Fine Structure and Morphogenesis in Protozoa

Observations on Atypical Mitochondria in Paramecium caudatum*

“…The mitochondria depicted in Figs. [1][2][3][4] represent some of the unusual configurations seen in the above cited cases. Figs structure of the microtubules generally shows no significant alteration except in those areas of the organelle which had been reduced to several strands, remnants of the outer limiting membranes (Figs.…”

“…A description of atypical mitochondria found in specimens of Paramecium caudatum, which had been treated with shocks of electric current, is reported. The morphological alterations of these organelles, noted only in certain percentages of specimens from several experimental groups, usually involved a three-to fivefold increase in diameter accompanied HE mitochondria of protozoa show a typical in-T ternal morphology considered somewhat different from that seen in other animal cells (3,6). Structural variations of these organelles in a given species or cell type are usually attributed to either artifacts of specimen preparation or subtle changes in cell states.…”

Some Aspects of the Protozoa and their Way of Life: The Sixth Marjory Stephenson Memorial Lecture

“…Those found most frequently in the protozoa comprise cilia, flagella, mitochondria, cytoplasmic membranes and plastids ; these are essentially, as recently emphasized by Grimstone, similar in their fine structure to those of higher plants and animals (Grimstone, 1961). In spite of the importance of all the organelles, the general functioning of the cell is ultimately dependent on the nucleus, which contains the chromosome complex and the all important DNA.…”

Ultrastructure of porcine trichomonads from culture

“…On the basis of the results obtained with T. suis and the reports of Kofoid and Swezy (1915), Grimstone (1961) and Mattern, Honigberg and Daniel (1967), a mechanism for organellogenesis of the axostyle can The Costa is also a fibrillar structure originating in the kinetosome region of the karyomastigont complex. Sections in which the costa is found also reveal subcostal granules.…”

“…Separation of the interlocked axostyles could be interpreted as a splitting of the parental axostyle when viewed by light microscopy. Grimstone (1961) stated that the kinetosomes act as organizers for the synthesis of fibrillar struc tures in the trichomonads. Mattern, Honigberg and Daniel (1967) con sidered the paraxostylar granules of T. gallinae to be the source of materials used in the formation and regeneration of the axostyle.…”