. The chemistry and mode of action of plant growth substances; proceedings of a symposium held at Wye College, University of London, July 1955. Plant regulators; Auxin; Growth (Plants). ^b Rk ^lAi Figure 13. The dimensions of the molecule in projection on the ring-plane in the standard position of the side-chain. Mi = length of the molecule; M,, = breadth of the molecule; Rj = length of the ring; R^ = breadth of the ring; S^ = distance of the side-chain from the opposite side of the ring. Figure 12. Molecular models of 2:3:5-tri- iodobenzoic acid (top). 4:6-dinitroorthocresol [middle) and dini
. The chemistry and mode of action of plant growth substances; proceedings of a symposium held at Wye College, University of London, July 1955. Plant regulators; Auxin; Growth (Plants). ^b Rk ^lAi Figure 13. The dimensions of the molecule in projection on the ring-plane in the standard position of the side-chain. Mi = length of the molecule; M,, = breadth of the molecule; Rj = length of the ring; R^ = breadth of the ring; S^ = distance of the side-chain from the opposite side of the ring. Figure 12. Molecular models of 2:3:5-tri- iodobenzoic acid (top). 4:6-dinitroorthocresol [middle) and {bottom). similar in their form to that of cosine; we know that compounds with one ring-system, like 2:3:5-triiodobenzoic acid, are also strong inhibitors; it is therefore of interest to see that the inhibiting substance 4:6-dinitrocresol is very similar in its form to 2:3:5-triiodobenzoic acid {Figure 12).^ Our work on the comparison of structural forms and active positions of the molecules of growth substances and growth inhibitors is, as yet, in an early stage and I regret that I cannot give you definitive and conclusive results but only point out some possibilities for proceeding further in the field of our research. In the standard position every molecule shows different measure- ments (see Figure 13). We have carried out measurements in a long series of different molecules, promoting, inhibiting, and inactive ones, and our 154. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wye College; Wain, R. L; Wightman, F. (Frank). London, Butterworths Scientific Publications
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Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectgrowthplants
