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The citric acid cycle—also known as the Krebs cycle, Szent–Györgyi–Krebs cycle or the TCA cycle (tricarboxylic acid cycle)—is a series of biochemical reactions to release the energy stored in nutrients through the oxidation of acetyl-CoA derived from carbohydrates, fats, proteins, and alcohol. The chemical energy released is available in the form of ATP. The Krebs cycle is used by organisms that respire (as opposed to organisms that ferment) to generate energy, either by anaerobic respiration or aerobic respiration. In addition, the cycle provides precursors of certain amino acids, as well as the reducing agent NADH, that are used in numerous other reactions. Its central importance to many biochemical pathways suggests that it was one of the earliest components of metabolism. Even though it is branded as a "cycle", it is not necessary for metabolites to follow only one specific route; at least three alternative segments of the citric acid cycle have been recognized.
Cellular respiration is the process by which biological fuels are oxidized in the presence of an inorganic electron acceptor, such as oxygen, to drive the bulk production of adenosine triphosphate (ATP), which contains energy. Cellular respiration may be described as a set of metabolic reactions and processes that take place in the cells of organisms to convert chemical energy from nutrients into ATP, and then release waste products.
Acetyl-CoA is a molecule that participates in many biochemical reactions in protein, carbohydrate and lipid metabolism. Its main function is to deliver the acetyl group to the citric acid cycle to be oxidized for energy production.
A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li+ ions into electronically conducting solids to store energy. In comparison with other commercial rechargeable batteries, Li-ion batteries are characterized by higher specific energy, higher energy density, higher energy efficiency, a longer cycle life, and a longer calendar life. Also noteworthy is a dramatic improvement in lithium-ion battery properties after their market introduction in 1991: over the following 30 years, their volumetric energy density increased threefold while their cost dropped tenfold.
Life cycle assessment (LCA), also known as life cycle analysis, is a methodology for assessing environmental impacts associated with all the stages of the life cycle of a commercial product, process, or service. For instance, in the case of a manufactured product, environmental impacts are assessed from raw material extraction and processing (cradle), through the product's manufacture, distribution and use, to the recycling or final disposal of the materials composing it (grave).
Biological carbon fixation, or сarbon assimilation, is the process by which living organisms convert inorganic carbon to organic compounds. These organic compounds are then used to store energy and as structures for other biomolecules. Carbon is primarily fixed through photosynthesis, but some organisms use chemosynthesis in the absence of sunlight. Chemosynthesis is carbon fixation driven by chemical energy rather than from sunlight.
U.S. Postal Service Pro Cycling Team was a United States–based professional road bicycle racing team. On June 15, 2004, the Discovery Channel signed a deal to become sponsor of the team for the 2004–2007 seasons and its name changed to Discovery Channel Pro Cycling Team. From 2005 until 2007, the team was one of the 20 teams that competed in the new UCI ProTour. As part of the sponsorship deal, Lance Armstrong, the team's undisputed leader, provided on-air appearances for the Discovery Networks TV channels. The deal did not affect the rights of secondary sponsor OLN, later known as NBCSN in the US, to air major cycling events such as the Tour de France, although the two channels are competitors.
Cycle sport is competitive physical activity using bicycles. There are several categories of bicycle racing including road bicycle racing, cyclo-cross, mountain bike racing, track cycling, BMX, and cycle speedway. Non-racing cycling sports include artistic cycling, cycle polo, freestyle BMX, mountain bike trials, hardcourt bike polo and cycleball. The Union Cycliste Internationale (UCI) is the world governing body for cycling and international competitive cycling events. The International Human Powered Vehicle Association is the governing body for human-powered vehicles that imposes far fewer restrictions on their design than does the UCI. The UltraMarathon Cycling Association is the governing body for many ultra-distance cycling races.
The Calvin cycle, light-independent reactions, bio synthetic phase, dark reactions, or photosynthetic carbon reduction (PCR) cycle of photosynthesis is a series of chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose. The Calvin cycle is present in all photosynthetic eukaryotes and also many photosynthetic bacteria. In plants, these reactions occur in the stroma, the fluid-filled region of a chloroplast outside the thylakoid membranes. These reactions take the products of light-dependent reactions and perform further chemical processes on them. The Calvin cycle uses the chemical energy of ATP and reducing power of NADPH from the light dependent reactions to produce sugars for the plant to use. These substrates are used in a series of reduction-oxidation (redox) reactions to produce sugars in a step-wise process; there is no direct reaction that converts several molecules of CO2 to a sugar. There are three phases to the light-independent reactions, collectively called the Calvin cycle: carboxylation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration.
Oxaloacetic acid (also known as oxalacetic acid or OAA) is a crystalline organic compound with the chemical formula HO2CC(O)CH2CO2H. Oxaloacetic acid, in the form of its conjugate base oxaloacetate, is a metabolic intermediate in many processes that occur in animals. It takes part in gluconeogenesis, the urea cycle, the glyoxylate cycle, amino acid synthesis, fatty acid synthesis and the citric acid cycle.
In biochemistry and metabolism, beta oxidation (also β-oxidation) is the catabolic process by which fatty acid molecules are broken down in the cytosol in prokaryotes and in the mitochondria in eukaryotes to generate acetyl-CoA. Acetyl-CoA enters the citric acid cycle, generating NADH and FADH2, which are electron carriers used in the electron transport chain. It is named as such because the beta carbon of the fatty acid chain undergoes oxidation and is converted to a carbonyl group to start the cycle all over again. Beta-oxidation is primarily facilitated by the mitochondrial trifunctional protein, an enzyme complex associated with the inner mitochondrial membrane, although very long chain fatty acids are oxidized in peroxisomes.
Halfords Group PLC is a UK retailer of motoring and cycling products and services. Through Halfords Autocentre, they provide vehicle servicing, MOT, maintenance and repairs in the United Kingdom.
Cycling New Zealand, originally known as BikeNZ, is the national governing body for cycling organisations in New Zealand, and represents the interests of BMX NZ, Cycling New Zealand Road & Track, Mountain Bike NZ, and Cycling New Zealand Schools. Cycling New Zealand covers the disciplines of road, track, mountain bike, cyclo-cross, BMX, BMX freestyle, e-cycling sports, para-cycling, and recreational and commuter riding.
Shane William Archbold is a New Zealand former professional racing cyclist who competed as a professional from 2012 to 2023.
Alison Shanks is a retired New Zealand professional racing cyclist, specialising in the individual pursuit and team pursuit in track cycling and individual time trial in road bicycle racing. Prior to that she was an Otago Rebels netballer, the sport she played for more than five years before her cycling career.
The Asian Cycling Championships is an annual continental cycling championships for road bicycle racing and track cycling since 1963, exclusively for Asian cyclists selected by the national governing body.
Cyclingnews.com is a website providing cycling news, race results, bike-related reviews and buying advice owned by Future.
Catherine Cheatley is a retired New Zealand professional road and track cyclist. She won two New Zealand championship titles in both road race and individual track pursuit, and later represented her nation New Zealand at the 2008 Summer Olympics. Before her official retirement in June 2012 because of sustained bike crash-related injuries, Cheatley moved to the United States to race for the Cheerwine and Colavita–Sutter Home pro cycling teams in the women's elite professional events on the UCI Women's World Cup, and UCI World Championships, where she earned the bronze medal for the women's points race in 2007.
Olivia Rose Podmore was a New Zealand professional racing cyclist. She represented her country at the 2016 Summer Olympics and the 2018 Commonwealth Games.
References
- ↑ "Co Hoogedoorn". Cycling Archives. Retrieved 29 February 2016.
