Hemoglobin is the main component of red blood cells and serves as the transporter for oxygen and carbon dioxide in the blood. Hemoglobin concentration (Hb) is usually reported as grams of hemoglobin per deciliter of blood (g/dL). Hb is commonly measured by the cyanhemoglobin (hemoglobin cyanide) method. A sample of blood is diluted in a solution of potassium ferricyanide and potassium cyanide, which oxidizes hemoglobin to hemiglobin (Hi; methemoglobin) and then converts it to hemoglobin cyanide (HiCN). The concentration of HiCN is then measured by spectrophotometry.
Method. Preheat oven to 200oC. Wipe roast with damp paper towels. Combine flour, mustard, salt and pepper in a small bowl and rub all over beef. Place the roast, fat side up in a roasting pan and roast, uncovered, for 30-40 minutes for a rare roast or 40-50 minutes for a medium roast.Once cooked, cover with foil and let stand for 15-20 minutes for easier carving. Reserve the cooking juices to make a gravy or jus, if desired.ombine flour, mustard, salt and pepper in a small bowl and rub all over beef. Place the roast, fat side up in a roasting pan and roast, uncovered, for 30-40 minutes for a rare roast or 40-50 minutes for a medium roast. Once cooked, cover with foil and let stand for 15-20 minutes for easier carving.
Oven sear the ribs for 15 minutes or until golden brown, then drop the heat to 225 F. Slide out the oven rack out and pour about 1 inch of stock or water in the pan. Cover the pan with a lid or heavy-duty aluminum foil and return it to the oven.Rotate the pan 180 degrees in the oven every 30 minutes, and add water as needed to keep it about 3/4- to 1-inch deep. Slow cook the rib roast until tender, about 2 1/2 hours. Take the pork roast out of the oven and serve immediately.ven sear the ribs for 15 minutes or until golden brown, then drop the heat to 225 F. Slide out the oven rack out and pour about 1 inch of stock or water in the pan. Cover the pan with a lid or heavy-duty aluminum foil and return it to the oven.