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The eukaryotic cell cycle is very complex and is one of the most studied topics, since its misregulation leads to cancers. It is possibly a good example of a mathematical model as it deals with simple calculus but gives valid results. Two research groups [1] [2] have produced several models of the cell cycle simulating several organisms. They ...
The eukaryotic cell cycle consists of four distinct phases: G 1 phase, S phase (synthesis), G 2 phase (collectively known as interphase) and M phase (mitosis and cytokinesis). M phase is itself composed of two tightly coupled processes: mitosis, in which the cell's nucleus divides, and cytokinesis, in which the cell's cytoplasm and cell membrane divides forming two daughter cells.
A screenshot from the video, depicting a motor protein moving a vesicle by crawling along a microtubule. The Inner Life of the Cell is an 8.5-minute 3D computer graphics animation illustrating the molecular mechanisms that occur when a white blood cell in the blood vessels of the human body is activated by inflammation ( Leukocyte extravasation ).
Metaphase (from Ancient Greek μετα- beyond, above, transcending and from Ancient Greek φάσις (phásis) 'appearance') is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their second-most condensed and coiled stage (they are at their most condensed in anaphase). [1]
The cell is the basic structural and functional unit of all forms of life. Every cell consists of cytoplasm enclosed within a membrane; many cells contain organelles, each with a specific function. The term comes from the Latin word cellula meaning 'small room'. Most cells are only visible under a microscope.
If is cellular with cell-datum (,,,) and is an ideal (a downward closed subset) of the poset then ():= (where the sum runs over and , ()) is a two-sided, -invariant ideal of and the quotient / is cellular with cell datum (,,,) (where i denotes the induced involution and M, C denote the restricted mappings).
If cell walls were truly rigid, plants could not wilt (think about it). The cell wall is a woven flexible framework that is made rigid primarily by the osmotic pressure exerted from the inside by the cell inside its membrane. Further reinforcement is made in vascular plants by the addition of lignin to the walls once primary growth is complete.
This image was selected as picture of the day on Wikimedia Commons for 2 January 2013. It was captioned as follows: It was captioned as follows: English: Diagram of mitosis in animal cells.