506 BIBLIOGRAPHY APPENDIX 



Colorimetric and Tiinmeiric Methods (continued) : 



34. Bolomey, R. A., and Kemmerer, A. R. (1947). Spectrophotometric studies 



of the Roe method for the determination of dehydroascorbic acid. J. 

 Biol. Chem., 167: 781-785. 



35. Engel, M. G., and Engel, F. L. (1947). The colorimetric microdetermina- 



tion of urea nitrogen by the xanthydrol method. J. Biol. Chem., 167: 

 535-541. 



36. Kalckar, H. M. (1947). Differential spectrophotometry of purine com- 



pounds by means of specific enzymes. I. Determination of hydroxypurine 

 compounds. J. Biol. Chem., 167: 429-443. 



37. Kalckar, H. M. (1947). Differential spectrophotometry of purine com- 



pounds by means of specific enzymes. II. Determination of adenine 

 compounds. J. Biol. Chem., 167: 445-459. 



38. Kalckar, H. M. (1947). Differential spectrophotometry of purine com- 



pounds by means of specific enzymes. III. Studies of the enzymes of 

 purine metabolism. J. Biol. Chem., 167: 461-475. 



39. Kirk, P. L., Craig, R., Gullberg, J. E., and Boyer, R. Q. (1947). Quartz 



microgram balance, hid. Eng. Chem.., Anal. Ed., 19: 427-429. 



40. Kirk, P. L., Rosenfels, R. S., and Hanahan, D. J. (1947). Capillary absorp- 



tion cells in spectrophotometry. Ind. Eng. Chem., Anal. Ed., 19: 355-357. 



41. Lazarow, A. (1947). Microprecipitating unit for blood and tissue proteins. 



J. Lab. Clin. Med., 32: 213-214. 



42. Lazarow, A. (1947). A simple apparatus for quantitative microcolorimetric 



analysis in final volumes of 0.15 cc. /. Lab. Clin. Med., 32: 215-219. 



43. Mills, M. B., and Roe, J. H. (1947). A critical study of proposed modifica- 



tions of the Roe and Kuether method for the determination of ascorbic 

 acid, with further contributions to the chemistry of this procedure. 

 J. Biol. Chem., 170: 159-164. 



44. Natelson, S., and Zuckerman, J. L. (1947). Burette for microtitration ; 



Vernier applicable to the capillary micro burette. J. Biol. Chem., 170: 

 305-311. 



45. Richter, K. M. (1947). A precision micro-pipette trimmer. Science, 106: 



598-599. 



Gasometric and Gradient Tube Methods: 



46. Anfinsen, C. B., and Claff, C. L. (1947). An extension of the Cartesian 



diver micro respirometer technique. J. Biol. Chem., 167: 27-33. 



47. Claff, C. L. (1947). "Braking" pipettes. Science, 105: 103-104. 



48. Grant, W. C. (1947). Determination of O2 capacity on 39.3 cubic milli- 



meters of blood. Proc. Soc. Exptl. Biol. Med., 66: 60-62. 



49. Levi, H., and Zeuthen, E. (1946). Micro-weighing in the gradient tube. 



Compt. rend. trav. lab. Carlsberg, Sir. chim., 25: 273-287. 



50. Scholander, P. F. (1947). Analyzer for accurate estimation of respiratory 



gases in one-half cubic centimeter samples. /. Biol. Chem., 167: 235-250. 



51. Scholander, P. F., and Evans, H. J. (1947). Microanalysis of fractions of 



a cubic millimeter of gas. J. Biol. Chem., 169: 551-560. 



52. Scholander, P. F., Flemister, S. C, and Irving, L. (1947). Microgasometric 



