• 대한화학회지
• /
• 제42권4호
• /
• pp.383-390
• /
• 1998

몇 가지 양이온 계면활성제(DTAB, TTAB, CTAB, CDEAB 및 CTAC)의 마이셀과 Phenoxide 음이온과의 상호작용을 연구하기 위하여 UV/Vis분광광도법을 이용하였다. Phenoxide 음이온의 용액에 양이온 게면활성제를 녹였을 때 일어나는 흡광도의 변화로부터 Phenoxide 음이온의 가용화상수($K_s$)와 양이온 계면활성제의 임계마이셀농도(CMC)값을 함께 측정하였다. 각 양이온 계면활성제의 수용액에서 Phenoxide 음이온의 가용화상수값($K_s$)은 다음의 순서로 변하였다: $K_s(CTAC)>K_s(CDEAB)>K_s(CTAB)>K_s(TTAB)>K_s(DTAB).$ 또한 Phenoxide 음이온의 가용화에 미치는 염(NaCl 및 NaBr)과 n-알코올(부탄올, 펜탄올 및 헥산올)의 효과에 대하여 조사하였으며, 그 결과 염과 n-알코올의 첨가로 Ks와 CMC값은 크게 감소하는 경향을 보였다. 그리고 온도에 다른 Ks값의 변화로부터 Phenoxide 음이온의 가용화에 대한 표준자유에너지, 엔탈피, 및 엔트로피의 변화를 계산하고 분석하였다.

• 대한수학회보
• /
• 제54권3호
• /
• pp.731-736
• /
• 2017

It is well-known that there exists a constant-weight $[s{\theta}_{k-1},k,sq^{k-1}]_q$ code for any positive integer s, which is an s-fold simplex code, where ${\theta}_j=(q^{j+1}-1)/(q-1)$. This gives an upper bound $n_q(k,sq^{k-1}+d){\leq}s{\theta}_{k-1}+n_q(k,d)$ for any positive integer d, where $n_q(k,d)$ is the minimum length n for which an $[n,k,d]_q$ code exists. We construct a two-weight $[s{\theta}_{k-1}+1,k,sq^{k-1}]_q$ code for $1{\leq}s{\leq}k-3$, which gives a better upper bound $n_q(k,sq^{k-1}+d){\leq}s{\theta}_{k-1}+1+n_q(k-1,d)$ for $1{\leq}d{\leq}q^s$. As another application, we prove that $n_q(5,d)={\sum_{i=0}^{4}}{\lceil}d/q^i{\rceil}$ for $q^4+1{\leq}d{\leq}q^4+q$ for any prime power q.

• 한국초전도학회:학술대회논문집
• /
• 한국초전도학회 2002년도 High Temperature Superconductivity Vol.XII
• /
• pp.79-79
• /
• 2002

• Journal of Microbiology and Biotechnology
• /
• 제15권5호
• /
• pp.1100-1105
• /
• 2005

Previous work has identified a Streptomyces coelicolor gene, rns, encoding a 140 kDa protein (RNase ES) that exhibits the endoribonucleolytic cleavage specificity characteristic of RNase E and confers viability on and allows the propagation of E. coli cells lacking RNase E. Here, we identify a putative S. coelicolor 9S rRNA sequence and sites cleaved by RNase ES. The cleavage of the S. coelicolor 9S rRNA transcript by RNase ES resulted in a 5S rRNA precursor (p5S) that had four and two additional nucleotides at the 5' end and 3' ends of the mature 5S rRNA, respectively. However, despite the similarities between RNase E and RNase ES, these enzymes could accurately process 9S rRNA from just their own bacteria, indicating that these ancient enzymes and the rRNA segments that they attack appear to have co-evolved.

• Journal of Yeungnam Medical Science
• /
• 제31권1호
• /
• pp.52-55
• /
• 2014

Protein S deficiency is one of the several risk factors for thrombophilia and can cause blood clotting disorders such as deep vein thrombosis and pulmonary embolism. A 54-year-old man was admitted with the complaint of dyspnea and was diagnosed with pulmonary embolism. The patient had very low level of free protein S, total protein S antigen, and protein S activity (type I protein S deficiency). In history taking, we found that his mother, 78 year old, had a history of same disease 10 years ago, and confirmed the pronounced low level of protein S. The patient's son also had very low level of protein S, however there had not been any history of pulmonary embolism yet. This case study suggests that asymptomatic persons with a family history of protein S deficiency and pulmonary embolism should be checked regularly for early detection of the disease, as protein S deficiency can be suspected.

• 한국초전도학회:학술대회논문집
• /
• 한국초전도학회 2006년도 High Temperature Superconductivity Vol.XVI
• /
• pp.6-6
• /
• 2006

• 대한생식의학회:학술대회논문집
• /
• 대한생식의학회 2007년도 제52차 춘계학술대회 초록집
• /
• pp.144-144
• /
• 2007

• 복식문화학회:학술대회논문집
• /
• 복식문화학회 2005년도 Joint International Conference
• /
• pp.145-147
• /
• 2005

• 한국초전도학회:학술대회논문집
• /
• 한국초전도학회 2005년도 High Temperature Superconductivity Vol.XV
• /
• pp.81-81
• /
• 2005

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1996년도 하계학술대회 논문집 C
• /
• pp.1876-1878
• /
• 1996

This paper describes the combination surge generator for applying performance tests of surge protective devices. The $8/20{\mu}s$ waveform applies to low impedance circuits and components and is commonly used to determine the characteristics of surge protective devices. And the $1.2/50{\mu}s$ waveform applies to high impedance circuits and components and is used for testing dielectric behavior. Therefore, the combination surge generator, which generates $1.2/50{\mu}s$ voltage waveform under open-circuit conditions and $8/20{\mu}s$ current waveform under short-circuit condition, was proposed. Also this generator can produce $10/1000{\mu}s$ as well as $0.5{\mu}s/100kHz$ ring waveform.