On the last years, gallium nitride (GaN) technology has made a remarked breakthrough in the world of microwave electronics. Power transistors are now available. How this GaN technology would impact space-borne units is now a priority concern. Although the power capability of GaN technology is the first obvious profit, GaN could also be used for other applications like low noise amplifiers, mixers, and probably more. The high sustainable temperature of GaN transistors is most striking advantage for in-flight use. This is connected to packaging design which is also experiencing a lot of activities and quick progresses. Of course, space application is dependent upon the full demonstration of reliability and this constitutes another field of investigation. Finally, after 8 years of GaN studies, experimental results are presented: they open wide the road a revolution inside space-borne electronics: the rise of GaN.

Summary Chromosome numbers were counted in root tip cells of 6 cyperaceous species growing in wetlands in the Mekong Delta, Vietnam. The results were as follows: Cyperus haspan, 2nϭ26; Eleocharis dulcis, 2nϭca. 212; Eleocharis spiralis, 2nϭ42; Fimbristylis ferruginea, 2nϭ20; Fimbristylis polytrichoides, 2nϭ10; Lepironia articulata, 2nϭ34. They were reported here for the first time using plant materials from Vietnam. Furthermore, the results of 2 species, Eleocharis spiralis and Lepironia articulata, were the first to be reported for these species. In addition, the dimorphism of Eleocharis dulcis shoots representing emerged and submerged culms was recorded.