An adult patient with thyrotoxicosis had erythrocyte carbonic anhydrase deficiency and an abnormally high level of fetal hemoglobin. Oxygen partial pressure at the 50% saturation of Hb (P 50) in human blood was measured as CA activity was inhibited to varying degrees with acetazolamide (AZ; 100 and 200 μg/mL).Transient but significant change in P 50 was observed when AZ was administered and the CO … These results indicate that carbonic anhydrase might play a role in mercury toxicity. Once this compound is formed, it dissociates into HCO 3-and H +, which increases the acidity of the environment and lowers the pH level. Next to hemoglobin, carbonic anhydrase is the most abundant protein to be found in human erythrocytes. Red cell carbonic anhydrase B and C isozymes and hemoglobin F were studied by the single radial immunodiffusion technique in lead workers exposed to low concentrations of lead. Most of them were already under … DAVENPORT EARLY DAYS OF CARBONIC ANHYDRASE RESEARCH 7 In the early 1930s, those who thought hemoglobin catalyzes the hydration and dehydration of carbon dioxide prepared their hemoglobin by Adair's method. Twelve other patients with hyperthyroidism and not related to this index case were studied. The lead contents, δ-aminolevulinic acid dehydrase and glutathione levels were simultaneously determined. 2564 Proton Transfer between Hemoglobin and Carbonic Anhydrase each passage the eluant was collected and the column was reacti- vated with a solution of 0.4 M NaN,. Carbonic anhydrase B, glutathione and δ-aminolevulinic acid dehydrase activity in lead-exposed … Carbaminohemoglobin (or carbaminohaemoglobin, also known as carbhemoglobin and carbohemoglobin) is a compound of hemoglobin and carbon dioxide, and is one of the forms in which carbon dioxide exists in the blood.Twenty-three percent of carbon dioxide is carried in blood this way (70% is converted into bicarbonate by carbonic anhydrase and then carried in plasma, 7% carried as … Due to an enzymatic digest of the protein-mercury adduct, the binding site at the free thiol group of the protein was identified. Beside adduct formation of mercury species with hemoglobin, the main compound of the erythrocytes, mercury binding to the enzyme carbonic anhydrase was revealed. We studied the effect on hemoglobin (Hb)–oxygen affinity induced by changes in carbonic anhydrase (CA) activity. The ability of human carbonic anhydrases to interact with human CO‐hemoglobin have been studied with the counter‐current distribution technique in aqueous/aqueous biphasic systems. Carbon dioxide also stimulates oxygen release in the hemoglobin. Following this procedure the molar ratio of hemoglobin to carbonic anhydrase was 3 x 105. Carbonic anhydrase takes carbon dioxide diffused from the tissue into the red blood cell and water to yield carbonic acid (H 2 CO 3), which is a strong acid (pKa 3.5). Gilbert Adair had proved that purified hemoglobin is a … 2) Bovine red cell hemolysate was passed through a column of DEAE- Sephadex following the procedure of Williams and Tsay (9). After treatment of the hyperthyroidism, the erythrocyte carbonic anhydrase level became normal and the level of Hb F dropped.