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1-Methylcyclopropene(1-MCP)와 MAP 처리가 저온 저장 중 복숭아 ‘대홍’의 품질 변화에 미치는 영향
노유한,이주환,권용범,최인이,정햇님,강호민 (사) 한국생물환경조절학회 2023 생물환경조절학회지 Vol.32 No.4
본 연구는 ‘대홍’ 복숭아를 대상으로 수확 후 1-MCP 처리와 MAP가 저온 저장 중 복숭아 ‘대홍’의 품질 변화에 미치는영향을 알아보고자 수행하였다. 1-MCP는 1μL·L-1과 2μL·L-1 농도로 처리하여, MAP 포장 후 온도 5±1℃, 습도 85±5%의저온 저장고에서 28일 저장하였고, 포장 대조구로 골판지 상자를 설정하여 품질변화를 비교하였으며, 각각의 포장 처리구에는 1-MCP를 처리하지 않은 대조구로 두었다. 저장 중 생체중 감소율은 MAP 포장구에서 1-MCP 처리구와 무처리구과실 간에 유의한 차이가 없었으며 MAP보다 골판지 상자 포장구의 과실에서 감소율이 높았다. 호흡률과 에틸렌 발생률은 1μL·L-1 처리구와 2μL·L-1 처리구에서 유사한 경향을 나타내었고, 대조구는 1-MCP 처리구와 통계적 유의성을 보이며높게 발생하였다. 포장 내 이산화탄소는 1-MCP 처리구에서12% 내외로 무처리구에 비해 낮았고, 에틸렌은 1μL·L-1 처리구의 과실에서 다른 처리구와 유의성을 보이며 가장 낮게 유지되었다. 저장 기간이 경과할수록 경도는 대조구보다1-MCP와 MAP를 처리한 과실에서는 9%(1μL·L-1 MAP)와5%(2μL·L-1 MAP)로 유의하게 연화가 억제되었다. 과피와과육의 Hunter a* 값은 1μL·L-1 처리구에서 대조구보다 유의하게 높았고, 안토시아닌도 1μL·L-1 처리구에서 다른 처리구에 비해 저장 중 높은 값을 나타내었으며, 특히 MAP 포장한과실에서 높았다. 위의 결과를 종합해 보면, 1μL·L-1를 처리한MAP 포장구에서 ‘대홍’ 복숭아의 저장 중 호흡률 및 에틸렌발생량이 낮았고 경도, 과피와 과육의 Hunter a* 및 안토시아닌 함량 변화가 적은 것으로 조사되어 ‘대홍’ 복숭아의 저장 중품질 유지에 가장 적합하다고 판단된다. This study is in order to the effect of 1-methlycyclopropene (1-MCP) treatment and film package as modified atmosphere packaging (MAP) on the changes in fruit quality factors of 'Daehong' peaches during cold storage. The concentrations of 1-MCP were treated at 1μL·L-1 and 2μL·L-1, and peaches in film package were stored for 28 days in cold storage at 5±1°C and 85±5% RH. The fruits stored carton box were used as a control of MAP, and 1-MCP free fruits were used as the control of both packages. Rate of fresh weight loss during storage was not significantly different between groups with and without 1-MCP treatment, but was higher in the box package than in the MAP. The control group had a higher incidence of both gases with the 1-MCP treatment group showing statistically significantly low. Carbon dioxide in the package was lowered by about 12% compared to the non-treated group, and the ethylene concentration was maintained at 1μL·L-1, showing a significance low compared to other treated groups. As the storage period elapsed, the firmness of 1-MCP and MAP treated fruits remained significant at 5-9% compared to the control group. Regardless of the packaging method Hunter a* values of exocarp and mesocarp were significantly higher in fruit treated with 1-MCP 1μL·L-1 treatment than in the control group, and anthocyanin was significantly higher in the fruit during the storage period, especially high in MAP. In summary, fruits of MAP group with 1-MCP 1μL·L-1 had rate of lower respiration and ethylene production, and little changes in firmness, Hunter a* values of exo-carp and meso-carp, and anthocyanin, which is considered the most suitable method for preserving postharvest quality of the peach cultivar during the storage.
노태석,홍종원,이원재,유한수,유대현,김영석 대한미용성형외과학회 2013 Archives of Aesthetic Plastic Surgery Vol.19 No.2
Keloids are characterized by excessive extracelluar matrix (ECM) deposition such as collagen, fibronectin,elastin, and proteoglycans in the dermis. Recently, the use of botulinum toxin A (BTXA) in the treatment of keloids have had good results. To investigate the therapeutic effect of BTXA on the keloids, we evaluated the mRNA expression of collagen type I, type III, MMP (matrix metalloproteinases)-1, and TIMP (tissue inhibitor of metalloproteinases)-1 on keloid fibroblasts (KFs, n=5) after administration of BTXA. We also evaluated the enzymatic activity of MMP-2 and 9 by using zymography with BTXA. The same process was repeated after administration of TGF-ß in addition to BTXA. Type III collagen mRNA expression was decreased significantly when BTXA was administrated on KFs regardless of the presence or absence of TGF-ß. MMP-1 mRNA expression in KFs was increased according to the BTXA concentration increment, however, not increased with TGF-ß. Moreover, MMP-2 enzymatic activity in KFs was increased when BTXA administrated regardless of the presence or absence of TGF-ß. These results suggest that the down regulation of collagen III expression,the up regulation of MMP-1, and increased MMP-2 enzymatic activity on KFs after BTXA administration are able to decrease the excess collagen deposition in keloids.
MeV이온주입을 사용하여 Buried Layer를 포함한 CMOS Retrograde Well 제조시 발생하는 격자 결함에 관한 연구
盧在相,柳承翰,柳漢權 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2
MeV ion implantation has been recently employed in the field of CMOS (complementary metal oxide semiconductor) retrograde well engineering. An issue on MeV ion induced damage is critical especially in forming a buried layer below the well. MeV B implanted buried layers were observed to show greatly improved characteristics of latchup suppression. Junction leakage current, however, showed a critical behavior as a function of ion does. The rod like defects were observed to be responsible for the leakage current. Rod-like defects were generated near the ??(projected range) and grown upward to the surface during annealing. According to cross sectional examination of each pit density, they were generated and propagated between 700。C and 800。C. They shrink or change into long, elongated dislocation loops at higher temperatures above 900。C. Results of SIMS (secondary ion mass spectroscopy) analyses and two-step-annealing (700。C/3∼6hrs.→900。C/1hr.) indicate that interstitial oxygens impede shrinkage of existing-g rod-like defects at higher temperatures above 900。C.