Transsaccadic integration of biological motion.

In a transsaccadic integration paradigm, Ss had to detect saccade-contingent changes in a moving point-light walker. First, the nature of the object representation surviving a saccade was examined. The low detection of changes in the image-plane position of the figure and the high detection of changes in the upright walker's in-depth orientation indicated that transsaccadic object representations are position invariant but orientation dependent. Implications for object recognition are highlighted. The second issue concerned transsaccadic anticipation of the future event course. Ss anticipated the postsaccadic relative positions of the walker's body parts. In contrast, there was no anticipation of the postsaccadic absolute position of a translating figure; instead, Ss relied on memory of the figure's presaccadic position. The anticipated in-depth orientation of a rotating walker seemed to be distorted in the direction of canonical views.

Nitrous oxide emissions from waste water.

The estimation of nitrous oxide emissions is complicated by the high degree of uncertainty on the emission factors involved and by the limited acquaintance with all significant nitrous oxide sources. A potentially important source for which emission data are lacking is the sewage system transporting waste water from human activities. For this study an experimental measurement campaign has been carried out on waste water sampled at different sewage treatment plants. The nitrous oxide developing from the water samples was monitored by means of gas chromatography. The methodological analysis was based on the concentration/time curves obtained. Our results indicate that the formation of nitrous oxide from the waste water matrices results from microbiological denitrification. We deduced tentative emission factors for the waste water types studied.