埕北油田聚合物的筛选与性能评价     

刘义刚  ;山金城  ;卢祥国  ;赵兰兰 《海洋地质译丛》2009,(2):38-41

埕北油田具有原油黏度高、油层渗透能力强和非均质性严重等特点,水驱开发效果差,剩余油储量大。目前,埕北油田综合含水90%,采出程度30%左右,而生产平台工作时间已达到设计使用寿命,急需高效、快速的开发技术。针对埕北油藏地质、流体性质和开发现状,利用室内仪器检测和理论分析方法,开展了聚合物筛选和聚合物性能评价,利用模糊综合评判方法对聚合物进行了优选,推荐使用中国石油大庆炼化公司生产＂抗盐＂和＂超高＂部分水解聚丙烯酰胺。  相似文献   

内蒙古包头某铁矿尾矿库生态修复的植物优选研究          下载免费PDF全文

杨伟龙  白宇明  李永利  胡浩远  杜鑫 《中国地质》2022,49(3):683-694

【研究目的】植物修复技术因其具有绿色、经济、环保的特点,在矿山生态修复中应用广泛,而调查和筛选矿山周边适应本地生境的植物物种是进行植物生态修复的关键环节。【研究方法】通过野外调查取样和室内分析测试相结合的方法,对内蒙古包头某废弃铁矿尾矿库及周边11种优势植物的重金属含量、重金属迁移富集能力及其上覆土壤重金属特征进行分析研究,以期筛选优良修复植物,为矿区生态修复提供科学依据。【研究结果】该废弃铁矿尾矿库及周边土壤Fe、Mn、Cu、Pb、Zn、Cr、Cd、F含量均远超过河套平原土壤背景值,地累积指数显示污染等级为2～7级,污染程度从轻—中度污染到极强度污染。植物地下部分各元素含量总体上高于地上部分,除Cu外各植物重金属含量大多超出了正常值范围。【结论】沙蒿和独行菜具有富集型植物特征,玉米、狗尾草、虎尾草和拂子茅属于根部囤积型,碱蓬、灰条菜、苍耳、新疆杨和红柳符合规避型植物特征。可根据植物对重金属的吸收和富集特点,科学合理地选择适宜的植物进行矿区受污染土壤植物修复。创新点：研究了废弃铁尾矿库及周边11种优势植物的重金属特征;揭示了优势植物对重金属的吸收机制。  相似文献   

秀丽隐杆线虫在环境内分泌干扰物研究中的应用     

汝少国  宫鑫  孙长青 《海洋湖沼通报》2015,(1):21-27

模式生物秀丽隐杆线虫(Caenorhabditis elegans)具有繁殖速度快、世代周期短,通体透明、体细胞数目恒定,基因组小并被完全测序等优点,已经广泛地应用于生态毒理学研究。C.elegans的胚胎发育、蜕皮、繁殖等重要生理过程是通过激素调控的,外源激素的代谢产物可以作为核受体(NRs)的配体,C.elegans的寿命与胰岛素/胰岛素样生长因子信号(IIS)通路和固醇/类固醇信号通路密切相关。近年来已经建立了在分子、细胞、个体和种群水平上,利用vit-2、hsp、消化道与性腺、产卵数、胚胎发育时间、内禀增长率、性别比例等系统地筛选EDCs的指标体系。以C.elegans为模式生物,从线虫的蜕皮、IIS通路等角度探讨了EDCs对线虫寿命的影响及作用机制,并展望了C.elegans在EDCs导致的细胞增殖与细胞分化失调而诱发的癌症、糖尿病等研究中的应用前景。  相似文献   

Construction and screening of a functional metagenomic library to identify novel enzymes produced by Antarctic bacteria     

Ignacio Ferrés  Vanesa Amarelle  Francisco Noya  Elena Fabiano 《极地研究(英文版)》2015,(1)

A metagenomic fosmid library of approximately 52 000 clones was constructed to identify functional genes encoding cold-adapted enzymes. Metagenomic DNA was extracted from a sample of glacial meltwater,...  相似文献   

对虾白斑综合症病毒极早期基因启动子筛选文库的构建     

林梵宇  徐丽美  杨丰 《台湾海峡》2010,29(2):184-188

对虾白斑综合症病毒（white spot syndrome virus,WSSV）是危害对虾养殖业的主要病原,而WSSV极早期基因对病毒功能基因的转录翻译和调控起着至关重要的作用.本研究将WSSV基因组以超声法随机断裂至400～900bp DNA片段,并插入启动子缺失且多克隆位点下游具有报告基因的载体来构建文库,转染昆虫细胞Hi5.倒置荧光显微镜观察发现部分转染后的细胞有增强型绿色荧光蛋白（EGFP）的表达,表明这部分细胞中的DNA片段可能具有极早期启动子活性.流式细胞仪分析显示,这部分荧光细胞占总细胞的比例为0.35%.由于转染效率为50%,可认为占比0.7%的WSSV基因组随机片段能在Hi5细胞中激发下游报告基因的转录翻译,可能具有极早期基因启动子活性.这对于进一步筛选和鉴定WSSV极早期基因及开展极早期启动子研究具有重要的意义.  相似文献   

