fe is the chemical symbol for carbon.
fe is the chemical symbol for carbon.
fe is the chemical symbol for what element?
carbon
the femo cofactor is a cluster with composition femosc. fe is the chemical symbol for the element iron (ferrum), and mo is the symbol for molybdenum. this large cluster can be viewed as two subunits composed of one fes (iron(iii) sulfide) cluster and one mofes cluster. the two clusters are linked by three sulfide ligands. the unique iron (fe) is anchored to the protein by a cysteine. it is also bound to three sulfides, resulting in tetrahedral molecular geometry. the additional six fe centers in the cluster are each bonded to three sulfides. these six internal fe centers define a trigonal prismatic arrangement around a central carbide center. the molybdenum is attached to three sulfides and is anchored to the protein by the imidazole group of a histidine residue. also bound to mo is a bidentate homocitrate cofactor, leading to octahedral geometry. crystallographic analysis of the mofe protein initially proposed the geometry of femoco, which was confirmed by extended x-ray absorption fine-structure (exafs) studies. distances for fe-s, fe-fe and fe-mo distances were determined to be 2.32, 2.64, and 2.73 å respectively.
femoco
an isotope and/or nuclide is specified by the name of the particular element (this indicates the atomic number) followed by a hyphen and the mass number (e.g. helium-3, helium-4, carbon-12, carbon-14, uranium-235 and uranium-239). when a chemical symbol is used, e.g. "c" for carbon, standard notation (now known as "aze notation" because "a" is the mass number, "z" the atomic number, and e for element) is to indicate the mass number (number of nucleons) with a superscript at the upper left of the chemical symbol and to indicate the atomic number with a subscript at the lower left (e.g. , , , , , and ). because the atomic number is given by the element symbol, it is common to state only the mass number in the superscript and leave out the atomic number subscript (e.g. , , , , , and ). the letter "m" is sometimes appended after the mass number to indicate a nuclear isomer, a metastable or energetically-excited nuclear state (as opposed to the lowest-energy ground state), for example (tantalum-180m).
isotope