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  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of spindle fibers and microtubules during anaphase and phragmoplast formation (1972)
    Springer
    Chromosoma 39 (1972), S. 101-144 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Detailed correlation of in vitro observations with the arrangement of microtubules (MTs) during anaphase-telophase were made on endosperm of Haemanthus katherinae. It is stressed that the general course of events leading to the formation of the phragmoplast is the same in all cells, but considerable variation of details may be found in different objects and even in various cells of the same tissue. The changes of MT arrangement in the interzonal region responsible for formation of the phragmoplast already occur in anaphase. During this stage continuous fibers (composed of numerous MTs) lengthen, become thinner (the number of MTs on a cross-section decreases), and often seem to break. After mid-anaphase, thin fibers begin to oscillate transversely to the axis of the phragmoplast and often are considerably laterally displaced (lateral movements). The longest MTs in the phragmoplast are present during oscillations and lateral movements. The new MTs arise in the phragmoplast regions depleted of MTs as a result of lateral movements (usually geometric central region of the phragmoplast). Clusters of vesicles, which accumulate in relation to MTs which move, fuse and form the cell plate. After the fusion, the number and the length of MTs decrease. Several processes are superimposed and occur simultaneously. Also the cell plate is, as a rule, in different stages of development in various regions of the phragmoplast. The movements of MTs and fusion of the vesicles is complex and the details of these processes are not entirely clear. The data supplied here modify some generally accepted concepts of phragmoplast formation and development. This concerns the center of origin of new MTs, the moment when they arise, and the way they subsequently behave.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319839
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  • 2
    Electronic Resource
    Electronic Resource
    Microtubule converging centers and reorganization of the interphase cytoskeleton and the mitotic spindle in higher plant Haemanthus (1994)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 27 (1994), S. 219-233 
    Details
    ISSN: 0886-1544
    Keywords: microtubules ; mitosis ; cytoskeleton reorganization ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We analyzed the distribution and orientation of transitory microtubule structures, microtubule converging centers, during interphase and mitosis in endosperm of the higher plant Haemanthus. In interphase the pointed tips of microtubule converging centers are associated with the nuclear envelope. Their orientation gradually reverses during prophase, and the tips tend to point away from the nucleus. From prometaphase through early telophase, microtubule converging centers are present predominantly in the cytoplasm at the polar region. They are either “free” or associated with chromosomes or microtubule bundles. In late telophase, pointed tips of microtubule converging centers are again associated with the reconstructed nuclear envelope and, additionally, they often appear in the phragmoplast area. The orientation of microtubule converging centers seems to be directly correlated to the previously determined microtubule polarity, with the converging tip being minus and the diverging one, plus.Elevated temperature (35°-37°) enhances the number of microtubule converging centers in the cytoplasm and at the nuclear envelope. This is especially pronounced during the telophase-interphase transition and in some interphase cells, indicating temperature and stage dependence.Our data imply that microtubule converging centers bind together MT minus ends and, thus, control the predominant direction of elongation and shortening of microtubule arrays. We argue that these configurations are instrumental during the reorganization of interphase cytoskeleton and mitotic spindle in Haemanthus endosperm. © 1994 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970270304
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  • 3
    Electronic Resource
    Electronic Resource
    Three-dimensional localization and redistribution of F-actin in higher plant mitosis and cell plate formation (1988)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 10 (1988), S. 217-228 
    Details
    ISSN: 0886-1544
    Keywords: immunogold ; microtubules ; optical sectioning ; video microscopy ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The distribution of F-actin cables in dividing endosperm cells of a higher plant, Haemanthus, was visualized with the immunogold-silver-enhanced method and compared with the arrangement of immunogold-stained microtubules in the same cells. The three-dimensional distribution of F-actin cables and microtubules during mitosis and cell plate formation was analyzed using ultrathin optical sectioning of whole mounts in polarized light video microscopy. F-actin cables form a loose irregular network in the interphase cytoplasm. Much of this network remains outside of the spindle during mitosis. A few F-actin cables were detected within the spindle. Their pronounced rearrangement during mitosis appears to be related to the presence and growth of microtubule arrays. During prometaphase, actin cables located on the spindle surface and those present within the spindle tend to arrange parallel to the long axis of the spindle. Cables outside the spindle do not reorient, except those at the polar region, where they appear to be compressed by the elongating spindle. Beginning with mid-anaphase, shorter actin cables oriented in various directions accumulate at the equator. Some of them are incorporated into the phragmoplast and cell plate and are gradually fragmented as the cell plate is formed and ages. Actin cables adjacent to microtubule arrays often show a regular punctate staining pattern. Such a pattern is seldom observed in the peripheral cytoplasm, which contains few microtubules. The rearrangement of F-actin cables mimicks the behavior of spindle inclusions, such as starch grains, mitochondria, etc., implying that F-actin is redistributed passively by microtubule growth or microtubule-related transport. Thus F-actin or actomyosin-based motility does not appear to be directly involved in mitosis and cytokinesis in higher plants.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970100126
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  • 4
    Electronic Resource
    Electronic Resource
    Spindle poles in higher plant mitosis (1992)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 23 (1992), S. 1-7 
    Details
    ISSN: 0886-1544
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970230102
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  • 5
    Electronic Resource
    Electronic Resource
    Der Mechanismus der Chromosomen-bewegungen in der Mitose (1973)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 3 (1973), S. 99-107 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19730030403
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