Chemical Investigations Of The Tobacco Plant 7 Chemical Changes In Light And In Darkness

Author : Hubert Bradford Vickery
Publisher : Forgotten Books
ISBN 13 : 9780428832155
Total Pages : 84 pages
Book Rating : 4.8/5 (321 download)

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Download or read book Chemical Investigations of the Tobacco Plant, Vol. 6 written by Hubert Bradford Vickery and published by Forgotten Books. This book was released on 2018-01-11 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Chemical Investigations of the Tobacco Plant, Vol. 6: Chemical Changes That Occur in Leaves During Culture in Light and Darkness The significance Of asparagine in plant physiology was scarcely discussed at this time. In 1844, however, a chance Observation by Menici, a pharmacist Of Pisa, led to a study of asparagine which at one stroke made many of the chemical and physiological relationships Of this substance clear. Menici had had occasion to sprout vetch seeds in the dark and, from an extract Of the etiolated seedlings, had prepared a small quantity Of a crystalline compound that he took to Piria at the University Of Pisa with a request for identification. Piria (48) suspected its nature at once and repeated Menici's experiment on a large scale. He showed that asparagine could be Obtained in equally large quantities from vetch seedlings whether these were sprouted in light or in the dark; that none of the substance was present in the unsprouted seeds; and that it disappeared from the tissues of the plants as these approached flowering, none at all being found as the fruit rip ened. Accordingly, he inferred that light has no influence on the for mation of the substance, that it is produced from the protein of the seed, and is utilized by the plant in the later stages of growth. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.