Plant Physiology Authorized English Translation By R J Harveygibson Suppleme
Plant Physiology Authorized English Translation By R J Harveygibson Suppleme
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When this point is exceeded the mercury acts just like a plasmolysing solution. At the same moment any further absorption of water on the part of the cell comes to an end, the water passes backwards into the vessel, and the ascent of the mercury ceases.
Such considerations as these compel us to conclude that continuous water columns in the vessels appear unequal to the task of raising water easily, since they are unable to overcome the great cohesion existing between the particles of water. In ...proportion as the columns become longer the absorption of water by the leaf-cells becomes more difficult, and must, in the long run, become quite impossible. We are further, for many reasons, unable to calculate how long the water columns may actually be. In the first place, we are ignorant as to whether very lofty trees may not perhaps possess an especially high osmotic pressure in their leaves (and in this relation it must be remembered that Dixon's (1896) determinations of osmotic pressures in the leaf are by no means above criticism), and in the second place, the power of suction possessed by the water column depends not only on its length but also on the friction which it meets with, owing to the tendency to collapse on the part of the walls of the vessels, as well as on the opposition to its passage through the living cells of the root.
What to read after Plant Physiology Authorized English Translation By R J Harveygibson Suppleme?
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To quickly assess the difficulty of the text, read a short excerpt:
When this point is exceeded the mercury acts just like a plasmolysing solution. At the same moment any further absorption of water on the part of the cell comes to an end, the water passes backwards into the vessel, and the ascent of the mercury ceases.
Such considerations as these compel us to conclude that continuous water columns in the vessels appear unequal to the task of raising water easily, since they are unable to overcome the great cohesion existing between the particles of water. In ...proportion as the columns become longer the absorption of water by the leaf-cells becomes more difficult, and must, in the long run, become quite impossible. We are further, for many reasons, unable to calculate how long the water columns may actually be. In the first place, we are ignorant as to whether very lofty trees may not perhaps possess an especially high osmotic pressure in their leaves (and in this relation it must be remembered that Dixon's (1896) determinations of osmotic pressures in the leaf are by no means above criticism), and in the second place, the power of suction possessed by the water column depends not only on its length but also on the friction which it meets with, owing to the tendency to collapse on the part of the walls of the vessels, as well as on the opposition to its passage through the living cells of the root.
What to read after Plant Physiology Authorized English Translation By R J Harveygibson Suppleme?
You can find similar books in the "Read Also" column, or choose other free books by Zed20english20translation20by20r20j20harve to read onlineMoreLess
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