• 한국약용작물학회지
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• 제3권3호
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• pp.233-239
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• 1995

산채막(山菜莫)(Cornus officinalis Sieb. et Zucc. )의 조직배양(組織培養)을 위한 기초적(基礎的) 연구(硏究)로서 체배양(諦培養)에 미치는 배지(培地), 생장조절제(生長調節劑), 저온(低溫) 전처리(前處理), 배양온도(培養溫度) 및 광(光)의 영향(影響)을 검토(檢討)한 결과(結果)는 다음과 같다. 1. 캘러스 형성율(形成率)은 MS배지(培地)보다 WPM배지(培地)에서 좋은 반응(反應)을 보였으며, Img/L NAA를 첨가(添加)한 WPM배지(培地)에서 54%로 가장 높았고, 캘러스 생장(生長)은 2mg/L NAA를 첨가(添加)한 MS배지(培地)에서 좋았다. 2. 약(約)의 배양온도(培養溫度) 및 광(光)의 영향(影響)은 $25^{\circ}C$, 16시간 명배양(明培養)이 62%의 가장 높은 캘러스 형성율(形成率)을 보였다. 3. 캘러스 형성(形成)에 미치는 약(約)의 저온(低溫) 전처리(前處理) 효과(效果)는 $4^{\circ}C$, 36시간 처리(處理)에서 19.5%로 가장 높았다. 4. 기관분화(器官分化)를 위한 적정배지(適正培地)로는 0. 5mg/L 2, 4-D와 1mg/L kinetin을 첨가(添加)한 MS배지가 녹점형성(綠點形成) 및 뿌리분화를 촉진(促進)하였다. 5. 캘러스 양변화(楊變化) 방지(防止)를 위하여는 3-5mg/L ABA 와 5mg/L $AgNO_3$의 첨가(添加)가 효과적이었으며, 캘러스 활력(活力)이 높아 녹점형성(綠點形成)을 촉진(促進)하였다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.317-317
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• 2011

Water dissociation on oxide surface has been researched in many fields because of its importance as fundamental phenomenas. MgO(001) is a good model system to understand heterogeneous catalysis, gas sensors, ground-water contaminants, and atmosphere chemistry. Over decades, ultrathin film of MgO on Ag(100) have attracted research activities thanks to its enhanced catalytic property. Correlation of the oxide and the metal, potential screening, charge fluctuation from interface reconstruction makes different energetics of hydroxylation of waters on film. We calculate the water-spliting energetics under the vacuum system.

• Journal of Plant Biotechnology
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• 제36권2호
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• pp.137-143
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• 2009

An efficient system for high frequency plant regeneration was established through investigating various factors such as plant growth regulator combinations, explant types and ages, and addition of $AgNO_3$ influenced on shoot regeneration in Brassica juncea L. cv. BARI sarisha-10. Murashige and Skoog (MS) medium supplemented with 0.1 mg/L NAA (1-naphthaleneacetic acid) and 1 mg/L BA (6-benzyladenine) showed the maximum shoot regeneration frequency (56.67%) among the different combinations of NAA and BA. Explant type, explant age, and addition of $AgNO_3$ also significantly affected shoot regeneration. Of the four type of explants (cotyledon, hypocotyl, root, and leaf explants)- cotyledon explants produced the highest shoot regeneration frequency and hypocotyls explants produced the highest number of shoots per explant, whereas root explants did not produce any shoot. The cotyledonary explants from Four-day-old seedlings showed the maximum shoot regeneration frequency and number of shoots per explant. Shoot regeneration frequency increased significantly by adding $AgNO_3$ to the medium. Two mg/L $AgNO_3$ appeared to be the best for shoot regeneration with the highest shoot regeneration frequency (86.67%) and number of shoots per explant (7.5 shoots). Considerable variation in shoot regeneration from cotyledonay explants was observed within the B. juncea L. genotypes. The shoot regeneration frequency ranged from 47.78% for cv. Shambol to 91.11% for cv. Rai-5. In terms of the number of shoots produced per explant, B. juncea L. cv. Daulot showed the maximum efficiency. MS medium supplemented with 0.1 mg/L NAA showed the highest frequency of rooting. The regenerated plantlets were transferred to pot soil and grown to maturity in the greenhouse. All plants were fertile and morphologically identical with the source plants.

• 대한화학회지
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• 제47권2호
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• pp.115-120
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• 2003

Perfluorinated sulfonated polymer(Nafion)-ethylenediamine(en)이 화학수식된 유리탄소전극으로 Fe(II) 이온의 정량에 대해 연구하였다. Fe(II) 이온의 착화제인 en을 nafion에 고정시켜 유리탄소전극 표면에 수식하면 이 수식전극의 en은 Fe(II) 이온과 $[Fe(en)_3]^{+2}$의 착물을 형성한다. Nafion-en이 화학수식된 유리탄소전극에서 시차펄스전압전류법에 의한 Fe(II) 이온의 산화봉우리전위는 0.340${\pm}$0.015 V(vs. Ag/AgCl), 측정범위는 $5{\times}10^{-6}{\sim}0.2{\times}10^{-3} M(0.28{\sim}11.17 mg/L)$, 검출한계(3s)는 $1.89{\times}10^{-5}$M(1.056 mg/L)이었다.

