Jae Bum Choo

Hanyang University, Sŏul, Seoul, South Korea

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Publications (2)4.59 Total impact

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    ABSTRACT: Fluorescent quantum dots (QDs) are powerful multipurpose interfaces of nanotechnology providing long-term and multicolor imaging of cellular and molecular interactions. The application of QDs in living organisms is just beginning to be explored, and zebrafish embryos may be suitable vertebrate model organisms for intravital imaging with QDs. To investigate their potential in skin research, we used QDs as microangiography contrast agents and attempted to visualize the cardiovascular system in zebrafish. We also attempted to find the pathway relationship between the cardiovascular system and the nerve network using QDs together with the transgenic zebrafish line. Quantum Dot QD605, which reveals green color under the fluorescent microscope, was used as a microangiography contrast agent. The olig2-Dsred transgenic zebrafish line, which expresses motor neurons in red color, was used together with QDs. Images of QD605-injected embryos were recorded with a digital camera. Combining the green fluorescence of QD605 and the red fluorescence of olig2-Dsred transgenic zebrafish, we could obtain detailed images manifesting the spatial relationship between the vascular and the nervous system of zebrafish QDs could easily be used as a bright microangiography agent in living embryos. Our image of the vascular and motor nervous system in zebrafish showed a similar pattern of trajectory overall. However, their segmented repetitive networks along the dorsoventral axis were not completely overlapped.
    Skin Research and Technology 06/2009; 15(2):157-60. · 1.41 Impact Factor
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    ABSTRACT: The effect of average pore size of nano-pore silica particles on protein adsorption characteristics was determined experimentally by the dissociation constant and the adsorption capacity determined from the Langmuir equation. As the average pore size was increased from 2.2 to 45 nm, the BSA adsorption capacity increased from 16.8 to 84.3 mg/g-silica so as the equilibrium constant (from 2.6 to 9.4 mg/ml). Using confocal microscopy with fluorescence labeling, we could visualize the protein adsorption in situ and determine the minimum pore size required for efficient intraparticle adsorption. The confocal microscopy analysis revealed that BSA was adsorbed mainly on the surface of the particles with a smaller pore size, but diffused further into the interstitial surface when it was sufficiently large. It was concluded that for BSA whose Stoke's diameter is ca. 3.55 nm the minimum pore size of about 45 nm or larger was required for a sufficient adsorption capacity.
    Journal of Biotechnology 10/2004; 112(3):267-77. · 3.18 Impact Factor