• 박물관보존과학
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• 제12권
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• pp.77-88
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• 2011

국립청주박물관 소장 숙명신한첩(보물 제 1629호)에 수록된 66편의 편지에 대한 보존처리 및 섬유조사를 실시하였다. 처리 전 상태는 표지가 결실되었고 본지는 습해에 의한 얼룩, 충해에 의한 결실 등의 손상이 많았으며 효종대왕 어서 1편은 별도의 액자에 보관되어 있었다. 첩을 해체하여 구 배접지 제거 후 낱장 분리된 편지에 대한 지질조사와 C-stain법을 이용한 섬유분석을 하였으며, 보존처리는 편지와 테두리의 결실부위 보수 후 액자로 분리되어 있는 편지 1편을 포함하여 전체를 하나의 첩으로 재 장황하였다.

• 한국의류산업학회지
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• 제14권3호
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• pp.492-500
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• 2012

Cocoa is a popular drink for children and contains healthy polyphenols however; a deep brown stain is left when cocoa is spilled over clothes. The main pigments in cocoa are anthocyanins that change in washing solutions with different alkalinity and metals. The removal and color changes in a cocoa stain after washing with various pH solutions and water hardness were studied. Alkalinity and the water hardness of washing solutions were important factors for the removal of cocoa stains. The removal of cocoa things in washing solutions without detergent was low (and even became negative after removal and darker) in solutions with a pH 9 and above. The cocoa stain was not removed and only the fabric color faded, although the cocoa stained cloth was washed with Korea tap water that has a pH of 7. The cocoa stain removal in detergent solutions was conspicuously higher than for only water. Even in detergent solutions, the cocoa stain removal decreased as water hardness increased. Cocoa stain removal was more effective and the color dimmest when the stained cloth was washed in a solution without the metal cations, and the bleach added with the detergent at a temperature of $40^{\circ}C$ and for longer than 20 minutes. Effective and economical equipment for tap water softening for a washing machine should be developed and used to improve cocoa stain removal.

• 공업화학
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• 제5권3호
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• pp.419-424
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• 1994

금속공작유에 의해 발생하는 기름얼룩에 대하여 6종의 유지화합물(rapeseed oil, oleic acid, methyl oleate, oleyl alcohol, lauryl amine, lanolin)에 따른 영향을 조사하였다. 시험방법으로는 MIL-C-22235A의 방법을 사용하였으며 base oil(spindle oil; 1.5wt%의 황함유)에 유지화합물 10wt%와 항산화제 0.5wt%를 첨가시켜 도유용 sample을 만들었다. 시험결과 항산화제 중 B. T가 B. H. T.와 T. C. P보다는 기름얼룩 억제에 효과적이었으며, 산가는 기름얼룩 방지에 나쁜 영향을 미쳤다. 유지화합물의 화학구조에 의해 예견되는 바와 같이 oleic acid는 철이온과 반응이 가능하므로 시편에 심하게 기름얼룩을 발생시켰다.

• 대한한의학회지
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• 제24권2호
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• pp.204-212
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• 2003

Current therapy for acute ischemic stroke is highly focused on neuroprotective agents, and many herbal medicines have been challenged for experimental models. The aim of this study is to investigate whether Angelicae gigantis Radix can protect nerve cells against ischemic neural damage of middle cerebral artery occlusion (MCAO) in rats' brains. Rats were treated with Angelicae gigantis Radix immediately after 2 hours of MCAO for 7 days. On the 7th day, the brains of the rats were sliced through the hippocampus and dyedby c-Fos immunohistochemistry stain and cresyl violet stain for microscopic examination. The number of viable neurons and c-Fos immunoreactive cells in CA1 regions was counted. MCAO caused significant decrease in density of neurons and c-Fos immunoreactive cells compared to those of sham-operated rats. Administration of Angelicae gigantis Radix significantly elevated MCAO-induced decrease in density of neurons and c-Fos immunoreactive cells. These results suggest that the neuroprotective effect of Angelicae gigantis Radix against focal cerebral ischemia is related to c-Fos gene expression. Thus, these findings indicate that Angelicae gigantis Radix can be used for treatment and prevention of cerebral ischemia.

