60 H. O. HALVORSON 



J. F. Powell, Spores, Proc. A Her ton Spore Conference, Publ. No. 5, 



A.I.B.S., Washington, D.C., 1956, p. 72. 

 6 J. F. Powell and R. E. Strange, Biocheni. J., 58 (1954) 80. 

 ' Z. J. Ordal, personal communication. 



8 E. S. Wynne, Bacteriol. Rev., 21 (1957) 259. 



9 J. W. Foster, Dipicolinic Acid and Bacterial Spores, Lecture given at the 

 University of Maryland. Sponsored by American Cyanamid Co., Chas. 

 Pfizer and Sons, and Merck and Co., 1959. 



1" H. O. Halvorson, The Physiology of the Bacterial 5'/70/£', Technical Uni- 

 versity of Norway, A.S. Reklametrykk, Trondheim, 1958. 



^^ K. G. Gollakota, Unpublished data. 



1- G. G. K. MuRTY AND H. O. Halvorson, /. Bacteriol., 73 (1957) 230. 



1^ W. L. Brown, Thesis, University of Illinois, Urbana, 111., 1956, 



1-1 G. M. Hills, J. Gen. Microbiol., 4 (1950) 38. 



1^ N. L. Lawrence, J. Bacteriol., 70 (1955) 577. 



^^ H. M. Nakata, Thesis, University of Illinois, Urbana, 111., 1956. 



^' H. S. Levinson, Spores, Proc. Allerton Spore Conference, Publ. No. 5, 

 A.I.B.S., Washington, D.C., 1957, p. 120. 



1* B. D. Church and H. Halvorson, Bacteriol. Proc. (Soc. Am. Bacteriol.), 

 (1955)41. 



^^ A. Lund, Personal communication. 



■^0 R. Collier, Thesis, University of Illinois, Urbana, 111., 1958. 



"'1 H. M. Nakata, Thesis, University of Illinois, Urbana, III., 1959. 



-^ K. G. Gollakota and H. O. Halvorson, J. Bacteriol., 79 (I960) 1. 



-3 H. H. Martin and J. W. Foster, /. Bacteriol.. 76 (1958) 167. 



-^ H. RiEMANN, personal communication. 



DISCUSSION 



Kindler: Foster has claimed that diaminopimelic acid is a 

 precursor of dipicoHnic acid. I wonder if diaminopimehc acid 

 reversed the inhibition of a-pimehc acid, and I also would like 

 to ask if there is any evidence of conversion of dipicolinic acid 

 into diaminopimelic acid upon germination? 



Halvorson: The answer to your first question is that there is 

 quite good evidence now that diaminopimelic acid is not a 

 precursor of dipicolinic acid. Furthermore, it does not reverse 

 the inhibition of a-pimelic acid. Whether dipicolinic acid can be 

 converted into diaminopimelic acid has not been tested. 



