Enhanced bioremediation of crude oil utilizing lipophilic fertilizers combined with biosurfactants and molasses     

Nikolopoulou M  Kalogerakis N 《Marine pollution bulletin》2008,56(11):1855-1861

Many research studies have demonstrated the feasibility and efficacy of fertilization with nitrogen and phosphorus to combat oil spills in marine environments. Rapid dilution of water-soluble nutrients can be overcome by oleophilic formulations that retain optimal nutrient concentrations at the oil-water interface where biodegradation occurs. Previous work has demonstrated that biodegradation processes are enhanced by the addition of lipophilic fertilizers of natural origin (uric acid and lecithin). In this work, we examined the effectiveness of these nutrients in combination with biosurfactants (rhamnolipids) and molasses (source of C and vitamins) to enhance the biodegradation by naturally occurring microorganisms. It was found that the use of biosurfactants resulted in an increased removal of petroleum hydrocarbons (96% removal of C19-C34 n-alkanes within a period of 18 days) as well as in a reduction of the lag phase (almost 80% removal was achieved within the first week of biosurfactant application).  相似文献   

蒙脱石,高岭石与碱性驱替剂作用时矿物间的协同效应研究     

陈忠  沈明道 《矿物岩石》1998,18(3):67-72

在７５℃下系统地研究了蒙脱石、高岭石、以及蒙脱石和高岭石的复配矿物与７＃碱性驱替剂（ρＮａ２ＣＯ３＝１５ｇ·Ｌ－１）间的作用,采用分光光度法对反应后反应液中的硅铝元素质量密度进行了测定,并对两种矿物单独存在时的结果和共存时的进行了比较,结果表明因为蒙脱石在碱性驱替剂中容易析出硅元素,而高岭石在碱性驱替剂中容易析出铝元素,当二者共存时会相互抑制。并且,蒙脱石的存在会对高岭石析出铝元素产生很大的抑制作用,而高岭石的存在对蒙脱石析出硅元素的抑制作用较小,证明蒙脱石更容易与碱液反应而对整个反应起到控制作用。协同效应研究还表明,蒙脱石的作用与其质量不成比例,当加入很少的蒙脱石也会控制整个反应。这些研究对化学驱中化学剂损耗预测模型的建立具有重大的意义。  相似文献   

Toxicity Study of Anti-HABs Agents on Penaeus chinensis     

孙晓霞  张波  俞志明 《海洋通报(英文版)》2001,3(1)

In order to study the effect of anti-HABs agents on Penaeus chinensis, the toxicity experiments on clay, Ca(ClO)2, FeCl3, and AlCl3 to Penaeus chinensis are carried out. The results show that: (1) the clay isn't toxic to Penaeus chinensis; (2) Ca(ClO)2 has no toxicity to Penaeus chinensis at low levels, but has acute and chronic toxicity at high levels; (3) Penaeus chinensis can accumulate Fe and Al. The toxic effect needs further study.  相似文献   

Ledgers and landscapes: Indicators of rural landscape change in southern New Zealand, 1878–1919          下载免费PDF全文

Peter Holland  Sherry Olson 《New Zealand geographer》2017,73(1):45-56

Our objective was to develop and calibrate numerical measures to represent the timing and magnitude of landscape change between 1878, and 1919 using information in a stock and station agency's ledgers. Relative expenditures on fencing materials peaked in the 1880s, were lowest in the early 1900s, and rose to one‐fifth of annual expenditures from 1914 onwards. In contrast, relative expenditures on soil preparation, cropping and harvesting grew steadily after 1879, peaked in 1900, and declined from then until 1919. This research found that periods of intensive landscape investment between 1878 and 1919 were separated by longer intervals of landscape maintenance.  相似文献   

多智能体系统的群集行为研究综述     

胡鸿翔  梁锦  温广辉  虞文武 《南京气象学院学报》2018,10(4):415-421

近些年来,多智能体系统的群集行为分析已成为复杂网络领域的一个研究热点.本文从个体内部动力系统与个体间的拓扑结构这两个因素出发,对多智能体系统的群集行为问题的发展现状进行概述,并对相应的分布式协议、收敛速度以及实现的条件做了介绍和分析.最后,结合目前的研究现状,讨论了群集行为未来的研究方向.  相似文献   

Factors Controlling Localization of Unconformity-related Uranium Deposits in the Proterozoic Athabasca Basin, Canada     

CHI Guoxiang  CHU Haixi  Ryan SCOTT  LI Zenghu  Kathryn BETHUNE 《《地质学报》英文版》2013,87(Z1):687-688

  相似文献   

Bioconcentration of triclosan and methyl-triclosan in marine mussels (Mytilus galloprovincialis) under laboratory conditions and in metropolitan waters of Gulf St Vincent,South Australia     

Rai S. Kookana  Ali Shareef  Milena B. Fernandes  Sonja Hoare  Sam Gaylard  Anu Kumar 《Marine pollution bulletin》2013

The anti-microbial agent triclosan (TCS), and its derivative methyl-triclosan (Me-TCS), are discharged with treated effluents from wastewater treatment plants to receiving environments. We investigated the bioconcentration of TCS and Me-TCS in mussels (Mytilus galloprovincialis) exposed to TCS (100 ng L⁻¹) for 30 days in seawater aquaria (19 ± 2 °C) with fresh phytoplankton as a food source. Bioconcentration increased with time reaching a steady-state around 24–30 days. The bioconcentration factor (log BCF) for TCS were 2.81 L kg⁻¹ (dry weight) and 4.13 L kg⁻¹, when lipid normalised concentrations were used. Mussels were also deployed in cages at four marine locations receiving effluents from WWTPs. The mean (±SD) TCS and Me-TCS concentrations for mussels from these sites were 9.87 (±1.34) and 6.99 (±2.44) μg kg⁻¹. The study showed that mussels can be a useful tool for monitoring pollution of TCS and Me-TCS in marine and estuarine environments.  相似文献   

社区视角下的农业文化遗产保护与旅游发展（英文）   总被引：1，自引：0，他引：1  

孙业红  王静  刘某承 《资源与生态学报(英文版)》2013,4(3):258-266

农业文化遗产中蕴含的丰富生物多样性和文化多样性是在当地社区的传统生活中不经意间保留下来的。这些生物多样性和文化多样性同时也是很好的旅游资源,通过旅游发展既能维持当地居民的生计,同时也可以有效保护农业文化遗产。本文以全球重要农业文化遗产——贵州从江县稻鱼鸭复合系统为例,讨论了农业文化遗产保护与旅游发展中的社区参与问题。构建了基于社区的农业文化遗产保护及旅游发展的概念模型,其核心观点为农业文化遗产在保护和社区适应方面是一个动态的过程。模型中的6个主要因子分别为:农业文化遗产社区、传统农业系统、生物多样性、文化多样性、可持续旅游发展、社区生计和社区文化身份。几个因子之间的作用是互相影响的,因此支持了农业文化遗产的保护以及农业文化遗产地的旅游发展。  相似文献   

Gatekeeping Night Spaces: the role of booking agents in creating ‘local’ live music venues and scenes     

Ben Gallan 《The Australian geographer》2012,43(1):35-50

A complex relationship exists between music scenes and the infrastructure in which they are located. This article focuses on the rise and fall of the Oxford Tavern, a live music venue in the Australian city of Wollongong. Pivotal in this venue was the role that booking agents played in developing what they perceived as an inclusive, self-sufficient and vibrant music scene—by generating and then consistently implementing a strict philosophy on what music and which bands performed there. Bookings were not based on reputation, and potentially better known or more lucrative bands were regularly denied access in favour of ‘local’ bands socially connected to the music scene. These bands were authenticated as ‘local’ because of social and geographical proximity—not because of any innate musicological distinctiveness connected to Wollongong. This social geographical emphasis on ‘local’ and ‘original’ music transcended musical genre and subcultural style. Although in one sense ‘exclusionary’, gatekeeping also fostered bonds of community and belonging, creating a perceived haven for diverse local cultures within a monopolised urban nightscape. Such gatekeeping practices—explored here through interviews with booking agents and music scene participants—were pivotal to the longevity of the music venue and scene. Only when booking agents with a strong ‘local’ ethos were removed from the venue did it struggle to survive, and ultimately collapse.  相似文献   

不同类型水处理剂对马海盐湖高不溶物钾盐矿浆的絮凝沉降及过滤性能研究          下载免费PDF全文

马金元  李海民  边红利  张全有 《盐湖研究》2012,20(1):40-43

研究了焦磷酸钠、三氯化铁、硫酸铁、硅酸钠、丙酮、十二烷基硫酸钠、十二烷基苯磺酸钠、聚乙二醇等一些水处理剂与非离子聚丙烯酰胺组合后对马海盐湖高不溶物、低品位固体钾矿矿浆的絮凝沉降效果,找出了对钾矿矿浆絮凝沉降、过滤分离有较好效果的药剂组合。  相似文献