File:Haareis an Totholz - Hair ice on rotten wood (8328864631).jpg

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Captions

Captions

Exidiopsis effusa associated with the formation of hair ice

Summary

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Description

during the night, temperatures dropped and evaporating water had frozen through capillars to form an organic pattern... there might build upon the the action of dissimilating mycelia (Asko- und Basidiomyzeten) in dead wood when humidity is very high as proposed by Gerhart Wagner und Christian Mätzler (2008)

"Der Druck des CO2-Gases, das durch den aeroben Stoffwechsel eines winteraktiven Pilzes entsteht, drängt das im Holz gespeicherte Wasser durch die Holzstrahlen an die Oberfläche. Im Wasser vorhandene organische Keime leiten den Gefrierprozess schon knapp unterhalb von 0° C ein (Immersionsmodus: die Keime sind schon vor der Abkühlung unter den Gefrierpunkt vor- handen). Bei Anwesenheit von Metaldehyd gefriert Wasser schon bei -0,4° C. Bei Haareis muss ein Stoff mit ähnlichen Eigenschaften im Spiel sein. Die durchlässigen Zellreihen der Holz- strahlen wirken als Austrittskanäle des leicht unterkühlten Wassers. Zwei Wärmequellen ver- zögern das Abkühlen des Holzes und damit das Gefrieren des im Holz enthaltenen Wassers: Die beim Atmungsprozess im Pilzmyzel entstehende Verbrennungswärme sowie die Wärme aus dem Phasenübergang des Wassers beim Gefrieren. Da sich die Stoffwechsel- aktivität des Pilzes unterhalb eines Optimums mit abnehmender Temperatur verringert, ist es einleuchtend, dass die Haareisbildung auf einen kleinen Temperaturbereich knapp unterhalb des Gefrier-punktes von Wasser beschränkt ist. Wenn das Wasser im Holz gefriert, hört das Haareis-wachstum auf." original publication /(Abstract in English): www.iap.unibe.ch/publications/pub-detail.php?lang=en&... more info (German): de.wikipedia.org/wiki/Haareis please compare: Needle ice (Kammeis), frost flowers

Germany, Hessen, Kassel: Habichtswald, ca. 400m asl., 27.12.2012

Exif_JPEG_422, _Foto-0007 (sorry for the bad technical quality, image is taken by my old cellphone)
Date
Source Haareis an Totholz / Hair ice on rotten wood
Author gbohne from Berlin, Germany

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This image was originally posted to Flickr by gbohne at https://www.flickr.com/photos/51216897@N07/8328864631. It was reviewed on 1 March 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0.

1 March 2015

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current14:31, 1 March 2015Thumbnail for version as of 14:31, 1 March 2015480 × 640 (200 KB)Natuur12 (talk | contribs)Transferred from Flickr via Flickr2Commons

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