Research Areas > Diagnosis of Biological Flows & Biomimetics

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Natural Pattern Formation I. Repeating action

Post Image Repeatability of the responsiveness with time is one important concern for effective durable functions of stimuli-responsive materials. Although the increase in the yield and tensile strength of the hybrid composite materials by nanoparticle (NP) incorporation has been reported, exact NP effect on stimuli-responsiveness is rarely reported. In this study, a set of nanoscale actuating system is demonstrated by a thermo-sensitive process operated by polyethylene glycol (PEG) linked by gold nanoparticle (AuNP). This designed nanocomposite exclusively provides an artificial on/off gate fun...   내용 보기

Dynamic movement of sensitive plants: Mimosa pudica

Post Image How plants move in the lack of muscle has attracted the interest of many scientists since the age of Darwin. Especially, one of sensitive plants, Mimosa pudica, interestingly shows rapid motion in a wide range of angle. Not only can be understanding the motile mechanism of Mimosa pudica a clue to the riddles about the physiology of plant movements, but also it can provide inspiration for biomimetic design in the areas of microactuation and robotics in engineering. Mimosa pudica moves rapidly in response to an external stimulation. Pulvinus, secondary pulvinus and pulvinule are the important co...   내용 보기

Basic physics of transpiration at plant leaves

Post Image Interestingly, plant leaves are a kind of hydraulic pump operating without any mechanical power source. The deep understanding of transpiration in plants will provide inspiration for the development of novel biomimetic applications. Thus, study on basic physics of transpiration at plant leaves is challengeable research.      During the transpiration process at leaves inevitably huge amount of water is lost through stomata and replenished from xylem bundle sheath. The uptaken water is accumulated on the cell walls and evaporated into air spaces.     In th...   내용 보기

Liquid-feeding system of butterflies

Post Image Butterflies drink nectar through a slender proboscis using a large pressure gradient induced by the systaltic operation of a muscular pump inside their head. The proboscis is a naturally well-designed coiled micro-conduit for liquid uptake and deployment. The dynamic behavior of the butterfly pump system during liquid feeding exhibit the large variation in stroke volume to adapt high flow resistance in the long proboscis. By analyzing the liquid-sucking structure of a butterfly, we could develop a bio-inspired integrated micro-channel and pump system.      (A) Nectar-feeding ...   내용 보기

Visualization of transfected-single malaria parasite in the mosquito salivary duct

Post Image Life cycle of malaria parasites (From A. E. Brown and F. Catteruccian, BioTechniques, 2006)   During the last century, there were many efforts to fight against infectious diseases transmitted by mosquitoes in multiple ways. Malarial infection starts with the inoculation of Plasmodium sporozoites by mosquitoes during the blood-sucking process.     During the blood-feeding of a female mosquito, malaria parasites are injected to host by salivary pump. The optimized migration speed of sporozoites may correlate with persistence length and dispersal under different environments....   내용 보기

Diagnosis of blood-sucking mechanism of a female mosquito and development of biomimic technology

Post Image Commercial pump systems used to transport bio-fluids of high viscosity have some problems such as relatively big size, and high precision control of flow rate. The object of this study is to develop a new concept of micro-pump based on the understanding on the mosquito’s pumping mechanism.   The blood-sucking of a mosquito relies on the contraction/expansion of muscles located inside its head. To observe the pumping mechanism of those pump muscles, this blood-sucking flow inside a female mosquito’s food canal was measured in vivo. As a preliminary result, the flow inside the food canal...   내용 보기

Hydraulic regulation in xylem vessels of plants for efficient water transport

Post Image Arabidopsis as a model of dicot xylem structure   Different xylem vessel activity monitored by AuNPs staining   Experimental method:   -  Synchrotron X-ray CT       [Xylem network 3D organization]   -  Hydrophilic AuNPs solution       [Indicator of sap flow rate]    내용 보기

Two-photon microscopy for in vivo monitoring of chloroplast movement

Post Image   3D movement of chloroplast in intact maize leaves under different light irradiation.   To reveal the secrete of chloroplasts; absorb, transfer, store solar energy.   내용 보기

Analysis of mosquito's pumping system

Post Image How can we visualize the internal structure object?   - Synchrotron X-ray can visualize the opaque object that visible light cannot penerate.   Analysis for dynamic motion of the two pumping organs of mosquitoes     Comparison of pumping performance of male and female mosquitoes       - The synchrotron X-ray microscopy permits to observe the internal structure of mosquitoes.   - The two pumps work rhythmically with a phase shift to regulate fluid transport into the digestive organs.   - Blood-sucking frequency of female mosquitoe...   내용 보기

Visualization of blood-sucking flow inside the mosquito's food canal

Post Image   Mosquito's pump has been optimized throughout the history. It has the volume about 1/10^6 of commercial micro pumps which have similar pumping capacity. The power per unit volume is around one hundred times better than those of commercial micro pumps. Moreover, the blood pumping mechanism of the female mosquito has not revealed yet.       Velocity signal of blood flow in the food canal of a female mosquito and its pulsating frequency       - Distinct pulsatile blood-sucking characteristics are observed inside the proboscis. - Indir...   내용 보기