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Cesium accumulation by bacterium Thermus sp. TibetanG7:hints for biomineralization of cesium-bearing geyserite in hot springs in Tibet,china

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Chinese Science Bulletin 2007年第19期52卷 2680-2686页

作者： WANG HaiLei1,2,3, ZHENG MianPing1,2,3 & HUANG XiaoXing4 1 Institute of Mineral resources, Chinese Academy of Geological Sciences (cags), beijing 100037, china 2 r&d center for saline lake and epithermal deposits, cags, beijing 100037, china 3 Open Laboratory of saline lake resourses and Environment, cags, beijing 100037, china 4 Laboratory of Microbial resources, Institute of Microbiology, Chinese Academy of Sciences, beijing 100081, china Institute of Mineral resources Chinese Academy of Geological Sciences (CAGS) Beijing China r&d center for saline lake and epithermal deposits CAGS Beijing China Open Laboratory of saline lake resourses and Environment CAGS Beijing China Laboratory of Microbial resources Institute of Microbiology Chinese Academy of Sciences Beijing China

The bacterium Thermus sp. TibetanG7, isolated from hot springs in Tibet, china, was examined for the ability to accumulate cesium from solutions. Environmental conditions were simulated and the effects of pH, K+, Na+ and K+-regimes were then studied to determine the possible role of the bacterium in the formation of cesium-bearing geyserite around these hot springs. In despite of the inhibition of K+ and Na+, the bacterium Thermus sp. TibetanG7 revealed noticeable accumulation of cesium from solutions, with maximum accumulations of 53.49 and 40.41 μmol Cesium/g cell dry weight in Na+ and K+ inhibition experiments, respectively. The accumulation of cesium by this microorganism is rapid, with 40%―50% accumulated within the first 5 min. K+-deficient cells showed a much higher capacity of cesium accu- mulation compared with K+-sufficient cells. It is evident that the bacteria within the genus thermus play a significant role in the cesium assembly. The formation of cesium-bearing geyserite is also considered.

关键词：铯元素沉积物硅华生物矿化

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Preliminary discussion of low-salinity hydrothermal fluid mineralization

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Chinese Science Bulletin 1999年第S2期44卷 141-143页

作者： ZHENG Mianping r & d center of saline lake and epithermal deposits, Chinese Academy of Geological Sciences, beijing 100037, china r and d center of saline lake and epithermal deposits Chinese Academy of Geological Sciences Beijing 100037 China

rEVIEWING the history of the geology of mineral deposits, we may find that in the first fifty years of thetwentieth century the magmatic-hydrothermal theory of ore deposition was the most prevalent, whichgave impetus to the development of the geology of mineral deposits. In the 1960s, the drilling of theSalton Sea geothermal field, California, the United States, and discovery and study of the red Sea seafloor hot brines and large amounts of metal sulfides removed therefrom led to the rise of the brine theory ofmineral deposition, thus elucidating the origin of massive metal sulfides and promoted the discoveryand exploration of metal deposits. After the 1970s and the 1980s, through a study of the hydrothermal ore fluids of modern hotsprings. geologists came to realize that there exist low-salinity hydrothermal ore fluids other than

关键词： low-salinity hydrothermal fluid mineralization.

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Evidence of the Pan-lake Stage in the Period of 40-28 ka B.P. on the Qinghai-Tibet Plateau

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 266-272页

作者： ZHENG Mianping, MENG Yifeng and Wei Lejunresearch & development center of saline lake and epithermal deposits,Chinese Academy of Geological Sciences, beijing 100037 Chinese Acad Geol Sci Res & Dev Ctr Saline Lake & Epithermal Deposits Beijing 100037 Peoples R China

The Qinghai-Tibet plateau is one of major saline lake regions in china, where saline lakes are widespread and constitute an important object of researches on the palaeoclimatic change in the region. On the basis of comprehensive investigations of the evolution of the lake's surface and sediments on the plateau, the authors have further demonstrated the existence of a pan-lake stage (river and lake flooding stage) on the Qinghai-Tibet plateau during the period of about 40+-28 ka B.P. and analyzed the palaeoclimatic characteristics of the pan-lake period and relationships between the ancient monsoons and the uplift of the plateau since the beginning of the Quaternary.

