Distribution and Accumulating Regularity of Secondary Metabolites in Helianthus annuus L. Chemical constituents from seeds of Helianthus annuus The Ultracytochemical Localization of ATPase Activity in the Ovules of Sunflower An Ultrastructural Study on the In Vitro Parthenogenesis in Sunflower Uptake and Distribution of 133Cs and 88Sr in sunflower(Helianthus annuus L.) Study on antimicrobial assay of root extract of allelopathic Helianthus annuus