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Bone Morphogenic Protein-2 (BMP-2) Immobilized Biodegradable Scaffolds for Bone Tissue Engineering
Kim, Sung-Eun,Rha, Hyung-Kyun,Surendran, Sibin,Han, Chang-Whan,Lee, Sang-Cheon,Choi, Hyung-Woo,Choi, Yong-Woo,Lee, Kweon-Haeng,Rhie, Jong-Won,Ahn, Sang-Tae The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.5
Recombinant human bone morphogenic protein-2 (rhBMP-2), which is known as one of the major local stimuli for osteogenic differentiation, was immobilized on the surface of hyaluronic acid (HA)-modified poly$(\varepsilon-caprolactone)$ (PCL) (HA-PCL) scaffolds to improve the attachment, proliferation, and differentiation of human bone marrow stem cells (hBMSCs) for bone tissue engineering. The rhBMP-2 proteins were directly immobilized onto the HA-modified PCL scaffolds by the chemical grafting the amine groups of proteins to carboxylic acid groups of HA. The amount of covalently bounded rhBMP-2 was measured to 1.6 pg/mg (rhBMP/HA-PCL scaffold) by using a sandwich enzyme-linked immunosorbant assay. The rhBMP-2 immobilized HA-modified-PCL scaffold exhibited the good colonization, by the newly differentiated osteoblasts, with a statistically significant increase of the rhBMP-2 release and alkaline phosphatase activity as compared with the control groups both PCL and HA-PCL scaffolds. We also found enhanced mineralization and elevated osteocalcin detection for the rhBMP-2 immobilized HA-PCL scaffolds, in vitro.
Cutaneous Focal Mucinosis Arising From the Chin
Lee, Woo Sung,Lee, Jung Ho,Oh, Deuk Young,Seo, Je Won,Rhie, Jong Won,Ahn, Sang Tae Mutaz B. Habal, MD 2010 JOURNAL OF CRANIOFACIAL SURGERY - Vol.21 No.5
Cutaneous focal mucinosis is a type of degenerative-inflammatory dermal mucinoses characterized with asymptomatic, single, dermal mucin deposition. Because of its rarity, it is often mistaken clinically for other disorders such as sebaceous cyst, fibroma, myxoma, and xanthoma. In this study, we will discuss a case of cutaneous focal mucinosis arising from the chin of a 27-year-old man.
Jung, Sung-No,Rhie, Jong Won,Kwon, Ho,Jun, Young Joon,Seo, Je-Won,Yoo, Gyeol,Oh, Deuk Young,Ahn, Sang Tae,Woo, Jihyoun,Oh, Jieun Mutaz B. Habal, MD 2010 JOURNAL OF CRANIOFACIAL SURGERY - Vol.21 No.2
Human adipose-derived mesenchymal stem cells (MSCs) were differentiated into chondrogenic MSCs, and fibrin glue was used together to explore the feasibility of whether cartilages can be generated in vivo by injecting the differentiated cells. Mesenchymal stem cells extracted from human adipose were differentiated into chondrogenic MSCs, and such differentiated cells mixed with fibrin glue were injected subcutaneously into the back of the nude mouse. In addition to visual evaluation of the tissues formed after 4, 8, and 12 weeks, hematoxylin-eosin staining, Masson trichrome staining, measurement of glycosaminoglycan concentration using dimethylmethylene blue, agreecan through reverse transcriptase-polymerase chain reaction, type II collagen, and expression of SOX-9 were verified. Moreover, the results were compared with 2 groups of controls: 1 control group that received only injection of chondrogenic-differentiated MSC and the supporting control group that received only fibrin glue injection. For the experimental group, cartilage-like tissues were formed after 4, 8, and 12 weeks. Formation of cartilage tissues was not observed in any of 4, 8, and 12 weeks of the control group. The supporting control group had only a small structure formation after 4 weeks, but the formed structure was completely decomposed by the 8th and 12th weeks. The range of staining dramatically increased with time at 4, 8, and 12 weeks in Masson trichrome staining. The concentration of glycosaminoglycan also increased with time. The increased level was statistically significant with more than 3 times more after 8 weeks compared with 4 weeks and more than 2 times more after 12 weeks compared with 8 weeks. Also, in reverse transcriptase-polymerase chain reaction at 4, 8, and 12 weeks, all results expressed a cartilage-specific gene called aggrecan, type II collagen, and SOX-9. The study verified that the chondrogenic-differentiated MSCs derived from human adipose tissues with fibrin glue can proliferate and form new cartilage. Our findings suggest that formation of cartilages in vivo is possible.
이예림(Ye Lim Rhie),김용민(Yong Min Kim),안성희(Sung Hee Ahn),오진우(Jin Woo Oh),안명환(Myong Hwan Ahn),윤명환(Myung Hwan Yun) 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2
콘솔은 시스템의 제어를 위한 제어장치와 표시장치로 구성된 유저 인터페이스(user interface)의 집합체로, 잠수함에 탑재되는 콘솔은 두 개의 디스플레이와 다수의 콘트롤 인터페이스로 구성된다. 인적 오류에 대한 경각심이 높아짐에 따라 인간공학적 콘솔 설계에 대한 연구들이 진행되었으나, 기존 연구는 대부분 인종에 따른 신체 특성을 고려하지 않았고, 최적 설계수치보다는 최소 요구조건을 세우는데 목표를 두었다. 따라서 본 연구는 한국인들의 신체적 특성과 과업 특성, 환경적 제약 등을 고려하여 최적 설계수치를 제안하였다. 또한 과업 수행 시 신체적 피로도와 반응시간을 측정하여 적절성을 검증하였다.
Molecular Cloning of Plasmodium vivax Calcium-Dependent Protein Kinase 4
Kyung-Mi Choi,Jung-Yeon Kim,Sung-Ung Moon,Hyeong-Woo Lee,Jetsumon Sattabongkot,Byoung-Kuk Na,Dae-Won Kim,Eun-Jung Suh,Yeon-Joo Kim,Shin-Hyeong Cho,Ho-Sa Lee,Ho-Gun Rhie,Tong-Soo Kim 대한기생충학열대의학회 2010 The Korean Journal of Parasitology Vol.48 No.4
A family of calcium-dependent protein kinases (CDPKs) is a unique enzyme which plays crucial roles in intracellular calcium signaling in plants, algae, and protozoa. CDPKs of malaria parasites are known to be key regulators for stage-specific cellular responses to calcium, a widespread secondary messenger that controls the progression of the parasite. In our study, we identified a gene encoding Plasmodium vivax CDPK4 (PvCDPK4) and characterized its molecular property and cellular localization. PvCDPK4 was a typical CDPK which had well-conserved N-terminal kinase domain and C-terminal calmodulin-like structure with 4-EF hand motifs for calcium-binding. The recombinant protein of EF hand domain of PvCDPK4 was expressed in Echerichia coli and a 34 kDa product was obtained. Immunofluorescence assay by confocal laser microscopy revealed that the protein was expressed at the mature schizont of P. vivax. The expression of Pv-CDPK4-EF in schizont suggests that it may participate in the proliferation or egress process in the life cycle of this parasite.