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| Titel |
The ice nucleation ability of one of the most abundant types of fungal spores found in the atmosphere |
| VerfasserIn |
R. Iannone, D. I. Chernoff, A. Pringle, S. T. Martin, A. K. Bertram |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 3 ; Nr. 11, no. 3 (2011-02-11), S.1191-1201 |
| Datensatznummer |
250009301
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| Publikation (Nr.) |
 copernicus.org/acp-11-1191-2011.pdf |
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| Zusammenfassung |
| Recent atmospheric measurements show that biological particles are a
potentially important class of ice nuclei. Types of biological particles
that may be good ice nuclei include bacteria, pollen and fungal spores. We
studied the ice nucleation properties of water droplets containing fungal
spores from the genus Cladosporium, one of the most abundant types of spores
found in the atmosphere. For water droplets containing a Cladosporium spore
surface area of ~217 μm2 (equivalent to ~5 spores with
average diameters of 3.2 μm ), 1% of the droplets froze by
−28.5 °C and 10% froze by –30.1 °C. However, there was a strong
dependence on freezing temperature with the spore surface area of
Cladosporium within a given droplet. Mean freezing temperatures for droplets
containing 1–5 spores are expected to be approximately −35.1 ± 2.3 °C (1σ S. D.). Atmospheric ice nucleation on spores of
Cladosporium sp., or other spores with similar surface properties, thus do
not appear to explain recent atmospheric measurements showing that
biological particles participate as atmospheric ice nuclei. The poor ice
nucleation ability of Cladosporium sp. may be attributed to the surface
which is coated with hydrophobins (a class of hydrophobic proteins that
appear to be widespread in filamentous fungi). Given the ubiquity of
hydrophobins on spore surfaces, the current study may be applicable to many
fungal species of atmospheric importance. |
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