Methane mass balance at three landfill sites: what is the efficiency of capture by gas collection systems?

Many developed countries have targeted landfill methane recovery among greenhouse gas mitigation strategies, since methane is the second most important greenhouse gas after carbon dioxide. Major questions remain with respect to actual methane production rates in field settings and the relative mass of methane that is recovered, emitted, oxidized by methanotrophic bacteria, laterally migrated, or temporarily stored within the landfill volume. This paper presents the results of extensive field campaigns at three landfill sites to elucidate the total methane balance and provide field measurements to quantify these pathways.

[Protein composition of the hemolymph of Biomphalaria glabrata (Mollusca, Gastropoda). Influence of the method of sampling and relation to the protein composition of different organs].

The blood composition of B. glabrata is analyzed by electrophoresis. Its proteic composition differs in relation with the blood sampling method.

[Hosts of Acanthocephala. II--Definitive hosts. 1. Fishes].

From an attentive study of the largest number of available publications, we tried to establish the list of fish species harbouring fully mature Acanthocephala, i.e. females with completely developed eggs.