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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.
Along with climate and corresponding types of vegetation, the economy of a nation also influences the level of agricultural production. Production of some products is highly concentrated in a few countries, China, the leading producer of wheat and ramie in 2013, produces 95% of the world's ramie fiber but only 17% of the world's wheat. Products ...
This article includes the table with land use statistics by country. Countries are ranked by their total cultivated land area, which is the sum of the total arable land area and total area of permanent crops. Arable land is defined as being cultivated for crops like wheat, maize, and rice, all of which are replanted after each harvest.
Mitotic indexing is the oldest method of assessing proliferation and is determined by counting the number of mitotic figures (cells undergoing mitosis) through a light microscope on H&E stained sections. It is usually expressed as the number of cells per microscopic field.
Arable density (m² per capita) by country. This is a list of countries ordered by physiological density."Arable land" is defined by the UN's Food and Agriculture Organization, the source of "Arable land (hectares per person)" as land under temporary crops (double-cropped areas are counted once), temporary meadows for mowing or for pasture, land under market or kitchen gardens, and land ...
Its share of agricultural land and farms continues to grow in many countries. The main results of the global survey on certified organic farming show that 32.2 million hectares of agricultural land are managed organically by more than 1.2 million producers, including smallholders (2007).
Some jurisdictions further subdivide agricultural zones to distinguish industrial farming from uses like rural residence farms and retirement farms on large lots. [3] One example of such zoning is the Agricultural Reserve in Montgomery County, Maryland. The reserve was established in 1980 to preserve farmland and rural space. [4]
Altitudinal zones of Andes Mountains and corresponding communities of agriculture and livestock raised. Human populations have developed agricultural production strategies to exploit varying characteristics of altitudinal zones. Elevation, climate, and soil fertility set upper limits on types of crops that can reside in each zone.