检索结果-南通市图书馆

Ultrastructural Evidence for a Novel Accumulation of Ca in a Microbial Mat from a Slight Acidic hot spring

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2010年第3期84卷 624-631页

作者： PENG Xiaotong ZHOU Huaiyang YAO Huiqiang, LI Jiangtao WU Zijun State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China

Microbial mats are ecosystems that can control or induce the precipitation of calcium（Ca） carbonate on Earth through geological time.In the present study,we report on a novel accumulation of Ca,together with iron（Fe）,in a microbial mat collected from a slight acidic hot spring（pH=5.9） in south China.Combining an array of approaches,including environmental scanning electron microscopy,X-ray microanalysis,transmission electron microscopy,and selected area electron diffraction,we provide ultrastructral evidence for amorphous acicular aggregates containing Ca and Fe associated with cyanobacteria precipitating in the microbial mats.Cyanobacterial photosynthesis and exopolymeric organic matrixes are considered to be responsible for the precipitation of Ca.These amorphous acicular aggregates might imply the early stage of calcification occurring in microbial mats.Ca and Fe coprecipitation indicates another potential important way of inorganic element precipitation in hot spring microbial mats.Our results provide insight into the possible mechanism of cyanobacterial calcification and microfossil preservation in slight acidic hot spring environments.

关键词： cyanobacteria calcification hot spring microbial mat microfossil preservation

Phylogenetic Characterization of BKH3 Bacterium Isolated from a hot spring Consortium of Bakreshwar (India) and Its Application

在线全文

学校读者我要写书评

暂无评论

Advances in Microbiology 2016年第6期6卷 453-461页

作者： Biswadeep Chaudhuri Nurul Alam Manas Sarkar Trinath Chowdhury Brajadulal Chattopadhyay Department of Physics Jadavpur University Kolkata India

Background: The silica leaching attribute of some of the mystifying bacteria present in the cluster of hot springs (temperatures range 35°C - 80°C) at Bakreshwar (West Bengal, India, 23°52'48"N;87°22'40") has provided some significant advancements in construction technology when incorporated to the concrete/mortar specimens. The present investigation was designed to isolate other novel bacterial strains from 65°C hot spring that could have similar or better performance in construction technology. Methods: Soil sample collected from the 65°C hot spring was inoculated to the culture vials (incubated at 65°C) containing a specific synthetic growth medium (pH 8.0) to grow the bacterial population anaerobically by degassing the medium with CO2 gas. Subsequent serial dilution techniques were employed to isolate pure culture of a specific bacterial strain. 16S rRNA gene sequence and phylogenetic analysis was carried out to identify the novelty of the isolated bacterial strain. The isolated bacteria were incorporated to the cement sand mixture at various cell concentrations to evaluate the efficacy of the strain in construction technology. Results: The work revealed the presence of a novel bacterial strain (BKH3;GenBank Accession No.: KP 890928) within the same hot spring consortium whose 16S rRNA gene sequence data showed 96% identity with Citrobacter freundii bacterial species. The newly isolated bacteria when incorporated at different cell concentration to the cement/cement-sand mixture were found to possess the similar compressive strength increment property, the cracks repairing ability and the water ingression resistivity. It also reduced the permeability of sulphate ions to the cementitious matrix reflecting the increment of durability of the incorporated material. Conclusions: The enhancement of compressive strength and durability of the as prepared bio-concrete material by using the isolated bacterial strain (BKH3) was due to the silica leaching activity of the bioremediase

关键词： Bioconcrete Compressive Strength hot spring 16S rRNA Phylogenetic Analysis

Removal of Lead Contamination through the Formation of Lead-Nanoplates by a hot spring Microbial Protein

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Microbiology 2021年第11期11卷 681-693页

作者： Chetana Ghosal Nurul Alam Abiral Tamang Brajadulal Chattopadhyay Department of Physics Jadavpur University Kolkata India

Lead contamination still remains as serious threat to public health and environment because of its non-biodegradability and toxicity. A clean technique has been developed for removal of lead contamination through the formation of lead-oxide nanoplates using a bacterial protein (Molecular weight ~30 kDa) as biological template. The isolated hot-spring bacterial (the bacterium was named as MDH1) protein when adding to the solution of lead compound (e.g., lead nitrate), nanoplates of lead-oxide are formed as viewed by electron microscope. The as prepared lead-oxide-nanoplates are characterized by Inductively Coupled Plasma analysis, Energy Dispersive X-ray Spectroscopy and X-ray diffraction analyses. The lead-oxide-nanoplates and the filtered supernatant of the reactive solution both were separately used to observe the inhibition of growth of E. coli bacteria on culture plate. Lead-oxide-nanoplates produced clear zone of inhibition on the bacterial growth plate, whereas the filtered supernatant exhibited no such zone on the growth of E. coli bacteria revealing the fact that lead contamination was removed from the filtered supernatant. The prepared lead oxide nanoplates also possess dye degradation activity which is the added advantage of the process. The MDH1 bacterial protein acts as biological template which successfully removes lead contamination from lead-solution. The process is a clean and cost-effective one which can be used not only for removal of lead contamination but also for removal of different dyes from environment due to having dye-degradation attribute of the lead-oxide nanoplates.

关键词： Bacteria hot spring Protein Dye Degradation Lead-Oxide Nanoplates

Analysis on the Industrial Development Plan of the Tribal hot spring Demonstration Area in Taiwan’s Indigenous Areas

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2021年第1期11卷 58-71页

作者： Hsiao-Ming Chang Chin-Lung Chou Mao-Chun Chiu School of Physical Education Putian University Putian China Department of Tourism Leisure and Health Ching Kuo Institute of Management and Health Keelung Taiwan China Department of Recreational and Sport Management Tajen University Pingdong Taiwan China

Under the impact of modern life, the traditional culture of Taiwan’s indigenous tribes is not only affected, because the traditional life is not easy and employment is difficult, which also causes the outflow of tribal population. Therefore, after the establishment of the Taiwan Council of indigenous people (TCIP), tourism development has been listed as an important policy, and it wants to use tourism development to improve the lives of indigenous people and enhance the ability of tribal economic development. The purpose of this study is to analyze the advantages and disadvantages of TCIP in developing tribal hot spring demonstration areas in indigenous areas. This study adopts the method of case study to investigate by means of document analysis, field interview and observation. The results of SWOT analysis show that: 1) Advantages: the indigenous tribes are rich in natural resources and have unique cultural characteristics. 2) Weakness: when indigenous people invest in hot spring industry, they will face difficulties in obtaining development funds, lack of land use and hot spring management talents. 3) Opportunities: Because of the prevailing leisure culture in Taiwan, coupled with the relevant laws and policies and plans of the indigenous people, it is guaranteed that the indigenous people can participate in the development plan of the hot spring demonstration area. 4) Threats: The development of the existing hot springs in the indigenous villages and towns is mostly invested by the Han people, so it is difficult for the indigenous people to compete with them. Moreover, they lack the management ability and guidance to enter the competitive market of hot spring development.

关键词： hot spring Tribal Tourism Industrial Development Indigenous

Degassing of deep-sourced CO_(2) from Xianshuihe-Anninghe fault zones in the eastern Tibetan Plateau

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2022年第1期65卷 139-155页

作者： Sheng XU Lufeng GUAN Maoliang ZHANG Jun ZHONG Wei LIU Xian'gang XIE Congqiang LIU Naoto TAKAHATA Yuji SANO Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China Atmosphere and Ocean Research Institute The University of TokyoKashiwaChiba 277-8564Japan

A large number of gases are releasing from the medium-high temperature geothermal fields distributed along the large-scale strike-slip fault zones in the southeastern margin of the Tibetan Plateau.In this study,11 hot spring water and the associated bubbling gas samples were collected along the Xianshuihe-Anninghe fault zones(XSH-ANHFZ)and analyzed for chemical and isotopic compositions.The δ^(18)_(H_(2)O) and δD_(H_(2)O) values indicate that hot spring waters are predominantly meteoric origin recharged from different altitudes.Most water samples are significantly enriched in Na^(+) and HCO_(3) due to the dissolution of regional evaporites,carbonates and Na-silicates.^(3)He/^(4)He ratios of the gas samples are 0.025-2.73 times the atmospheric value.The ^(3)He/^(4)He ratios are high in the Kangding region where the dense faults are distributed,and gradually decrease with increasing distance from Kangding towards both sides along the Xianshuihe fault zones(XSHFZ).Hydrothermal fluids have dissolved inorganic carbon(DIC)concentrations from 2 to 42 mmol L^(-1),δ^(13)C_(DIC) from -6.9‰ to 1.3‰,δ^(13)C_(CO_(2)) from -7.2‰ to -3.6‰ and Δ^(14)C from -997‰ to -909‰.Combining regional geochemical and geological information,the CO_(2)sources can be attributed to deep-sourced CO_(2)from mantle and metamorphism of marine carbonate,and shallow-sourced CO_(2)from the dissolution of marine carbonate and biogenic CO_(2).The mass balance model shows that 11±6% of the DIC is sourced from the dissolution of shallow carbonate minerals,9±8% formed by pyrolysis of sedimentary organic matter,80±9% derived from deep metamorphic origin and mantle-derived CO_(2).Among them,the deep-sourced CO_(2)in Anninghe fault zones(ANHFZ)is merely metamorphic carbon,whereas ca.12% and ca.88% of the deep-sourced CO_(2)in the XSHFZ are derived from the mantle and metamorphic carbon,respectively.The average deep-sourced CO_(2)flux in the Kangding geothermal field is estimated to be 160 ta^(-1).If all the hot springs in various fault zones in the southeaste

