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Zinc and Lead Biosorption by Delftia tsuruhatensis: A Bacterial Strain Resistant to Metals Isolated from Mine Tailings

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Journal of Water Resource and Protection 2012年第4期4卷 207-216页

作者： Dorian A. Bautista-Hernández Landy I. Ramírez-Burgos Enrique Duran-Páramo Luis Fernández-Linares Faculty of Chemistry Programa de Ingeniería Química Ambiental y Química Ambiental PIQAyQA Universidad Nacional Autónoma de México México City México Laboratory of Bioprocesses Department of Bioprocesses Unidad Profesional Interdisciplinaria de Biotecnología UPIBI-Instituto Politécnico Nacional México City México rearch centre for environmental quality Instituto Tecnológico de Estudios Superiores de Monterrey Campus Estado de México Atizapán de Zaragoza México

A bacterial strain capable of Zinc and Lead biosorption was isolated from mine tailings. This strain showed the highest minimum inhibitory concentrations (MIC) of metals among other isolates in metal-resistance tests. Sorption tests were conducted placing 0.015 g of dry biomass in 10 ml of metallic solution at fixed pH. Contact was analyzed at different times (kinetics) and different initial concentrations (isotherm). The biomass was separated by centrifugation and the concentration of non-absorbed metal was determined using atomic absorption spectroscopy. The strain was identified by 16S sequencing as Delftia tsuruhatensis. The order of toxicity of the metals to the bacterium was Zn > Pb > Se > Ni > Cu = Al. Zinc and Lead absorption kinetics were adjusted to the pseudo second order equation (r2 = 0.99), showing that equilibrium was reached at 40 and 20 min, respectively. Maximal absorption of Pb and Zn was 0.216 and 0.207 mmol?g–1, respectively;which can be considered a median magnitude capacity when compared to other biosorbents described in the literature.

关键词： Biosorption Langmuir and Freundlich Isotherms Delftia Tsuruhatensis Pb(II) Zn(II)

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A Case Study:Distribution of Bacterial and Fungal Aerosols in Air-Conditioning Systems in Shaanxi History Museum

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湖南大学学报（自然科学版） 2009年第S1期36卷 10-14页

作者： LI An-gui,HOU Juan-juan,JI Zeng-bao,ZHU Xiao-bin(School of environmental & Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China) School of environmental and Municipal Engineering Xi'an University of Architecture and Technology Xi'an 710055 China

In order to investigate the bacteria and fungi aerosol characteristic distribution in HVAC-system and its components at Shaanxi History Museum.Measurements were performed to probe the bacteria and fungi aerosol in HVAC systems,located at Xi'an city,China.The results showed that there was fungi growth inside the ventilation ducts,fungi contamination was worse than bacteria,and both of them were distributed into occupied space with the air supply ducts.The dominating genera of fungi was found to be Penicillium spp.and Aspergillus spp.,which was respectively 46.1% and 20.7% in settling fungi,and the dominating genera of fungi in dust were Cladosporium spp.and Penicillium spp.,which was 41.8% and 30.1% respectively.It suggests that available measures to improve and control the performance of HVAC-systems such as the maintenance,management and cleaning should be taken to prevent this pollution and to develop strategies to keep this pollution away.

关键词： central air conditioning microbe bacteria fungi contamination field experiment

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Holocene climate variation denoted by Barkol Lake sediments in northeastern Xinjiang and its possible linkage to the high and low latitude climates

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Science China Earth Sciences 2011年第4期54卷 603-614页

作者： XUE JiBin & ZHONG Wei 1 School of Geography,South China Normal University,Guangzhou 510631,China 2 Key Laboratory of Oasis Ecology(Ministry of Education) ,Xinjiang University,Urumqi 830046,China 3 Key Laboratory of Western China's environmental Systems(Ministry of Education) ,Lanzhou University,Lanzhou 730000,China School of Geography South China Normal University Guangzhou China Key Laboratory of Oasis Ecology (Ministry of Education) Xinjiang University Urumqi China Key Laboratory of Western China’s environmental Systems (Ministry of Education) Lanzhou University Lanzhou China

The climate over the closed inland Barkol Lake,which is located in northeastern Xinjiang Uygur Autonomous Region,is significantly influenced by westerly winds today.To improve our understanding of past climate processes in westerly wind influenced regions in northwestern China,a 250-cm sediment section was retrieved from this lake.After taking the carbon reservoir effect into consideration,the chronological sequence of this section was reconstructed based on seven conventional radiocarbon dates of bulk samples,and the bottom age of this section was determined to be about 9400 cal a BP.Multi-proxy datasets,includingδ18O car,δ13C car of authigenic carbonate,and total organic carbon were examined using wavelet analysis and singular spectrum analysis methods.Results show that the Holocene in the Barkol Lake region can be divided into four stages:(1) a cold and dry early stage before～8000 cal a BP;(2) a moderately warm and wet middle stage between～8000 and 6000 cal a BP;(3) a warm and dry stage,along with a cooling-wetting tendency from 6000 to 2700 cal a BP;and(4) a fluctuating cooling and wet stage between 2700-800 cal a BP,and a drier stage since 800 cal a BP.The general trend of Holocene climatic changes revealed by Barkol Lake sediments was in agreement with that of adjacent regions.We infer that climatic changes during the Holocene in the Barkol Lake region were influenced not only by high latitudes,especially the North Atlantic region climate,but also tropical low-latitude processes,such as the El Nio/La Nia-Southern Oscillation.This study demonstrates that the enhanced activities of ENSO may have played an important role in climatic changes in northeastern Xinjiang during the Holocene.Our results also suggest that climatic patterns may be temporally different in the northern Xinjiang area in response to the changing predominant control of either the Westerly or the Asian summer monsoon,depending on the contrast of their relative strengths.

关键词： Barkol Lake Holocene climate change tropical processes northern high-latitude climate

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