Polyploidy in Paramecium Bursaria
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...
متن کاملA Heterocaryon in PARAMECIUM BURSARIA.
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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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....
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1 Graham, R. M., Surg. Gynec. & Obst., 84, 153-173 (1947). 2 Henshaw, P. S., J. Nat. Cancer Inst., 4, 485-501 (1944). 3Larkin, J. C., Am. J. Roentgenol., 55, 525-532 (1946). 4 Hektoen, L., J. Infect. Dis., 22, 28-33 (1918). 6 Auer, J., and Witherbee, W. D., J. Exper. Med., 33, 791-813 (1921). 6 Treadwell, H., Gardner, W. V., and Laurence, J. H., Endocrinology, 32, 161-164 (1943). 7 EIlinger, F....
متن کاملThe Genic Control of Mating Types in Paramecium Bursaria.
Jennings"l discovery of a system of multiple mating types in Paramecium bursaria in 1938 followed closely Sonneborn's2 initial description of mating types in P. aurelia. The detailed and brilliant experimental analyses carried out by Jennings3 and directed toward an understanding of mating type inheritance and determination in this organism did not result in a satisfactory explanation for the v...
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1940
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.26.4.239