• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.05b
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• pp.132-136
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• 2002

In this paper, aging characteristics of outdoor silicone rubber insulator resulting from the acid rain have been investigated with regards to nitrate ion $({NO_{3}}^{-1})$. For this purpose, silicone rubber was aged by immersing into the nitric solutions with different level pH during 1500 hours and various tests (tracking, $tan{\delta}$, breakdown voltage, SEM, EDS, contact angle) were performed. It was observed that the degradation was increased to pH 2.5 slightly and at pH 1.5 highly. And thus, it could be expected that there is certain critical point between pH 1.5 and 2.5, which leads to throught degradation.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.09a
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• pp.28-33
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• 2001

In this paper, aging characteristics of outdoor silicone rubber insulator resulting from the acid rain have been investigated with regards to nitrate ion ($NO^{-1}_{3}$ ). For this purpose, silicone rubber was aged by immersing into the nitric solutions with different level pH during 1500 hours and various tests (tracking, tan $\delta$, breakdown voltage, SEM, EDS, contact angle) were performed. It was observed that the degradation was increased to pH 2.5 slightly and at pH 1.5 highly. And thus, it could be expected that there is certain critical point between pH 1.5 and 2.5, which leads to throught degradation.

• Korean Journal of Acupuncture
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• v.25 no.3
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• pp.137-146
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• 2008

Objectives : The leaves of Artemisia argyi L. have been used for the treatment of bleeding-related diseases in traditional korean medicine. But the immunological activities with macrophage have not been sufficiently reported. This study is to investigate the immunological bioactivities of the herbal acupuncture solution obtained from leaves of Artemisia argyi L. (AAAS). Methods & Results : Against Nicotine and Acetaldehyde, AAAS increased significantly the production of hydrogen peroxide (H2O2) within mouse macrophage Raw 264.7 cells above the concentration of 10 ${\mu}g/m{\ell}$. AAAS increased significantly the production of nitric oxide (NO) in Raw 264. 7 cells above the concentration of 100 ${\mu}g/m{\ell}$ against EtOH. And AAAS increased significantly the production of nitric oxide (NO) in Raw 264. 7 cells above the concentration of 200 ${\mu}g/m{\ell}$ against Nicotine, Acetaminophen, and Acetaldehyde. Conclusions : These results suggest that AAAS could be thought to have the immunological activities related with the production of hydrogen peroxide and NO in macrophage.

• Journal of Acupuncture Research
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• v.27 no.4
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• pp.223-231
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• 2010

Objectives : The objective of this study is to study the effects of Euonymi Lignum Suberatatum pharmacopuncture solution on NO and IL-6 production in macrophage. Methods : At first, the RAW 264.7 macrophage was subclutured. In order to evaluate cytotoxicity, MTT assay performed. Then, the cell was induced by LPS, INF-$\gamma$ and Experimental groups were divided into five(Normal, Control, Euonymi Lignum Suberatatum 100, 200, $300{\mu}g/m{\ell}$). Then Euonymi Lignum Suberatatum pharmacopuncture solution was put into cell. We measured IL-6, iNOS, NO. Results : The cytotoxic effect of Euonymi Lignum Suberatatum pharmacopuncture solution in RAW 264.7 macrophage was not appeared. $300{\mu}g/m\ell$ Euonymi Lignum Suberatatum pharmacopuncture solution inhibited IL-6 production in LPS, INF-$\gamma$-stimulated RAW 264.7 macrophages significantly. Euonymi Lignum Suberatatum pharmacopuncture solution inhibited iNOS revelation in LPS, INF-$\gamma$-stimulated RAW 264.7 macrophages. All group of Euonymi Lignum Suberatatum pharmacopuncture solution inhibited NO production in LPS, INF-$\gamma$-stimulated RAW 264.7 macrophages significantly. Conclusions : Our study demonstrated that Euonymi Lignum Suberatatum pharmacopuncture solution had an inhibition effect on NO production, iNOS revelation, IL-6 production. So Euonymi Lignum Suberatatum pharmaco puncture solution may have an Anti-inflammation effect.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.11 no.2
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• pp.85-93
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• 2013

This study has been carried out to elucidate the characteristics of the dissolution for Thermal Decomposed Solid Waste of uranium-bearing sludge (TDSW), the removal of impurities by an alkalization in a nitric acid dissolving solution of TDSW, and the selective removal (/recovery) of uranium by an acidification in an carbonate alkali solution, respectively. TDSW generated by thermal decomposition of U-bearing sludge which was produced in the uranium conversion plant operation, was stored in KAERI as a solid-powder type. It is found that the dissolution of TDSW is more effective in nitric acid dissolution than oxidative-dissolution with carbonate. At 1 M nitric acid solution, TDSW was undissolved about 30wt% as a solid residue, and uranium contained in TDSW was dissolved more than 99%. In order to the alkalization for the nitric acid dissolving solution of TDSW, carbonate alkalization is more effective with respect to remove the impurities. At the carbonate alkali solution controlled to about 9 of pH, Al, Ca, Fe and Zn co-dissolved with U in dissolution step was removed about $98{\pm}1%$. On the other hand, U could be recovered more than 99% by an acidification at pH about 3 in a carbonate alkali solution, which was nearly removed the impurities, adding 0.5M $H_2O_2$. It was found that uranium could be selectively recovered (/removed) from TDSW.

