منابع مشابه
Web wonders
‘without wings, without legs, without eyes, wallowing well pleased in the midst of a mass of excrement,’ as the author Henry Mayhew described. Flies carried bacterial gastroenteritic diseases and were the cause of significant infant mortality in the late nineteenth century in the absence of good sanitation. The prospect of invasion by the damaging Colorado potato beetle provided impetus for the...
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It has been suggested that the regionally restricted expression of Dlx genes acts to pattern the proximodistal axis of the pharyngeal arches during vertebrate development. Recently, clear evidence of this has emerged from Dlx-5; Dlx-6 double mutants, in which the lower jaw is transformed to an upper jaw.
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Starting from 2002, Wonders Information Co., Ltd., a medium-sized software company located in Shanghai, China, started building a knowledge management system that attempted to facilitate knowledge sharing between its employees. This teaching case describes how the system was conceptualized, designed, built, and used. In doing so, we wish to provide a context for in-depth discussion on designing...
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In the electromagnetic fields B = (ωt) −2 b(r/ωt), E = −r×B/(ct) the trajectories of non-relativistic charged particles conserve (r − vt) 2. The transformatioñ r = r/(ωt), τ = ω −2 t −1 maps such trajectories into orbits in the constant magnetic field˜B = −b(˜ r) all of which conserve˜v 2. ω is a constant. The transformation may also be used to transform any fields obeying curl E = −c −1 ∂B/∂t,...
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Proteins are vital parts of living organisms, as they are integral components of the physiological metabolic pathways of cells. Periodontal tissues comprise multicompartmental groups of interacting cells and matrices that provide continuous support, attachment, proprioception, and physical protection for the teeth. The proteome map, that is, complete catalogue of the matrix and cellular protein...
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ژورنال
عنوان ژورنال: Nature
سال: 1989
ISSN: 0028-0836,1476-4687
DOI: 10.1038/339349b0