Fertilization in Ephedra altissima

Pollen and Pollination in Ephedra (gnetales)

Moonlight pollination in the gymnosperm Ephedra (Gnetales).

Most gymnosperms are wind-pollinated, but some are insect-pollinated, and in Ephedra (Gnetales), both wind pollination and insect pollination occur. Little is, however, known about mechanisms and evolution of pollination syndromes in gymnosperms. Based on four seasons of field studies, we show an unexpected correlation between pollination and the phases of the moon in one of our studied species...

Ephedra-Induced Gastric Mucosal Injury

In this case report we detail the difficult case of a 74-year-old male patient who was transferred to our cardiac intensive care unit in severe shock with an acute abdomen. His abdomen was emergently explored revealing isolated gastric necrosis and ischemia. A subtotal gastrectomy was performed and the patient was discharged from the hospital 34 days after surgery. Postoperatively we learned th...

Chemical composition of various Ephedra species.

The medicinal significance of Ephedra is based on the sympathomimetic properties of ephedrine (E) alkaloids. Pharmacological effects depend on the phytocomposition of individual Ephedra species. The aim of this study was to measure the total alkaloids content (TAC), total phenolics content (TPC), and total flavonoids content (TFC) and determine their relationship in dry herb of Ephedra major, E...

مقایسه ویژگی های آناتومیکی چوب سه گونه از افدراهای ایران (Ephedra procera و Ephedra strobilacea ،Ephedra intermedia)

ارمک­ها (ریش­بز) یا افدراها ازجمله گونه­های بومی رویشگاه ایران و تورانی هستند که تاکنون ویژگی­های آناتومیکی و فیزیکی آنها مورد مطالعه قرار نگرفته است. بدین منظور چوب تنه سه گونه ارمک میانه (Ephedra intermedia)، ارمک ریش بز (Ephedra major) و ارمک بیابانی یا ارمک آسیای مرکزی (Ephedra strobilaceae Bge.) از مناطق کویری استان یزد جمع­آوری و ویژگی­های آناتومیکی و فیزیکی آن مورد مطالعه قرار گرفت. نتای...