Science / Chemistry / Activated Complex: Transition state. An intermediate structure formed in the conversion of reactants to products. The activated complex is the structure at the maximum energy point along the reaction path; the activation energy is the difference between the energies of the activated complex and the reactants.
Science / Chemistry / High Spin Complex: A metal-ligand complex with the same number of unpaired electrons as the uncomplexed metal ion. When a weak ligand complexes the metal ion, the crystal field splitting is small and the electrons can s MORE
Science / Biology / Golgi Complex: Organelles in animal cells composed of a series of fiattened sacs that sort, chemically modify, and package proteins produced on the rough endoplasmic reticulum. MORE
Science / Chemistry / Complexometric Titration: A titration based on a reaction between a ligand and a metal ion to form a complex. For example, free Ca2+ in milk powder can be determined by titrating a milk powder sample with EDTA solution, which MORE
Science / Chemistry / Low Spin Complex: A metal-ligand complex with fewer unpaired electrons than the uncomplexed metal ion. When a strong ligand complexes the metal ion, the crystal field splitting is large and some electrons pair rather t MORE
Science / Biology / Membrane-Attack Complex (MAC): A large cylindrical multiprotein complex formed by the complement system; kills invading microorganisms by embedding in their plasma membrane, creating a pore through which fiuid fiows, ultimately cau MORE