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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]
[2] [failed verification] Two distinct areas of stem cells are recognised: the apical meristem and the lateral meristem. Plant stem cells are characterized by two distinctive properties, which are: the ability to create all differentiated cell types and the ability to self-renew such that the number of stem cells is maintained. [3]
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.
Growth rings result from new growth in the vascular cambium, a layer of cells near the bark that botanists classify as a lateral meristem; this growth in diameter is known as secondary growth. Visible rings result from the change in growth speed through the seasons of the year; thus, critical for the title method, one ring generally marks the ...
This is a list of U.S. states and territories by economic growth rate.This article includes a list of the 50 U.S. states, the District of Columbia, and the 5 inhabited U.S. territories sorted by economic growth — the percentage change in real GDP for the third quarter of 2023 is listed (for the 50 states and District of Columbia), using the most recent data available from the U.S. Bureau of ...
The growth in subscription services revenues is a result of the growth in our subscription billings, which also grew by 57% in Q4 to approximately $65 million, our fourth straight year of ...
US Dollar Index and major financial events. The U.S. Dollar Index (USDX, DXY, DX, or, informally, the "Dixie") is an index (or measure) of the value of the United States dollar relative to a basket of foreign currencies, [1] often referred to as a basket of U.S. trade partners' currencies. [2]
In the absence of an international mechanism tying the dollar to gold via fixed exchange rates, the dollar became a pure fiat currency and as such fell to its free market exchange price versus gold. Consequently, the price of gold rose from $35/ounce (1.125 $/g) in 1969 to almost $500 (29 $/g) in 1980.