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The macronucleus is the largest organelle in the P.
multimicronucleatum cell and can measure 35µm long by 12µm wide. A
small fraction of a macronucleus is seen in this micrograph. The
chromatin appears as thousands of small electron opaque foci scattered
throughout a moderately stained nucleoplasm. In addition this nucleus
contains numerous larger electron-opaque nucleoli (no)
scattered equally through the nucleoplasm. Nucleoli are sites of
ribosome subunit synthesis. This cell was in day 1 of the culture age
study and the cell had large regions of rough ER that were covered
with large numbers of ribosomes. There were many folds in the
macronuclear surface. The nuclear envelope is packed with nuclear
pores (nep). EM taken on 5/29/78 by R. Allen with Hitachi HU11A
TEM. Neg. 10,000X. Bar = 0.5µm.
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