藓羽藻(Bryopsis hypnoides)核酮糖-1，5-二磷酸羧化酶／加氧酶的分离与活性测定     

田超  张炎  王广策  曾呈奎 《海洋与湖沼》2004,35(4):371-375

采用硫酸铵分部沉淀与凝胶过滤的方法，进行藓羽藻Rubisco的分离研究。结果表明，分离的藓羽藻Rubisco经SDS-聚丙烯酰胺凝胶电泳检测呈两条清晰条带，分别为Rubisco大亚基与小亚基；与菠菜相比，藓羽藻Rubisco大亚基分子量与菠菜基本相同，而小亚基较之稍大一些。藓羽藻Rubisco活力测定结果表明，Rubisco分离过程中用硫酸铵分部沉淀后活力降低许多，分离后活力有所上升，但仍比粗提液活力弱；在Rubisco活力测定过程中，藓羽藻Rubisco的活化温度与其它物种Rubisco活化的温度不同，在低温下活化效果较好。这些结果说明Rubisco的酶活力受硫酸铵的影响而且藓羽藻Rubisco相对陆地高等植物结构不稳定。  相似文献   

焉耆盆地博湖坳陷三工河组层序格架及沉积体系的时空配置关系   总被引：2，自引：1，他引：1  

蔡佳  王华  赵忠新  陈少平 《地质科技情报》2008,27(4)

利用层序地层学、沉积学原理和方法,对博湖坳陷下侏罗统三工河组进行了层序划分和沉积体系时空配置关系的研究.建立了三工河组的层序地层榕架,将其划分为J1s3、J1s2和JJ1s13个三级层序,其层序和体系域的变化主要受控于凹陷内沉降中心的分布,沉积主要受控于盆地边缘的南缘陡坡带、北缘缓坡带.每个三级层序低水位体系域发育局限,湖扩与高水位体系域发育.沉积体系构成以扇三角洲、湖泊和辫状河三角洲为主.在建立沉积体系时空配置关系的基础上探讨了沉积体系的演化.  相似文献   

基于RS与GIS技术的变更图斑自动识别方法研究     

蒋洪波  陈超 《测绘科学》2008,33(3):71-73

基于RS与GIS技术的土地利用变更图斑自动识别方法,即"以遥感正射影像图为基础,以地理信息和地物反射光谱为判别依据"的变更信息识别方法,能够尽量避免传统利用遥感影像分类技术进行地物变更识别存在的不足。本文通过对距离算法的改良,有效利用遥感数据的实时性和丰富性,在地理信息系统的支持下,提高了对地物变更地块的识别精度。  相似文献   

电子地图符号构图规律的研究     

谢超  陈毓芬  柯希林  柳佳佳 《北京测绘》2008,(1):35-37

根据电子地图屏幕显示与阅读的特点,应用地图视觉感受理论及地图符号学理论对电子地图符号的构图规律进行研究,是有效地改进电子地图设计所必需的。本文从电子地图符号构图规律研究的必要性入手,根据对电子地图视觉变量的理解,应用地图视觉感受理论和地图符号学理论,对电子地形图符号体系进行研究,同时根据符号库建库的需要,将所有符号分解为最小图元,提出了点状、线状及面状符号的构图规律。  相似文献   

基于矿物学方法评价浙江省土壤中Pb污染状况     

郑喜珅  鲁安怀  汪庆华  郑佳  朱朝晖  于芳 《地质科技情报》2008,27(3):77-82

利用土壤重金属元素环境质量矿物学评价方法,对淅江省全境土壤中不同土壤类型(或亚类)表层、不同母质表层和剖面中的Pb进行环境质量评价的结果表明,土壤中Pb的实测量和土壤对Pb的固持量决定了土壤中Pb的环境质量,浙江省土壤中Pb的污染度有正负值,说明土壤中的Pb对有些地区产生了污染,而对有些地区则没有产生污染.研究结果揭示,土壤矿物对Pb具有一定的固定与容纳能力,超过其固定与容纳能力,土壤中的Pb会对环境造成污染.这一旨在揭示土壤中重金属元素与各种矿物之间环境平衡关系的方法,可为评价土壤环境质量提供科学依据和技术支撑.  相似文献   

高放废物处置库天然类比及其有关的地球化学问题     

郭永海  王驹  王志明  刘淑芬  宗自华  周佳 《物探与化探》2008,32(5):574-577

介绍了高放废物处置库天然类比研究的主要内容,重点阐述了类比研究中涉及的地球化学问题,包括核素溶解度和化学形态研究、核素迁移速率研究、核素迁移影响因素研究,并总结相关问题研究取得的成果和认识.  相似文献   

Geochemical characteristics and source analysis of inflow of mine water in Wang’ershan Gold Mine, Shandong   总被引：1，自引：0，他引：1  

QIAN Jianping  LI Shuangli  and CAO Chao Guilin University of Technology  Guilin  China 《中国地球化学学报》2008,(1)

Through a systematic observation of water level and temperature, and a comprehensive analysis of the data on major/trace elements, nitrite, hydrogen-oxygen isotopes, the conclusion has been drawn that there are two relatively independent groundwater systems (cool water and hot water), and the geochemical indicators of hot/cool waters are described. The cool water system is relatively enriched in Ca2 , Mg2 and HCO3-. Its TDS is relatively low, about 1400–1800 mg/L. The hot water system is relatively enriched in K , Na , Cl- and SO42-. Its TDS is relatively high, about 2200–2300 mg/L. The cool water system is enriched in Ba, Ga, Cd, and the hot water system is enriched in B, Ti, Cr, Ni, Cu, Mo, Rb, and Cs, relatively. Especially, the contents of Rb and Cs in the hot water system are more than five times as high as those in the cool water system. The NO3- contents of cool water discharged from the gold mine are relatively high, and those of hot water are extremely low. The δD and δ18O values follow an increasing order of surface water>mine cool water>mine hot water. The cool water comes mainly from the lateral supply of phreatic water, while the hot water comes mainly from the vertical supply of deeply circulating structure-fracture water. The ratio of cool water over hot water was estimated to be about 1:1 by a water quality model..  相似文献   

