Abstract
As early as 1893, Crato1 noticed highly refractive, colourless vesicles in the cells of brown algae. These vesicles, which are usually termed physodes, are characterized by a number of colour reactions, such as the red colour given with vanillin hydrochloric acid and diazo reagents. They are also known to reduce silver nitrate.
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References
Crato, E., Bot. Z., 51, 157 (1893).
Kylin, H., Hoppe-Seylers Z., 83, 171 (1913).
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LARSEN, B., HAUG, A. Chemical Composition of the Brown Alga Ascophyllum nodosum (L.) Le Jol.: Presence of Reducing Compounds in Ascophyllum nodosum. Nature 181, 1224 (1958). https://doi.org/10.1038/1811224a0
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DOI: https://doi.org/10.1038/1811224a0
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