. 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). Id' id' z % 20 0 - '^ -20 -to - \ a I y^ °>CH-COOH \ CI -60 - \ Bis-2:'t-dichlorophen- \ oxyacetic acid â SO \ 1 ⺠W" 10^ 10^ f^ 10° 10^ %. Fioiire 10. The molecular model of the 'twin' bis-2 â A-dichlowphenoxyacetic acid in comparison with the molecular model of tetrachlorofluorescein. Abscissae: log concn. Ordinates: change in length of coleoptiles as per cent oj control. Structure, is able to
. 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). Id' id' z % 20 0 - '^ -20 -to - \ a I y^ °>CH-COOH \ CI -60 - \ Bis-2:'t-dichlorophen- \ oxyacetic acid â SO \ 1 ⺠W" 10^ 10^ f^ 10° 10^ %. Fioiire 10. The molecular model of the 'twin' bis-2 â A-dichlowphenoxyacetic acid in comparison with the molecular model of tetrachlorofluorescein. Abscissae: log concn. Ordinates: change in length of coleoptiles as per cent oj control. Structure, is able to fall into the standard position. A molecule like the Siamese twin (bis-2:4-dichlorophenoxyacetic acid) is, in spite of its chemically related structure, not able to fall into the standard position and shows no promoting action. On the other hand, this twin molecule is able to fall into another position which is quite similar to that of the substituted fluorescein molecule {Figure 10) and we know that substituted fluoresceins, such as tetrachloro-, tetrabromo-, and tetraiodofluorescein, all show growth- inhibiting actions {Figure 11) which are stronger than those shown by the twin molecule. Comparing the molecular forms of the unsuJDStituted and 152. 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
Size: 2247px × 1112px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiver, booksubjectgrowthplants
