41. One common approach to the arm-first synthesis is through anionic polymerization methods. 42. Substrates for OST transporters include a variety of organic compounds, most being anionic . 43. Polynuclear anionic species also exist, such as the dark brown, and the black. 44. Depending on the catalyst type, the mechanism of polymerization can be cationic or anionic . 45. Soil, consisting of polyanionic clays and silicates, generally has a net anionic charge. 46. SH " is a soft anionic ligand that forms complexes with most metal ions. 47. During turnover, the neutral and anionic semiquinones are observed which indicates a radical mechanism. 48. Nucleic acids are anionic , the corresponding cations are often protonated polyamines .--> 49. Sodium polyacrylate is an anionic polyelectrolyte with negatively charged carboxylic groups in the main chain. 50. Deprotonation of HNacNac compounds affords anionic bidentate ligands that form a variety of coordination complexes.