238 ELECTROLYTES IN BIOLOGICAL SYSTEMS 



67. Steinbach, H. B. The electrical potential difference across living frog skin. /. Cell. & 

 Com p. Physiol. 3: i, 1933. 



68. Steinbach, H. B. Potassium in frog skin. /. Cell. & Comp. Physiol. 10: 51, 1937. 



69. Teorell, T. Membrane electrophoresis in relation to bioelectrical polarization effects. 

 Arch. Sci. Physiol. 3: 205, 1949. 



70. UssiNG, H. H. The active ion transport through the isolated frog skin in the light of 

 tracer studies. Acta Physiol. Scandinav. 17:1, 1949. 



71. UssiNG, H. H. The distribution by means of tracers between active transport and diffu- 

 sion. Acta Physiol. Scandinav. 19: 43, 1949. 



72. UssiNG, H. H. Transport of ions across cellular membranes. Physiol. Rev. 29: 127, 1949. 



73. UssiNG, H. H. AND K. Zerahn. Active transport of sodium as the source of electric 

 current in the short-circuited isolated frog skin. Acta Physiol. Scandinav. 23: no, 1951. 



74. UssiNG, H. H. Some aspects of the application of tracers in permeabiHty studies. Ad- 

 vances Enzymol. 13: 21, 1952. 



75. UssiNG, H. H. Transport through biological membranes. Ann. Ra'. Physiol. 15: i, 1953. 



76. UssiNG, H. H. Ion transport across biological membranes. In: Ion Transport Across 

 Membranes. (H. T. Clarke and D. Nachmansohn eds.) New York: Acad. Press, 1954, 



P- 3- 



77. Wald, G. Biochemical evolution. In: Modern Trends in Physiology and Biochemistry. 

 (E. S. G. Barron ed.) New York, Acad. Press, 1952, p. 337. 



78. Wertheimer, E. Weitere Studien ueber die Permeabilitaet lebender Membranen. V. 

 Mitteilung. Ueber die Kraefte, die Wasserbewegung durch eine lebende Membran 

 bedingen. Pflilger's Arch. f. d. ges. Physiol. 201: 591, 1923. 



