Abstract
IN recent papers (1933–37), Lundegårdh1 has demonstrated in the roots of plants a mechanism for absorbing and concentrating salts out of very dilute solutions. This mechanism utilizes energy derived from the oxidation of sugar and acts by transport of anions (in Lundegårdh's experiments, NO3 and Cl) from the outside medium through the active cells to the inside. It is a specially important point that the energy used up is proportional to the anion exchange, while cations cause no increase in respiration. In carbonate solutions no active transport can take place and the exchanges of cations are slight only.
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References
Lundegårdh, u. Burstrøm, Biochem. Z., 261, 235; 277, 223. Lundegårdh, Biochem. Z., 290, 104 (1933–37).
Koch, H., Amer. Soc. Sci. Bruxelles, 54, 346 (1934).
Krogh, A., Skand. Arch. Physiol., 76, 60 (1937).
Keys, A., Z. vergl. Physiol., 15, 364 (1931).
Ingraham and Visscher, Amer. J. Physiol., 114, 676 (1936).
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KROGH, A. Active Absorption of Anions in the Animal Kingdom. Nature 139, 755 (1937). https://doi.org/10.1038/139755a0
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DOI: https://doi.org/10.1038/139755a0
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