Quantification of outputs of antibacterial agents from fish farms is necessary to assess their environmental impact. In effluents, antibacterial agents are dissolved or associated with mineral or organic materials, the heaviest of which quickly settle at the exit of the fish farm. Oxolinic acid (OA) is one of the quinolones the most frequently used in turbot farms. For the first time, procedure...

Carbon nanotubes (CNTs) are often processed in suspended form and therefore a release of CNT-suspensions into the aquatic environment is plausible. In this study, the behaviour of two physico-chemically very different CNT types in the presence of varying, environmentally relevant calcium-containing media was investigated, including the long-term colloidal stability and the sedimentary structure...

Changes in landscape composition and productivity between 1991 and 1999 were examined over Southeastern Michigan. The pixel-wise changes were first summarized by 2000 Census block groups, which were grouped by settlement density. According to the areaweighted average, built-up area increased by 8.85%, forest increased by 13.73%, and agriculture decreased by 22.38%. During the same time period, ...

Na i D lines in the spectrum of the young binary KH 15D have been analyzed in detail. We find an excess absorption component that may be attributed to foreground interstellar absorption, and to gas possibly associated with the solids in the circumbinary disk. The derived column density is log NNa i = 12.5 cm−2, centered on a radial velocity that is consistent with the systemic velocity. Subtrac...

In this article we derive implications about social positions from a formal theory of social influence. The formal theory describes how, in a group of actors with heterogeneous initial opinions, a network of interpersonal influences enters into the formation of actors' settled opinions. We derive the following conclusions about a special form of structural equivalence. If actors are structurall...

Hydroides elegans is a major fouling organism in tropical waters around the world, including Pearl Harbor, Hawaii. To determine the importance of initial surface characteristics on biofilm community composition and subsequent colonization by larvae of H. elegans, the settlement and recruitment of larvae to biofilmed surfaces with six different initial surface wettabilities were tested in Pearl ...