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SO2 가스가 황화반응된 CuO/γ-AI2O3 흡수제의 재생반응에 미치는 영향
유경선,김상돈,정상문 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
열중량 분석기를 이용하여 황화반응된 CuO/γ-Al₂O₃흡수제의 수소 재생반응에서 SO₂ 가스가 미치는 영향을 연구하였다. 황화반응된 CuO/γ-Al₂O₃흡수제의 재생반응 속도는 SO₂존재에 의하여 감소되었으며 pseudoequilibrium 상태의 평형 전환율이 나타났다. 평형전환율은 SO₂ 농도 15 vol% 까지 농도 증가에 따라 감소하였으며 그 이상의 농도에서는 일정한 값을 유지하였다. SO 가스의 주입을 중지하면 수소에 의한 재생반응이 다시 진행되었으며 SO₂의 농도와 재생반응 온도에 관계없이 일정한 0.9μ㏖ SO₂/㎡의 탈착량을 보였다. The effect of SO₂ gas on regeneration of the sulfated CuO/γ-Al₂O₃ sorbent by hydrogen gas has been determined in a thermogravimetric analyzer(TGA). The presence of SO₂ gas reduces the regeneration rate of the sulfated CuO/γ-Al₂O₃ sorbent and regeneration conversion of pseudoequilibrium state is observed. Equilibrium conversion decreases with increasing SO₂ concentration up to 15 vol% and then remains constant. Without SO₂ gas injection, the regeneration reaction by hydrogen gas resumes and the amount of desorbed SO₂ exhibits a constant value of 0.9μ㏖ SO₂/㎡ regardless of SO₂concentration and regeneration temperature employed.
근접장 마이크로파 현미경을 이용한 로돕신의 광학적 특성 연구
유경선,김송희,윤영운,이기진,이정하,최아름,정광환,Yu, Kyung-Son,Kim, Song-Hui,Yoon, Young-Woon,Lee, Kie-Jin,Lee, Jung-Ha,Choi, Ah-Reum,Jung, Kwang-Hwan 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.1
We report the electro-optical properties of the sensory rhodopsin II using a near-field scanning microwave microscope(NSMM). Rhodopsin was known as a photoreceptor pigment with a retinal as a chromophore via a protonated Schiff base and consists of seven ${\alpha}-helical$ transmembrane segments. The sensory rhodopsin II, expressing E. coli UT5600 with endogenous retinal biosynthesis system and purified with $Ni^{-2}-NTA$ affinity chromatography in the presence of 0.02 % DM (Dodecyl Maltoside) from Natronomonas pharaonis. We measured the absorption spectra and the transients difference of sensory rhodopsin II from Natronomonas pharaonis using a UV/VIS spectrophotometer with Nd-Yag Laser (532 nm). The absorption spectra of NpSR II showed a typical rhodopsin spectrum with a left shoulder region and the photointermediates spectra of NpSR II-ground state (${\lambda}max=498\;nm$), NpSR II-M state (${\lambda}max=390\;nm$), and NpSR II-O state (${\lambda}max=550\;nm$) during the photocycle. The observed photocycle reaction was confirmed by measuring the microwave reflection coefficient $S_{11}$ at an operating frequency of f=3.93-3.95 GHz and compared with the results of a photocycle of NpSR II.