passages.id: split_4_test_391_passage
passages.type: progene_text
passages.text: A van ' t Hoff plot of the change in Kd was linear between 10 and 37 degrees C and yielded values of DeltaH degrees = - 12.9 kcal / mol and DeltaS degrees = - 15.9 cal mol - 1 deg-1 , suggesting that electrostatic forces play a prominent role in the interaction of C8 with C9 .