• Applied Biological Chemistry
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• 제38권3호
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• pp.248-253
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• 1995

참깨박 단백질의 기능개선을 위한 가수분해 조건을 검토한 결과 분리된 참깨박단백질에 대한 각 효소의 최적작용조건은 papain의 경우 pH 6.0, $60^{\circ}C$,효소 대 기질의 비는 기질량에 대해 3%, 기질농도 1.5%에서 최적이었으며, pepsin은 pH 2.0, $50{\sim}60^{\circ}C$, 효소의 농도는 기질량에 대해 3%, 기질농도 1%에서 최적이었다. 그리고 trypsin은 pH 9.0, $60^{\circ}C$, 효소의 농도는 기질량에 대해 1%, 기질의 농도 1%에서 가장 높은 효소작용을 보였다.

• 한국영어학회지:영어학
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• 제4권1호
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• pp.103-116
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• 2004

Chomsky (2001) and Kitahara's (2002) suggestion that object shift occurs prior to movement of the νP-subject to SPEC-T is not on the right track with respect to the Merge operation. According to the Merge operation, TP is necessarily created earlier than CP. Chomsky (2001) suggests that the probe-goal relation between T and SUBJ is evaluated in the CP after it is known whether the position of as has become a trace losing its phonological content. However, the FocP is not a phase (CP). So, Chomsky (2001) and Kitahara's (2002) suggestion is not correct in the case of the movement of OBJ to the spec of Foc in English, either. The aim of this paper is to show that the νP-subject must move to SPEC- T prior to the consecutive movement of the wh-object to SPEC-C via object shift in English. This derivation obeys Chomsky's (2001) so-called probe-goal matching condition.

• Restorative Dentistry and Endodontics
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• 제30권4호
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• pp.335-343
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• 2005

세균의 용혈활성은 세균이 숙주 내에서 생존하기 위해 필요한 철을 획득하기 위한 특성이며 기능 면에서 볼 때 숙주에 대한 중요한 독력인자로 간주될 수 있다. 본 연구에서는 괴사치수 및 치근단 치주염으로 진단된 환자의 근관에서 분리한 Prevotella nigrescens의 용혈활성을 다양한 조건 하에서 측정하여 그 특성을 규명하는 것을 목적으로 한다. 1. 임상에서 분리한 P. nigrescens와 표준균주인 P. nigrescens ATCC 33563에서 모두 용혈활성이 나타났다. 2. 사람, 면양 및 말 세 가지 종에 대해 용혈활성을 비교한 결과 사람의 적혈구에서 가장 강한 용혈활성을 나타내었다. 3. 용혈소 억제제인 $NaN_3$와 dithiothreitol(DTT)는 농도의존적으로 P. nigrescens의 용혈활성을 감소시켰다 (p<0.05) 4. P. nigrescens가 최대 용혈활성을 나타내는 최적의 pH는 4이었으며, $50^{\circ}C$이하의 온도에서는 용혈활성을 보였으나 $95^{\circ}C$에서 급격히 감소하였다. 5.배양조건에 따른 P. nigrescens의 용혈활성을 비교한 결과 $10\%\;CO_2$배양기에 배양한 경우 혐기성 조건에서 배양한 것보다 더 높은 용혈활성을 보였다.

• 환경위생공학
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• 제21권1호
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• pp.21-34
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• 2006

