Results 241 to 250 of about 5,782,691 (288)

Chromatographic Separation of Natural Compounds

Nature, 1949
THE isolation of more abundant natural compounds mostly uses very simple means—extraction, distiltion, crystallization—and combinations and refinements of these methods. The problem of isolatiing, less abundant natural substances is associated with two outstanding difficulties.
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Natural Product and Material Chemistries—Separated Forever?

Journal of the American Chemical Society, 2013
Chemistry research is an eloquent, yet extremely complex discipline consisting of a diverse range of topics. The complexity of every sub-discipline requires extensive focus, which can limit cross-talk between fields, thus leading to their isolation. In particular, natural product and material chemistries have experienced this trend, and it has led to ...
Kunz, H., Müllen, K.
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Separation of Natural Products by Countercurrent Chromatography

2012
Countercurrent Chromatography (CCC) provides the natural product chemist with a high-resolution separatory method, which is uniquely applicable to sensitive (unstable) compounds and which allows virtually quantitative recovery of the load sample. Different instruments use different means of retaining a stationary liquid phase.
James B, McAlpine, J Brent, Friesen, Guido F, Pauli   +2 more
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Separating Nature from the World

2013
In this final part I will turn my attention to developing a theory of nature using the methods of non-philosophy in the form I have given it in this work, that is, as a unified theory of philosophical theology and ecology. This theory of nature will be pursued and developed by way of philosophical and theological material “under-determined” by the ...
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Bayesian image separation with natural image prior

2012 19th IEEE International Conference on Image Processing, 2012
Image separation from a set of observed mixtures has important applications in many fields such as intrinsic image extraction. We investigate in this work a natural image prior based image separation algorithm. The natural image prior is modeled via a high-order Markov Random Field (MRF) and is integrated into a Bayesian framework for estimating all ...
Haichao Zhang 0001, Yanning Zhang 0001
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THE REAL NATURE OF AN ECOLOGY OF SEPARATION

2018
Neyrat begins to lay out his proposal for an ecology of separation that does not simply embrace the positions of deep ecology or of eco-constructivism whereby everything is interconnected. Neyrat proposes to provide an alternative ecology that would allow for the necessary distance within the interconnectedness of things so as to exit the failure of ...
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A New Robust Model for Natural Separation Efficiency

SPE Production and Operations Symposium, 2003
Abstract This paper presents a mechanistic model to predict natural separation efficiency. Based on drift-flux model, a new mathematical formulation was developed to estimate natural separation efficiency. The new model considers the existence of the slip velocity not only in the vertical direction, but also in the radial direction.
R.A. Marquez, M.G. Prado
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Separation procedures for naturally occurring antioxidant phytochemicals

Journal of Chromatography B, 2004
Phytochemicals in fruits, vegetables, spices and traditional herbal medicinal plants have been found to play protective roles against many human chronic diseases including cancer and cardiovascular diseases (CVD). These diseases are associated with oxidative stresses caused by excess free radicals and other reactive oxygen species.
Rong, Tsao, Zeyuan, Deng
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On the Composite Nature of the Extent of Separation

Separation Science, 1977
Abstract The fundamental expression for Rony's extent of separation in a 2-component system has been reexamined for any separation stage with respect to its relation with the traditional stage separation factor for a wide variety of separation processes.
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The Nature of Separable and Inseparable Prefixes

Die Unterrichtspraxis / Teaching German, 1973
struction in the Sixties, Genesee Valley Chapter, National Society for Programmed Instruction. Rochester: Univ. of Rochester, 1967. Protokoll eines Werkstattgesprachs Ober Moglichkeiten der Programmierten Instruktion im Fremdsprachenunterricht 10. und. 11. Dez. 1969 in Mbnchen. Miunchen: Goethe Institut, Arbeitsstelle for wissenschaftliche Didaktik, in
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