cycle

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cycle

noun age, alternation, circle, circuit, consecution, course, eon, epoch, era, flow, period, recurrence, recurring period, regular return, regglarity of recurrence, repetitiveness, revolution, rotation, round, sequence, succession
See also: annum, frequency, life, sequence, succession
References in periodicals archive ?
At the centre of these predicted processes is the molecule called glyoxylate, which studies show could have been available on early Earth and is part of the citric acid cycle today.
Applying such an approach, Sabatine and colleagues (2005) demonstrated that the levels of functionally related metabolites of the citric acid cycle circulating in the blood differed between healthy people and people who were susceptible to constriction of blood vessels and reduced blood flow (i.
Organisms having both enzymes should be able to drive the entire citric acid cycle reductively; with only one of the two, they might be able to drive part of the reductive cycle.
In the next step, the ions catalyzed the addition of a carbon molecule to the acetic acid to get three-carbon pyruvic acid, which is another key chemical in the citric acid cycle and also reacts with ammonia to form amino acids, which themselves link up to form proteins.
More specifically, you can thank the citric acid cycle, or, the Krebs cycle (as my inner biology student somehow remembers it), for this energy expenditure.