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Chemical energy is the energy of chemical substances that is released when the substances undergo a chemical reaction and transform into other substances. Some examples of storage media of chemical energy include batteries, [1] food, and gasoline (as well as oxygen gas, which is of high chemical energy due to its relatively weak double bond [2] and indispensable for chemical-energy release in ...
An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized from scratch by the organism fast enough to supply its demand, and must therefore come from the diet. Of the 21 amino acids common to all life forms, the nine amino acids humans cannot synthesize are valine , isoleucine , leucine , methionine ...
The basic needs approach is one of the major approaches to the measurement of absolute poverty in developing countries globally. It works to define the absolute minimum resources necessary for long-term physical well-being, usually in terms of consumption goods.
Examples include iron, essential to hemoglobin; and magnesium, essential to chlorophyll. Some elements are essential only to certain taxonomic groups of organisms, particularly the prokaryotes. For instance, the lanthanide series rare earths are essential for methanogens. As shown in the following table, there is strong evidence that 19 of the ...
Example 4 If the U.S. Congress passes a bill, the president's signing of the bill is sufficient to make it law. Note that the case whereby the president did not sign the bill, e.g. through exercising a presidential veto, does not mean that the bill has not become a law (for example, it could still have become a law through a congressional ...
An Amblypodia anita (purple leaf blue butterfly) gathering nutrients from guano. Nutrition is the biochemical and physiological process by which an organism uses food to support its life.
The original WHO definition in 1977 was that they were medicines "of utmost importance, basic, indispensable, and necessary for the healthcare needs of the population". [9] The concept was mentioned in one of the ten points of the 1978 Alma Ata Declaration on primary health care. In 2002 the definition was changed to:
A definition is a statement of the meaning of a term (a word, phrase, or other set of symbols). [1] [2] Definitions can be classified into two large categories: intensional definitions (which try to give the sense of a term), and extensional definitions (which try to list the objects that a term describes). [3]