• Journal of Periodontal and Implant Science
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• 제41권2호
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• pp.73-78
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• 2011

Purpose: For periodontal tissue engineering, it is a primary requisite and a challenge to select the optimum types of cells, properties of scaffold, and growth factor combination to reconstruct a specific tissue in its natural form and with the appropriate function. Owing to fundamental disadvantages associated with using a two-dimensional substrate, several methods of seeding cells into three-dimensional scaffolds have been reported and the authors have asserted its usefulness and effectiveness. In this study, we explore the cell attachment of periodontal ligament fibroblasts on nanohydroxyapatite (n-HA) scaffold using avidin biotin binding system (ABBS). Methods: Human periodontal ligament fibroblasts were isolated from the health tooth extracted for the purpose of orthodontic procedure. HA nanoparticles were prepared and $Ca(NO_3)_2-_4H_2O$ and $(OC_2H_5)_3P$ were selected as precursors of HA sol. The final scaffold was 8 mm in diameter and 3 mm in height disk with porosity value of 81.55%. $1{\times}10^5$ periodontal ligament fibroblasts were applied to each scaffold. The cells were seeded into scaffolds by static, agitating and ABBS seeding method. Results: The number of periodontal ligament fibroblasts attached was greater for ABBS seeding method than for static or agitating method (P<0.05). No meaningful difference has been observed among seeding methods with scanning electron microscopy images. However, increased strength of cell attachment of ABBS could be deduced from the high affinity between avidin and biotin ($Kd=10^{-15}\;M$). Conclusions: The high-affinity ABBS enhances the ability of periodontal ligament fibroblasts to attach to three-dimensionally constructed n-HA scaffold.

• 유통과학연구
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• 제13권1호
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• pp.93-103
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• 2015

Purpose - This study plans to adopt a more sophisticated approach toward service recognition by customers in general supermarkets in order to revise the service quality measurement methods that suit the context of Korean distribution channels. In particular, in general supermarkets, where much of the shopping process is in the form of self-service, there is high reliance on the service recognized by the consumers; therefore, it is highly likely that consumers would make their purchasing decisions based on their recognition of service quality or guarantees. It also utilized service quality elements of a basic level in the KD-SQS development model in order to indicate that the quality recognized by consumers impacts their loyalty to the stores with financial value and abstract value. Research design, data, and methodology - The study suggested a theoretical model comprising 13 hypotheses on relations between theoretic variables, and conducted surveys with consumers using discount stores in Seoul and Gyunggi Metropolitan area in order to verify the hypotheses, while using SPSS 20.0, AMOS 21.0 as the verification program. The survey sheets used amounted to 332, and a structural equation model was used to analyze the reliability and validity of constituent elements and to verify the suggested hypothesis. Therefore, this study analyzes the interrelations between service quality and guarantee factors in the distribution channel and their relations with the loyalty to stores as a dependent variable. Results - First, the results of the hypotheses tests helped identify the relations between service quality, service guarantees, service value, and customer loyalty, providing an opportunity to define the relations between constituent elements. In particular, service convenience in service quality has no impact on financial values. Further, stores' service policy had no impact on abstract values. Service recognition by service convenience has an impact on abstract values such as good image, comfort, and usability, while mileage systems promote financial values for consumers. In order to improve consumer values in service quality and values, general supermarkets should improve their service convenience, membership, and mileage programs using various strategies. Conclusion - In order to improve consumer values in service quality and values, general supermarkets should improve their service convenience, membership, and mileage programs using various strategies. Further, as service guarantee systems have a significant and direct impact on customer loyalty, rather than customer value recognition, service guarantees should be used to encourage customers to re-visit the stores. Finally, this study applied the findings of preceding studies in terms of service quality measurement; it had limitations in referencing preceding studies in a comprehensive manner. It also had limits in expanding upon various preceding studies because it was difficult to apply new measurement tools due to the lack of service quality measurement tools for general supermarkets. Therefore, it is necessary to conduct more studies on service quality to measure service quality and develop measurement tools by incorporating various industry characteristics.

• Biomolecules & Therapeutics
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• 제3권4호
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• pp.266-272
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• 1995

