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Hematopoietic stem cells (HSCs) are the stem cells [1] that give rise to other blood cells.This process is called haematopoiesis. [2] In vertebrates, the first definitive HSCs arise from the ventral endothelial wall of the embryonic aorta within the (midgestational) aorta-gonad-mesonephros region, through a process known as endothelial-to-hematopoietic transition.
Migrants abandoned the worst-hit sections of Texas during the Dust Bowl years. Especially from this period on, Black people left Texas in the Great Migration to get work in the Northern United States or California and to escape segregation. [103] In 1940, Texas was 74% White, 14.4% Black, and 11.5% Hispanic. [124]
The simplest form of an organic molecule is the hydrocarbon, which is a large family of organic compounds that are composed of hydrogen atoms bonded to a chain of carbon atoms. A hydrocarbon backbone can be substituted by other elements such as oxygen (O), hydrogen (H), phosphorus (P), and sulfur (S), which can change the chemical behavior of ...
The Shanghai Cooperation Organisation (SCO) is a Eurasian political, economic, international security and defence organization established by China and Russia in 2001. It is the world's largest regional organization in terms of geographic scope and population, covering approximately 24% of the area of world (65% of Eurasia) [3] and 42% of the world population.
In England, as of August 2016, over 60% of the higher education providers directly funded by HEFCE (208/340) are sixth-form or further education colleges, often termed colleges of further and higher education, along with 17 colleges of the University of London, one university college, 100 universities, and 14 other providers (six of which use ...
In astronomy, dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation.Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be observed.
A significant new feature has been the extension of SSA to secondary education in the form of the Rashtriya Madhyamik Shiksha Abhiyan. [133] Rashtriya Madhyamik Shiksha Abhiyan (RMSA) which is the most recent initiative of Government of India to achieve the goal of universalisation of secondary education (USE).