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The variation of biomechanical property of chondrocyteunder the various biological conditions
Sang-Guk Park,Kwon-Yong Lee,Daehwan Shin,박종철,이인섭,Heayoung Lee 한국물리학회 2005 Current Applied Physics Vol.5 No.5
It has been reported that mechanical properties of tissue-engineered cartilage were signicantly lower than those of natural car-tilage, even though many eorts have been made to regenerate high quality articular cartilage by tissue engineering techniques. Fur-ther studies must be conducted to nd an optimal technique for regeneration of qualitative cartilage with the type of cells,extracellular matrices, growth factors, scaolds, and bioreactors providing a proper mechanical stimulation. In this study, the eectsof culture time and three dierent kinds of extra cellular matrixes (ECM) in two levels of density on the variation of stiness(Young.s modulus,Eof ECM coatings improved Young.s modulus of chondrocyte. Type II collagen and bronectin signicantly increased the Young.smodulus of chondrocyte after 4 h culture time. This suggested that the variations of biological environment aected the biomechan-ical property of chondrocyte. This result provided the valuable information to tissue engineering approaches for obtaining moreimproved biomechanical property of regenerated cartilage tissue..
Case Reports : Cutaneous Extraskeletal Osteosarcoma on the Scar of a Previous Bone Graft
( Sang Gon Park ),( Ji Young Song ),( In Guk Song ),( Min Sung Kim ),( Bong Seok Shin ) 대한피부과학회 2011 Annals of Dermatology Vol.23 No.2s
Extraskeletal osteosarcoma (ESOS) is a very rare malignant tumor of mesenchymal origin. It is rarer than osseous osteosarcoma and there are very few reports of the skin being a primary site. Most reported cutaneous ESOS were accompanied with metastasis in other organs. A 56-year-old man presented with a painful, 1.5×0.8 cm sized, brown- colored nodule on the right girdle area for 3 months. The histologic findings revealed a tumor that was confined to the dermis without connection to the subcutaneous tissue. In addition, there were large amounts of thin and lace-like bony trabeculae and osteoid with neoplastic cells in a highly pleomorphic sarcomatous stroma. (Ann Dermatol 23(S2) S160~S164, 2011)
Sang Gon Kim,Seonghyu Shin,Gun-Ho Jung,Seong-Guk Kim,Chung-Guk Kim,Mi-Ok Woo,Min Ju Lee,Jin-Seok Lee,Beom-Young Son,Woon-Ho Yang,Young-up Kwon,Kang-Bo Shim 한국작물학회 2016 한국작물학회지 Vol.61 No.3
In monsoon climates, persistent shade is a troublesome weather condition with an impact on the growth and yield of corn (Zea mays L.). We imposed 7, 14, 21, and 28 days of consecutive shade (CS) on Gwangpyeongok and P3394 corn hybrids at the beginning of the kernel filling stages. Shade had little impact on leaf area and dry matter accumulation in the stem and leaves. However, dry matter accumulation in the ear was severely reduced by approximately 28% and 53% after 14 and 28 days of CS, respectively. For the components of grain yield, 7 and 14 days of shade did irreparable damage to the number of filled kernels, the kernel number per ear row, and the percent of filled kernels, but did little damage or reversible damage after removal of the shade to the 100-grain weight and the row number per ear. Shade significantly reduced the relative growth rate (RGR) due to a decrease in the net assimilation rate (NAR). These results suggest that source activity limitation by shade during the kernel filling stages leads to the inhibition of sink activity and size. The yield of biomass, ear, and grain logistically declined as the length of CS increased. Probit analysis revealed that the number of days of CS needed to cause 25% and 50% reductions in grain yield were 3.7 and 23.1, respectively. These results suggest that the plant yield loss induced by shade at the beginning of the kernel filling stages is mainly achieved within the first 7 days of consecutive shade.