Characterisation of airborne particles collected within and proximal to an opencast coalmine: South Wales,U.K

Airborne particulate matter has been collected from within,and proximal to, an opencast coal mine in south Wales. Thiswork forms the first part of a three year project to collectand characterise, then determine the possible toxicology ofairborne particles in the south Wales region. High-resolutionField Emission SEM has shown that the coal mine dusts consistlargely of an assemblage of mineral grains and vehicle exhaustparticles. SEM-EDX has shown that the mineralogical make-up ofthe PM10 is complex, heterogeneous, and constantly changing.These findings are supported by analytical TEM-EPXMA.However, patterns can be determined relating the mineralogicalcomposition of the airborne particles to collection locationsand mining activities within the opencast. At our studyopencast, Park Slip West, quartz, which has known healtheffects, never exceeded 30% of the total collection mass, andaverage levels were much less. Vehicle exhaust emissions wasthe largest source in terms of particle numbers. The mass ofairborne particulate matter within the pit averagedapproximately twice that of outside the pit: importantlyhowever, this higher mass was due to relatively large, andnon-respirable, mineral grains. This study demonstrates that the physicochemical andmineralogical characterisation of airborne particles frommining and quarrying is essential to quantify the respirablefraction, and to identify potentially hazardous componentswithin the PM10.     

Federal project evaluation and intangible resources : The Tellico Dam

A model of resource evaluation incorporating reversibility of actions and substitutability for resource services is presented, along with associated decision criteria. The model extends and generalizes the Krutilla—Fisher procedure for evaluating unique resources. The more general technique is used to assess the official analysis of the Tellico Dam project in eastern Tennessee. In terms of measured values, the preservation option is shown to be superior to development only under extreme assumptions. The existence of substantial unmeasured preservation values in the Tellico case strengthens the environmentalist position, however, particularly since net benefits of development are apparently negative.     

Distribution of trace element pollutants in a contaminated ecosystem established on metalliferous fluorspar tailings. 3: fluoride

High total soil fluoride (10 000 microg g(-1)) in the metalliferous fluorspar tailings was reflected by elevated concentrations in standing live vegetation (300-1000 microg g(-1)); plant roots (c. 6000 microg g(-1)); plant litter (c. 4000 microg g(-1)); total body concentrations of invertebrates (400-4000 microg g(-1)) and the small mammals Microtus agrestis (120-360 microg g(-1)) and Sorex araneus (140-250 microg g(-1)). Seasonal changes in the standing live vegetation and the availability of soil fluoride to plants are discussed. Seasonal changes in total body concentrations of the small mammals were related to the age structure of the populations as well as dietary levels. In the small mammals, the concentration ratios were < 0.5 at the tailings dam and > 1.1 at the control site, indicating that both species were able to regulate fluoride accumulation at the higher levels of intake. Soft tissue concentrations were, as expected, very low compared to the hard tissues but, still, were generally significantly higher at the tailings dam compared to the control site. Evidence of dental fluorosis was found in Microtus agrestis, but not Sorex araneus.     

The arsenic content of bottled mineral waters

The arsenic levels of 23 mineral waters on sale to the public in the United Kingdom were measured. The arsenic content of most waters was below 1 g L^–1 but the statutory limits of 50 ug L^–1 for natural mineral waters and 100 g L^–1 for non-alcoholic beverages were exceeded by the French mineral water, Vichy Célestins (220 ug L^–1). Regular consumption of mineral water of such elevated concentration could make a significant contribution to the intake of the more toxic inorganic species of arsenic, with possible adverse long-term effects on the health of some individuals. The general need for analytical speciation studies of dietary arsenic is emphasised.     

Aggressive brood defense by females in the stomatopod Gonodactylus bredini

Summary Defense behavior by brooding Gonodactylus bredini females was studied in staged fights against conspecific challengers. Females brooding eggs were more successful at defending their dwelling cavities than were nonreproductive females. Females caring for larvae were no more successful at cavity defense than were controls.Brooding females do not defend cavities by using more aggressive acts or by engaging in longer fights than nonreproductive females. The increase in defense success seems to be due to a greater willingness to continue a contest after being struck by a challenger. Also, brooding females make more frequent use of threats, in particular the Meral Spread display, than controls.Females defend cavities as vigorously as if they still had eggs 4 or 5 days after their eggs have been removed. Within the first 24 h after oviposition, a female's success at defending a cavity is greatly reduced compared to that of a female just 1 day later.     

Predicting toxicity using computed molecular topologies: The example of triorganotin compounds

The LC50 values of eight triorganotin compounds for crab zoeae, $\text{Rhithropanopeus}$$\text{harrisii}$ correlate with substituent constants reflecting partitioning effects. Computed molar surface areas predict toxicity as well as any parameter used suggesting that partitioning into lipids controls the toxicity.     

Beyond the resource curse? Diamond mining,development and post-conflict reconstruction in Sierra Leone

In recent years, the so-called ‘resource curse’ syndrome has gained increasing currency. Growing evidence suggests that many African countries with significant natural wealth have actually reaped limited rewards, instead experiencing underdevelopment, corruption, political instability, and in some cases, violent conflict. In the small West African state of Sierra Leone, it has been suggested that diamonds played a key role in fuelling a brutal civil war during the 1990s, an issue that has given rise to a burgeoning literature on ‘blood diamonds’. However, as Sierra Leone emerges from a decade of destruction, other research suggests that diamonds could actually provide the impetus for post-war reconstruction. This paper explores the role of alluvial diamond mining in post-conflict Sierra Leone, focusing on two communities in the Eastern Province that were badly affected by the war. Drawing on field-based research conducted between 2002 and 2007, the paper considers the diamond mining situation in the context of broader development strategies in post-conflict reconstruction. It is argued that sustainable development can only be achieved if future policies are based on a detailed understanding of relationships between diamond mining and rural development at local, regional and national levels.