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31.
E.A. Smith 《Journal of The Franklin Institute》1935,219(5):597-602
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We report a new Cretaceous multituberculate mammal with 3D auditory bones preserved. Along with other fossil and extant mammals, the unequivocal auditory bones display features potentially representing ancestral phenotypes of the mammalian middle ear. These phenotypes show that the ectotympanic and the malleus-incus complex changed notably during their retreating from the dentary at various evolutionary stages and suggest convergent evolution of some features to extant mammals. In contrast, the incudomalleolar joint was conservative in having a braced hinge configuration, which narrows the morphological gap between the quadroarticular jaw joint of non-mammalian cynodonts and the incudomalleolar articulations of extant mammals. The saddle-shaped and abutting malleus-incus complexes in therians and monotremes, respectively, could have evolved from the braced hinge joint independently. The evolutionary changes recorded in the Mesozoic mammals are largely consistent with the middle ear morphogenesis during the ontogeny of extant mammals, supporting the relation between evolution and development. 相似文献
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The governance of sustainable socio-technical transitions 总被引:8,自引:2,他引:8
A quasi-evolutionary model of socio-technical transitions is described in which regimes face selection pressures continuously. Differentiated transition contexts determine the form and direction of regime change in response to these pressures. The articulation of pressures, and the degree to which responses are coordinated and based on resources available within the regime, define the transition context. Four alternative contexts are described: endogenous renewal; re-orientation of trajectories; emergent transformation and purposive transitions. Agency and power in the governance of regime transformation are analysed. Power to affect change depends on regime membership, the distribution of resources for change and expectations. 相似文献
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The paper argues that in recent years sociologists have neglected the processes of occupational socialisation of leaching, despite research interest in everyday life in other educational settings. Shortcomings in the extant research on teacher socialisation and in the wider literature on professional socialisation are detailed to explain the lack of intellectual interest in teacher socialisation. Finally, the paper offers some potential lines for the development of research on teacher socialisation.
Just as we need to know more about how children are transformed into pupils, so must we know more about how young persons (usually college students) are transformed into teachers
(Wax & Wax, 1971, pp. 10‐11)