• 펄프종이기술
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• 제47권6호
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• pp.41-48
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• 2015

Fiber identification was attempted for the early twenty century documents that were classified as national archives in Korea, as an initial step for establishing scientific preservation and restoration method. Fiber staining with C stain and a digital microscope were used for the observation. All the documents observed consisted of mostly softwood fibers from fir (Abies) and other minor supplementary fibers, and they were all deteriorated seriously by various damages and aging process. It seemed that at around 1914-1934, fir was used frequently as papermaking raw material.

• Journal of Nutrition and Health
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• 제1권3_4호
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• pp.201-205
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• 1968

The authors has observed the histopathologically and histochemically on the effect of the garlic and garlic oil to the liver and kidney of rats. In order to confirm the histochemical changes of the metabolism of polysaccarides, the periodic acid Schiff reaction was applied. The 30 albino adult male rats weighing about 150 grames from the National Institute of Health were housed individualy and devide into 3 experimental groups: Group C: stock diet group Group B: stock diet-garlic group Group A: stock diet-garlic oil group Group C was fed with stock diet only through out this experimental period, Group B was fed with stock diet supplemented with garlic homogenator to be 1%, and Group A was fed with stock diet supplemented with the garlic oil to 0.05%. The garlic oil used in this experiments was extracted by author. And all rats was fed during 10 weeks. The histopathological and histochemical results were shown in each figure. According to the all results, the following concIusions were drawn. 1) In the garlic oil administrated groups, congestion of the sinusoid was subsided and the liberation of the Kupffer's cells were observed. 2) In garlic administrated groups, fatty metamorphosis in hepatic cells, and slight liberation of Kupffer's cells in sinusoidal walls were observed. Connective tissue proliferation and collagen bundle were observed. 3) The connective tissue and blood vessel wall in portal area Were reacted intensely with PAS stain. The hepatic cells Were reacted intensely with PAS stain in control group and moderately or slightly in garlic and garlic oil administrated group. 4) There were no significant differences in collecting and Henle's loops in each groups, but narrowing of lumen of the distal tubules were observed in garlic oil administrated group. 5) The basement membrane of the tubules and the connective tissues of the vessel wall in Kideny were reacted intensely with PAS stain in each groups. In control and garlic administrated groups. the brush border of the proximal tubules were reacted intensely with PAS stain, but epithelium of the Heine's loop, proximal, distal and collecting tubules were reacted moderately. In garlic oil administrated-group, there were tendency of decreasing of PAS stain in each tubules.

• 한국응급구조학회지
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• 제10권1호
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• pp.51-60
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• 2006

Background: The toxicity of paraquat has been known to be caused by oxygen free radicals which leads to the lipid peroxidation and multiple organ failure. High dose vitamin C has been known to be a effective antioxidant activities against the paraquat intoxication. This study was designed to evaluate the effect of regular injection of high dose vitamin C on liver damage in paraquat poisoned rat model. Method: Fifty five rats of Sprague-Dawley strain were divided into three groups: control group, only intraperitoneally injected saline; paraquat group, single dose intraperitoneally injected paraquat(24.5%, 40 mg/kg) and every 8 hours injected saline; paraquat and vitamin C group, single dose intraperitoneally injected paraquat(24.5%, 40 mg/kg) and every 8 hours injected vitamin C(72 mg/kg). Rats were sacrificed on the 12 hours, 1st day, 2nd day, 4th day, 7th day after injection and liver tissue was obtained. H&E(Hematoxylin & Eosin) stain and Masson's trichrome stain for collagen fiber detection were undertaken. The results were observed using the microscope. Results: 1. There were no differences between control and experimental group at the 12hours after regular injection of high dose vitamin C. 2. There were significantly decreased liver damage in experimental group in the 1st day after regular injection of high dose vitamin C. 3. There were significantly increased recovery of liver damage with time in experimental group after regular injection of high dose vitamin C. Conclusion: These results suggest that regular injection of high dose vitamin C is effective in decreasing liver damage in paraquat intoxication.

