• 한국미생물·생명공학회지
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• 제16권2호
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• pp.136-141
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• 1988

고온 발효성인 Saccharomyces cerevisiae D-71과 내삼투압성인 Zygosaccharomyces rouxii SR-S를 여러 조건에서 배양하여 Zymolyase-20T에 대한 감수성을 조사하였다. Sacch. cerevisiae D-71의 glucan과 mannan 함량은 각각 l4.5%와 14.8% 이었고 Zygosacch. rouxii SR-S는 24.0%와 19.0% 이었다. 0.5% methionine 과 0,1% glucose를 함유한 wickerham 합성배지에 Sacch. cerevisiae D-71를 배양하여 얻은 세포의 Zymolyase-20T에 대한 감수성은 66% 이었고 $K_2$HPO$_4$와 aminobenzoic acid를 결핍시켰을 때 감수성이 가장 낮았다. 또한 0.5% peptone과 o.15% methionine 및 0.1% glucose를 함유한 wickerham 합성배지에 Zygosacch. rouxii SR-S를 배양하여 얻은 세포의 감수성은 80% 이었고 KI와 pyridoxine을 결핍시켰을 때 감수성이 가장 낮았다. $25^{\circ}C$에서 YMPG 배지에 Sacch. cerevisiae D-71를 접종하여 12시간 정치배양한 세포의 Zymolyase-20T에 대한 감수성은 76% 이었고 Zygosacch. reuxii SR-S를 같은 조건으로 30시간 배양한 세포의 감수성은 82%로서 wickerham 합성배지에서의 감수성보다 더 좋았다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 춘계학술논문 발표대회
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• pp.63-66
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• 2007

This study investigates the fire resistance properties of high strength concrete, around 60MPa class, designed with various admixture types and fiber content. Test showed that the increase of fiber content decreased the fluidity and slightly inclined the air content of fresh concrete. However, the fiber content in concrete did not affect the compressive strength. For the addition of admixture, specimens adding the shrinkage-reducing-agent (SR) indicated the strength value at 70MPa, which is followed by incorporating silica fume (SF) at 66MPa, the combination of expansive admixture (EA) and SR at 63MPa, only EA at 59MPa, blast furnace slag (BS) at 58MPa and fly ash (FA) at 50MPa in an order. After completing the fire test, all specimens adding 0.05vol.% of polypropylene fiber exhibited protection of spatting, except for the specimens incorporating loft of SF and incorporating 20% of SF with only SR and the combination of EP and SRA, respectively. Therefore the most effective result of this study was shown in the specimens incorporating love of FA and 30% of BS and incorporating 20% of SF with 5 % of EA. It is expected that this test results will be crucial references in near future to develope the spatting resistance method of high strength concrete.

• 공업화학
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• 제7권1호
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• pp.9-17
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• 1996

고체전해질형 연료전지용 전해질로 사용되는 8mol% YSZ($Y_2O_3$ stabilized zirconia)의 소결조건을 변화시켜 이온전도도를 측정하였다. 그 결과 소결조건이 $1400^{\circ}C$, 10시간이었을 때 가장 높은 값인 $10^{-1}S.cm^{-1}$를 나타내었다. 또한 산소극재료로서 $La_{1-x}Sr_xMnO_3$($0{\leq}{\times}{\leq}1$)를 고상반응법으로 제조하여 과전압, 전자 전도도, 전해질인 YSZ와의 계면저항등을 살펴보았다. 그 결과 La에 대한 Sr의 치환량이 50mol%일 때 가장 우수한 특성을 나타내었다.

• Progress in Superconductivity
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• 제10권2호
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• pp.128-132
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• 2009

Polycrystalline samples of $(Ru_{0.8}Nb_{0.2})Sr_2(Gd_{1.5-x}Nd_xCe_{0.5})Cu_2O_z$($ 0{\leq}x{\leq}1.25$) have been synthesized by a solid-state reaction route. The X-ray diffraction data revealed that the Nd solubility limit can be placed between x=0.5 and x=0.75. The superconducting transition temperature decreased with increasing Nd content, confirming that Nd entered the lattice. Room-temperature thermoelectric power measurements showed that all the samples are in the underdoped state and the partial substitution of Nd for Gd resulted in a decrease in the carrier density on the superconducting layers.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.561-564
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• 2008

$Ba_{1-x}M_xGa_2S_4:Eu^{2+}$ (M = Ca, Sr) phosphor was prepared for white light emitting diodes application. Photoluminescence (PL) emission and excitation bands were red-shifted with increase of Ca and Sr content due to the crystal field effect. Moreover, the PL intensity under 450 nm was increased by substitution of Ca and Sr.

