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Manganese is a chemical element; it has symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels.
Manganese is an essential human dietary element. It is present as a coenzyme in several biological processes, which include macronutrient metabolism, bone formation, and free radical defense systems. It is a critical component in dozens of proteins and enzymes. [3]
Manganese dioxide is the inorganic compound with the formula MnO. 2. This blackish or brown solid occurs naturally as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules. The principal use for MnO.
Naturally occurring manganese ( 25 Mn) is composed of one stable isotope, 55 Mn. Twenty-seven radioisotopes have been characterized, with the most stable being 53 Mn with a half-life of 3.7 million years, 54 Mn with a half-life of 312.3 days, and 52 Mn with a half-life of 5.591 days. All of the remaining radioactive isotopes have half-lives ...
Manganese is a heavy metal that comprises about 0.1% of the Earth's crust and a necessary element for biological processes. It is cycled through the Earth in similar ways to iron, but with distinct redox pathways. Human activities have impacted the fluxes of manganese among the different spheres of the Earth.
Ferromanganese nodules are mineral concretions composed of silicates and insoluble iron and manganese oxides that form on the ocean seafloor and terrestrial soils. The formation mechanism involves a series of redox oscillations driven by both abiotic and biotic processes. [ 2 ]
Manganese oxide. Manganese oxide is any of a variety of manganese oxides and hydroxides. [1] These include. Manganese (II) oxide, MnO. Manganese (II,III) oxide, Mn 3 O 4. Manganese (III) oxide, Mn 2 O 3. Manganese dioxide, MnO 2.
Manganism. - biochemical blood test: determination of the activity of ALT, ACT, LDH, creatine phosphokinase (CPK); - indicators of protein metabolism, - concentrations of thyroid hormones.Instrumental research. EEG, CT, MRI, global EMG, ENMG data are evaluated. Manganism or manganese poisoning is a toxic condition resulting from chronic ...