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No part of the Hertzsprung-Russell diagram shows a more pronounced diversity of stellar types than the upper part, which contains the most luminous stars. Can one visualize a larger difference than between a luminous, young and extremely hot Of star, and a cool, evolved pulsating giant of the Mira type, or an S-type supergiant, or - again at the other side of the diagram - the compact nucleus of a planetary nebula? But there is order and unity in this apparent disorder! Virtually all types of bright stars are evolutionally related, in one way or the other. Evolution links bright stars. In many cases the evolution is speeded up by, or at least intimately related to various signs of stellar instability. Bright stars lose mass, either continuously or in dramatic sudden events, they vibrate or pulsate - and with these tenuous, gigantic objects this often happens in a most bizarre fashion. Sometimes the evolution goes so fast that fundamental changes are observable in the time span of a human's life - several of such cases have now been identified.
Now in its second year, Progress in Cell Cycle Research was conceived to serve as an up to date introduction to various aspects of the cell division cycle. Although an annual review in any field of scientific investigation can never be as current as desired, especially in the cell cycle field, we hope that this volume will be helpful to students, to recent graduates considering a de1liation in subject and to investigators at the fringe of the cell cycle field wishing to bridge frontiers. An instructive approach to many subjects in biology is often to make comparisons between evolutionary distant organisms. If one is willing to accept that yeast represent a model primitive eukaryote, then it ...
This valuable resource provides a systematic account of the biochemistry of smooth muscle contraction. As a comprehensive guide to this rapidly growing area of research, it covers the structure and characteristic properties of contractile and regulatory proteins, with special emphasis on their predicted function in the live muscle. Also included in this book are intermediate filament proteins, and desmin and vimentin, whose function in smooth muscle is unknown; and several enzymes involved in the phosphorylation-dephosphorylation of contractile and other proteins.
pt. 1. List of patentees.--pt. 2. Index to subjects of inventions.
This book considers the work of the preeminent scholar on decoloniality, Sabelo Ndlovu-Gatsheni, as a means of examining the development of decoloniality discourse and considering the future direction of the African knowledge economy. Sabelo Ndlovu-Gatsheni has been instrumental in the construction of theories and ideas necessary for advancing a decolonial system of education and epistemology. This book considers how Professor Ndlovu-Gatsheni’s work has helped to shape our thinking both on Mugabe and the history of Zimbabwe, and beyond to the broader questions of race, liberation, higher education, and the future of decolonial studies. Renowned author Professor Toyin Falola then invites us to consider the dangers of continued repression of African epistemologies, and the enormous benefits of an alternative knowledge economy in which a diverse multiplicity of ideas drives our understanding of the world on to new heights. Unpacking the various conceptual leanings of decoloniality through the works of one of its leading lights, this book will be an essential read for researchers across the fields of African Studies, Race Studies, Philosophy, and Education.
Reprint from Pure and Applied Geophysics (PAGEOPH), Volume 146 (1996), No. 3/4
Vitamins and Hormones