. Biological structure and function; proceedings. Biochemistry; Cytology. i^ f- m cw. '^12 Fu;. 12. This is identified as the external margin of an epidermal cell of the onion root tip. The nucleus is at A^, a nuclear envelope at ne. Organelles of the cytoplasm include mitochondria (ni), dictyosomes (d), proplastids (pp), and endoplasmic reticulum (er). The surface of the protoplast and its relation to the extracellular wall (nu) are the points of major interest. It appears that the wall has been put down in layers, reflecting, possibly, phases of wall formation. The surface of the protoplast
. Biological structure and function; proceedings. Biochemistry; Cytology. i^ f- m cw. '^12 Fu;. 12. This is identified as the external margin of an epidermal cell of the onion root tip. The nucleus is at A^, a nuclear envelope at ne. Organelles of the cytoplasm include mitochondria (ni), dictyosomes (d), proplastids (pp), and endoplasmic reticulum (er). The surface of the protoplast and its relation to the extracellular wall (nu) are the points of major interest. It appears that the wall has been put down in layers, reflecting, possibly, phases of wall formation. The surface of the protoplast in this instance shows no continuous plasma membrane but only short fragments. In places (arrow), the ends of ER elements project beyond the surface defined by these membrane fragments as though blending with the extra- cellular material. We interpret this image as descriptive of a process of wall formation in which a cortical layer of the cell, with fragments of the contained organelles, is externalized by the development of a new plasma membrane behind 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 IUB/IUBS International Symposium (1st : 1960 : Stockholm); International Union of Biochemistry; International Union of Biological Sciences; Goodwin, T. W. (Trevor Walworth); Lindberg, Olov, 1914-. London, New York, Academic Press
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Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectbiochemistry
