조류와 유기화합물의 동시제거를 위한 흡착 - DAF 복합공정

이재욱,곽동희,최승필,정흥조 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2

Dissolved air flotation (DAF) is an effective solid/liquid separation process for low density floc particles such as algal, color-alum and clay-alum flocs produced from low turbidity water. The removal of taste and odorcausing organics (2-mthylisoboneol and geosmin) originating from algae in drinking water is a local and worldwide concern. Although DAF has been effectively applied for the removal of suspended solid, its application for the treatment of dissolved organic carbon is very limited. In this study, a new hybrid system consisting of adsorption and DAF processes was introduced for the simultaneous removal of algae and taste and odorcausing organics. Powdered activated carbon (PAC) was used as an adsorbent. In this proposed system, the major concern of eliminating the spent PAC from the system was also addressed. It was found that zeta potential of algae and PAC was increased with coagulant dosage, and the removal efficiency in DAF was also enhanced up to 90-95% under the given experimental conditions. Based on this study, the hybrid process was found to be a promising technology for the simultaneous removal of algae and dissolved organic pollutants.

殺蟲性 O,O-Diethylphenylphosphate 誘導體의 形態와 反應性에 關한 分子軌道論的 硏究

朴勝熙,成洛道,明平根,全容求,李天培 충남대학교 약학대학 의약품개발연구소 1985 藥學論文集 Vol.1 No.-

Molecular orbital theoretical study on the stability of conformations and chemical reactivity of 0,0-diethyphenylphosphate derivatives were carried out by EHT and CNDO/2 molecular orbital calculation method. The results shown that the dipole moment(μ) and total energies of the θ=90° conformer were μ=3.185D & E_t=-162.6479(au) and also that of the θ=0° conformer were μ=5.596D & E_t=-162.4013(au), respectively. Therefore, the values of μ & E_t of the θ=90° conformer were much smaller than that of the θ=0° conformer. The form with angle of rotation θ=90° of phenyl ring was shown to be most stable and this was interpreted in terms of electrostatic and steric effect. O,O-diethylphenylphosphate derivatives are predicted to increase both charge and orbital controlled SN_2 reactivity of the electron withdrawing substituent reduces the HOMO & LUMO energy, while the electron withdrawing substituent due to increase in positive charge of phosphorus atom of phosphate molecule.

결절성경화증 환자에서의 SPECT 뇌영상 : 예비적 연구 A preliminary report

한설희,이상수,정승연 충북대학교 의과대학 충북대학교 의학연구소 1991 忠北醫大學術誌 Vol.1 No.1

간질발작을 포함한 전형적인 삼징후가 동반된 결절성경화증 환자를 대상으로 뇌파검사, 뇌전산화단층촬영술 및 단일광자방출단층촬영술을 시행하였다. 뇌전산화단층촬영술에서는 상의하석회화병소와 조영제증강이 뚜렷하지 않은 피질에 연한 저음영 소견이 관찰되었으며 이어서 시행한 단일광자방출단층촬영술에서는 뇌전산화단층촬영술 소견보다 더 광범위한 부위에 관류결손이 관찰되었다. 단일광자방출단층촬영술은 결절성경화증 환자에서 간질발현 병소인 피질결절을 발견하는데 있어서 전산화단층촬영술 및 뇌파검사보다 더 유용한 방법이며 치료방침 결정이나 예후판정에 있어서도 큰 도움을 줄 것으로 기대된다. Two patients with a well-established diagnosis of tuberous sclerosis and epilepsies as their principal clinical symptom were examined by conventional surface electroencephalography(EEG), computed tomography, and single photon emission computed tomography(SPECT) using the 99mTc hexamethyl prophyleneamine oxime(99mTc-HMPAO). The interictal EEG showed various abnormalities of poor localizing value. Brain computed tomography surely demonstrated subependymal calcifications, although the cortical lesions were not so conspicuous. However, the SPECT images of each patient clearly demonstrated decreased cerebral perfusion in cortical areas. It may be assumed that such perfusion defect areas represent the epileptic cortical tubers or those of altered myelination, which are characteristics of the disease.

