86 ANTIBODIES, IMMUNITY, WASSERMANN SERUM TEST 



27. What are the names given to the free side-chains contained in the blood 

 serum? What is their relation to toxins liberated in the body of an infected 

 animal? 



28. What is a toxoid ? Under what conditions is it formed ? 



29. What is a hemolysin? Is it a simple or a compound antibody? What 

 enters into its formation? 



30. What is the meaning of thermolabile and thermostabile ? What does 

 inactivating mean ? 



31. What is an amboceptor? Why so named? 



32. How can a previously inactivated serum be reactivated ? 



33. What is a complete hemolytic system or chain? 



34. How can the hemolytic complement be deviated or fixed ? 



35. How can a rabbit be sensitized so that its blood serum will bring about 

 hemolysis of sheep's corpuscles? 



36. Describe the method of washing sheep's corpuscles. 



37. How is the hemolytic complement for tests in hemolysis generally obtained ? 



38. How must this complement, which is easily destroyed, be preserved ? 



39. Describe the method of inactivating sensitized rabbit's serum. 



40. How are the clear sera from animals or man obtained? How are they 

 treated before use ? 



41. In what proportions and dilutions are the reagents in a test for complement 

 deviation used? 



42. How is the antigen extract in Wassermann's serum test for syphilis 

 prepared ? 



43. Describe in detail the steps of the Wassermann test. 



