• Journal of Microbiology and Biotechnology
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• 제28권2호
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• pp.199-209
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• 2018

Volatile organic compounds (VOCs) are increasingly been recognized as the chemical mediators of mold interactions, shaping their community dynamics, growth, and metabolism. Herein, we selectively examined the time-correlated (0 D-11 D, where D = incubation days) effects of intraspecies VOC-mediated interactions (VMI) on Aspergillus oryzae KCCM 60345 (S1), following co-cultivation with partner strain A. oryzae KACC 44967 (S2), in a specially designed twin plate assembly. The comparative evaluation of $S1_{VMI}$ (S1 subjected to VMI with S2) and its control ($S1_{Con}$) showed a notable disparity in their radial growth ($S1_{VMI}$ < $S1_{Con}$) at 5 D, protease activity ($S1_{VMI}$ > $S1_{Con}$) at 3-5 D, amylase activity ($S1_{VMI}$ < $S1_{Con}$) at 3-5 D, and antioxidant levels ($S1_{VMI}$ > $S1_{Con}$) at 3 D. Furthermore, we observed a distinct clustering pattern for gas chromatography-time of flight-mass spectrometry datasets from 5 D extracts of $S1_{VMI}$ and $S1_{Con}$ in principle component analysis (PC1: 30.85%; PC2: 10.31%) and partial least squares discriminant analysis (PLS-DA) (PLS1: 30.77; PLS2: 10.15%). Overall, 43 significantly discriminant metabolites were determined for engendering the metabolic variance based on the PLS-DA model (VIP > 0.7, p < 0.05). In general, a marked disparity in the relative abundance of amino acids ($S1_{VMI}$ > $S1_{Con}$) at 5 D, organic acids ($S1_{VMI}$ > $S1_{Con}$) at 5 D, and kojic acid ($S1_{VMI}$ < $S1_{Con}$) at 5-7 D were observed. Examining the headspace VOCs shared between S1 and S2 in the twin plate for 5 D incubated samples, we observed the relatively higher abundance of C-8 VOCs (1-octen-3-ol, (5Z)-octa-1,5-dien-3-ol, 3-octanone, 1-octen-3-ol acetate) having known semiochemical functions. The present study potentially illuminates the effects of VMI on commercially important A. oryzae's growth and biochemical phenotypes with subtle details of altered metabolomes.

• 한국미생물·생명공학회지
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• 제16권4호
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• pp.293-296
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• 1988

고온발효성인 Sacch. cerevisiae D-71과 내삼투압 성인 Zygosacch. rouxii SR-S의 원형질체를 조제하고 분리하여 그의 안정성을 검토하였다. Sacch. cerevisiae D-71의 원형질체는 0.8M KCI 과 1.0M sorbitol에서, Zygosacch. rouxii SR-S의 원형질체는 0.4M KCI과 mannitol에서 가장 안정하였고 두 효모의 원형질체들을 20Kc로 60초간 초음파 처리하였을 때 90% 이상이 파괴되었다. 또한 10000$\times$g로 10분간 처리하였을 때 Sacch. cerevisiae D-71의 원형질체는 93%, Zygosacch. rouxii SR-S의 원형질체는 84%의 안정성을 보였고 이들 원형질체들을 15W의 자외선 등으로 20cm에서 60분간 처리하였을 때 Sacch. cerevisiae의 원형질체는 99%, Zygosacch. rouxii SR-S의 원형질체는 55%가 파괴되었다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제2권2호
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• pp.125-131
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• 2002

This paper presents MMIC drive and power amplifiers covering 6-18 ㎓. For simple wideband impedance matching and less sensitivity to fabrication variation, modified distributed topologies are employed in the both amplifiers. Cascade amplifiers with a self-biasing circuit through feedback resistors are used as unit gain blocks in the drive amplifier, resulting in high gain, high stability, and compact chip size. Self impedance matching and high-pass, low-pass impedance matching networks are used in the power amplifier. In measured results, the drive amplifier showed good return losses ($S_11,{\;}S_{22}{\;}<{\;}-10.5{\;}dB$), gain flatness ($S_{21}={\;}16{\;}{\pm}0.6{\;}dB$), and $P_{1dB}{\;}>{\;}22{\;}dBm$ over 6-18 GHz. The power amplifier showed $P_{1dB}{\;}>{\;}28.8{\;}dBm$ and $P_{sat}{\;}{\approx}{\;}30.0{\;}dBm$ with good small signal characteristics ($S_{11}<-10{\;}dB,{\;}S_{22}{\;}<{\;}-6{\;}dB,{\;}and{\;}S_{21}={\;}18.5{\;}{\pm}{\;}1.25{\;}dB$) over 6-18 GHz.

• 한국작물학회지
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• 제59권3호
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• pp.293-298
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• 2014

제염중인 간척지 토양에 식용옥수수 재배 가능성을 검토코자 새만금 간척지에서 염이 제거된 토양을 대조구로 하여 토양염농도를 4수준으로 조정하여 일미찰옥수수등 4 품종을 식재하여 염농도에 따른 생장과 수량을 조사하였다. 1. 토양염농도에 따른 옥수수 입모율은 $3.2dS\;m^{-1}$까지 97% 이상 입모 되었으며, 이후 농도증가에 따라 약간씩 감소하였고. 염농도별 개화 시기는 $1.6dS\;m^{-1}$에서는 2일이 지연되었고, $3.2dS\;m^{-1}$에서는 품종에 따라 4~6일이, $4.8dS\;m^{-1}$에서는 6~10일이 지연되었다. 2. 토양염농도에 따른 식물체 생중은 찰옥4호와 얼룩찰1호가 높아서 $1.6dS\;m^{-1}$에서는 무염대비 93~97%정도였고, 염농도 $3.2dS\;m^{-1}$에서는 79% 정도의 생장량을 나타냈다. 3. 토양염농도에 따른 이삭당 종실 건물중은 Control구에 재배된 옥수수들에 비해 $1.6dS\;m^{-1}$에 재배되었을 때 평균 12.1%가 억제되었으며, $3.2dS\;m^{-1}$ 40%가 억제되었고, $4.8dS\;m^{-1}$에서는 약 70%가 억제되었다. 4. 품종간에는 찰옥 4호가 $3.2dS\;m^{-1}$에서도 이삭당 종실건물중의 감소가 상대적으로 적었다. 5. 토양염농도DP 따른 종실 무게의 감소는 $1.67dS\;m^{-1}$ - $2.18dS\;m^{-1}$에서부터 수량 감수가 시작되었고, 또한 수량의 절반이 감소되는 EC of 50%는 $2.96dS\;m^{-1}$ - $4.45dS\;m^{-1}$였다. 6. 토양염농도에 따른 각 생장요소들 간의 평균값을 비교한 결과 생장요소들이 받는 영향정도는 입모율<초장=이삭생중<식물체생중<수량 등의 순을 나타냈다.

• 천문학회지
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• 제39권3호
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• pp.57-71
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• 2006

We investigated the structural parameters of a sample of 30 dwarf galaxies(15 dEs and 15 dS0s) in the Virgo Cluster using i-band images from the Sloan Digital Sky Survey Data Release 4. Among 28 galaxies for which surface brightness profiles were derived from ellipse fittings, 23 galaxies had a single component that was adequately described by a generalized $S\acute{e}rsic$ function with a shape parameter ranging from n=0.5 to 2, while 5 galaxies(2 dEs and 3 dS0s) had bulge and disk components that were fitted by a generalized $S\acute{e}rsic$ function and an exponential function, respectively. Since the majority of dwarf galaxies in the present sample had a single component, it seems likely that genuine dS0 galaxies that have disk and bulge components are quite rare in the Virgo Cluster. The similarity in structural parameters of genuine dS0 galaxies in the Virgo Cluster with those of Magellanic-type galaxies implies that the progenitors of dwarf lenticular galaxies in the Virgo Cluster were most likely Magellanic-type galaxies if dS0s are harassed late-type spirals.

• 한국정보통신학회논문지
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• 제12권7호
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• pp.1160-1164
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• 2008

본 논문에서는 광대역 특성을 갖는 스트립라인 발룬을 설계 및 제작하였다. 제안된 스트립라인 발룬은 광대역 특성을 위하여 월킨슨 전력 분배기와 두 개의 광대역 위상 변환기로 구성된다. 광대역 발룬의 설계 주파수 대역은 $500{\sim}1500\;MHz$ 대역이고, 발룬 특성은 반사계수($S_{11}$) -10 dB 이하, 결합 손실이 -0.05 dB 이하가 되게 하기 위하여 세기차 ${\pm}0.5\;dB$ 이내, 위상차 $180{\pm}10$도 이내를 목표로 하였다. 제작된 광대역 스트립라인 발룬은 폭 12 mm, 길이 220 mm, 두께 2.3 mm로 크기를 가졌으며, 제작된 발룬 특설은 $500{\sim}1500\;MHz$ 대역에서 반사계수($S_{11}$) -10 dB 이하 위상차 약 $180{\pm}8$도 이내, 세기차 약 ${\pm}0.7\;dB$ 이내, 신호 손실 약 -2 dB를 보였다.

