Amyloid beta-Protein Precursor/metabolism; Convolvulus; Drugs, Chinese Herbal/pharmacology; Medicine, Ayurvedic; Medicine, Chinese Traditional; Memory/drug effects; Neurons/drug effects; Nootropic Agents/pharmacology; Polygonum; Withania; Amyloid beta-Peptides/metabolism; Amyloid beta-Protein Precursor/genetics; Animals; Blotting, Western; Cell Line, Tumor; Cell Survival/drug effects; Convolvulus/chemistry; Dose-Response Relationship, Drug; Drugs, Chinese Herbal/isolation & purification; Drugs, Chinese Herbal/toxicity; Enzyme-Linked Immunosorbent Assay; Ethanol/chemistry; Mice; Mutation; Neurons/metabolism; Nootropic Agents/isolation & purification; Nootropic Agents/toxicity; Plant Leaves; Plant Roots; Plants, Medicinal; Polygonum/chemistry; Protein Processing, Post-Translational; Solvents/chemistry; Transfection; Withania/chemistry