84 



weed control and fostered the establishment of the agricultural chemical indus- 

 try. 



Developed coupling of the flame ionization detector with a sensitive electrome- 

 ter for the measurement of the plant hormone ethylene. This enabled plant sci- 

 entists to measure low amounts of ethylene, and led to the means of controlling 

 the amoimt of fruit-ripening ethylene in storage rooms. 



Discovered a class of plant growth regulating substances known as brassinolides. 

 These compounds are steriodal in nature and function with other hormones in 

 accelerating plant development and maturation. 



