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In most previous work on the yellow dung fly Scathophaga stercoraria (L.), as on other species, adaptive explanations have been sought for male behaviour whereas female behaviour has not been examined in similar detail. Here, the arrival of females at the mating site, fresh cattle droppings, is investigated. While almost all males are present shortly after(More)
Real-time observations were made of the shape change from pyramids to domes during the growth of germanium-silicon islands on silicon (001). Small islands are pyramidal in shape, whereas larger islands are dome-shaped. During growth, the transition from pyramids to domes occurs through a series of asymmetric transition states with increasing numbers of(More)
Prostate cancer continues to be the most common cancer and second leading cause of cancer-related death among men. The use of markers, particularly serum-based prostate specific antigen (PSA), has contributed to the rapid rise in diagnosed cases in the late 1980s and early 1990s, but new diagnostic and possible therapeutic markers are needed and are(More)
Three-dimensional islanding is generally assumed to proceed through nucleation and growth. Here we present studies showing the growth of Si1-xGex islands (0.2<x<0.6) without nucleation. Rather, a strain-driven growth instability induces a network of elevated cells, where the angle of elevation self-limits when 105 facets form pyramidal islands. These(More)