关键词： hot spring Fluid geochemistry Deep-sourced carbon Xianshuihe-Anninghe fault zones Tibetan Plateau

Three-dimensional S-wave velocity structure of the upper crust in the Guangdong-Hong Kong-Macao Greater Bay Area:insights into the basins structure and genesis of hot springs

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第2期41卷 575-591页

作者： Yingchen LIU Shaohong XIA Changrong ZHANG Xinyang WANG Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China

As one of the four largest bay areas with strong economic activities in the world,the Guangdong-Hong Kong-Macao Greater Bay Area(GHMGBA)is located in the zone of interaction between the South China Block(SCB)and the South China Sea(SCS).Under the influence of complex geologic evolution,basin-range structures,fault systems and hot springs are well developed here.However,the characteristics of geological structures and the genetic mechanism of these geological phenomena are still unclear.Therefore,we performed ambient noise tomography to obtain 3-D upper crust(0-7.5 km)S-wave velocity structures of the GHMGBA by using 40-day continuous waveform data from 130 seismic stations in the GHMGBA.Our results show that sedimentary basins in the GHMGBA are mainly characterized by low-velocity anomalies.S-wave velocities of sediment formation in basins are about 2.8-3.1 km/s.Rapid changes in velocity appear at the edges of the basins,which correspond to the NE-,NEE-,and NW-trending faults,indicating prominent basin-controlling effects of the faults.The Sanshui Basin(SSB),the largest in the GHMGBA,has a developmental depth of about 4 km,and there is a significant difference in velocity gradient between the east and west sides of the basin,indicating that SSB has experienced east-west asymmetric expansion.Moreover,there are prominent low-velocity anomalies at a depth of about 4.5 km beneath the hot springs at the west of the Zhujiang(Pearl)River estuary(ZRE).We infer that the low-velocity anomalies are fluid reservoirs of the hot springs,which lead to the development of the hot springs on the surface.In addition,the distribution of main cities in the GHMGBA shows a spatial correlation with low-velocity areas at shallow depths(<3 km).The population development trend in the GHMGBA in the past 20 years is also mainly concentrated in the structural province of relatively low-velocity.In combination with the GHMGBA basin structures and drainage distribution characteristics,we suggest that the basic geological environment to some ext

关键词： Guangdong-Hong Kong-Macao Greater Bay Area(GHMGBA) ambient noise tomography crustal structure basin hot spring

Geothermal anomalies in the Xianshuihe area: Implications for tunnel construction along the Sichuan-Tibet Railway, China

在线全文

学校读者我要写书评

暂无评论

地下水科学与工程:英文版 2023年第3期11卷 237-248页

作者： Feng Liu Wei Zhang Gui-ling Wang Shuai-chao Wei Chen Yue Guang-zheng Jiang Yu-zhong Liao Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological ScienceShijiazhuang 050061China China University of Geosciences(Beijing) Beijing 100083China Technology Innovation Center of Geothermal&hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China Chengdu University of Technology Chengdu 610059China

