ni. CENTRIFUGATION 103 



It9. Svedberg, T., and S. Brohult, l<iaiure, 143, 03S (1039) (effect of X ray? 

 and ultraviolet on proteins). 



50. JuUander, I., J. Folymer Sci., 2, 329 (1947) (cellulose). 



51 . Lundgren, H. P., and J. W. Williams, J. Phys. Chem., 43, 989 (1939) 



(stability in protein systems). 



ANALYTICAL INVESTIGATION OF VIRUSES 



52. Lauffer, M. A., J. Am. Chem. Soc, 66, 1 188 (1944) (tobacco mosaic). 



53. Smadel, J. E., E. G. Pickels, and T. Sliedlovsky, J. E.vptl. Med., 68, (507 



(1938) (vaccinia). 



54. Pickels, E. G., and J. E. Smadel, /. Exptl. Med., 68, oS3 (1938) (vac- 



cinia). 



55. Beard, J. W., D. G. Sharp, A. R. Taylor, I. W. McLean, Jr., D. Beard, 



A. E. Feller, and J. H. Dingle, Southern Med. J., 37, 313 (1944) (in- 

 fluenza). 



56. Sharp, D. G., A. R. Taylor, and J. W. Beard, /. Biol. Chem., 163, 289 



(1946) (papilloma). 



57 . Taylor, A. R., D. G. Sharp, and J. W. Beard, J. Injectioxis Diseases, 67, 



59 (1940) (equine encephalomyelitis). 



58. Lauffer, I\L A., /. Biol. Chem., 143, 99 (1942) (bushy stunt). 



59. Knight, C. A., and W. M. Stanley, /. Biol. Chem., 141, 29 (1941) (cucum- 



ber) 



60. Pickels, E. G., and J. H. Bauer, J. Exptl. Med., 71, 703 (1940) (yellow 



fever) 



61 . Sharp, D. G., A. R. Taylor, L W. McLean, Jr., D. Beard, and J. W. 



Beard, Science, 100, 151 (1944) (density determination of viruses). 



PREPARATIVE CENTRIFUGATION 



62. Pickels, E. G., Rev. Sci. Instruments, 13, 101 (1942) (design of angle 



centrifuges). 



63. Masket, A. V., Rev. Sci. Instruments, 12, 277 (1941) (individually plugged 



tubes, angle centrifuge). 

 64- Taylor, A. R., D. G. Sharp, D. Beard, and J. W. Beard, J. Infectious 

 Diseases, 72, 31 (1843) (equine encephalomyelitis). 



65. Beard, J. W., W. R. Bryan, and R. W. G. Wyckoff, /. Infectious Diseases, 



65, 43 (1939) (rabbit papilloma virus). 



66. Cunha, R., I\L L. Weil, D. Beard, A. R. Taylor, D. G. Sharp, and J. W. 



Beard, J. Immunol., 55, 69 (1947) (Newcastle disease virus). 



67. Harris, T. N., J. Exptl. Med., 87, 41 (1948) (hemolytic streptococcus). 



68. Kabat, E. A., M. Heidelberger, and A. E. Bezer, /. Biol. Chem., 168, 



629 (1947) (ricin). 



69. Lauffer, M. A., and G. L. Miller, /. Exptl. Med., 80, 525 (1944) (in- 



fluenza virus). 



