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University of Graz News Schon gewusst?

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Tuesday, 21 July 2015

Schon gewusst?

Das exakte physikalische Phänomen weshalb Fliegen kopfüber auf der Decke sitzen können, ist bis heute nicht restlos geklärt. Foto: Pixabay

Das exakte physikalische Phänomen weshalb Fliegen kopfüber auf der Decke sitzen können, ist bis heute nicht restlos geklärt. Foto: Pixabay

Mit Hilfe der Van-der-Waals-Kräfte können Fliegen auf der Zimmerdecke sitzen

Warum können Fliegen auf der Decke sitzen? Der Zoologe Dr. Manfred Hartbauer von der Universität Graz klärt auf: „Fliegen haben ein sehr geringes Körpergewicht und dazu lappige Bein-Enden. Aufgrund der großen Oberfläche haften die Tiere an der Decke oder können auch kopfüber Wände hinunterkrabbeln. Dabei wirken die so genannten Van-der-Waals-Kräfte wie ein unsichtbarer Klebstoff. Das exakte physikalische Phänomen dahinter ist bis heute nicht restlos geklärt. Auch Geckos können sich auf dieselbe Art auf extrem glatten Wänden und Decken fortbewegen. Manche Ameisen, die in asiatischen Regenwäldern leben, haben an ihren Füßen winzige Körperöffnungen, über die sie eine Flüssigkeit absondern. Diese wirkt wie ein Klebefilm auf dem Untergrund, sodass die Tierchen sogar auf äußerst rutschigen fleischfressenden Pflanzen krabbeln können und andere Insekten, die hineingestürzt sind, wieder herausschleppen.“

created by Dagmar Eklaude

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They were to be brought up to become the future elite of National Socialism: boys and girls aged ten and over who, following the ‘Anschluss’ of Austria to the German Reich, attended a so-called Napola (short for Nationalpolitische Lehranstalt; also known as NPEA, Nationalpolitische Erziehungsanstalt). There were nine such institutions in what is now Austria between 1939 and 1945.

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