Sentence:  Some 80 reaction tubes from 13 manifold fillings were illuminated in the <WSD>temperature</WSD> 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:  the degree of hotness or coldness of a body or environment (corresponding to its molecular activity)