EurekaMag.com logo
+ Site Statistics
References:
53,214,146
Abstracts:
29,074,682
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The mode of function of the cyto pharyngeal basket of the ciliate pseudomicrothorax dubius






Differentiation 14(3): 147-158

The mode of function of the cyto pharyngeal basket of the ciliate pseudomicrothorax dubius

The ciliate P. dubius feeds on filamentous blue-green algae, ingesting them at rates of up to 15 .mu.m/s, by a cytopharyngeal basket. The wall of the basket is composed of 22 .+-. 3 nemadesmata, each of which is a bundle of .apprx. 200 microtubules which are cross-linked in a hexagonal pattern. The lumen of the non-feeding basket is filled with cytoplasma into which project the nemadesmal lamellae. Each nemadesmal lamella is attached to a nemadesm and consists of a single row of 20-30 microtubules. Each microtubule of the nemadesmal lamella bears a row of pairs of arm-like projections which are embedded in a filamentous matrix. During feeding, the lumen of the basket is occupied by the developing food vacuole. The nemadesmal lamellae are observed between the vacuole membrane and the nemadesmata, and the arms of the nemadesmal lamellae microtubules are oriented toward the membrane of the food vacuole or of small vesicles. A mechanism for the generation of force for phagocytosis by the microtubule arms is proposed. During food uptake the membrane of the food vacuole increases rapidly at rates up to 270 .mu.m2/ s. Vacuole growth results from the fusion of membrane-bound vesicles. During phagocytosis a fast streaming of these vesicles can be observed in the cytoplasm surrounding the basket. The direction of streaming is opposite to that of ingestion of the algal filament. The vesicles enter the lumen of the basket at its anterior end, in a zone where the wall of the basket is perforated.

(PDF 0-2 workdays service: $29.90)

Accession: 006719420



Related references

Electron microscopic localization of ATPase activity in the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. Differentiation; Research in Biological Diversity 22(2): 67-72, 1982

Microtubules and microfilaments as major components of a phagocytic apparatus: the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. Differentiation; Research in Biological Diversity 11(3): 157-167, 1978

Demonstration of tubulin, actin and -actinin by immunofluorescence in the microtubule-microfilament complex of the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. Experimental Cell Research, 1252: 265-274, 1980

Demonstration of tubulin, actin and alpha-actinin by immunofluorescence in the microtubule-microfilament complex of the cytopharyngeal basket of the ciliate Pseudomicrothorax dubius. Experimental Cell Research 125(2): 265-274, 1980

The epiplasm of the ciliate pseudomicrothorax dubius cytoskeleton. Archiv fuer Protistenkunde 124(4): 410-416, 1981

Characteristics of the membranes of the pellicle of the ciliate pseudomicrothorax dubius. Protoplasma 100(2): 199-214, 1979

Effects of cations on phagocytosis in the ciliate pseudomicrothorax dubius. Journal of Protozoology 32(3): 501-508, 1985

Development of compound trichocysts in the ciliate pseudomicrothorax dubius. Protoplasma 92(3-4): 263-268, 1977

Determination of trichocyst position by the epiplasm in the ciliate Pseudomicrothorax dubius. Proceedings of the International Congress of Protozoology, 5: 294, 1979

Immunological characterization of trichocyst proteins in the ciliate Pseudomicrothorax dubius. Journal Of Eukaryotic Microbiology. 40(1): 81-90, 1993