This study presents a comprehensively analysis of geothermal characteristics in the Xianshuihe geothermal area along the Sichuan-Tibet Railway,using temperature logging,temperature monitoring and thermal conductivity measurement,and regional geothermal geological survey data.The research focuses on the geothermal background,geothermal field,and their potential impact on the surrounding tunnels.The investigation reveals that the average heat flow value in the study area is approximately 73.0 mW/m^(2),significantly higher than the average terrestrial heat flow in China's Mainland(62.5 mW/m^(2)).This high terrestrial heat flow signifies a distinct thermal background in the area.In addition,geothermal anomalies in the area are found to be closely associated with the distribution of hot springs along NW faults,indicating a strong control by the Xianshuihe fault zone.The study concludes that the region's favorable conditions for geothermal resources are attributed to the combination of high terrestrial heatflow background and water-conducting faults.However,these conditions also pose a potential threat of heat damage to the tunnels along the Sichuan-Tibet Railway.To evaluate the risk,the research takes into account the terrestrial heat flow,thermal conductivity of the tunnel surrounding rocks,characteristics of the regional constant temperature layer,as well as the distribution of hot springs and faults.The analysis specifically focuses on the thermal damage risk of Kangding 1# tunnel and 2# tunnel passing through the study area.Based on the findings,it is determined that Kangding 1# tunnel and 2# tunnel have relatively low risk of heat damage,as they have avoided most of the high temperature anomaly areas.However,several sections of the tunnels do traverse zones with low to medium temperatures,where surface rock temperatures can reach up to 45℃.Therefore,these regions should not be neglected during the construction and operation of the tunnel project,and mitigation measures may be necessary to address the potential he

关键词： Xianshuihe geothermal zone Terrestrial heat flow hot spring Tunnel Heat damage

Characteristic Solutes in Geothermal Water from the Rehai Hydrothermal System,Southwestern China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth Science 2015年第1期26卷 140-148页

作者： Mingliang Liu Qinghai Guo Xiaobo Zhang Yanxin Wang School of Environmental Studies China University of Geosciences State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences

Rehai, a high-temperature hydrothermal system located in the southern part of the Tengchong volcanic geothermal area of Yunnan Province, is characterized by intensive hydrothermal activities. The hot springs at Rehai that have been sampled so far are Na-HCO3-Cl or Na-HCO3 springs except for the one at Diretiyanqu （experience geothermal area） which is an acid sulfate spring. As typical characteristic solution constituents in high-temperature hydrothermal systems with magma as heat source, CI, B and As in the Rehai geothermal waters originate mainly from the addition of magmatic fluid. However, both the mixing of magmatic fluid and the dissolution of reservoir hostrocks contribute to the enrichment of fluoride in the Rehai geothermal waters, although their fluoride concentrations are primarily controlled by the solubility of fluorite as indicated by a clear negative relation between solution fluoride and calcium concentrations. The much higher concentration of SO4^2- in the Diretiyanqu spring as compared to the other springs outcropping at Rehai implies a quite different geochemical genesis for this spring. The H2S-rich vapor, separated from the deep geothermal fluid during boiling process （i.e., adiabatic cooling）, can ascend to shallow aquifers where it is mixed with cold groundwaters and oxidized. Acid sulfate-rich hot springs are generally formed in this manner although only one spring of this type has been samnled during the field investigation of this studv.

关键词： hot spring characteristic constituent magmatic fluid fluid-hostrock interaction Rehai.

Aqueous Chemistry of Typical Geothermal springs with Deep Faults in Xinyi and Fengshun in Guangdong Province,China

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2015年第1期26卷 60-72页

作者： Guoping Lu Runfang Liu State Key Laboratory of Biogeology and Environmental Geology School of Environmental StudiesChina University of Geosciences

This paper investigated aqueous chemistry for two geothermal spring groups responsive and sensitive to flow fluctuations induced by earthquakes. Quake monitorings are favored for their being in residential areas with well-preserved natural flow systems in Xinyi City＇s Xijiang hot springs and Fengshun County＇s Shihu hot spring. The hot springs are typical in temperatures and flow rates in southern China＇s Guangdong Province. Physical and chemical conditions deep down in the heat sources are important constraints on earthquake, fluid flow, reactive solute transport and heat transfer, but remain challenging to address via field observations and numerical experiments. In this paper, we made daily and annual observations on flow rates, temperature, and/or aqueous chemistry. We employed strontium isotopes as tracers for the water sources, equilibrium phase diagram for K-feldspar and albite stability, and Na-K-Mg diagram for heat reservoir temperatures. The abundant sulfite content in Xi- jiang hot springs is discussed. Our main finding are that the deep fault springs are characterized by low reduction-oxidation potential at around -200- -150 mV and relatively large daily flow variations. The resuits provide scientific background features on the field sites regarding earthquake monitoring and predictions and geothermal reservoir.

关键词： geothermal hot spring aqueous geochemistry earthquake monitoring geothermal reservoir temperature reduction oxidation potential Xinyi Fengshun.