Abstract
When living plant protoplasm is observed with a microscope, the protoplasmic inclusions—nuclei, plastids, mitochondria, ergastic droplets, and other smaller particles ranging down to the limits of light microscopy—often can be seen in active cyclosis. The sluggish manner in which the inclusimis change their position as the protoplasm courses around the cell suggests that they are being carried along by a somewhat viscous matrix, which appears visibly different from the vacuole. The hyaline character of the matrix also suggests that it is homogeneous. However, this impression of homogeneity disappears when the matrix is examined with the ultramicroscope, for some particles measuring about 0.1 micron and others barely detectable by this instrument, that is, about 50 to 100 Å in diameter, have been discerned (Gaidukov 1906). Aside from the nucleus, the non-vacuolar portion of the protoplasm is the cytoplasm of the cytologist.
Fellow of the American Cancer Society, 1953–1954, as recommended by the Committee on Growth of the National Research Council.
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Wildman, S.G., Cohen, M., Seifriz, W., Steffen, K. (1955). Das Cytoplasma. In: Ullrich, H., Bogen, H.J. (eds) Genetische Grundlagen Physiologischer Vorgänge · Konstitution der Pflanzenzelle / Genetic Control of Physiological Processes · The Constitution of the Plant Cell. Handbuch der Pflanzenphysiologie / Encyclopedia of Plant Physiology, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-94653-0_8
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