Sentence:  Some 80 reaction <WSD>tubes</WSD> from 13 manifold fillings were illuminated in the temperature range from 40 to 85 ` in a further endeavor to determine the cause of the irreproducibility and to obtain information on the activation energy and the effect of light intensity . 
Meaning of the word marked with <WSD> tags:  conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases