. Cytology. Cytology. various elements of the endoplasmic reticulum have been interpreted as indicating either that the nuclear envelope is a modification of the cyto- plasmic membrane system or that certain membrane components of the. Figure 4-5. Electron Micrograph of Portion of a Meristematic Rootcap Cell of Maize, Showing a Double-layered Nuclear Envelope with Distinct Pores. Note continuity of the outer membrane of the nuclear envelope with double membrane element of the endoplasmic reticulum. Mitochondria, a Golgi apparatus (lower left in figure), and unidentified cytoplasmic inclusions
. Cytology. Cytology. various elements of the endoplasmic reticulum have been interpreted as indicating either that the nuclear envelope is a modification of the cyto- plasmic membrane system or that certain membrane components of the. Figure 4-5. Electron Micrograph of Portion of a Meristematic Rootcap Cell of Maize, Showing a Double-layered Nuclear Envelope with Distinct Pores. Note continuity of the outer membrane of the nuclear envelope with double membrane element of the endoplasmic reticulum. Mitochondria, a Golgi apparatus (lower left in figure), and unidentified cytoplasmic inclusions are shown. (From Whaley. W. G., Mollenhauer. H. and Leech, J. H., I960. â 'The Ultrastructure of the Meristematic ; Am. J. Botany, 47, Fig. 3, p. 425. Courtesy of Dr. W. Gordon Whaley. University of Texas.) cytoplasm are of nuclear origin. The observations made on the ultra- structure of the nuclear envelope indicate a complex structural organiza- tion which may correspond to regions of different permeable properties. 78 / CHAPTER 4. 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 Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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