Read The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint)

The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint)

Royal Dublin Society

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Description:Excerpt from The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series So that we may say that the total mechanical effect produced in dry seeds by immersing them in liquid hydrogen is very slight. In the case of moist seeds there is an entirely different series of events. Here the wet seed-coat is an efficient conductor of heat, and the cells of the seed contain a much larger percentage of water. Consequently, freezing of the tissues is only a question of temperature. At what temperature freezing Of the above mentioned seeds begins, I have not attempted to determine. Probably it varies with the species, and with the actual amount of water contained in the seed. That a plant-tissue may be frozen without being killed, seems fairly well established by experiment; and probably this holds good in the case of seeds also. That on still further lowering the temperature, a point is reached at which freezing to death occurs is equally certain from the foregoing experiments. The Older theory of freezing was that a formation of ice particles took place within the cell. The more modern theory is that as the temperature falls, con traction Of the protoplasm takes place, water passes out from the cell through the cell wall, and freezes outside the cell in the intercellular spaces. The cell-sap left behind in the cell will therefore be more concentrated, and will require a still lower temperature to freeze it. If the temperature falls further, more and more water will pass outside the cell and become frozen. On this theory, if freezing has not gone too far, and if the thawing be gradual, the ice in the intercellular spaces melts, and is absorbed by the cells again, no loss of vitality resulting. 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.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint). To get started finding The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
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Description: Excerpt from The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series So that we may say that the total mechanical effect produced in dry seeds by immersing them in liquid hydrogen is very slight. In the case of moist seeds there is an entirely different series of events. Here the wet seed-coat is an efficient conductor of heat, and the cells of the seed contain a much larger percentage of water. Consequently, freezing of the tissues is only a question of temperature. At what temperature freezing Of the above mentioned seeds begins, I have not attempted to determine. Probably it varies with the species, and with the actual amount of water contained in the seed. That a plant-tissue may be frozen without being killed, seems fairly well established by experiment; and probably this holds good in the case of seeds also. That on still further lowering the temperature, a point is reached at which freezing to death occurs is equally certain from the foregoing experiments. The Older theory of freezing was that a formation of ice particles took place within the cell. The more modern theory is that as the temperature falls, con traction Of the protoplasm takes place, water passes out from the cell through the cell wall, and freezes outside the cell in the intercellular spaces. The cell-sap left behind in the cell will therefore be more concentrated, and will require a still lower temperature to freeze it. If the temperature falls further, more and more water will pass outside the cell and become frozen. On this theory, if freezing has not gone too far, and if the thawing be gradual, the ice in the intercellular spaces melts, and is absorbed by the cells again, no loss of vitality resulting. 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.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint). To get started finding The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint)

The Scientific Proceedings of the Royal Dublin Society, Vol. 11: New Series (Classic Reprint)

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