. Botany of the living plant. Botany; Plants. Fig. 82. Starch grains from the Potato. A. simple ; B, half compound ; C, D, compound grains. c, organic centre, or nucleus of formation. ( x 540.) (After Strasburger.). Fig. 83. Cell-wall of a single cell of the endo- sperm of Lodoicea, consisting of reserve cellulose which forms the thickened regions of the wall. ( x 400.) (After Gardiner.) known and most abundant, forming in many cases the chief non-nitrogenous reserve substance. This for example is the case in the seeds of the Castor-oil plant {Ricinus) and in various nuts,—Brazil, Walnut and H
. Botany of the living plant. Botany; Plants. Fig. 82. Starch grains from the Potato. A. simple ; B, half compound ; C, D, compound grains. c, organic centre, or nucleus of formation. ( x 540.) (After Strasburger.). Fig. 83. Cell-wall of a single cell of the endo- sperm of Lodoicea, consisting of reserve cellulose which forms the thickened regions of the wall. ( x 400.) (After Gardiner.) known and most abundant, forming in many cases the chief non-nitrogenous reserve substance. This for example is the case in the seeds of the Castor-oil plant {Ricinus) and in various nuts,—Brazil, Walnut and Hazel (see Appendix B). The fats exist in the form of globules in the cytoplasm : they contain the elements carbon, hydrogen and oxygen, and are organic salts produced by reaction between fatty acids and glycerine, a basic substance. There is no doubt that fats arise from sugars within the plant cell, though the steps in the transformation are obscure. It is believed that fatty acids and glycerine are separately formed from sugars, and the two then react together. During the germination of fatty seeds a reverse change occurs, the fats being re- converted into sugars. The well-known enzyme Lipase effects the formation of fats from fattv acids and glycerine, and under other conditions it promotes the reverse 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; Wardlaw, C. W. (Claude Wilson), 1901-. London, Macmillan and Co. , ltd.
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