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한용진,조봉균,정재훈,이수빈,박해윤,이태기,채희백,홍진수 순천향대학교 기초과학연구소 1998 순천향자연과학연구 논문집 Vol.4 No.2
Thin amorphous carbon films were deposited by a Q-switched Nd;YAG 532nm with beam power density of ?? on the high purity graphite (99.7%). The pressure of vacuum chamber was ?? Torr. In order to estimate the quality of the Pulsed Laser Deposition films one of the most important optical properties, bandgap energy, was characterized by transmission and reflection in the range of the visible, and an optical direct bandgap energy of 2.45eV and indirect bandgap energy 0.36eV were obtained. Surface morphology of amorphous film was investigated by AFM (Atomic Force Microscopy). Its surface roughness is 70nm. Comparing our results with the published values in the literature we have confidence that our films show the good quality for optical properties.
Su Bin CHO 국제과학영재학회 2014 APEC Youth Scientist Journal Vol.6 No.2
Cell cryopreservation plays a central role in reproductive technology. A major impediment to the development of cell cryopreservation is that there has yet to be found cryopreservation solutions that successfully prevent destruction of cellular tissue caused by intracellular hydro expansion. This study utilized the Korean traditional bioceramic onggi in sperm cryopreservation. Onggi emits far-infrared ray that stimulates cellular biological activities, promotes antioxidant effects, and prevents cellular toxicity. This study explored onggi’s ability to maintain the structural integrity and motility of sperm when onggi exposure media are used as cryopreservation solutions. It also tested whether onggi exposure media could alleviate freeze damage caused by ice crystals and reduce toxicity of cryoprotectants. The results showed that onggi exposure media reduced sperm toxicity during freezing, minimized abrupt thermal changes during thawing, and promoted sperm motility before and after actual cryopreservation. Onggi exposure media could also alleviate the damaging toxicity effect that existing cryoprotectants inherently have on cells. In conclusion, if the conditions to produce a synergy effect between onggi and cryoprotectants during cryopreservation are met, the newfound properties of onggi may well aid in the advance of reproductive technology