• Biomolecules & Therapeutics
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• 제3권4호
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• pp.279-287
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• 1995

This study examined the anti-cancer effects of diallyl sulfide(DAS) and/or diallyl disulfide(DDS), major components of garlic oil, with the DEN-PH model in rats, by the numbers and areas per cm$^2$ of induced glutathion S-transferase placental form(GST-P) positive foci and silver-stained nucleolar organizer regions(Ag-NORs) counts per nuclei in liver as indicator. Sprague-Dawley(SD) rats were given the diethylnitrosamine(DEN, 200 mg/kg, i.p.) as initiator and 2 weeks later, in experiment 1, rats were treated with DAS(200 mg/kg, i.g.) and/or DDS(50 mg/kg, i.g.) for 6 weeks, respectively and concomitantly and also were given the same dose of DAS and/or DDS prior to DEN treatment for 2 weeks, and in experiment II, rats were treated with potential cancer promoter, 2-acetylaminofluorene (2-AAF, 20 mg/kg, i.g.). The DAS and/or DDS were treated prior to 2-AAF for 8 weeks, respectively and concomitantly. Then the anti-promoting effects of DAS and/or DDS were assessed. All rats were subjected to the two-thirds partial hepatectomy(PH) at week 3 and sacrificed at week 8. In experiment I, DAS and/or DDS treatment only prior to DEN showed inhibition of the development of GST-P positive foci. In experiment II, DAS and/or DDS treatment prior to 2-AAF promotion showed obvious inhibition of the development of GST-P positive foci in numbers and areas and AgNORs counts. In conclusion, We found DAS and/or DDS had the preventive effects on the hepatocarcinogenesis in rats and the concomitant treatment had some additive effects compared with the each treatment and AgNORs counts correlated well with the preneoplastic hepatic lesion.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2004년도 동계학술연구발표회 논문개요집
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• pp.200-201
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• 2004

The $H_{EB}$ was investigated for exchange coupling $20\;{\AA}\;Fe/x\;{\AA}\;NiO\;(type-I samples)$, $20\;{\AA}\;Fe/x\;{\AA}$ nonmagnetic layer $(MgO, Ag, Cu)/(500-x{\AA})$ NiO (type-II smaples). In type-I samples, the $H_{EB}$ is long-range coupling when looking from the point of view of the AFM. The $H_{EB}$ consistent with a generalized Meiklejohn-Bean approach. The critical thickness, which $H_{EB}$ is observed, is $130\;{\AA}$. In type-II samples, MgO layer more decouples the thin interfacial NiO from bottom NiO than other nonmagnetic layer. Nd the decoupling of Ag smallest. This means that the Ag layer has strong coupling the thin interfacial NiO with bottom NiO.

• 한국초전도ㆍ저온공학회논문지
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• 제3권1호
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• pp.6-10
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• 2001

Stress/stram dependencies of the critical current $I_c$ in AgMgNi sheathed multifilamentary Bi(2212) superconducting tapes were evaluated at 77K, 0T. The external reinforcement was accomplished by soldering Ag-Mg tapes to sin91e side or both sides of the sample. With the external reinforcement. the strength of tapes increased but $I_c$, decreased The $I_c$, degradation characteristic according to the external reinforcement was improved markedly in terms of the stress although it appeared less rectal.table on the basis of the strain. Effects of external reinforcement were discussed in a viewpoint of monitoring sensitivity of cracking in superconducting filaments by considering n-value representing the transport behavior of the current. It is closely associated with the location of them relative to the voltage-monitoring region in the tape.

• 한국전기전자재료학회논문지
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• 제20권9호
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• pp.802-807
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• 2007

We have developed red phosphorescent top emission organic light-emitting diodes with transparent metal cathodes deposited by using thermal evaporation technique. Phosphorescent guest molecule, BtpIr(acac), was doped in host CBP for the red phosphorescent emission, Ca/Ag, Ba/Ag, and Mg/Ag double layers were used as cathode materials of top emission devices, which were composed of glass/Ni/2TNATA(15 nm)/${\alpha}$-NPD(35 nm)/CBP:BtpIr(acac)(40 nm, 10%)/BCP(5 nm)/$Alq_3$(5 nm)/cathodes. The optical transparencies of these metal cathodes strongly depend on underlying Ca, Ba, and Mg layers. These layers also strongly affect the electrical conduction and emission properties of the red phosphorescent top emission devices.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2001년도 학술대회 논문집
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• pp.17-20
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• 2001

Stress/strain dependencies of the critical current I$_{c}$ in AgMgNi sheathed multifilamentary Bi(2212) superconducting tapes were evaluated at 77K. The external reinforcement was accomplished by soldering Ag-Mg tapes to single side or both sides of the sample. With the external reinforcement, the strength of tapes increased but I$_{c}$ decreased. The I$_{c}$ degradation characteristic according to the external reinforcement was improved markedly in terms of the stress although it appeared less remarkable on the basis of the strain. Effects of external reinforcement were discussed in a viewpoint of monitoring sensitivity of cracking in superconducting filaments by considering n-value representing the transport behavior of the current, which is closely associated with the location of them relative to the voltage-monitoring region in the tape. tape.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 학술대회 논문집
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• pp.101-104
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• 2003

Influences of transverse compressive stress on the critical current ( $I_{c}$) in AgMg and AgMn alloy sheathed Bi-2223 tapes were investigated at 77 K and 0 T. The $I_{c}$ degradation behavior depending on sample specifications was discussed in viewpoints of n-value and damage morphology. As a result, Bi-2223 tapes showed a significant drop in $I_{c}$ for stresses greater than 50MPa. The AgMg sheathed Bi-2223 tapes representing higher $I_{c}$ showed a lower $\sigma$$_{irr}$ and a significant $I_{c}$ degradation with increase in compressive stress. There existed a voltage tap separation dependency of the $I_{c}$ degradation behavior caused by the transverse compressive stress.sive stress.s.