Results 291 to 300 of about 4,624,942 (322)
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Evolution of the lymphoid system
Cellular Immunology, 1976Abstract Leukocytes from the various lymphoid tissues of rainbow trout (RBT) were tested for their capacity to respond to the lymphocyte mitogens concanavalin A (Con A), lipopolysaccharide (LPS), and purified protein derivative of tuberculin (PPD). Thymocytes responded to Con A but not to LPS or PPD. In contrast, leukocytes from anterior
Howard M Etlinger +2 more
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The evolution of interorganizational systems
Journal of Information Technology, 1991In the literature on interorganizational systems (IOS) one encounters mainly examples of information systems that support highly structured transactions between organizations. However, the range of interorganizational activities also includes less structured interactions, such as negotiations and joint problem solving.
Johannes Meier, Ralph H. Sprague
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Annual Review of Neuroscience, 1991
Evolution is the unifying theme of biological thought. It is therefore surprising that until recently it has little shaped the ideas of those who have sought principles among the cells and circuits of nervous systems. After relegation to an historic approach for many decades, an evolutionary perspective in neuroscience has revived, armed now with ...
E A, Arbas +2 more
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Evolution is the unifying theme of biological thought. It is therefore surprising that until recently it has little shaped the ideas of those who have sought principles among the cells and circuits of nervous systems. After relegation to an historic approach for many decades, an evolutionary perspective in neuroscience has revived, armed now with ...
E A, Arbas +2 more
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The Evolution of the PAPRICA System
Integrated Computer-Aided Engineering, 1997PAPRICA project started in 1988 as an experimental VLSI architecture devoted to the efficient computation of data with two-dimensional structure. The main goal of the project is to develop a subsystem that could operate as an attached processing unit to a standard workstation and in perspective as a specialized processing module in dedicated systems ...
A. BROGGI +4 more
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Evolution of the complement system
Immunology Today, 1991The ancestral form of the alternative pathway of complement activation probably originated as a primitive independent immune system. Subsequent evolution of an adaptive immune response drove the specialization of the classical pathway to connect antibody-mediated nonself recognition to the complement-dependent effector mechanisms.
T C, Farries, J P, Atkinson
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The Evolution of Semantic Systems
Annals of the New York Academy of Sciences, 2004Abstract: Semantic or cultural systems are sets of concepts connected by meaningful relationships, and they exhibit properties similar to those of populations of biological organisms. Drawing upon ideas from evolutionary biology and methods from information technology, this article explores the potential for research and engineering on the evolution ...
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Evolution of mycorrhiza systems
Naturwissenschaften, 2000Most terrestrial plants live in mutualistic symbiosis with root-infecting mycorrhizal fungi. Fossil records and molecular clock dating suggest that all extant land plants have arisen from an ancestral arbuscular mycorrhizal condition. Arbuscular mycorrhizas evolved concurrently with the first colonisation of land by plants some 450-500 million years ...
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2012
Animals and plants have a complex and effective immune system that protect them from invading microorganisms. The mechanisms of immunity are evolutionarily selected throughout host-pathogen interaction to be tolerant to self-antigens and to recognize nonself molecular patterns. Plants and animals share a germ line encoded diversity of receptors capable
Ramón M, Rodríguez +2 more
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Animals and plants have a complex and effective immune system that protect them from invading microorganisms. The mechanisms of immunity are evolutionarily selected throughout host-pathogen interaction to be tolerant to self-antigens and to recognize nonself molecular patterns. Plants and animals share a germ line encoded diversity of receptors capable
Ramón M, Rodríguez +2 more
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The evolution of an immune system
Medical Hypotheses, 1979A model for the molecular evolution of an imune system is presented. It suggests how a system of cell surface-fixed antigen receptors, called FR, to be thought of as "primitive" but still functional antibodies, could evolve into the "modern" labile T cell and antibody system, the receptors for which may be called CER (clonal expansion receptors ...
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The evolution of the CEREC system
The Journal of the American Dental Association, 2006Early in 1980, the author anticipated the attraction of restoring posterior teeth with tooth-colored material. He conducted studies and developed the clinical concept of bonded ceramic inlays, at the same time raising the issue of the fast fabrication of the ceramic restorations.
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