Anthocyanins as Functional Food Colors Flavonoids in Sophora Species Quantitative Structure Cytotoxicity Relationship of Bioactive Heterocycles by the Semi-empirical Molecular Orbital Method with the Concept of Absolute Hardness The Chemistry of Bioactive Mesoionic Heterocycles Bioactive Phenothiazines and Benzo[a]phenothiazines: Spectroscopic Studies, and Biological and Biomedical Properties and Applications