A method to calculate the cumulative energy demand (CED) of lignite extraction

For the utilisation of an energy carrier such as lignite, the whole life cycle including necessary energy supply processes have to be considered. Therefore using the ‘Cumulative Energy Demand’ (CED) is especially suited to determine and compare the energy intensity of processes. The goal of the CED is to calculate the total primary energy input for the generation of a product, taking into account the pertinent front-end process chains. So the CED is in many steps similar to the LCA, especially in the ‘inventory analysis step’. The statements of the CED for energy supply-systems are concerned with the (primary) energy-efficiency of the energy supply and pointing out the life cycle steps with high energy-resources demand. Due to the great environmental impacts of energy supply and use which have to be laboriously assessed in LCA, the CED provides a useful, additional, energy-related ‘screening-indicator’ to LCA. This case study analyses the extraction of lignite in an opencast mine in West-Germany as the first step of energy carrier provision. Our data for the inventory analysis arise from a measuring campaign about the period of one year. The results underline the great energy demand of lignite extraction in West-Germany. With reference to the energy contents of lignite, the fraction of primary energy demands for its’ mining amounts to about 6.2%. This accounts to 93.8 % of the lignite energy content being available as usable energy for further processes, which is obviously worse than other studies have shown.     

Variants of Myxococcus virescens Exhibiting Dispersed Growth. Growth and Production of Extracellular Enzymes and Slime

The growth of two strains of Myxococcus virescens exhibiting dispersed growth was followed in casamino acids (N III-C) media and casitone media. The changes in optical density, pH, pigmentation as well as the secretion of bacteriolytic and proteolytic enzymes, DNA and polysaccharides during growth were recorded. In both media the bacteria grew exponentially with a generation time of 4 (casitone) and 20 hours (N III-C) respectively. The maximal cell mass was about 4 times higher in casitone than in casamino acids media. The amounts of bacteriolytic enzymes produced by the two strains in N III-C medium were different but in casitone medium they were about equal and considerably higher. The maximal values of proteolytic enzymes were about the same in both media and always occurred later than the bacteriolytic maxima. Both activity peaks appeared before the phase of decline. The polysaccharide production reached a maximum during the stationary growth phase in both media. A higher value was reached during growth in casitone medium than in N III-C medium. During the phase of decline a second increase of polysaccharide in the medium appeared. No DNA could be detected in the cell-free solutions until the beginning of the phase of decline.     

From the Waters of the Empire to the Tanks of Paris: The Creation and Early Years of the Aquarium Tropical,Palais de la Porte Dorée

From May to November 1931, the Exposition coloniale internationale was held in Paris. Publicized as a trip around the world in a single day, it was designed to stimulate investments and general enthusiasm for the colonies. Along with exotic temporary pavilions representing the various colonies, model villages inhabited by colonial natives, and pavilions representing commercial product brands and other colonial powers, the exposition included a zoo and an aquarium featuring animals from the colonies. Installing a large aquarium had been a costly and difficult process, and construction was plagued by many delays and problems. But when the aquarium finally opened a few months into the exposition, it quickly became a favorite of the public. With the double mission to provide a living synthesis of the products of the warm waters of the French empire and give visitors a sense of the diversity, beauty, and economic resources of their colonial possessions, the aquarium functioned as a panorama that presented a striking visual metaphor for the empire. This article follows the aquarium during the exposition and in the years that followed. We explore its place in the history of aquaria in general and pay particular attention to its role in the exposition and within the French colonial context of the 1930s and onward. Here, both the scientists in charge of the site and the aquatic animals living in its tanks and terrariums provide a window into the relationship of marine biology, public education, consumerism, and colonialism at mid-twentieth century.     

Electrospray ionization mass spectrometry of platinum anticancer agents.

Quantification and identification of platinum drugs and their metabolites in biological samples has always been difficult because these compounds are thermally unstable, non-volatile and insoluble. We have demonstrated that electrospray ionization mass spectrometry can be a valuable technique for direct mass spectral analysis of platinum anticancer agents and for obtaining structural information as a result of fragmentation. Full-scan spectra were obtained with approximately 10 pmol samples. These results show the potential of applying this technique in pharmacokinetic studies of platinum anticancer drugs.     

Parent Civic Beliefs,Civic Participation,Socialization Practices,and Child Civic Engagement

We examined civic engagement in middle childhood and the degree to which parents’ civic beliefs (i.e., social trust and civic efficacy), civic participation, and socialization practices were associated with indicators of children's civic engagement (i.e., social responsibility and civic values). Survey data were collected from 359 racially, ethnically, and economically diverse upper elementary students and their parents from six schools in Southern California. The results of path analyses indicated that higher levels of parent social trust were associated with higher levels of community responsibility and civic values in children. Additionally, parent social trust, civic efficacy, and civic participation were indirectly associated with children's community responsibility and civic values through children's perception of their parents as civic role models. Findings suggest that parents’ civic beliefs and civic participation are meaningful to children's civic engagement.