NAD / NADH definition
Nicotinamide adenine dinucleotide (NAD) is a coenzyme found in all living cells. The compound is a dinucleotide, because it consists of two nucleotides joined through their phosphate groups.One nucleotide contains an adenine base and the other nicotinamide. Nicotinamide adenine dinucleotide exists in two forms, an oxidized and reduced form abbreviated as NAD+ and NADH respectively.icotinamide adenine dinucleotide, like all dinucleotide s, consists of two nucleotides joined by a pair of bridging phosphate groups. The nucleotides consist of ribose rings, one with adenine attached to the first carbon atom (the 1' position) and the other with nicotinamide at this position. In metabolism, nicotinamide adenine dinucleotide is involved in redox reactions, carrying electrons from one reaction to another. The coenzyme is, therefore, found in two forms in cells: NAD + is an oxidizing agent – it accepts electrons from other molecules and becomes reduced.This reaction forms NADH, which can then be used as a reducing agent to donate electrons. These electron transfer reactions are the main function of NAD.icotinamide adenine dinucleotide, like all dinucleotide s, consists of two nucleotides joined by a pair of bridging phosphate groups. The nucleotides consist of ribose rings, one with adenine attached to the first carbon atom (the 1' position) and the other with nicotinamide at this position. FADH2 and NADH Defined. Flavin adenine dinucleotide, or FADH2, is a redox cofactor that is created during the Krebs cycle and utilized during the last part of respiration (the electron transport chain).Nicotinamide adenine dinucleotide, or NADH, is a similar compound and used more actively in the electron transport chain as well.In fact, more NADH is produced and used than FADH2 in the process of creating energy. There are actually 6 NADH produced and only 2 FADH2 molecules.asically, the NADH and FADH2 molecules are affixed with electrons and are transferred to the inner membrane of the mitochondria. They travel down the electron transport chain, releasing the electrons that they once had. NADH. the reduced form of nicotinamide-adenine dinucleotide. NADH-methemoglobin reductase. the enzyme in the erythrocyte that converts methemoglobin to hemoglobin, which is the form responsible for the transport of oxygen.1  Facebook.ADH. the reduced form of nicotinamide-adenine dinucleotide. NADH-methemoglobin reductase. the enzyme in the erythrocyte that converts methemoglobin to hemoglobin, which is the form responsible for the transport of oxygen. 1  Facebook. Medical Definition of NADH. : the reduced form of NAD.ADVERTISEMENT.een & Heard. What made you want to look up NADH? Please tell us where you read or heard it (including the quote, if possible). View Seen & Heard Highlights from Around the Site. NADH, short for nicotinamide adenine dinucleotide, is an important pyridine nucleotide that functions as an oxidative cofactor in eukaryotic cells.NADH plays a key role in the production of energy through redox reactions.ecause of the positive charge on the nitrogen atom in the nicotinamide ring, the oxidized form of this important redox reagent is often depicted as NAD+. In cells, most oxidations are accomplished by the removal of hydrogen atoms. NAD coenzyme plays a crucial role in this. NAD. n. 1. (Biochemistry) biochem nicotinamide adenine dinucleotide; a coenzyme that is a hydrogen carrier in metabolic reactions, esp in tissue respiration.AD-a coenzyme present in most living cells and derived from the B vitamin nicotinic acid; serves as a reductant in various metabolic processes. nicotinamide adenine dinucleotide. coenzyme-a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes. 1  Facebook. FADH2 and NADH are created from FAD and NAD+ through redox (reduction-oxidation) reactions in the Krebs cycle during respiration as seen below here: This cycle gives off small amounts of energy in the form of ATP (adenonsine triphosphate, cell energy) and produces these compounds, FADH2 and NADH.asically, the NADH and FADH2 molecules are affixed with electrons and are transferred to the inner membrane of the mitochondria. They travel down the electron transport chain, releasing the electrons that they once had. Nicotinamide adenine dinucleotide, like all dinucleotide s, consists of two nucleotides joined by a pair of bridging phosphate groups. The nucleotides consist of ribose rings, one with adenine attached to the first carbon atom (the 1' position) and the other with nicotinamide at this position.icotinamide adenine dinucleotide, like all dinucleotide s, consists of two nucleotides joined by a pair of bridging phosphate groups. The nucleotides consist of ribose rings, one with adenine attached to the first carbon atom (the 1' position) and the other with nicotinamide at this position. NADH. n. 1. (Biochemistry) biochem the chemically reduced form of NAD.ADH. n. 1. (Biochemistry) biochem the chemically reduced form of NAD.
Nicotinamide adenine dinucleotide (NAD) is a coenzyme found in all living cells. Nicotinamide adenine dinucleotide exists in two forms, an oxidized and reduced form abbreviated as NAD+ and NADH respectively.