Rosette Colonies of Choanoflagellates ( Salpingoeca rosetta ) Show Increased Food Vacuole Formation Compared with Single Swimming Cells

2020 ◽  
Vol 67 (2) ◽  
pp. 263-267 ◽  
Author(s):  
Nathan J. L'Etoile ◽  
Christina King‐Smith
Keyword(s):  
Food Vacuole ◽  
Vacuole Formation ◽  
Salpingoeca Rosetta

Cytochalasin B: Aspects of Phagocytosis in Nutrient Uptake in Tetrahymena

1974 ◽  
Vol 15 (2) ◽  
pp. 403-406
Author(s):  
ELSE K. HOFFMANN ◽  
L. RASMUSSEN ◽  
E. ZEUTHEN
Keyword(s):  
Nutrient Uptake ◽  
Nutrient Medium ◽  
Cytochalasin B ◽  
Tetrahymena Pyriformis ◽  
Food Vacuole ◽  
Vacuole Formation ◽  
Proteose Peptone ◽  
High Concentrations

Cytochalasin B (37 µg per ml) reduces the rate of food vacuole formation, i.e. the rate of phagocytosis, in Tetrahymena pyriformis. Cytochalasin B in this concentration suppresses multiplication rates in a nutrient medium consisting of 2 % proteose peptone, but multiplication is unaffected if this medium is supplemented with glucose and high concentrations of nucleosides. Thus nutrients in high concentrations circumvent the necessity for phagocytosis in Tetrahymena.

Mutants of Tetrahymena thermophila with temperature sensitive food vacuole formation

1979 ◽  
Vol 124 (2) ◽  
pp. 317-327 ◽  
Author(s):  
Peter B. Suhr-Jessen ◽  
Eduardo Orias
Keyword(s):  
Tetrahymena Thermophila ◽  
Food Vacuole ◽  
Temperature Sensitive ◽  
Vacuole Formation

The Effect of Temperature on Food-Vacuole Formation in Paramecium

1942 ◽  
Vol 15 (4) ◽  
pp. 453-458 ◽  
Author(s):  
J. Warren Lee
Keyword(s):  
Food Vacuole ◽  
Effect Of Temperature ◽  
Vacuole Formation

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

1976 ◽  
Vol 71 (2) ◽  
pp. 575-588 ◽  
Author(s):  
J Smith-Sonneborn ◽  
S R Rodermel
Keyword(s):  
Excretion Rate ◽  
Formation Rate ◽  
Food Vacuole ◽  
Cellular Aging ◽  
Critical Importance ◽  
Vacuole Formation ◽  
Cytoplasmic Organelles ◽  
Food Vacuoles ◽  
Excretion Rates

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.

Sustained Food Vacuole Formation by AxenicParamecium tetraureliaand the Inhibition of Membrane Recycling by Alcian Blue

1992 ◽  
Vol 39 (6) ◽  
pp. 713-718 ◽  
Author(s):  
EDNA S. KANESHIRO ◽  
STEVEN F. REUTER ◽  
FRANK J. QUATTRONE ◽  
RANDAL E. MORRIS
Keyword(s):  
Alcian Blue ◽  
Food Vacuole ◽  
Membrane Recycling ◽  
Vacuole Formation

On the role of food vacuole formation in the uptake of dissolved nutrients by Tetrahymena

1973 ◽  
Vol 82 (1) ◽  
pp. 192-196 ◽  
Author(s):  
L. Rasmussen
Keyword(s):  
Food Vacuole ◽  
Dissolved Nutrients ◽  
Vacuole Formation

The Effect of the H-Ion Concentration on Protozoa, as Demonstrated by the Rate of Food Vacuole Formation in Colpidium

1931 ◽  
Vol 8 (1) ◽  
pp. 17-29
Author(s):  
SYLVIA M. MILLS
Keyword(s):  
Food Vacuole ◽  
Ion Concentration ◽  
Limiting Factors ◽  
Food Ingestion ◽  
Ciliary Movement ◽  
Vacuole Formation ◽  
Alkaline Side ◽  
Food Vacuoles ◽  
Alkaline Range ◽  
Rate Of Movement

