Introduction
Introduction
“In All things there is a poison, and there is nothing without a poison. It depends on only upon the dose whether a poison is a poison or not”---------Paracelsus (1493?-1541,
Switzerland)
Chinese saying “Shi Yao San Fei Du” means
“Any drugs have toxic effects”.
Introduction: Why Study Medicinal Plants
Medicinal plants and religions
• Medicinal plants have played an essential
role in the development of human culture, for example religions and different ceremonies.
(e.g. Dutura has long been associated with the worship of Shiva, the Indian god).
Introduction: Why Study Medicinal Plants
Statue of Kuan Yin on Mount
Putuo near Shanghai, China
Nelumbo nucifera, common name: blue lotus
Introduction: Why Study Medicinal Plants
Significances of Medicinal Plants to Human Being
• Many of the modern medicines are produced indirectly from medicinal plants, for example aspirin.
• Plants are directly used as medicines by a majority of cultures around the world, for example Chinese medicine and Indian medicine.
• Many food crops have medicinal effects, for example garlic. Introduction: Why Study Medicinal Plants
4. Medicinal plants are resources of new drugs. It is estimated there are more than 250, 000 flower plant species. 5. Studying medicinal plants helps to understand plant toxicity and protect human and animals from natural poisons. 6. Cultivation and preservation of medicinal plants protect biological diversity, for example metabolic engineering of plants.
Introduction: Why Study Medicinal Plants
Plant resources for new medicine
Bryophytes (nonvascular plants, e.g. liverwort and moss) have about 15,350 species.
Seedless vascular plants (commonly called fern) are estimated about 12, 157 species
Gymnosperm has about 760 species.
Angiosperm is estimated to have more than 250,000 species. Introduction: Why Study Medicinal Plants
Bryophytes (nonvascular