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The growth and proliferation rates of cells vary within the meristem, with higher activity at the periphery compared to the central region. The term meristem was first used in 1858 by Swiss botanist Carl Wilhelm von Nägeli (1817–1891) in his book Beiträge zur Wissenschaftlichen Botanik ("Contributions to Scientific Botany"). [2]
Traditionally, plant stem cells were thought to only exist in SAM and RAM and studies were conducted based on this assumption. However, recent studies have indicated that (pro)cambium also serves as a niche for plant stem cells: "Procambium cells fulfill the criteria for being stem cells since they have the capacity for long-term self renewal and being able to differentiate into one or more ...
This is a list of current formations of the United States Army, which is constantly changing as the Army changes its structure over time. Due to the nature of those changes, specifically the restructuring of brigades into autonomous modular brigades, debate has arisen as to whether brigades are units or formations; for the purposes of this list, brigades are currently excluded.
The United States Armed Forces is composed of six coequal military service branches. Five of the branches, the United States Army, United States Marine Corps, United States Navy, United States Air Force, and United States Space Force, are part of the Department of Defense.
Continued growth occurs in the rhizome, where a lateral meristem takes over to form another pseudobulb and repeat the process. This process is evident in the jointed appearance of the rhizome, where each segment is the product of an individual meristem, but the sympodial nature of a stem is not always clearly visible.
The United States Army (USA) is the primary land service branch of the United States Armed Forces. It is designated as the Army of the United States in the United States Constitution . [ 14 ] It is one of the six armed forces and one of the eight Uniformed services of the United States .
The Armaments Center was established in February 2019, when it was aligned with the United States Army Futures Command along with its senior organization, the United States Army Combat Capabilities Development Command. Armaments Center was called the U.S. Army Armament Research Development and Engineering Center (ARDEC).
Co-sponsored by the United States Army War College and the Dwight D. Eisenhower National Security Series, on November 22 and 23, it brought together present and former defense officials and military commanders to assess the Department of Defense's progress in achieving a "transformation" of U.S. military capabilities.