The selection of alkaline protease-producing yeasts from marine environments and evaluation of their bioactive peptide production     

LI Jing  CHI Zhenming  WANG Xianghong  PENG Ying  CHI Zhe 《中国海洋湖沼学报》2009,27(4)

  相似文献   

调频加网中的随机问题   总被引：2，自引：0，他引：2  

苏永宪 《测绘学院学报》2001,18(3):226-228

调频加网是印刷中最新发展的一项极其重要的技术，它对于提高印刷品质量有着非常重要的作用。随机数产生的速度和质量决定着调频网点的质量，文中主要讨论了调频加网算法中随机数的产生以及随机数发生器的设计，重要讨论了乘同余随机数发生器。  相似文献   

Seismic vulnerability assessment of earthquake-prone mega-city Shillong,India using geophysical mapping and remote sensing     

Saurabh Baruah  Goutam Kashyap Boruah  Sangeeta Sharma  Washim Akram Hoque  Timangshu Chetia  Chandan Dey 《Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards》2020,14(2):112-127

ABSTRACT

The concept of seismic vulnerability is a yard-stick of damage estimation from a probable earthquake considering physical cum social dimension and enables a basis for decision-makers to develop preparedness and mitigation strategies. We aim at vulnerability assessment of the typical urban system of capital city Shillong situated on hilly terrain. High-resolution satellite imagery of Shillong facilitates analysis of building footprints, communication network, and open ground. Different building typologies are identified taking into account the building’s structural configuration assessed through a rapid visual survey of more than 15% of total residential households. Slope map demarcates the landslide-prone area through discrete elevation modelling. A methodology incorporating several parameters e.g. building typology, slope angle, shear wave velocity characteristics, geomorphology, and the number of occupants in correlation with a physical measurement of vulnerability is presented and is applied to estimate the dimension of vulnerability. Additionally, MASW survey indicates lithology up to 30?m deep along with the existence of stiff soil and rocks at different depths whereas resonant frequency is identified to be in the range of 6–8?Hz through H/V ratio. Integrating all, it is observed that more than 60% of Shillong city falls under moderate to higher vulnerability and the rest is less vulnerable.  相似文献   

Acclimatization and screening of a chloramphenicol-degrading strain     

Xuanwen LU Xueqin TAO Zhi DANG 《中国地球化学学报》2006,25(B08):115-116

Chloramphenicol （CAP） is an antibiotic commonly used in aquaculture as a prophylactic or disinfectant to prevent diseases, or as a chemotherapeutic agent to control diseases. This antibiotic is either spread directly in the aquatic environment or administered through medicated feeds. It may be directly exposed to or enter the environment by leaching from uneaten feeds or from the aquatic animals＇ excrements. The antibiotic also directly enters the environment through pharmaceutical wastewater. Toxicity of CAP to human bone marrow has been linked to fatal aplastic anemia. Antimicrobial residues enter the environment, which may also establish a selective pressure in favour of antimicrobial-resistant bacteria. The residues of antibiotics may pose potential risk to public health or increase the occurrence of antibiotic-resistant bacteria in the aquatic environment. Due to these perceived risk, treatment of CAP in farm animals intended for human consumption has been restricted. However, residue of CAP in the environment is still a concern. There have been some reports on the residual effects of CAP on aquaculture and on microbial resistance to CAP in certain environments. The biotransformation of CAP in aquaculture pond sediments has been reported, which indicated that salinity is one of the many environmental factors that affect the degradation of CAP. However, acclimatization and screening of dominant bacteria for biodegrading CAP have been rarely studied. This paper studied the microbial degradation of CAP. In order to screen the dominant bacteria for degrading, the source of bacteria was sampled from the aquaculture pond sediments of Baiyun Borough, Guangzhou, China. 60 mg/L CAP was used as a sole carbon source to screen CAP-degrading bacteria and the dominant bacteria were acclimated after 2 months.  相似文献   

甘肃武山地区地下流体化学与构造应力关系初探     

王非 《内陆地震》1996,10(3):263-268

结合水氧、应力观测资料对甘肃武山地区地下流体化学特征（水化学、气体化学）与构造应力关系进行了定量计算并给出了二者之间的数学关系。  相似文献