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Precursors in the Halo series, an extremely advanced race that preceded and were destroyed by The Forerunners; Precursor, a 1999 novel set in C. J. Cherryh's Foreigner universe; Precursors, a fictional race (now extinct) of ancient beings in the board game Cosmic Encounter; Precursors, a fictional alien race in the Star Control video game series
In chemistry, a precursor is a compound that participates in a chemical reaction that produces another compound. In biochemistry , the term "precursor" often refers more specifically to a chemical compound preceding another in a metabolic pathway , such as a protein precursor .
The particular type of precursor characterized by increasing period and amplitude is known as the high-frequency Sommerfeld precursor. In a region of anomalous dispersion, where low-frequency components have faster group velocities than high-frequency ones, the opposite of the above situation occurs: the onset of the precursor is characterized ...
In biochemistry, a zymogen (/ ˈ z aɪ m ə dʒ ən,-m oʊ-/ [1] [2]), also called a proenzyme (/ ˌ p r oʊ ˈ ɛ n z aɪ m / [3] [4]), is an inactive precursor of an enzyme.A zymogen requires a biochemical change (such as a hydrolysis reaction revealing the active site, or changing the configuration to reveal the active site) for it to become an active enzyme.
NMN is the immediate precursor to NAD+ in the salvage pathway. [39] Besides assembling NAD + de novo from simple amino acid precursors, cells also salvage preformed compounds containing a pyridine base. The three vitamin precursors used in these salvage metabolic pathways are nicotinic acid (NA), nicotinamide (Nam) and nicotinamide riboside (NR ...
Drug precursors, also referred to as precursor chemicals or simply precursors, are substances used to manufacture illicit drugs. Most precursors also have legitimate commercial uses and are legally used in a wide variety of industrial processes and consumer products, such as medicines, flavourings, and fragrances.
Social Security is the U.S. government's biggest program; as of June 30, 2024, about 67.9 million people, or one in five Americans, collected Social Security benefits. This year, we're seeing a...
The concept has been applied to those who would find precursors of Darwin in the early nineteenth century, [3] and to those who would find anticipations of modern science in ancient cultures from the Near East to Mesoamerica. [4] Precursorism has recently been identified as a significant factor in some studies of the work of Islamic scientists. [5]
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