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황용일,이광현,이승철,하정욱 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.3
고분자당류인 chitosan은 가식성 포장제, 항암제, 생물응집제, 항균물질 등으로 폭넓은 이용성을 갖는다. 다량으로 폐기되고 있는 갑각류의 껍질을 효율적으로 이용하게 위하여 꽃게 껍질에서 chitin을 분리정제한 후 탈아세틸화하여 chitosan을 제조하였다. 제조된 chitosan중에서 분자량 42,000이 Escherichia coli O157:NM에 항균력이 가장 우수하였다. 이들 결과로 부터 각종 식중독균에 대하여 항균력을 조사하였다 항균력시험으로 부터 식중독균 중에서 Gram음성균 보다 양성균에 대하여 효과적이 였으며, Gram음성균 중에서도 균종에 따라 상이한 항균력을 보였다. Chitosan was well known as an available material preparing for edible film, antiturmor agent, biocoagulant, and antimicrobiotics etc. For the effective use of Crustacean shell, chitin was prepared from the shell of Blue crab, and chitosan was made through the deacetylation of above chitin. Prepared chitosan with 42,000 M.W. showed most antibacterial effect for Escherichia coli O157 : NM. From this result, chitosan was tested its antibacterial reaction for some Gram prositive and negative food-poisoning bacteria. Antibacterial effect of chitosan was more higher for Gram positive bacteria than Gram negative bacteria and its antibacterial reactions were different for species of Gram negative bacteria.
치은연하 파절로 치조골 소실을 동반한 상악측절치에서 orthodontic extrusive remodeling후 임플란트 식립을 통한 심미수복 : 증례보고
황수연,손원준,한영철,배광식,백승호,이우철,금기연 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.1
심미적으로 중요한 전치부에서 단일 치아 임플란트를 이용한 보철수복은 임상의에게 새로운 도전과제 중의 하나가 되었다. 그러나 전치부에서 single-unit implant는 식립할 부위의 치조골 상태가 양호해야 하는데 치은연하 파절로 인해 치아 주위에 골 손실이 있는 경우 immediate implant는 심미적으로 문제를 야기할 수 있다. 따라서 본 증례는 "orthodontic extrusive remodeling"을 통해 파절치와 주위 조직을 교정적으로 정출시켜 임플란트 식립을 위한 연조직과 경조직을 증대시킨 후 임플란트 식립을 통해 상악측절치에서 성공적인 심미수복을 이룬 증례에 관한 것이다. The treatment of esthetic areas with single-tooth implants represents a new challenge for the clinician. In 1993, a modification of the forced eruption technique, called "orthodontic extrusive remodelling" was proposed as a way to augment both soft- and hard-tissue profiles at potential implant sites. This case report describes augmentation of the coronal soft and hard tissues around a fractured maxillary lateral incisor associated with alveolar bone loss, which was achieved by forced orthodontic extrusion before implant placement. Through these procedures we could reconstruct esthetics and function in a hopeless tooth diagnosed with subgingival root fracture by trauma.
이승철,황용일 慶南大學校 附設 基礎科學硏究所 1998 硏究論文集 Vol.12 No.-
Glucose oxidase (GOD) catalyzes the oxidation of D-glucose to gluconic acid and hydrogen peroxide. GOD can remove oxygen in the food packaging with its unique characteristics. In this study, we isolated GOD producing mold from soil. Twenty-five fungal producers of GOD were isolated form soil and the most of these strains were identified as Aspergillus niger by the morphological characteristics. Among them, Aspergillus niger KN-15 and KN-22 were confirmed as high GOD producer by plate assay. As a carbon source for GOD production of KN-15 and KN-22, glucose is better than fructose.
이승철,황용일 慶南大學校 附設 基礎科學硏究所 1998 硏究論文集 Vol.12 No.-
Microencapsulation processes are widely used in food industry, including flavors, preservatives, and food additives. We studied the preparation of microencapsulated coffee powder with a spray drying method using wall material as the mixture of gum arabic : maltodextrin (1 :4, w : w). Electron micrographs showed that microencapsulated coffee powders were generally spherical shaped with a diameter 20∼40 ㎛ larger than spray dried coffee powders (diameter 15∼30 ㎛). while freeze dried ones were shown to have an angular shape. In color determination, freeze dried coffee had the nearest values to natural raw coffee, and the microencapsulated coffee had lighter color. Water activity of the microencapsulated coffee was 0.15, and those of freeze dried ones and spray dried ones were 0.16, and 0.18, respectively. With the above results. the microencapsulation process could be applied to coffee for effective preservation of flavor and for long shelf life.
이승철,황용일 경남대학교 환경문제연구소 1994 환경연구 Vol.16 No.-
To develop a new biodegradable detergent, we have isolated a gene encoding wide-range temperature applicable alkaline pretense from Xanthomonas sp. YL-37. Alkaline protease gene was isolated from the gene bank that was prepared from the chromosomal DNA of Xanthomonas sp. YL-37. From the results of agarose gel electrophoresis and restriction enzyme mapping, a 2.7 kb DNA fragment containing the alkaline pretense gene was inserted on the plasmid pUC9. Alkaline pretense activity, produced from E.coli which harboring the plasmid, showed no difference at reaction temperature 20, 30, and 40℃ respectively. This result showed that alkaline pretense produced from E.coli harboring the plasmid was apparently the same as that of Xanthomonas sp. YL-37.
김한수,황용일,이승철 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.3
Microencapsulation processes are widely employed for food industry, including flavors, preservatives, and food additives. We studied the preparation of microencapsulated orange oil powder by spray drying method using wall material as gum arabic. Electron micrographs showed microencapsulated coffee powders were generally spherical shaped with average diameter 35.66㎛ with standard variation of 23.51㎛. The average total oil in spray dried powders was determined as 75.35%, while the average moisture was 3.06%. With above results, microencapsulation process could be applied to flavor for effective reservation and usage variation.