Chemical structure and biological activity 



paper in this Symposium) from his studies on' the adsorption and penetration 

 of regulators on and into monolayers of plant lipoids. He found that two 

 chlorinated phenylacetic acids penetrated the film up to 5 times as much as 

 the corresponding phenoxyacetic acids. 



REFERENCES 



Chibnall, a. C. (1939). Protein Metabolism in the Plant. Yale University Press. 

 MuiR, R. M., and Hansch, C. (1953). On the mechanism of action of growth 



regulators. Plant Physiol. 28, 218. 

 Osborne, D. J., Blackman, G. E., Powell, R. G., Sudzuki, F., and Novoa, S. (1954). 



Growth regulating activity of certain 2 : 6-substituted phenoxyacetic acids. Nature, 



174, 742. 

 OvERBEEK, J. VAN, Blondeau, R., and HoRNE, V. (1955). Maleimides as auxin 



antagonists. Amer. J. Bot. 42, 205. 

 Thimann, K. V. (1951). The synthetic auxins: relation between structure and 



activity. Plant Growth Substances, ed. F. Skoog, University of Wisconsin Press, p. 21. 

 Veldstra, H. (1953). The relation of chemical structure to biological activity in 



growth substances. Ann. Rev. PI. Physiol. 4, 151. 



210 



