含油气盆地中甲烷的成因和运移理论     

Gould  ML 刘海龄 《南海研究与开发》1992,(3):79-81

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Environmental perception,decision processes,and population movement: a review of geographical studies     

Gentileschi ML 《Rivista geografica italiana》1980,87(1):61-74

The author reviews a selection of studies on the behavioral aspects of migration, with emphasis on the process leading up to the decision to migrate. The focus of this review is not on the short-term factors leading to the actual migration decision but on the background factors that lead to the contemplation of migration. The perception by potential migrants of the environment in which they are living as opposed to that of the place to which they might move is considered. (summary in ENG, GER)  相似文献   

A geographical interpretation of an attempt at migratory regionalization in Italy     

Gentileschi ML  Slater PB 《Rivista geografica italiana》1980,87(2):133-150

In the first part, the authors review a group of studies dealing with the identification of regional differences in Italian migratory patterns, especially using the concept of migration field. The second part is devoted to a study of the hierarchical clustering of Italian provinces using 1973 inter-provincial migratory flow data. (summary in ENG, FRE)  相似文献   

Comparative oxygen radical formation and toxicity of BDE 47 in rainbow trout cell lines   总被引：2，自引：0，他引：2  

Shao J  Eckert ML  Lee LE  Gallagher EP 《Marine environmental research》2008,66(1):7-8

The polybrominated diphenyl ethers (PBDEs) constitute a class of flame retardants whose residues have markedly increased in fish and human tissues during the last decade. In particular, the levels of certain PBDE congeners in salmon have raised concern regarding potential risks associated with dietary PBDE exposures. However, little is known regarding PBDE-mediated cell injury in relevant in vitro cell models. We conducted a comparative study of oxyradical production and cell injury in rainbow trout gill (RTgill-W1) and trout liver cells (RTL-W1) exposed to 2,2',4,4'-tetrabromodiphenyl ether (BDE 47), a predominant BDE residue found in fish tissues such as salmonids. Exposure to low micromolar concentrations of BDE 47 elicited a significant loss in RTgill-W1 and RTL-W1 cell viability as measured by alamarBlue assay. The dose-response of BDE toxicity differed among the two cell lines, with the RTL-W1 liver cells showing greater resistance to toxicity at lower BDE 47 doses, but a more dramatic loss of viability relative to gill cells when challenged with higher (50 microM) doses. The sensitivity of the trout liver cells at higher BDE 47 exposures was reflected by a higher basal production of oxygen radical production by 6-carboxy-2',7'-dichlorodihydrofluorescein diacetate (DCFH-DA) fluorescence that was markedly enhanced in the presence of BDE 47, suggesting an overwhelming of trout liver cell antioxidant defense pathways. Collectively, our data indicate that RTgill-W1 and RTL-W1 liver cells are sensitive to BDE 47-mediated cell injury through a mechanism that may involve oxidative stress. Our data also provide an in vitro basis for potential tissue differences in BDE 47-mediated cell injury.  相似文献   

应力场对北美东部板内地震的制约     

Zoba.  ML 高建理 《地壳构造与地壳应力》1993,(6):2-19

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放射性核素在非饱水裂隙介质中的迁移     

Wils.  ML 叶艳妹 《国外地质(成都)》1991,(4):19-24

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全球观测的岩石圈应力图象     

佐贝.  ML 刘杰 《地震科技情报》1994,(5):13-16

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A description of how metal pollution occurs in the Tinto-Odiel rias (Huelva-Spain) through the application of cluster analysis   总被引：3，自引：0，他引：3  

Grande JA  Borrego J  Morales JA  de la Torre ML 《Marine pollution bulletin》2003,46(4):475-480

In the last few decades, the study of space-time distribution and variations of heavy metals in estuaries has been extensively studied as an environmental indicator. In the case described here, the combination of acid water from mines, industrial effluents and sea water plays a determining role in the evolutionary process of the chemical makeup of the water in the estuary of the Tinto and Odiel Rivers, located in the southwest of the Iberian Peninsula.Based on the statistical treatment of the data from the analysis of the water samples from this system, which has been affected by processes of industrial and mining pollution, the 16 variables analyzed can be grouped into two large families. Each family presents high, positive Pearson r values that suggest common origins (fluvial or sea) for the pollutants present in the water analyzed and allow their subsequent contrast through cluster analysis.  相似文献   

岩石化学分析及粒度分析数据的计算机处理系统     

刘岫峰  冯永国 《矿物岩石》1980,(2)

岩石化学分析及岩石粒度分析数据的处理是岩石学和地质学(如矿产地质,工程与水文地质等)中一项最基本的工作,其特点是变量多,运算繁琐,岩石常规分析一般10～20个元素量,粒度分析一般500个测定值,运算步骤一般是数百乃至千步,而且判别、转移很多,人工计算(包括用电子计算器)耗时费力,占据大量重复性劳动,给生产、科学研究不能及时提供数据,致使大量原始资料积压乃至废弃。随着科学技术的发展,化学分析与粒度测量的时间已大大缩短,数据处理技术必须相应跟上,在这方面电子计算机这种现代化的计算手段给我们打开了快速数据处理的大门。  相似文献   

Mechanisms for the prevention of marine bioinvasions for better biosecurity     

Hewitt CL  Campbell ML 《Marine pollution bulletin》2007,55(7-9):395-401

Biosecurity management allows countries to meet a number of international obligations and provides some protection from potential degradation of environmental, economic, social and cultural values. Ocean governance relies on the precepts of ecologically sustainable development to manage the multiple uses in the coastal zone. The increasing reliance on aquaculture to provide food security and economic development has led to an increase in the use of non-native target species grown as food sources. Increased economic activity has led to shifting trade patterns and increased efficiencies in vessels with the resulting increase in the number of introduced marine species via ballast water and hull fouling. Herein we review the different marine biosecurity strategies and legislation that have been implemented internationally and locally that aid in preventing and managing introduced marine species, with some attention to Australia and New Zealand as examples. Typical tools being used include quarantine, Import Health Standards, voluntary cleaning guidelines, and risk assessment, all of which aim to prevent introductions.  相似文献