Gossypol as a male antifertility agent - why studies should have been continued

P-9: Investigate The Effects of Polyphenol Gossypol as A Male Antifertility Agents,How to Make Male Contraceptive?

Background: Gossypol is a polyphenol isolated from the cotton plant (Gossypium sp.). The substance, shows promise for use as a male contraceptive, is a derivative of cottonseed oil. Various species of animals have been tested and some are more sensitive than others, and in men it causes spermatogenesis arrest at relatively low doses. Materials and Methods: This routine data base study re-examin...

Why Should We Have a Periodic Safety and Performance Program for Medical Devices

Nowadays, more than 10,000 different types of medical devices can be found in hospitals.These devices used in medical centers and hospitals for monitoring and treatment of patients require periodic safety and performance checking in order to have confidence in their functioning and operation. Physicians need better accurate medical measurements in order to better diagnose diseases, monitor pati...

Why have Pneumocystis carinii trophozoites been ignored?

Should There Have Been a Polis in Aristotle’s Poetics?

Why should trees have natural root grafts?

Natural root grafts occur in many tree species, but this widespread phenomenon has received only little attention. For many years, physiological aspects such as transfer of organic materials, water and minerals were considered their major significance. Better anchorage in flooded areas or in windy habitats was also proposed to select for this character. I propose that root grafts provide severa...