By M. Levendowsky (Eds.)
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Extra resources for Biochemistry and Physiology of Protozoa
There are no obvious MTOCs at the poles, and the main part of the nuclear envelope remains Figure 14. The iiiterphase nucleus of Trachelomonas (Euglenophyceae) showing the large central nucleolus and condensed chromosomes. Magnification: x 28,000. Figure 15. Part of an anaphase nucleus of Amp hidinium carterae (Dinophyceae), showing cytoplasmic microtubules passing through a tunnel to the walls of which the small chromosomes are attached. Magnification: x32,000. (Courtesy of B. R. ) 46 John D. Dodge intact, giving what Taylor (1967a) has called semiopen division.
Chrysophycean cells exhibit a variety of cell coverings. Some, such as the silicoflagellates, are entirely naked, for here the silica spicule is situated within the cell (van Valkenburg, 1971). Ochromonas species are also naked, and the function of microtubules in cell support has been investigated in detail (Bouck and Brown, 1973). Many members of the group have silica scales which clothe the cell membrane. These are not formed in the Golgi body, as are scales of the Haptophyceae and Prasinophyceae, but in derivatives of the endoplasmic reticulum (Schnepf and Deichgräber, 1969).
In the majority of dinoflagellates the insertion is midventral (Peridiniales and Gymnodiniales), although it may also be lateral (Dinophysiales) or apical (Prorocentrales). To some extent the type of insertion varies with the type of flagella. Thus the pairs of 4t smooth" flagella (Figure 8) in the Chlorophyceae and Haptophyceae are anteriorly inserted and directed. The heterokont flagella of the Chrysophyceae and Chloromonadophyceae (plus the Phaeophyceae and Xanthophyceae) are anterior but with a tendency towards lateral for the smooth flagellum which beats posteriorly.
Biochemistry and Physiology of Protozoa by M. Levendowsky (Eds.)