The U.S. infant mortality rate generally declined throughout the 20th century, from 100 infant deaths per 1,000 live births in 1900 to 6.89 infant deaths per 1,000 live births in 2000.
hemoglobinopathies are genetic inherited disorders of hemoglobin the oxygen carrying protein of the red blood cells the hemoglobin molecule is composed of four separate polypeptide chains of amino acids two alpha chains and two beta chains as well as four iron bearing heme groups that bind oxygenemoglobinopathies are genetic inherited disorders of hemoglobin the oxygen carrying protein of the red blood cells the hemoglobin molecule is composed of four separate polypeptide chains of amino acids two alpha chains and two beta chains as well as four iron bearing heme groups that bind oxygen
Methemoglobinemia, beta-globin type is a condition that affects the function of red blood cells.Specifically, it alters a molecule called hemoglobin within these cells.emoglobin that contains ferric iron is known as methemoglobin. HBB gene mutations that cause methemoglobinemia, beta-globin type change the structure of beta-globin and promote the heme iron to change from ferrous to ferric.