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- W2340691951 abstract "From an analysis of the Brownian motion of particles in sieve elements of Heracleum mantegazzianum and Heracleum sphondylium , Barclay and Johnson have suggested that the in situ viscosity of sieve tube sap is four to six times higher than has previously been assumed. In particular, they obtained a value for the sap viscosity of about 10~2 Pa s, which compares with a value of 2 x 103 Pa s for a 20 per cent (w/v) sucrose solution. The present paper describes a reanalysis of their data. It is argued that Barclay & Johnson underestimated the Brownian motion of sieve element particles and so overestimated the sap viscosity. An exact correction was not possible, but it is concluded that the in situ viscosity of Heracleum sieve tube sap must be less than 3 x 10~3 Pa s, which corresponds to a sucrose concentration of less than 29 per cent. Hence it may not be unreasonable to suppose that the viscosity of sieve tube sap is determined primarily by the concentration of sucrose, as has been assumed in theoretical analyses of the Munch hypothesis. It is also concluded that the sieve tubes studied by Barclay and Johnson were not functional, in the sense that they did not exhibit an axial bulk flow of sap." @default.
- W2340691951 created "2016-06-24" @default.
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- W2340691951 date "1986-05-01" @default.
- W2340691951 modified "2023-09-27" @default.
- W2340691951 title "A Reanalysis of Particle Motion in Sieve Tubes of Heracleum" @default.
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- W2340691951 doi "https://doi.org/10.1093/oxfordjournals.aob.a087149" @default.
- W2340691951 hasPublicationYear "1986" @default.
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