Morphogenesis and regeneration of oral structures in <i>Paramecium aurelia</i>: An analysis of intracellular development

Hanson, Earl D.

doi:10.1002/jez.1401500107

Cited by 58 publications

(23 citation statements)

References 13 publications

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“…Our observation that aged cells ingest fewer bacteria per food vacuole than young cells may result from: (a) gullet damage; i.e., irreparable gullet damage has been identified as a source of intraclonal variation (10,11,34); (b) reduced or inefficient ability to sweep bacteria into the gullet; or (c) loss of membrane recognition. The latter is consistent with the idea that cell membrane alterations may occur in aging cells (45).…”

Section: Smith-sonneborn and Rodermel Organelles And Agingmentioning

confidence: 88%

Loss of endocytic capacity in aging Paramecium. The importance of cytoplasmic organelles.

Smith-Sonneborn¹,

Rodermel²

1976

The Journal of Cell Biology

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Aged cells have significantly fewer food vacuoles and ingest fewer bacteria than young cells. Loss of food vacuoles was explained by a decreasing difference in the food vacuole formation and excretion rates; the formation rate declined more rapidly than the excretion rate, approaching equivalence at 160 fissions, when the proportion of cells with no food vacuoles, in the presence of excess food, abruptly increased. A model for cellular aging is presented in which control of organelle numbers and cyclical interactions between the nucleus and cytoplasm may be of critical importance.

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Section: Smith-sonneborn and Rodermel Organelles And Agingmentioning

confidence: 88%

Loss of endocytic capacity in aging Paramecium. The importance of cytoplasmic organelles.

Smith-Sonneborn¹,

Rodermel²

1976

The Journal of Cell Biology

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“…The experiments presented herein on 0. fallax doublets are analogous to those performed by Hanson (1962) on Paramecium doublets using a UV microbeam for gullet irradiation. More recent results on Paramecium (Hanson & Ungerleider, 1974) show that gullet-forming capacity can be maintained through a limited number of cell cycles even in the physical absence of the gullet.…”

Section: Discussionmentioning

confidence: 99%

Laser microbeam induction of incomplete doublets of Oxytricha fallax

Grimes

1976

Genet. Res.

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Destruction by laser microbeam of oral and ventral cirral primordia for the future opisthe of 1/2 of a pre-fission doublet results in the permanent loss of ability to form oral and ventral cirral primordia on the irradiated half. This observation provides further evidence for the postulated 'determinative region' present on each ventral surface of these organisms. The opisthe of the irradiated doublet retains both original rows of marginal cirri, which are located mid-dorsally with respect to the remaining ventral surface. These two rows of marginal cirri are reproduced faithfully in all future opisthes, but are lost in most proter lines. The pattern of loss in proters involves migration of the extra rows of marginal cirri to the cell's right margin followed by aberrant morphogenesis and subsequent resorption. These results show that the reproduction of marginal cirri is at least partially dependent upon the presence of marginal cirri and their inherent structural characteristics as well as upon their position on the cell surface.

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“…The organism used was P. tetraurelia (Sonneborn, 1975), stock 51, mating type VII, sensitive, maintained in Cerophyl medium innoculated with Aerobacter cloacae (Hanson, 1962). Cells were maintained and all experiments conducted at room temperature (25 °C).…”

Section: Methodsmentioning

confidence: 99%

Longitudinal microtubules and their functions during asexual reproduction inParamecium tetraurelia

Sundararaman

Hanson

1976

Genet. Res.

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Longitudinal microtubules appear in Paramecium tetraurelia when cells are ready to divide (ca. interfission age 0-9). They arise in the longitudinal cortical ridges between kineties and form, in each ridge, an incomplete circlet of 15-18 microtubules, disappearing 10-15 min after separation of the fission products (ca. interfission age 0-03-0-04). Vinblastine, colchicine, colcemid, mercaptoethanol, and cold treatments all result in loss of these microtubules, rounding up of the cells, and some suppression of cell division. The tubules are thought to play a role in cellular elongation, morphogenesis, and separation.

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Morphogenesis and regeneration of oral structures in Paramecium aurelia: An analysis of intracellular development

Cited by 58 publications

References 13 publications

Loss of endocytic capacity in aging Paramecium. The importance of cytoplasmic organelles.

Loss of endocytic capacity in aging Paramecium. The importance of cytoplasmic organelles.

Laser microbeam induction of incomplete doublets of Oxytricha fallax

Longitudinal microtubules and their functions during asexual reproduction inParamecium tetraurelia

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