[Photo: Maggie Hoffman] A fifth of all of the wine grapes planted in Germany are riesling, so to talk about German wine, you have to start with this iconic grape. There's a lot to love: Riesling can taste like peach or apricot, with a bolt of lime-like tartness. It's also incredibly aromatic, all jasmine and honeysuckle.
Hemoglobin is responsible for transporting oxygen from lungs to other parts of the body, where the oxygen can be used by other cells. Oxy-hemoglobin (HbO2) is the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs.A hemoglobin molecule can carry a maximum of four oxygen molecules.emoglobin is responsible for transporting oxygen from lungs to other parts of the body, where the oxygen can be used by other cells. Oxy-hemoglobin (HbO2) is the bright red hemoglobin that is a combination of hemoglobin and oxygen from the lungs. A hemoglobin molecule can carry a maximum of four oxygen molecules.
Methemoglobin is a form of the oxygen-carrying metalloprotein hemoglobin, in which the iron in the heme group is in the Fe3+ state, not the Fe2+ of normal hemoglobin. Methemoglobin cannot bind oxygen, unlike oxyhemoglobin. It is bluish chocolate-brown in color. In human blood a trace amount of methemoglobin is normally produced spontaneously, but when present in excess the blood becomes abnormally dark bluish brown. The NADH-dependent enzyme methemoglobin reductase is responsible for converting