Environmental Investigation and Evaluation of Land Subsidence in the Datong Coalfield Based on InSAR Technology   总被引：1，自引：0，他引：1  

JIA Xiuming  MA Chao  ZHAO Anyuan 《《地质学报》英文版》2008,82(5):1035-1044

Heavy mining of Jurassic and Carboniferous horizontal coal seams in the Datong coalfield has seriously affected the local geological environment, which is mainly manifested by such geohazards as soil avalanches, landslides, mudflows, surface subsidence, surface cracks, surface solid waste accumulation and surface deformation. More seriously, coal mining causes groundwater to leak. Overpumping of groundwater has resulted in substantial land subsidence of the urban area in Datong City. Based on the previous geo-environmental investigation in the work area, the authors used radar remote sensing techniques such as InSAR （synthetic aperture radar interferometry） and D-InSAR （differential synthetic aperture radar interferometry）, supplemented by the optical remote sensing method, for geo-environmental investigation to ascertain the geo-environmental background of the Datong Jurassic and Carboniferous-Permian coalfield and evaluate the effects of the geohazards, thus providing a basis for the geo-environmental protection, geohazard control and prevention, land improvement and optimization of the human environment. In this study 8 cog-nominal ERS-1/2 SAR data frames during 1992 to 2003 were used, but the following processing was made： （1） the multitemporal SAR magnitude images were used to interpret the geological structure, vegetation, microgeomorphology and drainage system; （2） the multi-temporal InSAR coherent images were used to make a classification of surface features and evaluate the coherence change due to coal mining; and （3） the multi-temporal cog-nominal SAR images were used to complete D-InSAR processing to remove the information of differential deformation areas （sites）. In the end, a ten-year time series of differential interferograms were obtained using the multi-temporal cog-nominal SAR images. In the tests, 84 deformed areas （sites） were obtained, belonging to those in 1993-1996, 1996-1997, 1997-1998, 1998-2001, 1998-2002 and 2001-2003 respectively. Of the 84 areas, 44 are m  相似文献   

Petroleum Migration Direction of the Silurian Paleo-pools in the Tarim Basin, Northwest China   总被引：1，自引：0，他引：1  

LIU Luofu  ZHAO Ye  HUO Hong  CHEN Lixin  CHEN Yuanzhuang  ZHAO Suping  LI Chao  LI Shuangwen  GUO Yongqiang  LI Yan 《《地质学报》英文版》2008,82(1):174-183

The results obtained in this paper indicate that carbazole-type compounds have high thermal stability and also show stability in oxidation and bio-degradation. This kind of compounds still has a high concentration and complete distribution in the analyzed dry asphalt samples, showing that they are particularly useful in studying petroleum migration of paleo-pool. During the basin＇s first-stage of oil-gas pool formation in the Silurian in Tazhong and Tabei areas of Tarim Basin （at the end of Silurian period） and the second-stage in the Awati area （in Permian）, the petroleum experienced a long-distance migration. During the formation of the Silurian paleo-pools in Tazhong Uplift at the end of Silurian, the petroleum mainly came from the lower and middle Cambrian source rocks in the Manjiaer sag. The petroleum migrated towards the southwest-south entering the Silurian reservoir beds in Tazhong first. Then, it further migrated within Silurian from northwest to southeast along the highs of the Structural Belts to the region of the Silurian pinchout boundary in Tazhong. In Tabei Uplift, during the first-stage of pool formation, the petroleum was also from the lower and middle Cambrian source rocks in the Manjiaer sag. It migrated northwest entering the Silurian reservoir beds in the Tabei Uplift firstly, and then the migration continued in the same direction within the Silurian reservoirs and finally the petroleum was trapped in higher positions. During the second-stage pool formation in the Silurian beds in the areas around Awati sag, the petroleum mainly came from the lower-middle Cambrian source rocks in the Awati sag. The petroleum migrated from the generation center to Silurian reservoirs in all directions around the sag through major paths, and the petroleum was finally trapped in higher locations.  相似文献   

Late Cenozoic Stratigraphy and Paleomagnetic Chronology of the Zanda Basin, Tibet, and Records of the Uplift of the Qinghai-Tibet Plateau   总被引：1，自引：0，他引：1  

MENG Xiangang  ZHU Dagang  SHAO Zhaogang  YANG Chaobin  HAN Jianen  YU Ji  MENG Qingwei  LU Rongping 《《地质学报》英文版》2008,82(1):63-72

The characteristics of Late Cenozoic tectonic uplift of the southern margin of the Qinghai- Tibet Plateau may be inferred from fluvio-lacustrine strata in the Zanda basin, Ngari, Tibet. Magnetostratigraphic study shows that the very thick fluvio-lacustrine strata in the basin are 5.89- 0.78 Ma old and that their deposition persisted for 5.11 Ma, i.e. starting at the end of the Miocene and ending at the end of the early Pleistocene, with the Quaternary glacial stage starting in the area no later than 1.58 Ma. Analysis of the sedimentary environment indicates that the Zanda basin on the southern Qinghai-Tibet Plateau began uplift at -5.89 Ma, later than the northern Qinghai-Tibet Plateau. Presence of gravel beds in the Guge and Qangze Formations reflects that strong uplift took place at -5.15 and -2.71 Ma, with the uplift peaking at -2.71 Ma.  相似文献