The analysis of membrane receptors for hormones and neurotransmitters has progressed considerably by pharmacological and biochemical means and more recently through the use of specific antibodies. To generate and characterize a moloclonal antibody against $\beta$-adrenergic receptor, a synthetic $\beta$2-adrenergic receptor peptide (Phe-Gly-Asn-Phe-Trp-Cys-Phe-Trp-Thr-Ser-lle-Asp-Val-Leu) which may comprise part of $\beta$-adrenergic receptor ligand binding pocket was coupled to Keyhole Limpet Hemocyanin (KLH) and used as an immunogen. Male BALB/C mice were immunized with this antigen and the immunized spleen was fused with myeloma SP2/0-Ag14 cells to produce monoclonal antibodies. Two clones were obtained but one of monoclonal antibodies, mAb5G09, was used throughout in this study because the other clone, mAb5All showed weak immunoreactivity against KLH as well. The mouse monoclonal antibody mAb5G09 produced in this study showed immunoreactivity to peptide-KLH conjugates and also to human A43l cells and guinea pig lung $\beta$2-adrenergic receptor as revealed by ELISA and western blot. In the course of determination of the effects of mAb5G09 on $\beta$-receptor ligand binding, it was observed that mAb5G09 specifically bound $\beta$-adrenergic radioligand [$^3$H]dihydroalprenolol (DHA) with a dissociation constant (Kd) of 60 nM. The [$^3$H]DHA binding activity of mAb5G09 had characteristics of immunoglobulins and the binding activity was not observed in the control anti-KLH monoclonal antibody. The monoclonal antibody, mAb5G09 produced in this study may provide useful models for the study of the structure of receptor binding sites.

• Pediatric Infection and Vaccine
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• 제21권1호
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• pp.29-36
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• 2014

목적: 이 연구의 목적은 면역글로불린-저항성 가와사키병의 예측 인자를 찾고 점수화된 예측 모델을 만들고자 하는 것이다. 방법: 2009년 1월부터 2012년 12월까지 세브란스 어린이 병원에서 가와사키병으로 진단된 573명의 환자를 대상으로 하였다. 실험군과 검증군으로 나누었고, 각 군들은 면역글로불린-반응성과 저항성으로 나누었다. 실험군에서 면역글로불린의 예측 인자를 찾았고, 점수화된 예측모델을 만들었다. 그리고 외적, 내적 타당성 검증을 시행하였다. 결과: 남성, 경부림프절종대, 손과 발의 변화, 혈소판, 총빌리루빈, 젖산탈수효소, CRP가 면역글로불린-저항성 가와사키병의 예측 인자로 나타났다. 점수화된 예측 모델을 만들었고, 민감도와 특이도가 실험군에서는 52.5%와 82.4%, 검증군에서는 37.8%와 81.8%로 나타났다. 결론: 우리의 점수화된 예측 모델은 한국 환자에 적용하였을 때 높은 특이도와 낮은 민감도를 갖는다.

• Applied Biological Chemistry
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• 제47권3호
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• pp.315-320
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• 2004

본 연구는 장기능 개선 및 변비 질환의 예방 및 치료에 효과적인 천연 식품인 무(Raphanuse sativa var. nigra L.)로부터 추출, 정제된 조성물, 보다 상세하게는 무의 물 추출물에서 정제 분획된 분자량 3-10 kDa가 주성분으로 장기능 및 변비 질환의 개선 효과를 가지는 조성물에 관한 것이다. 무의 물 추출물을 Balb/c mice를 이용한 활성탄 식이의 장 이동 효과와 SD rats를 이용한 loperamide-induced constipation method에 의한 항변비 효과를 검색하였다. 또한 항변비 효과 검색을 종료한 후, 희생한 횐쥐의 대장관 내 점액질 분비 효과를 조사하였다. 특히, 대장에 많이 존재하는 MUC2 분비 효과를 알아보고자 하였다. 무의 물 추출물은 식수만 투여한 대조군에 비해 용량에 비례해서 활성탄 식이의 장 이동 효과가 현저하게 증가되었고, 다양한 용매 분획에서는 무의 물 분획이 가장 큰 장 이동 효과를 나타내어, 물 분획이 장 이동을 촉진시키는 활성 물질이 가장 많이 함유된 분획으로 확인할 수 있었다. 또한 물 분획을 분자량 크기로 3 kDa 이하, 3-10 kDa, 10-300 kDa, 300 kDa 이상의 4가지 세 분획으로 나누어 활성탄 식이의 장이동 효과를 조사한 결과, 이들 세 분획중에서 3-10 kDa의 분자량을 가진 분획이 주요 구성 물질로 장 이동 촉진 효과를 보였다. Loperamide를 이용해 3-10 kDa의 변비해소 작용을 알아 본 결과에서도 무 물세분획(3-10 kDa) 투여로 변비 유발기간 내내 변량이 증가되었으며, 변비 유발군에 비해, 사료 섭취량의 증가는 변비 유발 물질인 loperamide를 계속 섭취함에도 불구하고 변비가 해소되고 있음을 확인할 수 있었다. 무 물세분획(3-10 kDa)의 대장관내 점액질의 분비에 미치는 영향을 조사한 결과에서도, 대장관 내 변의 개수가 정상군과 거의 같은 수준의 변 개수가 관찰되어 배변촉진 효과가 확인 되었고, 항체(Biogenex AM358)를 사용하여 면역조직 화학법으로 MUC2 관찰시, 변비 유발군에서는 MUC2로 염색된 세포가 현저하계 감소되나, 무 물세분획(3-l0 kDa) 투여시 뚜렷하게 MUC2 염색이 증가되었다.