. Botany of the living plant. Botany. > }^^. Fig. 81. A-E, Leukoplasts from tuber of Phajus), showing various stages of development of starch grains. 1-4, Various stages of the corrosion of starch-grains in germinating Barley. (After Strasburger.) would obviously be impossible for the solid grain. The change happens quickly in the case of the grains included in the chloroplasts. and a few hours in the dark suffices for their re-solution. The details of the change are best observed in the large storage-grains such as those of the Barley. It is found to depend upon the action of Diastase, an
. Botany of the living plant. Botany. > }^^. Fig. 81. A-E, Leukoplasts from tuber of Phajus), showing various stages of development of starch grains. 1-4, Various stages of the corrosion of starch-grains in germinating Barley. (After Strasburger.) would obviously be impossible for the solid grain. The change happens quickly in the case of the grains included in the chloroplasts. and a few hours in the dark suffices for their re-solution. The details of the change are best observed in the large storage-grains such as those of the Barley. It is found to depend upon the action of Diastase, an enzyme or ferment widely distributed in plant-tissues where starch is present, and is being used up : as in germinating grains. This sub- stance can be extracted from tissues that contain it, by glycerine, and precipitated from the solution by alcohol. If the precipitate be collected and re-dissolved in water, a solution is obtained which still keeps its properties ; but these are destroyed on exposure to a tempera- ture of 75° C. By its reactions diastase is shown to have much in common with proteids. If a solution of diastase be added to starch-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
