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The Analysis of Spiral Growth in Phycomyces Using a Novel Optical Method
Author(s) -
Joseph K. E. Ortega,
John F. Harris,
R. Igor Gamow
Publication year - 1974
Publication title -
plant physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.554
H-Index - 312
eISSN - 1532-2548
pISSN - 0032-0889
DOI - 10.1104/pp.53.3.485
Subject(s) - phycomyces , elongation , spiral (railway) , physics , rotation (mathematics) , conical surface , displacement (psychology) , measure (data warehouse) , growth rate , optics , mechanics , biology , mathematics , geometry , mathematical analysis , biophysics , materials science , computer science , psychology , database , metallurgy , psychotherapist , ultimate tensile strength
A conical mirror was designed and used to measure simultaneously the elongational and rotational displacement of a number of markers on the growing zone of the sporangiophore of Phycomyces. The results obtained by this new optical method demonstrate that the rotational rate is roughly proportional to the elongational rate, except in the lower region of the growing zone where a significant amount of rotation occurs without measurable elongation. From the data presented in this report, we have constructed a model that appears to explain the mechanism responsible for the left-handed spiral growth of the developing sporangiophore.

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