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- W1972533384 abstract "Evidence is presented in support of the hypothesis that the expansion of Buller's drop on basidiospores is by condensation of water vapour around hygroscopic material extruded from the hilar appendix. Earlier work had shown that detached ballistospores of Itersonilia could still develop Buller's drop which could attain 60% of the volume of the spore, but with no measurable decrease in spore size. Using time-lapse photomicrography it was shown that in 8 basidiomycetes including Uredinales, Homo- and Heterobasidiomycetes, drop expansion was not associated with reduction in basidiospore dimensions. The rate of drop expansion in a near-saturated atmosphere over water-agar was similar in 5 basidiomycetes. In Auricularia auricula-judae the rate of drop expansion could be controlled by lowering the water activity of the agar by the addition of 1–3% mannitol. When liquid which condensed around basidiospores of Agaricus bisporus on a cooled microscope slide was evaporated, a hygroscopic residue remained. In a theoretical treatment of the expansion of a drop by condensation from a saturated atmosphere around hygroscopic material it is shown that the expansion of a drop to a radius of 4 μm in 10–14 s could be achieved by a lowering of the water vapour pressure at the surface of the drop equivalent to a relative saturation deficit of about 1·5 × 10−3. This suggests that a low solute concentration of the order of 0·08 m in the drop would be sufficient. It is also shown that the shape of the drop expansion curves is consistent with the physical principles involved." @default.
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- W1972533384 date "1989-10-01" @default.
- W1972533384 modified "2023-10-16" @default.
- W1972533384 title "Vapour as the source of water in Buller's drop" @default.
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- W1972533384 doi "https://doi.org/10.1016/s0953-7562(89)80156-x" @default.
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