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Uptake of liquid from wet surfaces by the brush-tipped proboscis of a butterfly.

Lee SC, Lee SJ - Sci Rep (2014)

Bottom Line: This study investigated the effect of the brush-tipped proboscis of the Asian comma (Polygonia c-aureum) on wet-surface feeding.Based on these observations, we demonstrated that the sensilla styloconica promotes the uptake of liquid from wet surfaces.This study may inspire the development of a microfluidic device to collect liquid from moist substrates.

View Article: PubMed Central - PubMed

Affiliation: 1] Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang Gyeongbuk, Republic of Korea [2] Center for Biofluid and Biomimic Research, Pohang University of Science and Technology, Pohang Gyeongbuk, Republic of Korea.

ABSTRACT
This study investigated the effect of the brush-tipped proboscis of the Asian comma (Polygonia c-aureum) on wet-surface feeding. The tip region of this proboscis was observed, especially two microstructures; the intake slits through which liquid passes into the proboscis and the brush-like sensilla styloconica. The sensilla styloconica were connected laterally to the intake slits in the tip region. The liquid-feeding flow between the proboscis and the wet surface was measured by micro-particle image velocimetry. During liquid feeding, the sensilla styloconica region accumulates liquid by pinning the air-liquid interface to the tips of the sensilla styloconica, thus the intake slit region remains immersed. The film flow that passes through the sensilla styloconica region shows a parabolic velocity profile, and the corresponding flow rate is proportional to the cubed length of the sensilla styloconica. Based on these observations, we demonstrated that the sensilla styloconica promotes the uptake of liquid from wet surfaces. This study may inspire the development of a microfluidic device to collect liquid from moist substrates.

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Model established for uptake of liquid from wet surfaces by a brush-tipped proboscis.The schematics represent the dorsal side of the tip region of the proboscis that touches the wet surface (not to scale). (a) When a butterfly touches the wet surface with the dorsal side of its proboscis, the intake slit region (dark gray) is immediately soaked with the aid of capillary force. The thin liquid layer (light blue) is sucked into the intake slits through the sensilla styloconica, which in turn collects water and expands the suction area. (b) Liquid is accumulated in the sensilla styloconica region while the intake slit region remains immersed to promote liquid intake. The blue arrows indicate the flow directions. e is the thickness of the accumulated liquid.
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f6: Model established for uptake of liquid from wet surfaces by a brush-tipped proboscis.The schematics represent the dorsal side of the tip region of the proboscis that touches the wet surface (not to scale). (a) When a butterfly touches the wet surface with the dorsal side of its proboscis, the intake slit region (dark gray) is immediately soaked with the aid of capillary force. The thin liquid layer (light blue) is sucked into the intake slits through the sensilla styloconica, which in turn collects water and expands the suction area. (b) Liquid is accumulated in the sensilla styloconica region while the intake slit region remains immersed to promote liquid intake. The blue arrows indicate the flow directions. e is the thickness of the accumulated liquid.

Mentions: A wide inlet structure may facilitate the efficient suction of exposed liquid from large surfaces, such as rotting fruits, mud puddles, and tree saps. The intake slits allowing liquid to enter the food canal protrudes from the dorsal side to make contact with wet surfaces. The elongated sensilla styloconica were serially connected to the intake slits in 80% of the tip region. The flow to the intake slit was guided by the sensilla styloconica, which suggests that this structure extends the effective inlet area and increases the area of contact with wet surfaces. Moreover, both the sensilla styloconica and intake slits constitute parallel micro-grooves in the tip region. This micro-texture promotes capillary flow on the surface15. The small capillary number in the order of 10−5 indicates that capillary force would mainly contribute to the initial imbibition from wet surfaces although butterflies feed on liquid by active suction (Fig. 6a).


Uptake of liquid from wet surfaces by the brush-tipped proboscis of a butterfly.

Lee SC, Lee SJ - Sci Rep (2014)

Model established for uptake of liquid from wet surfaces by a brush-tipped proboscis.The schematics represent the dorsal side of the tip region of the proboscis that touches the wet surface (not to scale). (a) When a butterfly touches the wet surface with the dorsal side of its proboscis, the intake slit region (dark gray) is immediately soaked with the aid of capillary force. The thin liquid layer (light blue) is sucked into the intake slits through the sensilla styloconica, which in turn collects water and expands the suction area. (b) Liquid is accumulated in the sensilla styloconica region while the intake slit region remains immersed to promote liquid intake. The blue arrows indicate the flow directions. e is the thickness of the accumulated liquid.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4221773&req=5

f6: Model established for uptake of liquid from wet surfaces by a brush-tipped proboscis.The schematics represent the dorsal side of the tip region of the proboscis that touches the wet surface (not to scale). (a) When a butterfly touches the wet surface with the dorsal side of its proboscis, the intake slit region (dark gray) is immediately soaked with the aid of capillary force. The thin liquid layer (light blue) is sucked into the intake slits through the sensilla styloconica, which in turn collects water and expands the suction area. (b) Liquid is accumulated in the sensilla styloconica region while the intake slit region remains immersed to promote liquid intake. The blue arrows indicate the flow directions. e is the thickness of the accumulated liquid.
Mentions: A wide inlet structure may facilitate the efficient suction of exposed liquid from large surfaces, such as rotting fruits, mud puddles, and tree saps. The intake slits allowing liquid to enter the food canal protrudes from the dorsal side to make contact with wet surfaces. The elongated sensilla styloconica were serially connected to the intake slits in 80% of the tip region. The flow to the intake slit was guided by the sensilla styloconica, which suggests that this structure extends the effective inlet area and increases the area of contact with wet surfaces. Moreover, both the sensilla styloconica and intake slits constitute parallel micro-grooves in the tip region. This micro-texture promotes capillary flow on the surface15. The small capillary number in the order of 10−5 indicates that capillary force would mainly contribute to the initial imbibition from wet surfaces although butterflies feed on liquid by active suction (Fig. 6a).

Bottom Line: This study investigated the effect of the brush-tipped proboscis of the Asian comma (Polygonia c-aureum) on wet-surface feeding.Based on these observations, we demonstrated that the sensilla styloconica promotes the uptake of liquid from wet surfaces.This study may inspire the development of a microfluidic device to collect liquid from moist substrates.

View Article: PubMed Central - PubMed

Affiliation: 1] Department of Mechanical Engineering, Pohang University of Science and Technology, Pohang Gyeongbuk, Republic of Korea [2] Center for Biofluid and Biomimic Research, Pohang University of Science and Technology, Pohang Gyeongbuk, Republic of Korea.

ABSTRACT
This study investigated the effect of the brush-tipped proboscis of the Asian comma (Polygonia c-aureum) on wet-surface feeding. The tip region of this proboscis was observed, especially two microstructures; the intake slits through which liquid passes into the proboscis and the brush-like sensilla styloconica. The sensilla styloconica were connected laterally to the intake slits in the tip region. The liquid-feeding flow between the proboscis and the wet surface was measured by micro-particle image velocimetry. During liquid feeding, the sensilla styloconica region accumulates liquid by pinning the air-liquid interface to the tips of the sensilla styloconica, thus the intake slit region remains immersed. The film flow that passes through the sensilla styloconica region shows a parabolic velocity profile, and the corresponding flow rate is proportional to the cubed length of the sensilla styloconica. Based on these observations, we demonstrated that the sensilla styloconica promotes the uptake of liquid from wet surfaces. This study may inspire the development of a microfluidic device to collect liquid from moist substrates.

Show MeSH