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• W2997696564 abstract "Abstract The sporangiophores of Phycomyces blakesleeanus are large cylindrical aerial cells that elongate vertically at rates between 10 μm/min and 60 μm/min. Wild‐type sporangiophores grow toward light, opposed to gravitational acceleration and away from solid barriers (tropic responses). Sporangiophores of stiff mutants C149 and C216 exhibit diminished tropic (bending) responses. Originally, it was thought that the altered genes affect the “stiffness” (elastic wall deformation) of the cell wall. Subsequent investigations employing the pressure probe demonstrated that the irreversible (plastic) wall deformation was smaller for the stiff mutants compared to wild type and could account for the diminished tropic responses. However, it was not shown whether the elastic wall deformation was altered in these stiff mutants. Recent theoretical studies have identified dimensionless numbers that can be used to quantitate the magnitudes of biophysical processes involved in expansive growth of walled cells. In this study, dimensionless numbers are used to determine the magnitudes of elastic deformation rate, plastic deformation rate, and stress relaxation rate of the cell wall during expansive growth of the stiff mutant sporangiophores. It is found that the altered genes reduce stress relaxation rates and plastic deformation rates of the wall, but do not significantly alter the magnitude of the elastic deformation rates of the wall. These results indicate that the mutant genes reduce wall loosening chemistry in these sporangiophores and the genetic mutation is not expressed in a change in “wall stiffness,” but in “wall viscosity” or “wall extensibility.”" @default.
• W2997696564 created "2020-01-10" @default.
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• W2997696564 date "2019-12-01" @default.
• W2997696564 modified "2023-09-24" @default.
• W2997696564 title "Dimensionless numbers to study cell wall deformation of stiff mutants of <i>Phycomyces blakesleeanus</i>" @default.
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• W2997696564 doi "https://doi.org/10.1002/pld3.195" @default.
• W2997696564 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6933610" @default.
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• W2997696564 hasPublicationYear "2019" @default.
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