关键词： Qinghai-Tibet plateau Late Pleistocene pan-lake event palaeoclimate

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The effects of K^+ growth conditions on the accumulation of cesium by the bacterium Thermus sp. TibetanG6

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Science china(Life Sciences) 2006年第2期49卷 123-129页

作者： WANG Hailei1,2,3, KONG Fanjing1,2,3 & ZHENG Mianping1,2,3 1. r&d center for saline lake and epithermal deposits, Chinese Academy of Geological Sciences, beijing 100037, china 2. Key Open Laboratory of saline lake resources and Environment, Chinese Academy of Geological Sciences, beijing 100037, china 3. Institute of Mineral resources, Chinese Academy of Geological Sciences, beijing 100037, china r&d center for saline lake and epithermal deposits Chinese Academy of Geological Sciences Beijing China Key Open Laboratory of saline lake resources and Environment Chinese Academy of Geological Sciences Beijing China Institute of Mineral resources Chinese Academy of Geological Sciences Beijing China

The accumulation of cesium by the bacterium Thermus sp. TibetanG6 was examined under different K+ growth conditions. The effects of external pH and Na+ on the accumulation of ce-sium were also studied, and the mechanism involved was discussed. K+ regimes played an important role in the accumulation of cesium by the strain TibetanG6. The quantity of cesium accumulated (24 h) was much higher in K+-deficient regime than that in K+-sufficient regime. The pH and Na+ had different effects on the accumulation of cesium in the two K+ regimes. Ir spectra analyses indicated that the biosorption is a process of homeostasis with cesium initially accumulated on the cell wall.

关键词： Thermus sp. TibetanG6, cesium, bioaccumulation, K+-growth condition, pH, sodium, Ir spectroscopy.

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Carbon and Oxygen Stable Isotope Values and Microfossils at 41.4-4.5ka BP in Tai Co,Tibet,china,and Their Paleoclimatic Significance

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Acta Geologica Sinica(English Edition) 2011年第5期85卷 1036-1050+1052-1056+1051页

作者： ZHENG Mianping~(1,2,*),LIU Junying~(1,3),MA Zhibang~(1,4),WANG Hailei~(1,2) and MA Nina~(1,2) 1 MLr Key Laboratory of saline lake resources and Environment,Institute of Mineral resources,cags, beijing 100037,china 2 research and development center for saline lakes and epithermal deposits,Chinese Academy of Geological Sciences,beijing 100037,china 3 Institute of Geology,Chinese Academy of Geological Sciences,beijing 100037,china 4 Key Laboratory of Cenozoic Geology and Environment,Chinese Academy of Sciences,beijing 100029, china MLr Key Laboratory of saline lake resources and Environment Institute of Mineral Resources CAGS Beijing 100037 China research and development center for saline lakes and epithermal deposits Chinese Academy of Geological Sciences Beijing 100037 China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Key Laboratory of Cenozoic Geology and Environment Chinese Academy of Sciences Beijing 100029 China

Two sedimentary sections were measured at Tai Co(Co means lake in Tibetan) in western Tibet,*** two sections are almost all composed of clay carbonate beds except in their lower parts where there are carbonized plants at>10 cm depths and dark-colored carbonate clay and clay at 50-70 cm depths,yielding abundant gastropods,ostracods,and *** carbon and oxygen stable isotope values of carbonate,ostracods,and charophytes and ecological features of microfossil communities indicate the following climatic change in the area from 41.4 to 4.5 ka BP:at 41.4-26.2 ka BP,the climate was relatively wet;at 26.2-25.5 ka BP,it was slightly warm-dry;at 25.5-22.5 ka BP,it was warm-wet;at 22.5-21.0 ka BP,it was slightly cold-wet;at 20.5-17.5 ka BP,it became cold abruptly and slightly wet,implying the climate of the last glacial maximum;at 17.5-16.0 ka BP,it was slightly cold-dry;at 16.0-11.8 ka BP,it was slightly warm-wet;at 11.8-10.4 ka BP,it was relatively cold-dry, roughly equivalent to the climate of the Younger dryas,and at 10.4 ka BP,the temperatures began to rise again;at 10.4-9.4 ka BP,it was slightly warm-wet;at 9.4-8.5 ka BP,there occurred short warm-wet oscillations;at 8.5-7.9 ka BP,it was slightly dry-cold,representing a strong temperature-lowering and drying event in the postglacial stage;at 7.8-6.3 ka BP,it was slightly warm-wet;at 6.3-4.5 ka BP,the climate tended to be cold-dry.4.5 ka BP recorded the maximum aridity since the late part of the late Pleistocene.

关键词： sedimentary environment index paleoclimatic changes late Pleistocene-Holocene(41.4-4.5 ka BP) Tai Co Tibet

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Palaeoclihlatic Indicators of china's Quaternary saline lake Sediments and Hydrochemistry

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 259-265页

作者： ZHENG Mianping, ZHAO Yuanyi and LIU Junyingresearch & development center of saline lake and epithermal deposits,Chinese Academy of Geological Sciences, beijing 100037

In this paper the authors classify saline lake sediments into the cold, warm and eurythermal phases, reveal the consistency between the zoning of hydrochemical types of modern saline lake water and climatic zoning and give climatic parameters under the conditions of typical cold phase (mirabilite and natron), warm phase (thenar-dite) and slightly warm phase (bloedite) saline lake deposition.

关键词： saline lake sediments hydrochemistry palaeoclimatic indicator Quaternary

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西藏台错晚第四纪轮藻类的新类型

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微体古生物学报 2011年第2期28卷 145-168页

作者：刘俊英王海雷国土资源部盐湖资源与环境重点实验室北京100037 中国地质科学院盐湖与热水资源研究中心北京100037 中国地质科学院地质研究所北京100037 中国地质科学院矿产资源研究所北京100037

本文的研究材料来自西藏羌塘高原西部台错古湖一个3.69 m的天然剖面,其地层测年为32.6—4.5ka。从其156个样品中获取大量的轮藻类、介形类和腹足类及少量有孔虫等微体化石。据轮藻类藏卵器外形,顶部结构、螺旋细胞钙化式样等特征,该剖... 详细信息

本文的研究材料来自西藏羌塘高原西部台错古湖一个3.69 m的天然剖面,其地层测年为32.6—4.5ka。从其156个样品中获取大量的轮藻类、介形类和腹足类及少量有孔虫等微体化石。据轮藻类藏卵器外形,顶部结构、螺旋细胞钙化式样等特征,该剖面的轮藻类应归属于轮藻科Characeae之轮藻属Chara。经研究得知,台错古湖在大约28 ka的时期内,曾生长过22种轮藻,其中新类型7个,包括新种4个:Chara platea,***,***和***;新型2个:***,***;新变种1个:***。其余是曾产于国内外第四系的Chara其它分子。其中有5个新联合种:Chara alba(Madler et Staesche),***(Tang et di),***(Tang et di),***(Tang etdi)和***。该剖面轮藻类、介形类、腹足类等多门类微体化石的紧密共生,对轮藻植物群生态学研究具重要意义。

关键词：轮藻类新类型晚第四纪台错西藏

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Chinese HJ-1A/B satellites and data characteristics

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中国科学：地球科学英文版 2010年第S1期53卷 51-57页

作者： WANG Qiao1,WU ChuanQing1,LI Qing1 & LI JunSheng2 1 Satellite Environment center,Ministry of Environmental Protection,beijing 100029,china 2 center for Earth Observation and digital Earth,Chinese Academy of Sciences,beijing 100190,china Satellite Environment center Ministry of Environmental Protection Beijing China center for Earth Observation and digital Earth Chinese Academy of Sciences Beijing China

From the viewpoint of environmental remote-sensing applications,this article explains the overall technical characteristics of the Chinese HJ-1A and HJ-1B *** also investigates the spectral characteristics and potential applications of charge-coupled devices,and the infrared and hyperspectral data obtained by the *** of applications,such as the remote-sensing monitoring of algal bloom in Taihu lake,straw burning in southern china,and aerosol optical depth in the area around Bohai sea are *** examples illustrate the application characteristics of the HJ-1A and HJ-1B satellite data.

