别的标准，经过50口井的测试资料验证，采用多参数综合评判来划分储层类别是可行的，对储层的评价效果较好，使常规测井资料得到了更深入、广泛的应用。  相似文献   

县市级政府决策信息系统的开发应用:专业GIS 软件SK set V4 .0功能介绍———以贵州沿河土家族自治县资源遥感信息系统为例   总被引：1，自引：0，他引：1  

周立新  莫源富  张家仁  杨炜 《中国岩溶》2002,21(2):145-151

SK setV4.0是中国地质科学院岩溶地质研究所GIS中心2001年4月开发成功的、具有自主板权的专业GIS平台软件。它集成了现今较为先进的组件、控件重用，面向对象编程等技术，并以美国Inprise公司的BorladnC^ Builder编译软件为开发平台，提供了全中文菜单环境，不仅具有基本信息和多图层查询、相关分析动态监测、多因子分析、图斑编辑、自动演示、系统维护等功能，而且还具有快速响应的工具条、友好的对话框和较强的纠错机制，很适合缺乏专业GIS人才的县市级政府管理部门使用。文中还以贵州省沿河县资源遥感信息系统为例，对SK setV4.0的功能和使用方法进行了具体的介绍。  相似文献