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    Home > Biochemistry News > Plant Extracts News > Plant cells have silk division observed

    Plant cells have silk division observed

    • Last Update: 2021-01-08
    • Source: Internet
    • Author: User
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    silk split, also known as indirect split, by W. Fleming (1882) was first discovered in animals and E. Strasburger (1880) was discovered in plants. Characterized by the appearance of spindle chromosomes, subsomals are evenly distributed to subcellulars, a form of division commonly found in higher plants and animals (animals and higher plants). It is the process by which the nucleocytes divide to produce sochi cells.。 Cell cycles
    and division are cyclical. That is, a cell that divides continuously, starting when one division is complete and continuing until the next division is complete, is a cell cycle. A cell cycle consists of two stages: the intersessive period and the division period, (the time difference between these two stages is large, generally between division periods accounted for 90%-95% of the cell cycle; the division period accounted for about 5% to 10% of the cell cycle.) Cell types vary, and the time of a cell cycle is different. The period of division is divided into the pre-secession period, the middle-term division, the late period of division and the end of division. Cells must be prepared for certain substances before they can divide. Cell proliferation involves material preparation and cell division throughout the process. Silk splitting is a continuous process divided into five periods in order of inter-period, pre-, mid-term, late and late period, and sometimes a pre-middle period between the early and medium periods.
    period between the twoThere are three stages, G1 (
    DNA
    synthetic pre-synthesis), S (DNA synthesis phase), G2 (late DNA synthesis), wherein G1 and G2 phase RNA (i.e. nuclear sugar
    nucleic acid
    ) replication and related
    protein
    synthesis, S phase DNA replication. Among them, G1 is mainly the synthesis of chromosomal proteins and DNA de-cyclonease, G2 is mainly the synthesis of enzymes and spindle proteins during cell division. During the period of silk division, chromatin does not form chromosomes with a high helix, but rather a single-stranded copy of DNA (i.e. DNA) in the form of chromatin. There is an important preparation process for the whole process of silk splitting, which is an important basic work. (Modern medicine, the use of drugs, to stop the formation of spindle wire in cells, thereby inhibiting the cell silk division, cell division stopped at the G0 stage, the use of the technology of the drug effectively curbed the malignant proliferation and spread of cancer cells.) Theperiodthe period between theperiod and the disintegration of the nucleofilm. When interstitial cells enter the pre-silk division stage, the volume of the nucleation increases, and the fine staining lines composed of chromosomes gradually shorten and thicken, forming chromosomes. Because chromosomes have replicated over time, each chromosome consists of two chromosome monosomes. The nuclear kernels faded away in the second half of the first half. At the end of the previous period, the nucleoblast ruptured, and chromosomes were scattered in the cytoste.
    animal cells have silk division in the early stages near the nuclear membrane has two central bodies. Each center body consists of a pair of center grains and a bright field around them, called a center mass or center ball. Astrogenic silk, or radial microtranscing, is radiates from the central body. The two central bodies with astrogen wire gradually separate and move to the opposite poles. This separation process is presumed to be due to the rapid growth of the astral silk microchip interaction between the two central bodies, resulting in the two central bodies (two pairs of central particles) pushed to the poles, and finally formed a spindle between the poles after the rupture of the nuclear membrane.from the rupture of the nuclear membrane until chromosomes are arranged on the equatorial surface. Pieces of the nucleofilm remain in the cytoste, which are not easily distinguished from the endosome mesh and can sometimes be seen around the spindle body.。The main processes in the pre-mid-term are the final formation of the spindle body and the movement of the chromosome towards the equatorial surface. There are two types of spindles: one is an astrogenic spindle, i.e. each pole has a pair of central particles as the core of the star, seen in the vast majority of animal cells and some lower plant cells. One is a non-star spindle body. Polar astrogens, seen in higher plant cells.It was once thought that the star spindle body contains three kinds of spindle wire, that is, three kinds of micro-tubes.
    One is a star microcontrol, a micro tube scattered by a star;
    2 is a microcontrol, a micro tube that stretches from the poles to the opposite level, overlapping the polar tubes from the poles in the equatorial region. It is now thought that the micro tube may have been formed by the elongation of the star micro tube.
    third is a silk dot micro-tube, and a silk dot-linked micro-tube, also known as silk dot silk or traction wire. A silk dot is a structure that develops on both sides of a chromosome's silk grain. There are reports that silk dots have the function of polymerization of micro-tube proteins into micro-tubes. Non-star spindle body only micro-tubes and silk-dot micro-tubes.
    。Chromosomes are dispersed in the cytoste after a ruptured nucleofilm. The silk points of the two chromosomes of each chromosome are connected to the poles by the silk dots. As a result of the interaction between the micro tube and the silk micro tube, the chromosomes move toward the equatorial surface. Finally, the forces are balanced, and the chromosomes are arranged on the equatorial surface. 。
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