PARAMECIUM BURSARIA: LIFE HISTORY. I. IMMATURITY, MATURITY AND AGE
نویسندگان
چکیده
منابع مشابه
Micronuclear Variation in Paramecium bursaria
THE dimorphic condition of the nuclear apparatus of the Infusoria is one of the most interesting and characteristic specializations exhibited by the group, apparently representing a segregation of ' somatic' and ' germinal' elements into distinct macronuclei and micronuclei. Accordingly these bodies have been extensively studied during the various life-processes of the Infusoria. Furthermore, s...
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M O S T ciliate cells possess a macronucleus and a micronucleus which differ markedly in size and function. Although these differences are stable and heritable, a large body of results has led to the conclusion that the two nuclei are qualitatively isogenic. Crosses in Paramecium buryaria to be discussed here provide direct evidence for the existence of a heterocaryon, an exceptional line in wh...
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Cells of Paramecium caudatum in the immaturity period of the life cycle contain substances which repress the expression of mating ability when introduced into mature cells. When 5 x 10 /tm of immature cytoplasm were injected into mature cells, loss of mating ability occurred and it continued for more than 15 fissions after the injection. The effective substances are contained in the soluble fra...
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Circadian changes in behaviour and electrical properties of the membrane were investigated in Paramecium bursaria. Both photoaccumulation and swimming velocity were at a higher level during the day than at night. During the day, swimming velocity decreased as light intensity was increased and the cells almost stopped at the intensity at which they showed the maximum degree of photoaccumulation....
متن کاملSimultaneous Evaluation of Life Cycle Dynamics between a Host Paramecium and the Endosymbionts of Paramecium bursaria Using Capillary Flow Cytometry
Endosymbioses are driving forces underlying cell evolution. The endosymbiosis exhibited by Paramecium bursaria is an excellent model with which to study symbiosis. A single-cell microscopic analysis of P. bursaria reveals that endosymbiont numbers double when the host is in the division phase. Consequently, endosymbionts must arrange their cell cycle schedule if the culture-condition-dependent ...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1944
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1538335