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An aster is a cellular structure shaped like a star, consisting of a centrosome and its associated microtubules during the early stages of mitosis in an animal cell. [ 1 ]: 221 Asters do not form during mitosis in plants. Astral rays, composed of microtubules, radiate from the centrosphere and look like a cloud.
This review article briefly describes the history of the development of animal-cell culture media, with comments on the types of media in general use today regarding their characteristics, roles of the medium components, and pitfalls or problems with their use.
- Tatsuma Yao, Yuta Asayama
- 2017
- Asters and Cell Division
- Asters in Mitosis
- How Asters Induce Cleavage Furrow Formation
Asters are vital to the processes of mitosis and meiosis. They are a component of the spindle apparatus, which also includes spindle fibers, motor proteins, and chromosomes. Asters help to organize and position the spindle apparatus during cell division. They also determine the site of the cleavage furrow that splits the dividing cell in half durin...
Asters initially appear in prophase. They form around each centriole pair. Asters organize spindle fibers that extend from the cell poles (polar fibers) and fibers that attach to chromosomes at the...Spindle fibers move chromosomes to the center of the cell during metaphase. Chromosomes are kept in place at the metaphase plate by the equal forces of the spindle fibers pushing on the centromeres...Duplicated chromosomes (sister chromatids) separate and are pulled toward opposite ends of the cell during anaphase. This separation is accomplished as spindle fibers shorten, pulling attached chro...In telophase, spindle fibers break down and separated chromosomes are enveloped within their own nuclear envelope.Asters induce cleavage furrow formation due to interactions with the cell cortex. The cell cortex is found directly beneath the plasma membrane and consists of actin filaments and associated proteins. During the course of cell division, asters growing from centrioles extend their microtublules toward one another. Microtubules from nearby asters int...
- Regina Bailey
The saying “written in the stars” expresses the belief that cosmic or universal forces control the future, a theme found in this story as well as works of history, literature, and oral tradition around the world since time immemorial.
Apr 28, 2017 · Three subgroups of microtubules aid in the process of mitosis: astral, polar, and kinetochore microtubules. Astral microtubules radiate from the MTOCs of a cell to the cell membrane, keeping the mitotic spindle in place. Polar microtubules intertwine between two MTOCs and help separate chromosomes.
The concept derives from the philosophy of Plato: the word 'astral' means 'of the stars'; thus the astral plane consists of the Seven Heavens of the classical planets.
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Jan 1, 2014 · Astrology appears to be a universal feature of human culture and may be understood as a form of cultural astronomy; an important contribution to the understanding of astronomy’s cultural uses, applications, uses, and functions; and an indication of society’s attitudes to the stars.