1. The effect exerted by the pH of their medium on Colpidium is determined quantitatively by counting the average number of food vacuoles formed in a given time when Colpidium is supplied with Indian ink. 2. Graphs obtained by plotting the rate of feeding against the pH of the medium show a characteristic depression on the alkaline side of neutrality (pH 7.5-8.5), on a curve which otherwise rises steadily from pH 4.5 to a maximum at pH 6.0, and falls from here gradually through the alkaline range. 3. Methods for measuring the rate of movement of ciliates are described, the most practicable being those in which their galvanotropic and geotropic reactions are used to control the direction of the movement. The effect of changes in the pH of the medium on the rate of movement of Colpidium was found to correspond very closely to the effect of similar pHs on the rate of food ingestion. It is, therefore, suggested that changes in the rate of ciliary movement are largely responsible for changes in the rates of food ingestion. 4. Mucus, produced for food collection, and probably also present in the fluid in which the cilia are working, is shown to have a maximum viscosity at pH 8.0. It is suggested that the depression in the region of pH 8.0, seen in curves representing changes in the rates of feeding and movement with pH, indicate that the viscosity of the fluid in which the cilia are beating is one of the limiting factors in the rate of food ingestion through the range of pH occupied by the depression.

scholarly journals ADF/Cofilin Is Not Essential but Is Critically Important for Actin Activities during Phagocytosis in Tetrahymena thermophila

2013 ◽  
Vol 12 (8) ◽  
pp. 1080-1086 ◽  
Author(s):  
Nanami Shiozaki ◽  
Kentaro Nakano ◽  
Yasuharu Kushida ◽  
Taro Q. P. Noguchi ◽  
Taro Q. P. Uyeda ◽  
...  
Keyword(s):  
Tetrahymena Thermophila ◽  
Food Vacuole ◽  
Content Type ◽  
Vacuole Formation ◽  
Future Studies ◽  
Cellular Events ◽  
Food Vacuoles

ABSTRACT ADF/cofilin is a highly conserved actin-modulating protein. Reorganization of the actin cytoskeleton in vivo through severing and depolymerizing of F-actin by this protein is essential for various cellular events, such as endocytosis, phagocytosis, cytokinesis, and cell migration. We show that in the ciliate Tetrahymena thermophila , the ADF/cofilin homologue Adf73p associates with actin on nascent food vacuoles. Overexpression of Adf73p disrupted the proper localization of actin and inhibited the formation of food vacuoles. In vitro , recombinant Adf73p promoted the depolymerization of filaments made of T. thermophila actin (Act1p). Knockout cells lacking the ADF73 gene are viable but grow extremely slowly and have a severely decreased rate of food vacuole formation. Knockout cells have abnormal aggregates of actin in the cytoplasm. Surprisingly, unlike the case in animals and yeasts, in Tetrahymena , ADF/cofilin is not required for cytokinesis. Thus, the Tetrahymena model shows promise for future studies of the role of ADF/cofilin in vivo .

Cortical microtubular structures of the ciliate Lepidotrachelophyllum fornicis Nicholls &Lynn, 1984 and phytogeny of the litostomate ciliates

1985 ◽  
Vol 63 (8) ◽  
pp. 1835-1845 ◽  
Author(s):  
Denis H. Lynn ◽  
Kenneth H. Nicholls
Keyword(s):  
Short Distance ◽  
Body Shape ◽  
Longitudinal Axis ◽  
Food Vacuole ◽  
Dense Material ◽  
Cellular Mechanisms ◽  
Vacuole Formation ◽  
The Right ◽  
Microtubular Structures ◽  
Shape Changes

The somatic and oral cortical ultrastructure of Lepidotrachelophyllum fornicis Nicholls &Lynn, 1984 are described. The somatic kinetids are monokinetids whose fibrillar associates include the following: (i) a kinetodesmal fibril which originates near triplets 6, 7, and 8 and extends laterally and to the right at an angle of about 45° to the longitudinal axis of the kinety; (ii) a postciliary ribbon which originates in dense material near triplet 9 and extends posteriorly and to the right; (iii) a primary transverse ribbon which originates near triplets 3, 4, and 5 and extends to the left and anteriorly; (iv) a secondary transverse ribbon which originates near triplet 5 and curves to extend to the lateral left; and (v) a ribbon of rootlet microtubules which originates on the left at the base of the kinetosome. The oral kinetids are dikinetids. The ciliated posterior kinetosome has the following: (i) a postciliary ribbon which extends posteriorly and to the right; and (ii) a transverse ribbon which extends only a short distance anteriorly. The nonciliated anterior kinetosome has the following: (i) a single postciliary microtubule; (ii) a large transverse ribbon which extends into the oral cone; and (iii) near its base a hexagonal nematodesma. The cytopharyngeal apparatus or rhabdos is described and a schematic figure is presented. The cellular mechanisms underlying body shape changes and food vacuole formation and the phylogeny of the class Litostomatea are discussed.

The Effect of pH on Food-Vacuole Formation in Paramecium

1942 ◽  
Vol 15 (4) ◽  
pp. 459-465 ◽  
Author(s):  
J. Warren Lee
Keyword(s):  
Food Vacuole ◽  
Effect Of Ph ◽  
Vacuole Formation
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