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The mitotic index is a measure of cellular proliferation. [1] It is defined as the percentage of cells undergoing mitosis in a given population of cells. Mitosis is the division of somatic cells into two daughter cells. Durations of the cell cycle and mitosis vary in different cell types. An elevated mitotic index indicates more cells are dividing.
Mitotic counting has also been shown in multiple studies to have prognostic value in breast cancer, where a lower count of mitotic cells correlates with a more favorable outcome, and thus has been incorporated into part of the histological grading system. The Ki-67 labelling index has also been found to have prognostic significance where in ...
The Holdridge life zones system is a global bioclimatic scheme for the classification of land areas. It was first published by Leslie Holdridge in 1947, and updated in 1967. It is a relatively simple system based on few empirical data, giving objective criteria. [ 1 ]
This is an accepted version of this page This is the latest accepted revision, reviewed on 29 January 2025. Process in which chromosomes are replicated and separated into two new identical nuclei For the type of cell division in sexually reproducing organisms used to produce gametes, see Meiosis. For excessive constriction of the pupils, see Miosis. For the parasitic infestation, see Myiasis ...
The life zone concept was developed by C. Hart Merriam in 1889 as a means of describing areas with similar plant and animal communities. Merriam observed that the changes in these communities with an increase in latitude at a constant elevation are similar to the changes seen with an increase in elevation at a constant latitude.
mitotic index (MI) The proportion of cells within a sample which are undergoing mitosis at the time of observation, typically expressed as a percentage or as a value between 0 and 1. The number of cells dividing by mitosis at any given time can vary widely depending on organism, tissue, developmental stage, and culture media, among other ...
Specialized Strategy – focuses on a single zone and specializes in the agricultural activities suitable to that elevation, developing elaborate trade relationships with external populations; With improved accessibility to new farming techniques, populations are adopting more specialized strategies and moving away from generalized strategies.
The production of mitotic spindles, as well as SHH signaling and the operation of its interactors, are all likely impacted by STIL overexpression, which is linked to a high histopathological mitotic index in tumors. Overexpression of STIL may function as oncogenes and cause cancer by encouraging spindle abnormalities.