Summary
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1.
Light produces a greater intake of glycerine into erythrocytes, resulting in a quicker swelling and hemolysis of the latter than in the case when erythrocytes are kept in the dark.
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2.
Exposed to light, human erythrocytes absorb more glucose and increase more in volume (hematocrite) than when kept in the dark.
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3.
The factors of permeability for sodium chloride (cow erythrocytes) and for glucose (human erythrocytes) are always smaller in the dark than in light.
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4.
The facts described in 1, 2 and 3 show that the permeability of erythrocytes for water soluble substances is increased by light. As the permeability of erythrocytes is determined by that of their pellicle as well as by their protoplasm, and as the pellicle of erythrocytes represents a metabolized protoplasm, this result shows that, like other kinds of protoplasm, the protoplasm of erythocytes increases its permeability in light.
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Lepeschkin, W.W. The changes of the permeability of erythrocytes produced by light. Protoplasma 18, 243–259 (1933). https://doi.org/10.1007/BF01611892
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DOI: https://doi.org/10.1007/BF01611892