Bull sperm extracted with 0.1% Triton X-100 can be reactivated to full motility with 0.33 mM Mg-ATP (sperm models). When motile sperm models are treated with 0.66 mM NiSO4, spontaneous motility is lost. During the transition to motility arrest, the beat becomes progressively more asymmetric, finally arresting at one extreme of the beat cycle. After spontaneous motility has been lost, the flagel...

High Resolution 3D Reconstructions of Rocks and Composites — Ten μm resolution 3D representations of different media, were obtained with a laboratory computer microtomograph developed from an electron microprobe column. From the original electron microprobe, only minor modifications have been required, indeed several of the utilities of the microprobe have been used to ensure high resolution ra...

Elsebeth Schröder, Roman Fasel, and Adam Kiejna Department of Applied Physics, Chalmers University of Technology and Göteborg University, SE-41296 Göteborg, Sweden Swiss Federal Laboratories for Materials Testing and Research (EMPA), nanotech@surfaces Laboratory, Feuerwerkerstrasse 39, CH-3602 Thun, Switzerland Institute of Experimental Physics, University of Wrocław, Plac M. Borna 9, PL-50-204...

Among the microanalytical techniques, electron probe microanalysis (EPMA) is one of the most powerful. Its performances can be used to provide an accurate characterization. In the present article the differences between the EPMA of highly irradiated materials and standard EPMA are highlighted. It focuses on the shielded EPMA specificities. Then, the article presents the difficulties encountered...