• Restorative Dentistry and Endodontics
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• 제20권2호
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• pp.832-838
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• 1995

The purpose of this study was to evaluate the amount of marginal microleakage of 2 light curable GI cements(Fuji II LC & VariGlass), which contain some resin components. 4 volunteers kept on acrylic resin plates, which contained dentin disks with cavities filled with test materials for 2 weeks. The time when polishing was done(5 minutes and 24 hours after filling) and the use of protective agents were varied, so 8 groups with each 6 specimens were tested. After having specimens(disks with cavities filled with materials) penetrated with 1% Methylene Blue solution, specimens were stored in 40% nitric acid solution for 4 days to extract adsorbed dye material. Supernatants of centrifuged samples were diluted 5 times and Spectrophotometer was used to determine the degree of absorption. Dye concentration was calculated through the pre-obtained Linear Regression Curve. The results were as follows. 1. The best result was seen in groups (PF24, PV24) which were protected and polished 24 hours later and the opposite phenomenon was seen in groups(NF24, NV24) which were held without protection and polished 24 hours later. Groups polished S minutes later showed moderate leakage pattern. 2. Groups polished 5 minutes later showed similar leakage amount irrespective of using of protective agent. But statistically insignificant lower values were seen in VariGlass than in Fuji II LC groups, So It was considered that VariGlass may be more resistant to early moisture attack than Fuji II LC. 3. In groups polished 24 hours later, there was no significant difference between materials but was definitely significant difference according to the use of protective agent. If the cement in which polishing will be done 24 hours later, Protective agent should be used to cover the surface.

• 한국유기농업학회지
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• 제24권4호
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• pp.945-955
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• 2016

지금까지 주요 식물병원세균에 대한 방제대책은 화학적 방제방법에 의존하여왔다. 그러나 항생제와 같은 화학적 방제방법은 저항성 균주의 출현으로 인해 효율성이 감소함에 따라 대체방법의 개발이 요구되어지고 있는 실정이다. 따라서 본 연구에서는 주요 7종(그램음성 - 무름병, 감귤 궤양병, 풋마름병, 가지검은마름병 및 과실썩음병; 그램 양성 - 토마토 궤양병 및 더뎅이병)의 식물병원세균에 대한 탄닌산 함유 친환경농자재(공시번호 2-4-064)의 억제효과를 고체배지 확산법과 액체배지 배양법으로 검정하였다. 고체배지 확산법에서는 가지검은마름병원세균을 제외한 6종의 병원세균에 대한 억제효과를 나타내었으며, 액체배지 검정에서는 액체배지법으로 실험가능한 6종의 병원세균의 생장을 억제하였다. 전자현미경을 통한 표면변화를 관찰한 결과, 모든 병원세균의 표면구조의 변화를 발생하여 생장저해 또는 세포사멸을 유도하는 현상이 관찰되었다.