关键词： HJ-1A/B application remote sensing characteristics

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Primary Study on Quantitative reconstruction of Middle-Late Eocene Climate in Jianghan Basin

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Journal of china University of Geosciences 2002年第3期13卷 252-259页

This paper reports our primary effort in the quantitative reconstruction ofpaleoclimate based on the thrine in phytoecology of the affinity parent plants in the stratigraphicpollen records. The Eocene pollen data come from our former study on the Mingjia borehole 1 in theJianghan basin. The fluctuating trend in the parameter curve of climate shows that the climate inthe Middle Eocene in the Jianghan basin was more or less comparable with that of the present22°―26°N, characteristic of a humid, semi-humid central-southern subtropical climate. The annualtemperature at that time dropped by 1 ℃― 4 ℃ in the Late Eocene, approximately equal to that ofthe present 23°―28°N of northern-central subtropical climate. However, the climate composite atthat time, characterized by higher temperature, small annual range and big fluctuation inprecipitation, was quite different from the present one. The average temperature in January in theMiddle Eocene, higher than that of today, ranged between 5 ℃ and 9 ℃, indicating that no effect ofwinter monsoon occurred in the Middle Eocene, though such an effect may have occurred occasionallyin the Late Eocene. Major temperature decline is recognized at the depth of 2 100 m in the borehole,as was indicated by the decline in average January temperature, the increase in annual range, andthe increase in the deciduous broad-leaved types of trees in the spore-pollen assemblage. The sharpfluctuation in the annual precipitation, usually raging from 300 to 1 700 mm, was favorable for themigration and accumulation of salty deposit. When the precipitation was lower than 1 000 mm,ephemera shrub increased at the same depth as that of the salty deposit. It is, therefore, deducedthat the formation of the salty deposit was attributed mainly to the dry and hot environment in thehigh mountains and deep basins. The small annual precipitation and the intense fluctuation arefavorable for the sustainable accumulation of the salts, which is different from the present

关键词： quantitative reconstruction of paleoclimate annual range function ofthrine in phytoecology fuzzy mathematics eocene jianghan basin

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Estimation of suspended sediment concentration based on bio-optical mechanism and HJ-1 image in Chaohu lake

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Science china Earth Sciences 2010年第S1期53卷 58-66页

作者： WANG Qiao1,2,JIN Xin2,LI YunMei2,WU ChuanQing1,Lü Heng2,WANG YanFei2,ZHANG Hong2,YIN Bin2 & ZHU Li1 1Satellite Environment center,Ministry of Environmental Protection,beijing 100029,china 2Key Laboratory of Virtual Geographic Environment of Education Ministry,Nanjing Normal University,Nanjing 210046,china Satellite Environment center Ministry of Environmental Protection Beijing China Key Laboratory of Virtual Geographic Environment of Education Ministry Nanjing Normal University Nanjing China

Synchronization experiment was conducted in June,2009 to get Inherent Optical Properties(IOP) of water component in Chaohu *** bio-optical mechanism was studied combined with multispectral data of Environmental Satellite 1(CCd),and then inversion models of total suspended matter(TSM),inorganic suspended matter(ISM) and organic suspended matter(OSM) concentration were *** data indicated that:the absorption ratio of suspended particulate matter and CdOM to total were almost no change from band 1 to band 2 with about 85% and 9%,*** ratio of pure water to total increased from 0.4% to 5.6%.Water reflectance in these two bands were influenced by absorption of three kinds of components:algae particles absorption surpassed non-algal particles in band 3,and so played an important role in total absorption with about 35.7%;the proportion of pure water absorption and particles matter backscattering both were 99% in band 4,so these two components decided the main inherent optical properties in band *** models of TSM and ISM concentration inversion based on band combination(band 3 + band 4)/(band 1 + band 2) were built,while OSM concentration was estimated by band 4/(band 1 + band 2) *** by image data,rE of TSM concentration between modeled and measured was 33.4%,and rMSE was 18.68 mg/*** of ISM and OSM concentration were 39.9% and 35.2% *** inversion was more accurate when satellite-ground data were just in the same *** this situation,rE of ISM concentration dropped to 25.4%,and that of TSM and OSM reduced to 26.5% and 26.8% as well.

关键词： HJ-1 Satellite bio-optical property Chaohu lake suspended matter

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