To investigate anti-HIV-1 activity of water soluble chitosans, sulfated chitosan derivatives were prepared in mild condition. Various sulfated chitosan derivatives (N-3,6-O-S-chitosan, N-desulfated 3,6-O-S-chitosan, 3,6-O-S-chitin, and 3,6-O-sulfated-N-(o-carboxybenzoyl) chitosan) were synthesized with sulfurtrioxidepyridene complex in pyridine solvent. Characterization of the sulfated chitosan derivatives was carried out by $^{13}C$ NMR and IR spectroscopies. To observe ionic reaction properties, pKas of the sulfated chitosan derivatives and chitosan of low molecular weight were estimated by potentiometric titration. The sulfated chitosan derivatives had high water solubility, pKas (pKa : 7.7) of N-3,6-O-S-chitosan and N-desulfated 3,6-O-S-chitosan were increased than pKa of water insoluble chitosan (pKa : 6.2), These results suggest the participation of electrostatic interaction of amino and sulfate groups on the sulfated chitosans. Anti-HIV-1 drugs, such as AZT, ddC, and ddI for anti-HIV activity had higher selective index compared with SCB-chitosan but N-3,6-O-S-chitosan has shown higher selective index compared with ddC and ddI as HIV drugs.. These results suggest that sulfated chitosan derivatives were expected as an anti-HIV drug with differential driving force mechanism against some nucleoside analogs drug in the future.

• 대한수학회논문집
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• 제38권3호
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• pp.715-723
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• 2023

In this paper, we construct explicitly an infinite family of primes P with h^±_P ≡ 0 (mod q^{deg P}), where h^±_P are the plus and minus parts of the divisor class number of the P-th cyclotomic function field over 𝔽_q(T). By using this result and Dirichlet's theorem, we give a condition of A, M ∈ 𝔽_q[T] such that there are infinitely many primes P satisfying with h^±_P ≡ 0 (mod p^e) and P ≡ A (mod M).

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제22권1호
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• pp.35-56
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• 2015

In this paper, we classify all nonconstant smooth CR maps from a sphere $S_{n,1}{\subset}\mathbb{C}^n$ with n > 3 to the Shilov boundary $S_{p,q}{\subset}\mathbb{C}^{p{\times}q}$ of a bounded symmetric domain of Cartan type I under the condition that p - q < 3n - 4. We show that they are either linear maps up to automorphisms of $S_{n,1}$ and $S_{p,q}$ or D'Angelo maps. This is the first classification of CR maps into the Shilov boundary of bounded symmetric domains other than sphere that includes nonlinear maps.

• 한국식품과학회지
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• 제29권2호
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• pp.343-347
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• 1997

Lactobacillus brevis, L. fermentum과 L. plantarum의 혼합젖산균을 사용하여 배양조건이 밀가루 용액의 발효에 미치는 영향을 살펴보았다. 온도변화에 따른 pH와 총적정산도의 변화를 살펴본 결과 pH의 감소와 총적정산도의 증가가 가장 크게 나타난 $35^{\circ}C$를 밀가루 발효의 최적온도로 선정하였다. 5L발효조에서 질소가스를 1.0 vvm으로 첨가한 혐기적 조건보다 공기를 첨가한 호기적 조건에서 총적정산도의 증가와 pH의 감소가 더 크게 나타났다. 최적 산소공급 조건을 찾기 위하여 통기량을 1.0 vvm으로 고정하고 교반속도를 달리하여 밀가루 용액의 발효한 결과 총적정산도가 가장 크게 나타난 교반속도 250 rpm에 해당되는 산소 전달속도상수 $60\;hr^{-1}$에서 최적이었다. 선정된 최적 배양조건에서 밀가루 발효액의 생산성을 높이기 위하여 반복비율을 변화시키면서 pH-stat를 이용한 반복 유가식 배양을 수행하였다. 반복비율이 증가할수록 반복 간격시간은 증가하였으나 밀가루 발효의 최대 작동시간은 감소하였다. 최적 반복비율을 결정하기 위하여 단위시간 당 배양부피 당 생산된 밀가루 발효액의 부피와 최대가동시간 동안 배양부피 당 생산된 총 밀가루 발효액의 부피를 살펴본 결과 20%의 반복비율에서 최대값을 나타내었다. 혼합젖산균을 이용한 밀가루용액의 유가식 배양에서 최적조건은 배양온도 $35^{\circ}C$, 통기량 1.0 vvm, 산소전달속도 $60\;hr^{-1}$, 반복비율 20%로 나타났다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 추계학술대회 논문집 학회본부
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• pp.193-195
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• 1988

