(1) The list includes sodium, potassium, calcium, magnesium, manganese , iron, cobalt, copper, zinc, and molybdenum.(2) The oxygens which were originally attached to the manganese are still attached in the neutral complex.(3) Unlike metals such as iron, copper, magnesium, manganese , and nickel, gold has no natural biological role.(4) Carbon-manganese steels are in general use for the rails; too much carbon makes the steel brittle, too much manganese makes it hard to weld.(5) Cobalt, nickel and manganese are metals with iron-like properties.(6) And it provided vital information on lime requirement, phosphorus, potash, magnesium, copper, manganese and zinc.(7) They include magnesium, calcium, iron, sulfur, molybdenum, boron, zinc, copper and manganese .(8) By far the most important use of manganese is in the production of alloys, primarily steel alloys.(9) These changes were associated with large increases in phosphorus, potassium, zinc, iron, manganese , and copper.(10) Also, urinalysis showed high levels of potassium, manganese , and calcium.(11) Uptake of aluminum, iron and manganese has not been as extensively studied in algae.(12) These alloys usually contain manganese as an impurity because wrought metal scrap is used in preparing them.(13) Groundwater also contains salts of calcium, magnesium, iron, and manganese .(14) Most Nebraska soils contain sufficient levels of potassium, magnesium, manganese , iron and sulfur for sunflower levels.(15) The mineral elements most likely to be deficient in vineyards are nitrogen, potassium, phosphorus, zinc, boron, iron, manganese , and magnesium.(16) Nitrates and trace metals, such as iron, manganese , copper, and zinc, should be kept to a minimum.