See renowned defined for English-language learners. See renowned defined for kids. Poggio prospected for manuscripts across much of western Europe, visiting the renowned monasteries of Reichenau and Fulda, and wandering as far afield as Cologne, London, Paris, and Rome. âFred Lerner, The Story of Libraries, 1998.
The citric acid cycle, also known as the Krebs cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions in the cell that breaks down food molecules into carbon dioxide, water, and energy. In plants and animals, these reactions take place in the mitochondria of the cell as part of cellular respiration.
Though the Krebs cycle does not directly require oxygen, it can only take place when oxygen is present because it relies on by-products from the electron transport chain, which requires oxygen. The Krebs cycle is therefore an aerobic process.