Nuclear reorganization in non-sporing bacteria

K. A. Bisset

doi:10.1017/s0022172400036263

Nuclear reorganization in non-sporing bacteria

Journal of Hygiene ◽

10.1017/s0022172400036263 ◽

1948 ◽

Vol 46 (2) ◽

pp. 173-175 ◽

Cited By ~ 12

Author(s):

K. A. Bisset

Keyword(s):

Nuclear Fusion ◽

Nuclear Reorganization ◽

Fusion Nucleus

1. The process of nuclear fusion and reorganization as it occurs in members of the Bacteriaceae is described.2. The chromosomes behave as pairs at all times, the normal bacillus, of smooth morphology, contains two pairs.3. The fusion nucleus contains three pairs and is preceded by a corresponding trinucleate bacillus.4. One division of the chromosomes takes place in the fusion nucleus, and another during the process of redistribution of the chromosomes. The second division is followed by fragmentation, and return to the bacillary condition.

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The occurrence of nuclear fusion in the amoebal phase of the slime mold Echinostelium minutum: a reinterpretation of the significance of this phenomenon

Canadian Journal of Botany ◽

10.1139/b77-340 ◽

1977 ◽

Vol 55 (24) ◽

pp. 3020-3022 ◽

Cited By ~ 2

Author(s):

E. F. Haskins

Keyword(s):

Nuclear Fusion ◽

Slime Mold ◽

Daughter Cells ◽

Fusion Nucleus ◽

Feulgen Cytophotometry ◽

Synchronous Mitosis

Nuclear fusion occurs in less than 1% of the myxamoebae of Echinostelium minutum de Bary, isolate D-3, sublines 1965 and 1971. Binucleate amoebae undergo synchronous mitosis, the two nuclei fuse, the fusion nucleus divides, cytokinesis occurs, and uninucleate daughter cells are formed. Failure to find a haploid–diploid alternance between the amoebal and plasmodial phases using Feulgen cytophotometry suggests that nuclear fusion is not a prerequisite for plasmodial formation in this isolate. Nuclear fusion may be one of the mechanisms which has led to the polyploid condition of the 1971 subline. This phenomenon may also represent a parasexual process.

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Laser scanning confocal microscopic analysis of cytoskeletal and nuclear reorganization in live Drosophila embryos

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100146710 ◽

1993 ◽

Vol 51 ◽

pp. 174-175

Author(s):

William Theurkauf

Keyword(s):

Laser Scanning ◽

Microscopic Analysis ◽

Large Cell ◽

Early Embryo ◽

Drosophila Embryo ◽

Cortical Actin ◽

Nuclear Reorganization ◽

Cytoskeletal Elements ◽

Microtubule Structure ◽

Drosophila Embryos

Cell division in eucaryotes depends on coordinated changes in nuclear and cytoskeletal components. In Drosophila melanogaster embryos, the first 13 nuclear divisions occur without cytokinesis. During the final four divisions, nuclei divide in a uniform monolayer at the surface of the embryo. These surface divisions are accompanied by dramatic changes in cortical actin and microtubule structure (Karr and Alberts, 1986), and inhibitor studies indicate that these changes are essential to orderly mitosis (Zalokar and Erk, 1976). Because the early embryo is syncytial, fluorescent probes introduced by microinjection are incorporated in structures associated with all of the nuclei in the blastoderm. In addition, the nuclei divide synchronously every 10 to 20 min. These characteristics make the syncytial blastoderm embryo an excellent system for the analysis of mitotic reorganization of both nuclear and cytoskeletal elements. However, the Drosophila embryo is a large cell, and resolution of cytoskeletal filaments and nuclear structure is hampered by out-of focus signal.

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