Results 131 to 140 of about 2,390 (165)

The formation of the feeding organelle in Paramecium aurelia

Journal of Experimental Zoology, 1973
AbstractThe control of formation of the feeding or buccal structures in Paramecium aurelia has been studied by damaging or eliminating this organelle by means of a microbeam of ultraviolet light and following the fate of treated cells through subsequent fissions and autogamy.
Earl D. Hanson, Ross M. Ungerleider
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Genetic Dissection of Active Electrogenesis in Paramecium aurelia

Nature, 1974
NEUROPHYSIOLOGISTS frequently use various drugs and toxins to interfere with specific membrane mechanisms. A genetic approach can achieve the same results. In taking this approach to the problem of excitation it is desirable to have an organism, like Paramecium, on which both formal genetic1 and orthodox electrophysiological2 studies can be made.
Ching Kung, Youko Satow
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Mitochondrial Genetics of Paramecium aurelia

1981
Publisher Summary This chapter discusses the mitochondrial genetics of Paramecium aurelia (P. aurelia). There are substantial differences among the mitochondrial genetic systems of the ciliate protozoa and corresponding systems in yeast and other groups.
A. Tait, G.H. Beale
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INDUCTION OF ENDOMIXIS IN PARAMECIUM AURELIA

The Biological Bulletin, 1937
In both stocks R and W of P. aurelia, endomixis can be induced by placing at 31° C. small mass cultures containing the surplus animals from isolation lines. In stock R, induction cultures set up soon after endomixis yielded conjugants, so that the induction of endomixis could not be studied quantitatively in these.
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Analysis of prefission morphogenesis in Paramecium aurelia

Journal of Experimental Zoology, 1968
AbstractParamecium aurelia has been exposed to varying concentrations of actinomycin D for extended periods and to a high concentration starting at various specific times in the cell cycle. Extended exposures at 5 μg of actinomycin per 1.0 ml of culture medium are lethal as are 24 hour exposures at 20 μ/1.0 ml.
Earl D. Hanson, Kulbir S. Gill
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Chapter 15 The Isolation of Nuclei from Paramecium aurelia

1975
Publisher Summary This chapter presents a comprehensive description, including failures, of methods for isolating macro- and micronuclei from Paramecium Aurelia. In the method for isolating macronuclei, the aim is to use conditions that (1) caused cell disruption but left the nuclei intact, (2) allowed isolation of at least 50% of the nuclei with ...
Donald J. Cummings, Andrew Tait
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Anatomy of mitochondrial DNA from Paramecium aurelia

Molecular and General Genetics MGG, 1980
The linear genome of mitochondrial DNA from four species of Paramecium aurelia was investigated with respect to restriction endonuclease fragments, location and number of ribosomal RNA genes, and interspecies EcoRI and HindIII fragment homologies. One copy of each of the rRNA genes was found in all four species and the 14s and 20s rRNA genes were ...
Jane L. Laping, Donald J. Cummings, Paul J. Conlon, Richard A. Maki   +3 more
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Studies on macronuclear DNA from Paramecium aurelia [PDF]

Chromosoma, 1975
Macronuclear DNA was isolated from purified macronuclei of Paramecium aurelia and the size distribution was determined with regard to growth phase and method of extraction. DNA molecules as long as 105 microns and as short as 0.2 microns were observed. It was concluded that the method of extraction affected the observed length of DNA extracted and that
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The Antigen System of Paramecium aurelia

1957
Publisher Summary The features of the antigen system of Paramecium aurelia are the following– (1) Cells containing a fixed set of genes can exist in a number of different states, as a consequence of which diverse products (antigens) may be formed, without any change in genic constitution. At least twelve such states are known in one stock but there
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Vitally stained kappa in Paramecium aurelia

Journal of Experimental Zoology, 1965
AbstractPurified kappa particles stained with methylene blue were placed into fluid containing paramecia. The vitally stained kappa quickly aggregated in food vacuoles of both sensitive and killer animals. A few filamentous projections were observed protruding into the cytoplasm from vacuoles containing kappa.
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