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1P-160 Manufacturing of highly conductive nano-particle copper ink for ink-jet printing
이언주,전호영,박도휘,류시옥 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Many industries are focused on the development of the inkjet printing technology. Among conventional metallic inks, silver ink is a typical metallic ink having high conductivity and thermal stability. However, there is a limitation to use it in the fabrication due to its high material cost. Copper is considered as a substitute material for replacing silver, but copper ink has an oxidation issue under atmospheric conditions. Copper complexes and copper nano particles were used in the synthesis to prevent its oxidation. The synthesized nano particles were thermally treated in the range of 300~700°C. The prepared copper ink was printed on the silicon substrate and the printed film was then characterized. Resistivity of the printed electrode was calculated from the cross-sectional area measured by a profilometer and resistance was measured by a digital multimeter. Surface morphology of the prepared electrode was also analyzed using scanning electron microscope(SEM).
계혈등 에탄올 추출물의 RANKL 처리 RAW264.7 세포의 분화와 염증성 골 손실에 미치는 영향
이대중,황종현,박도휘,강기성,전찬용,황귀서 대한한방내과학회 2022 大韓韓方內科學會誌 Vol.43 No.6
Purpose: We evaluated whether Spatholobus suberectus extract (SSE) can be used as a means of preventing and treating osteoporosis by measuring its effect on osteoclast differentiation, gene expression, and bone resorption. Methods: SSE was used to examine the effect on RAW 264.7 cells stimulated with RANKL to induce bone resorption. The inhibitory effect of TRAP formation and the expression of the bone resorption factors TRAP, cathepsin K, and MMP-9 during differentiation were measured. The effects on the differentiation-related factors NFATc and TRAIL and on the expression of OC-STAMP, DC-STAMP, ATP6v0d2, MITF, c-Fos, and inflammation-related factors were also evaluated. The effect on bone resorption was evaluated by culturing RANKL-treated osteoclasts on artificial bone fragments and observing the resulting resorption traces. The effect on bone damage in experimental animals was also measured. Results: SSE inhibited the differentiation of RANKL-stimulated osteoclasts into osteoclasts and suppressed the expression of cathepsin K, TRAP, MMP-9, NFATc1, TRAIL, MITF, OC-STAMP, DC-STAMP, ATP6v0d2, and c-Fos genes. Bone pore formation due to osteoclast action was also inhibited, and LPS-induced bone loss was suppressed in animal experiments. Conclusions: SSE could be useful for the prevention or treatment of osteoporosis by inhibiting osteoclast differentiation and bone resorption and suppressing bone loss induced in experimental animals. However, studies of larger populations are required.