Titlebook: Ultrasound in Medicine; Volume 1 Proceedings Denis White Conference proceedings 1975 American Institute of Ultrasound in Medicine and Plenu

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subscribers no later than four months after the meeting reported. It is hoped that such prompt publication will further enhance their value to those interested in the field of ultrasound in medicine and biology. The Editor gratefully acknowledges the assistance of his secre­ tary, Mrs. Joan Carson, upon whos978-1-4613-4445-2978-1-4613-4443-8

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Navin C. Nanda M.D.,Raymond Gramiak M.D.,James A. Manning M.D.omologous recombination or other mechanisms. There is already available evidence that site-specific recombination can increase the efficiency of genetic transformation, improve its reliability, and reduce the extent of modifications imposed on genomic DNA during the transformation process.

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Navin C. Nanda,Scott Stewart,Raymond Gramiak,James Manningloosely organized into three groups. Chapters 2-6 deal primarily with the biochemistry and molecular biology of nitrogen assimilation and transport, Chapters 7-978-1-4612-8106-1978-1-4613-0835-5Series ISSN 0079-9920 Series E-ISSN 2211-9094

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D. J. Sahn,Y. Vaucher,D. F. Williams,G. Leopold,W. F. Friedmansoils would appear within a period of only a few years. This is particularly true of potassium, which is found in the exchangeable form in relatively small amounts and is used by plants in relatively large amounts (Black 1957).

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