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Butterfly proboscis to sip cells

Date:
November 25, 2009
Source:
American Institute of Physics
Summary:
A butterfly's proboscis looks like a straw -- long, slender and used for sipping -- but it works more like a paper towel, according to researchers. They hope to borrow the tricks of this piece of insect anatomy to make small probes that can sample the fluid inside of cells.
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A male Common Tiger (Danaus genutia) extended its proboscis for feeding on the nectar. This orange butterfly is commonly seen in urban area. Taken in Bangkok, Thailand.
Credit: iStockphoto

A butterfly's proboscis looks like a straw -- long, slender, and used for sipping -- but it works more like a paper towel, according to Konstantin Kornev of Clemson University. He hopes to borrow the tricks of this piece of insect anatomy to make small probes that can sample the fluid inside of cells.

Kornev will present his work at the 62nd Annual Meeting of the American Physical Society's (APS) Division of Fluid Dynamics will take place from November 22-24 at the Minneapolis Convention Center.

At the scales at which a butterfly or moth lives, liquid is so thick that it is able to form fibers. The insects' liquid food -- drops of water, animal tears, and the juice inside decomposed fruit -- spans nearly three orders of magnitude in viscosity. Pumping liquid through its feeding tube would require an enormous amount of pressure.

"No pump would support that kind of pressure," says Kornev. "The liquid would boil spontaneously."

Instead of pumping, Kornev's findings suggest that butterflies draw liquid upwards using capillary action -- the same force that pulls liquid across a paper towel. The proboscis resembles a rolled-up paper towel, with tiny grooves that pull the liquid upwards along the edges, carrying along the bead of liquid in the middle of the tube. This process is not nearly as affected by viscosity as pumping.

Kornev has been recently awarded an NSF grant to develop artificial probes made of nanofibers that use a similar principal to draw out the viscous liquid inside of cells and examine their contents.

The presentation, "Butterfly proboscis as a biomicrofluidic system" by Konstantin Kornev et al of Clemson University, is on November 22, 2009.


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The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


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American Institute of Physics. "Butterfly proboscis to sip cells." ScienceDaily. ScienceDaily, 25 November 2009. <www.sciencedaily.com/releases/2009/11/091122161748.htm>.
American Institute of Physics. (2009, November 25). Butterfly proboscis to sip cells. ScienceDaily. Retrieved April 27, 2015 from www.sciencedaily.com/releases/2009/11/091122161748.htm
American Institute of Physics. "Butterfly proboscis to sip cells." ScienceDaily. www.sciencedaily.com/releases/2009/11/091122161748.htm (accessed April 27, 2015).

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