• Journal of the Korean Wood Science and Technology
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• 제14권1호
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• pp.55-60
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• 1986

Discoloration sensitivities of woods grown in this country haven't reported yet. Therefore we examined discoloration sensitivities of domestic wood specimens to iron (0.1 %, $FeCl_3.6H_2O$), alkali (pH 12.0, NaOH). acid (pH 1.0, $C_2H_2O_4$) and exposing to sunlight (40 hrs), Thirty-six hardwood species were collected and examined. All specimens were prepared from heartwoods of the collected species. But the specimens of 4 Betula species were divided into sapwoods and heartwoods. By iron stain, the color differences (${\Delta}E$) of 21 wood specimens including one Betula sapwood showed above 12.0, which means strong discoloration sensitivities, and of 3 specimens including one Betula sapwood showed below 2.5, which means weak discolorations. The most strong iron discoloration species was Jungkukgulpi-namu (Pterocarya stenoptera). By alkali stain, the color differences (${\Delta}E$) of 3 wood specimens showed above 9.0, which means strong discoloration sensitivities, and of 18 wood specimens including 4 Berula sapwoods showed below 2.5, which means weak discolorations. By acid stain, the color differences (${\Delta}E$) of 6 wood specimens showed above 10.0 which means strong discoloration sensitivities, and of 12 wood specimens including one Betula sapwoods showed below 2.5, which means weak discolorations. By exposing to sunlight, the color differences (${\Delta}E$) of 31 wood specimens including one Betula sapwoods showed below 6.5, which means, strong discoloration sensitivities, and of only one specimens showed below 2.5, which means weak discoloration. The most strong discoloration species by exposing to sunlight was Guirung-namu (Prunus padus). In general, it was shown that hardwoods grown in Korea were most subject to change of color by exposing to sunlight and next were by iron stain. Domestic hardwoods showed some differences in discoloration sensitivities from domestic softwoods previously reported.

• Journal of the Korean Wood Science and Technology
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• 제51권5호
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• pp.410-418
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• 2023

In this study, the combustion characteristics of the Tulip tree, which is the representative broad-leaved afforestation tree in Korea, were analyzed. The flame retardant performance of the Tulip tree was analyzed by analyzing combustion characteristics on a total of three test samples; flame retardant treated, both flame retardant and oil stain-treated, and untreated. Then the flame retardance grade was classified for each of them. According to the result, test samples showed the strongest flame retardance were in order of flame retardant treated (C), both flame retardant and oil stain-treated (B), and untreated (A). As a result of analyzing the total heat emission and maximum heat emission rates, which is the evaluation standard for interior materials of Korean domestic buildings, test samples with flame retardant treat or flame retardant and oil stain treat were qualified for the flame-retardant standard. Both flame retardant and oil stain-treated samples showed higher total heat release (THR) and heat release rate compared to flame retardant-treated samples as the oil causes combustion with oxygen. On the other hand, they didn't qualify the THR in Quasi-non-combustible standards. To determine the correlation between the physical and combustion characteristics of wood, the combustion characteristics of other diffuse porous wood species, with which the Tulip tree is affiliated were analyzed, and noticed that the characteristic correlates with the density and quantity of wood. The results of this study are expected to be used as basic information on the combustion characteristics of the Tulip tree.

• 치위생과학회지
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• 제13권2호
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• pp.191-196
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• 2013

본 연구는 미백치약의 효능을 확인하고 미백치약으로 미백된 치아의 식음음료에 따른 재착색의 정도를 확인하고자 실시되었다. 30개의 치아를 두 그룹으로 나누어 미백치약의 효능을 평가하였고 평가된 치아는 다시 착색음료에 담가 색변화를 관찰하였다. 그 결과, 미백치약은 사용한지 21일부터 일반치약을 사용한 치아와의 색변화에서 유의한 차이를 확인할 수 있었다(p>0.05). 미백된 치아의 재착색에서는 오렌지주스에 담군 치아가 가장 색변화가 크고 분명하였으나 일반치약을 사용한 치아와 유의한 차이를 보이지는 않았다(p>0.05). 커피와 녹차에 담근 치아는 각각 15일, 5일부터 유의한 차이를 보였으며 (p>0.05), 녹차에 담근 치아가 음의 색변화가 더 높은 것으로 나타났다. 따라서, 본 실험에 사용된 대표적인 3개의 식음음료 중 커피와 녹차에서 미백된 치아에서 더 착색이 잘 일어나는 것을 확인하였다.