• 한국주조공학회지
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• 제13권1호
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• pp.94-101
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• 1993

The effects of strontium content as modifier on microstructure and mechanical properties were studied in Al-10%Si-0.3%Mg cast alloys. There were not big differences in the form of eutectic Si particle and its morphology depending on adding amount of strontium, but the alloy modified by 0.012%Sr had shown the higher values than the alloy modified 0.038%Sr in strength, elongation and impact value.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 C
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• pp.1466-1468
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• 1994

In this paper Dielectric and strain properties of (1-x-y)PMN-yPT-xST Ceramics have been investigated as a function of the amount of $SrTiO_3(ST)$. The $SrTiO_3$ content is ranged from 0.01-0.06(wt%). As the amount of ST is increased, dielectric constant has a maximum value at 0.05 mol composition. The Curie temperature is decreased linearly with increasing ST composition and Polarization properties have been investigated. Coercive field and ramnant polarization has a maximum value at 0.01mol composition.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1994년도 춘계학술대회 논문집
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• pp.5-8
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• 1994

In this paper, Dielectric and strain properties of (1-x-y)PMN-yPT-xST Ceramics hale been investigated as a function of the amount of SrTiO$_3$(ST). The SrTiO$_3$ content is ranged from 0.01-0.05(wt%). As the amount of ST is increased, dielectric constant has a maximun value at 0.05 mol% composition. The Curie temperature is decreased linearly with increasing ST composition and Polarization properties have been investigated. Coercive field and remnant polarization has a maximum value at 0.01mo1% composiion.

• Journal of Radiation Protection and Research
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• 제27권2호
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• pp.101-110
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• 2002

한국 주변 연안 15개 정점의 퇴적물(0-20 cm)에서 $^{137}Cs,\;^{90}Sr\;^{239-240}Pu$의 농도와 농도 비를 조사했다. $^{137}Cs,\;^{90}Sr\;^{238}Pu$ 및 $^{239-240}Pu$의 평균 방사능 농도는 각각 $2.24{\pm0.79\;Bq{\cdot}kg^{-1}-dry,\;0.20{\pm}0.04 Bq{\cdot}kg^{-1}-dry,\;0.009{\pm}0.005\;Bq{\cdot}kg^{-1}-dry}$ 및 $0.27{\pm}0.17\;Bq{\cdot}kg^{-1}-dry$ 이다. $^{137}Cs,\;^{90}Sr$, $^{239-240}Pu/^{137}Cs$ 및 $^{238}Pu/^{239-240}Pu$의 평균 농도 비와 $^{239}Pu/^{240}Pu$의 평균 원자 비는 각각 $11.2{\pm}2.9,\;0.123{\pm}0.053,\;0.033{\pm}0.016$ 및 $0.218{\pm}0.036$이다. 퇴적물에서 핵종의 농도 범위와 핵종간의 농도 비는 그 동안 주변국가의 퇴적물에서 조사한 값과 비슷하였다. 퇴적물에서 $^{137}Cs$ 과 $^{239-240}Pu$의 상관계수는 0.80 이다. $^{137}Cs$과 SOM, $^{239-240}Pu$과 점토 함량과의 상관계수는 각각 0.69, 0.67 이다.

• 약학회지
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• 제58권4호
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• pp.245-249
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• 2014

Murrayafoline-A (1-methoxy-3-methylcarbazole) is a monomeric carbazole alkaloid found in Murraya euchrestifolia HAYATA and Glycosmis stenocarpa. We have recently shown that murrayafoline-A has positive inotropic effect in isolated rat ventricular myocytes. To know possible mechanisms for the positive inotropic effect of murrayafoline-A we examined the effects of murrayafoline-A on in situ behavior of cardiac $Ca^{2+}$ release units ('$Ca^{2+}$ sparks') and sarcoplasmic reticulum (SR) $Ca^{2+}$ loading using confocal $Ca^{2+}$ imaging method in single rat ventricular myocytes. Murrayafoline-A significantly increased the frequency (events/($10^3{\mu}m^2{\cdot}s$)) of $Ca^{2+}$ sparks in a concentration-dependent manner, with an $EC_{50}$ of $28{\pm}6.4{\mu}M$ and a maximal ~twofold change. The $Ca^{2+}$ content in the SR, measured as caffeine (10 mM)-induced $Ca^{2+}$ transient, was significantly increased by murrayafoline-A (${\approx}$116% and ${\approx}$123% of control at 25 and 100 ${\mu}M$, respectively). In addition, murrayafoline-A significantly increased the fractional $Ca^{2+}$ release, suggesting increase in the efficacy of $Ca^{2+}$ release at given SR $Ca^{2+}$ loading. These results suggest that murrayafoline-A may enhance contractility via increase in $Ca^{2+}$ release from the SR through the ryanodine receptors in ventricular myocytes.