Abstract
MR. A. L. BACHARACH‘s letter1 on the use of the plate-and-cylinder method in reverse for assaying certain growth-factors suggests that it may be of interest to record some very similar experiments which I carried out during 1944–45.
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References
Bacharach, A. L., Nature, 160, 640 (1947).
Chain, E., Florey, H. W., Gardner, A. D., Heatley, N. G., Jennings, M. A., Orr-Ewing, J., and Sanders, A. G., Lancet, ii, 226 (1940).
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WILLIAMS, T. A Modified Microbiological Assay Procedure. Nature 161, 19 (1948). https://doi.org/10.1038/161019a0
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DOI: https://doi.org/10.1038/161019a0