Arabidopsis thaliana의 Ethylene Triple Response Mutant에서 에틸렌 생합성 과정의 생리 생화학적 특성

姜熙燕,金佑澤,李埈承 이화여자대학교 생명과학연구소 1996 생명과학연구논문집 Vol.7 No.-

Arabidopsis thaliana의 에틸렌 관련 돌연변이체인 에틸렌 과다 생성 돌연변이체(eto1-1)와 에틸렌에 대한 반응이 둔감한 돌연변이체(etr1-3과 ein2-1)의 생리·생화학적 특성을 분석하였다. 2∼3주된 Arabidopsis 식물로부터 얻은 성숙한 잎을 재료로 이용하였다. 에틸렌 생성량은 eto1-1은 야생형의 2배, etr1-3은 야생형의 4배, 그리고 ein2-1은 야생형의 4.5배 더 많았다. eto1-1에서의 ACC synthase와 ACC oxidase 활성은 야생형과 비슷하였으나 ACC 함량은 야생형보다 4.5배 더 많았다. ACC N-malo-nyltransferase의 활성은 eto1-1이 야생형보다 3배 더 높았으며 SAM synthetase의 활성은 야생형보다 1.5배 더 높았다. 이들 결과로부터 eto1-1로의 변형은 SAM에서 ACC로 전환되는 과정 이전에 있음을 추측할 수 있다. etr1-3과 ein2-1에서 ACC synthase의 활성은 야생형보다 높았으나 ACC oxidase의 활성은 야생형보다 낮았다. 그러나 SAM synthetase 활성은 etr1-3에서는 야생형과 비슷하였고 ein2-1에서는 야생형보다 1.7배 높았다. 이것은 etr1-3과 ein2-1이 에틸렌에 대한 반응에 결함이 있기 때문에 그것으로 인하여 자가 조절이 되지 않았기 때문으로 추정된다. etr1-3의 ACC 함량은 야생형보다 2.3배 더 많았으며 ACC N-malonyltransferase의 활성은 야생형보다 3.9배 더 높았다. 그리고 ein2-1의 ACC 함량은 야생형보다 1.7배 더 많았으며 ACC N-malonyltransferase의 활성도 야생형보다 2배 더 높았다. 따라서 기질의 증가로 인하여 ACC N-malonyltransferase의 활성이 촉진된 것으로 추정된다. In vitro kinase assay를 한 결과 eto1-1과 ein2-1에서 36kDa 단백질의 인산화를 관찰할 수 있었다. The physiological and biochemical characterizations of the ethylene-related mutants in Arabidopsis thaliana-ethylene overproducing mutant(eto1-1)and ethylene insensitive mutants(etr1-3, ein2-1)-were detailed in this studies. Two or three week-old mature rosette leaves(before bolting)were used as the plant materials. Ethylene productions pf eto1-1, etr1-3, and ein2-1 mutants were about 200%, 400%, and 450% compared to that of wild type, respectively. ACC synthase and ACC oxidase activities of eto1-1 mutant were similar to those of wild type. ACC content and ACC N-malonyltransferase activity, however, were 4.5 times and 3 times higher than those of wild type, respectively. SAM synthetase activity increased by 50% in eto1-1 mutant plant. These results indicated that the alteration in the eto1-1 mutant occured before the step of the conversion of SAM to ACC. In etr1-3 and ein2-1 mutants, ACC synthase activities increased, but ACC oxidase activities decreased. ACC content and ACC N-malonyltransferase activity were 2 times higher than those of wild type. SAM synthetase activity in etr1-3 is similar to those of wild type, while it increased by 73% in ein2-1. These results showed that block in ethylene action affected the autoregulation of ethylene biosynthesis, so that ACC synthase activity was not autoinhibited and ACC oxidase activity was not autostimulated by ethylence. When the leaf tissus were used for in vitro kinase assay, a cytosolic protein(approximately 36 kDa)was phosphorylated only in eto1-1 and ein2-1 mutants.

창원시 농촌지역 간이상수도 오염실태 조사

김승현,이덕희 경남대학교 환경문제연구소 1997 환경연구 Vol.19 No.-

Contamination of small water systems at rural areas of Changwon city was investigated in this study. The results of this study showed that the KDWQS compliance rate by small water systems in the study area was better than national average, but worse than the US average. Microbial standards were more frequently violated than any other standard. However, small water systems in the ,study area were found to be relatively less contaminated than groundwaters in other areas of Korea. No heavy metal was detected in small water systems in the study area. 4 % and 1 % of small water systems in the study area violated the NO₃-N and F^(-) standards. NO₃-N was found to be closely related to the planting area. No organic standard was violated and no pesticide/herbicide was detected. A few VOC (TCE, bensene, toluene, ethylbenzene) were detected, but their concentrations were low.