• 한국토양비료학회지
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• 제42권Spc호
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• pp.45-46
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• 2009

간척지 토양은 도시화와 산업화로 인해 잠식되는 농경지를 대체하는 식량공급원으로 간척지는 쌀 산업 외에 원예, 축산 등 다양한 생물산업 기반으로 활용되고 있다. 그리고 간척지 논농업(간척지 논 307만 ha)은 온실가스 저감 기능을 가지고 있으며 년간 논 1ha당 이산화탄소 흡수량 21.9t, 산소 공급량 15.9t으로 알려져 있다. 그러나 높은 염농도와 지하수위, 지하수 상승에 의한 재염화 현상, 토양 물리화학성과 배수 불량, 논의 경우 적정 유효토심은 50cm 정도이나 간척지 논 유효토심 20cm 이하로 유효토심이 매우 낮은 편이다. 또한 간척년대 경과할수록 제염은 되나 토양물리성 불량, 시비량 과다와 양분 불균형 발생으로 인하여 수분과 양분보유능 향상 토양관리 기술 개발 필요하다.

• ALGAE
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• 제26권1호
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• pp.79-86
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• 2011

Physiological studies on the hybrid by crossing between two dioecious species, Porphyra pseudolinearis and P. dentata from Korea were conducted at constant temperatures (5, 10, 15, 20, and $25^{\circ}C$), at photon flux densities (10, 20, 40, and $80\;{\mu}mol\;m^{-2}s^{-1}$) under photoperiods (14 L : 10 D and 10 L : 14 D). In the hybrid, higher growth of conchocelis was observed at 20 and $40\;{\mu}mol\;m^{-2}s^{-1}$ under 14 L : 10 D. Conchosporangial branches were produced under $10-80\;{\mu}mol\;m^{-2}s^{-1}$ at only $25^{\circ}C$, and were abundant when the conchocelis was cultured under 10 L : 14 D. Foliose thalli of the hybrid grew well at the conditions of $10-20^{\circ}C$, 10 L : 14 D and $15-20^{\circ}C$, 14 L : 10 D. The foliose thalli grew very slowly at $5^{\circ}C$ and $30^{\circ}C$, respectively. No archeospores were observed at any culture conditions. Spermatangial and zygotosporangial sori were formed at the marginal portion of mature thallus. Zygotospores from the hybrid were released at $10-2^{\circ}C$ under both photoperiods, and gave rise to form conchocelis filament. Monoecious thalli were observed at $10^{\circ}C$ under 14 L : 10 D. Neither monospores nor protothalli were produced from the conchocelis in culture.

• 대한전기학회논문지
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• 제41권1호
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• pp.50-55
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• 1992

Piezoelectric Buzzer which has been generally used requires about 30kV/cm poling process and has the aging effects. In this study, 0.85 PZN - 0.10 BT - 0.05 PT system ceramics with additives of 0 - 2 wt% YS12TOS13T were fabricated and investigated on electromechanical coupling coefficient(kS1pT), electric field induced charge coefficient(dS131T), and sound level. As the results, in the 0.4 wt% YS12TOS13T added composition ceramics compared with the basic, kS1pT was increased from 0.355 to 0.39 and induced piezoelectric d constant increased from 204 to 220 x 10S0-12T (C/N) and sound level of electrostrictive Buzzer has the highest value of 71.5 dB under 8kV/cm bias electric field.

• Journal of Chest Surgery
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• 제15권3호
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• pp.346-354
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• 1982

A Complete transposition of the great arteries combined with V.S.D, A.S.D, dextrocardia, and P.S is a rare congenital anomaly. The patient was a 10 year-old female whose complaints were frequent URI, exertional dyspnea, and cyanosis at rest since birth. Cheat X-ray films showed Dextrocardia ; situs inversus, moderate cardiomegaly, and Characteristic egg-shape heart shadow. E.K.G, Echocardiography, Cardiac Catheterization, and Angio-Cardiography were performed. Open heart Surgery was done under diagnosis of d-TGA, Dextrocardia, V.S.D, A.S.D, and P.S. At the time of Operation, Dextroeardia, T.G.A, Secndum type A.S.D, A.S.D, and P.S. At the time of Operation, Dextroeardia, T.G.A, Secndum type A.S.D. ($2.0{\times}2.0cm$. in diameter), V.S.D. type II ($1.5cm{\times}1.5cm$ in diameter), and pulmonary valvular stenosis were noted. Mustard operation using pericardial Baffle in the atrium for T.G.A. was perforsned. Teflon patch graft for closure of V.S.D. through tricuspid orifice and pulmonary Valvulotomy through pulmonary arteriotomy were performed. The post-op, low cardiac output Syndrome and dysrhythmicawere developed till Postoperative day #7, so that was controlled by inotropic and antiarrhythmic agents. After that, patient's conditions were Uneventful.