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Rosa Bonetto E. del Castillo Julia Uranga 《Cellular and molecular life sciences : CMLS》1981,37(2):209-210
Summary Glomerulopressin acts on the lymphatic hearts of toads: increasing the passage of T-1824 from the abdominal lymphatic sac to the veins in normal animals, but not in toads treated with indomethacin. 相似文献
75.
Ardley Quarry in Oxfordshire, UK, contains one of the most extensive dinosaur-trackway sites in the world, with individual trackways extending for up to 180 metres. We have discovered a unique dual-gauge trackway from a bipedal theropod dinosaur from the Middle Jurassic in this locality, which indicates that these large theropods were able to run and that they used different hindlimb postures for walking and running. Our findings have implications for the biomechanics and evolution of theropod locomotion. 相似文献
76.
Rac function and regulation during Drosophila development 总被引:11,自引:0,他引:11
Hakeda-Suzuki S Ng J Tzu J Dietzl G Sun Y Harms M Nardine T Luo L Dickson BJ 《Nature》2002,416(6879):438-442
Rac GTPases regulate the actin cytoskeleton to control changes in cell shape. To date, the analysis of Rac function during development has relied heavily on the use of dominant mutant isoforms. Here, we use loss-of-function mutations to show that the three Drosophila Rac genes, Rac1, Rac2 and Mtl, have overlapping functions in the control of epithelial morphogenesis, myoblast fusion, and axon growth and guidance. They are not required for the establishment of planar cell polarity, as had been suggested on the basis of studies using dominant mutant isoforms. The guanine nucleotide exchange factor, Trio, is essential for Rac function in axon growth and guidance, but not for epithelial morphogenesis or myoblast fusion. Different Rac activators thus act in different developmental processes. The specific cellular response to Rac activation may be determined more by the upstream activator than the specific Rac protein involved. 相似文献
78.
Julia Fourman 《Cellular and molecular life sciences : CMLS》1970,26(3):293-294
Résumé En employant des techniques histochimiques nous avons étudié l'innervation adrénergique du rein des mammifères et démontré que les fibres adrénergiques entourent les artérioles et la partie supérieure des faisceaux des vasa recta. 相似文献
79.
Determining the architectures of macromolecular assemblies 总被引:1,自引:0,他引:1
Alber F Dokudovskaya S Veenhoff LM Zhang W Kipper J Devos D Suprapto A Karni-Schmidt O Williams R Chait BT Rout MP Sali A 《Nature》2007,450(7170):683-694
To understand the workings of a living cell, we need to know the architectures of its macromolecular assemblies. Here we show how proteomic data can be used to determine such structures. The process involves the collection of sufficient and diverse high-quality data, translation of these data into spatial restraints, and an optimization that uses the restraints to generate an ensemble of structures consistent with the data. Analysis of the ensemble produces a detailed architectural map of the assembly. We developed our approach on a challenging model system, the nuclear pore complex (NPC). The NPC acts as a dynamic barrier, controlling access to and from the nucleus, and in yeast is a 50 MDa assembly of 456 proteins. The resulting structure, presented in an accompanying paper, reveals the configuration of the proteins in the NPC, providing insights into its evolution and architectural principles. The present approach should be applicable to many other macromolecular assemblies. 相似文献
80.
Alber F Dokudovskaya S Veenhoff LM Zhang W Kipper J Devos D Suprapto A Karni-Schmidt O Williams R Chait BT Sali A Rout MP 《Nature》2007,450(7170):695-701
Nuclear pore complexes (NPCs) are proteinaceous assemblies of approximately 50 MDa that selectively transport cargoes across the nuclear envelope. To determine the molecular architecture of the yeast NPC, we collected a diverse set of biophysical and proteomic data, and developed a method for using these data to localize the NPC's 456 constituent proteins (see the accompanying paper). Our structure reveals that half of the NPC is made up of a core scaffold, which is structurally analogous to vesicle-coating complexes. This scaffold forms an interlaced network that coats the entire curved surface of the nuclear envelope membrane within which the NPC is embedded. The selective barrier for transport is formed by large numbers of proteins with disordered regions that line the inner face of the scaffold. The NPC consists of only a few structural modules that resemble each other in terms of the configuration of their homologous constituents, the most striking of these being a 16-fold repetition of 'columns'. These findings provide clues to the evolutionary origins of the NPC. 相似文献