• Journal of Acupuncture Research
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• v.24 no.4
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• pp.99-105
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• 2007

목적 : 본 연구는 최근 임상에서 많이 사용하는 자하거 약침액의 nitric oxide(NO)에 대한 소거 효과를 분석하기 위하여 실행되었다. 방법 : 양성대조군으로 비타민C와 실험군으로 자하거 약침액에 NO를 분비하는 S-nitroso-N-acetylpenicillamine(SNAP)을 투여한 후 NO의 농도를 540nm 파장의 자외선 흡수량을 측정하여 평가하였다. 결과 : 실험에 사용된 자하거 약침액의 NO 소거 효과는 강력한 항산화제인 비타민C보다 우수하지는 못하였으나 0.005 및 0.001mg/ml 농도에서 12시간 동안 SNAP를 투여한 후 생성된 NO를 유의성 있게 소거하는 효과가 나타났다. 결론 : 이상의 결과를 통하여 자하거 약침액이 NO를 소거하는 효과가 있는 것이 확인이 되었으나 추후 농도별 실험과 다른 시료와의 비교실험이 더 요구된다.

• Korean Journal of Acupuncture
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• v.28 no.1
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• pp.61-69
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• 2011

Objectives : The purpose of this study is to investigate effects of White Ginseng-Ejung-tang acupuncture solution (EJ) on nitric oxide (NO) and of hydrogen peroxide production in RAW 264.7 mouse macrophages stimulated by lipopolysaccharide (LPS). Methods : Cell viability was measured by modified MTT assay. NO production was measured by Griess reagent assay. Hydrogen peroxide production was measured by dihydrorhodamine 123 (DHR) assay. Significant differences were examined by using a Student's t-test. Results : The results of the experiment are as follows. 1. EJ did not show cell toxicity against RAW 264.7 cells for 24 hr incubation at the concentrations of up to $200\;{\mu}g$/mL in RAW 264.7 cells. 2. EJ significantly inhibited NO production for 24 hr incubation in RAW 264.7 cells (p <0.05). 3. EJ significantly inhibited the LPS-induced production of NO for 24 hr incubation in RAW 264.7 cells (p <0.05). 4. EJ significantly inhibited the LPS-induced production of hydrogen peroxide for 16, 24, 40, 48, 64, and 72 hr incubation in RAW 264.7 cells (p <0.05). Conclusions : These results suggest that EJ has an anti-inflammtory property related with its inhibition of NO and hydrogen peroxide production in LPS-induced macrophages.

• Korean Journal of Acupuncture
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• v.24 no.1
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• pp.189-197
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• 2007

Objectives : Free radical metabolism seems to occupy a remarkably common position in the mechanisms of aging and aging related disease. This study was designed to find out whether Juglandis Semen herbal acupuncture solution (JSHAS) can scavenge Nitric Oxide (NO) or not. Methods : SNAP was used as NO generator. NO concentration was estimated after 2, 6, 12 and 24 hrs in no treatment group, after treatment with Vitamin C or 1, 10, 100 ${\mu}g/ml$ of JSHAS. Results : There was no significant scavenging effect of JSHAS on NO after 2, 6 hrs but significant effect on NO in 10, 100 ${\mu}g/ml$ group. Conclusions : These results suggest that JSHAS has scavenging effect on NO. This study shows that JSHAS can be used for aging related disease and further studies are required to investigate the antioxidative effects of it.

• Fibers and Polymers
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• v.6 no.2
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• pp.108-112
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• 2005

Nanocomposite films were prepared by casting the solution of polyacrylonitrile (PAN) and single wall nanotube (SWNT) in nitric acid subsequent to sonication. Even though SWNT shows good dispersion visually, the reinforcing effect was not satisfactory. The G-band Raman spectra of the drawn film clearly demonstrated that SWNTs in the film are well-oriented along the drawing axis of the film. The electrical resistivity of the film prepared using nitric acid was lower than that of the film using DMF. Thus, nitric acid is presumably more effective in dispersing nanotubes than DMF.

• Membrane Journal
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• v.19 no.4
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• pp.317-323
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• 2009

In this study the nanofiltration (NF) membrane treatment of a nitric acid waste solutions containing $Pb^{+2}$ heavy metal ion discharging from the etching processes of an electronics and semiconductors industry has been studied for the purpose of recycling of nitric acid etching solutions. Three kinds of NF membranes (General Electric Co. Duraslick NF-4040 membrane, Dow Co. Filmtec LP-4040 membrane and Koch Co. SelRO MPS-34 4040 membrane) were tested for their separation efficiency (total rejection) of $Pb^{+2}$ ion and membrane stability in nitric acid solution. NF experiments were carried out with a dead-end membrane filtration laboratory system. The membrane permeate flux was increased with the increasing storage time in nitric acid solution and lowering pH of acid solution because of the enhancing of NF membrane damage by nitric acid. The membrane stability in nitric acid solution was more superior in the order of Filmtec LP-4040 < Duraslick NF-4040 < SelRO MPS-34 4040 membrane. The total rejection of Pb+2 ion was decreased with the increasing storage time in nitric acid solution and lowering the pH of acid solution. The total rejection of $Pb^{+2}$ ion after 4 months NF treatment was decreased from 95% initial value to 20% in the case of Duraslick NF-4040 membrane, from 85% initial value to 65% in the case of SelRO MPS-34 4040 membrane and from 90% initial value to 10% in the case of Filmtec LP-4040 membrane. These results showed that SelRO MPS-34 4040 NF membrane was more suitable for the treatment of an acidic etching waste solutions containing heavy metal ions.