The native oxide films were thermally and anodically formed on the n-GaP substrates grown by SSD method and measured this oxide thickness and the chemical composition and the electrical properties with formation condition. The chemical composition of themally oxidized GaP film was composed of mostly $GaPO_4$ at temperature below $800^{\circ}C$ and mostly $\beta-Ga_{2}O_{3}$ above $800^{\circ}C$. But The chemical composition of anodically oxidized GaPfilm was composed of the mixture of $Ga_{2}O_{3}$ and $P_{2}O_{5}$. The barrier height of Al/oxide/n-Gap which was formed at $700^{\circ}C$ by thermal oxidation method were 1.10eV, 1.03eV in Current-Voltage measurement. Interface charge density were $4{\times}10^{12}q(C/cm^2)$ and $3{\times}10^{12}q(C/cm^2)$ in Capacitance-Voltage measurement respectively.

• 복식
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• 제39권
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• pp.79-89
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• 1998

This study was carried out the effect of stability and color extract for it's condition in the curcuma L.. dyeing. The stability is to investigate the absorbance of the curcumin, one of the major yellow pigments and the stability regarding the effect of light, oxygen temperature and pH. The dyeing condition is compared the effect of mordanting condition and the best way to extract pigment and analysed through the color-fastness rating, color-difference value test. The main results obtained are summarized as follows ; 1.The best and proper solvent to extrect curcumin pigment was a ethanol and a distilled water. 2. The light effect indicated that the absorbances of solution in absence of ligh was more stable. 3. The oxygen(O2) effect to curcumin show-ed that the condition in the absence of O2 was more stable than that in presence of O2 4. The temperature showed that the absorbnace was best stable in4$^{\circ}C$ and less changed at $25^{\circ}C$ 5. The curcumin-etanol solution was stable in pH 2~4. 6. Generally color-fastness rating to silk, wool and cotton indicated that crocking C.F. and perspiration C.F. were more than 3rd grade and dry cleaning C.F. was more than 4th grade. But light color-fastness and washing color-fastness were very poor. 7. To make good color fastness, the mordan-ting treated group and the pre-mordant conditions were more effective than others 8. When compared with color-difference value test indicated that the silk was looks like more reddish and bluish color and than the wool and cotton were greenish and bluish. As a mordant, A(C2H4OH(COOH3) and D(K2Cr2O7)were more effective to make green-ish color in the silk and the reddish color was abtained by B(Al.K(SO4)2.12H2O) and C(FeSO4.7H2O).

• Fisheries and Aquatic Sciences
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• 제5권2호
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• pp.122-126
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• 2002

A feeding trial was conducted to determine compensatory growth of juvenile olive flounder in the spring. Five treatments of fish with 3 replicates were prepared: the control group fish (C) fed twice daily for 8 weeks, the Sl, S2, S3 and S4 fish fed for 7, 6, 5 and 4 weeks after 1, 2, 3 and 4 weeks of starvation, respectively. Survival of olive flounder was not significantly different among treatments. Weight gain of flounder in S2 was significantly (P<0.05) higher than that of fish in S3 or S4, but not significantly different from that of fish in C or Sl. The poorest weight gain was observed in fish of S4 treatment. Specific growth rate (SGR) for flounder in S2 was significantly (P<0.05) higher than that for fish in C or S4, but not significantly different from that of fish in Sl or S3. Feed intake (g/fish) was proportional to duration of days of feeding except for flounder in S2, but not significantly different among C, Sl or S2. Feed efficiency ratio (FER) and protein efficiency ratio (PER) for flounder in S2 were significantly (P<0.05) higher than for fish in C, but not significantly different from those for fish in Sl, S3 or S4. Hepatosomatic index (HSI) and condition factor (CF) for flounder in Sl, S3 and S4 were not significantly different from those for fish in C, but significantly (P<0.05) lower than S2 except for CF in Sl at the end of the experiment. Proximate composition of the whole body of flounder was not significantly different among treatments. In considering results of the experiment, juvenile olive flounder achieved compensatory growth when properly fed after starved up to 2 weeks in the spring. Compensatory growth of fish was supported by improvement in SGR, FER and PER in fish starved.