광합성세균 Rhodospirillum rubrum의 생장과 Bacteriochlorophyll 및 Carotenoids의 형성에 대한 탄소원의 영향

송승희,이수오,오덕철 濟州大學校 基礎科學硏究所 1994 基礎科學硏究 Vol.7 No.1

광합성 세균인 Rhodospirillum rubrum으로 생장과 색소 형성에 대한 탄소원의 영향을 조사하였다. 탄소원은 acetate, alanine, glutamate 그리고 malate였으며 단독 또는 혼합하여 사용하였다. 세포 생장은 glutamate배지에서 가장 느렸으며 glutamate-malate 혼합배지에서 가장 빨랐다. acetate와 glutamate를 혼합 하였을 때는 두 가지를 단독으로 사용했을 때보다 월등히 빠른 생장을 나타내었다. 대부분의 경우 탄소원을 단독으로 사용했을 때보다 혼합하였을 때 빠른 생장을 나타내었다. 대부분의 경우 탄소원을 단독으로 사용했을 때보다 혼합하였을 때 빠른 생장을 나타내는 것으로 보인다. 색소가 없는 R.rubrum은 혐기적으로 광을 조사하였을 때 bacteriochlorophyll과 carotenoid를 탄소원의 종류에 관계없이 동시에 형성하였으며 bacteriochlorophyll 비함량은 alanine 배지와 glutamate-alanine 혼합배지에서 가장 높고, carotenoid 비함량은 malate 배지와 malate-alanine 혼합배지에서 가장 높아서 두 색소의 비함량에 대한 탄소원의 영향은 다르게 나타났다. 탄소원에 따른 생장량과 색소 함량은 반드시 일치하지 않았고 색소 형성이나 생장에 있어서의 효과는 탄소원의 종류에 따라 달랐다. 세포내 bacteriochlorophyll에 대한 carotenoid의 비함량비는 다소 변화가 있으나 대개 1: 1 수준이었다. The influences of organic compounds such as acetate, alanine, glutamate and malate, on the growth and formation of photosynthetic pigments as a sole or mixed carbon sources were tested in a photosynthetic bacterium, Rhodospirillum rubrum. Cells grew most rapidly in culture on glutamate-malate mixtrues and showed slowest growth in glutamate among all cultures.Cells cultured on acetate-glutamate mixtures showed much rapid growth than those on single carbon source separately. Cells cultured on mixed carbon sources generally grew more rapidly than those on each single carbon source, so it seems that mixtures of carbon sources exhibit synergistic effect on cell growth. The for mation of bacteriochlorophyll and carotenoids was initiated simultaneously regardless of the kind of carbon source. The synergistic effect of mixed carbon sources on the formation of photosynthetic pigments of R. rubrum was not shown distinctly. The influence of carbon sources on the growth and formation of photosynthetic pigments were not coincided. The ratios of specific contents of carotenoids to bacteriochlorophyll were about 1 : 2 with some variations according to carbon sources.

알칼리 처리된 제지슬러지의 메탄발효에 미치는 몇몇 첨가제의 효과

최종우,이규승,박승희 충남대학교 농업과학연구소 1995 농업과학연구 Vol.22 No.2

In order to elevate the efficiency of methane fermentation using the paper mill sludge, this experiment was conducted at two temperature conditions(35℃ and 60℃), and overlooked the addition effects of ethyl acetate as a substrate, nickel as a constituent of F_430, and sulfur as a cell growth factor and reductant. The cellulose of paper mill sludge was degraded to lower molecular materials by heating at 60℃ and NaOH treatment. Methane forming rates were 4.8% from NaOH-treated paper mill sludge added with ethyl acetate, 16.5% with sodium sulfide, 19.8% with nickel trioxide, 31.9% with mixture, and 9.6% with control at 60℃, but 0.21% with ethyl acetate, 2.14% with nickel acetate, 3.02% with nickel sulfate, 3.34% with nickel trioxide and 0.62% with control at 35℃. Therefore, methane yield was increased by approximately 10-fold at 60℃ than 35℃, and fermentation liquid added with mixture(nickel trioxide+ethyl acetate+sodium sulfide) at 60℃ showed the medium pH(7.0), higher COD value and lower nitrogen content.

上水處理에서 HCO₃濃度가 凝集效果에 미치는 影響에 關하여

朴永圭,李哲熙,曺秉樂,朴勝吉 嶺南大學校 環境問題硏究所 1982 環境硏究 Vol.2 No.1

In this paper is presented the effect of ?? concentration on the efficiency of the turbidity removal by flocculation with alum or ferric sulfate. It is confirmed that pH range of the optimal flocculation conditions for the raw water contained the initial ?? concentration of 80mg/1 is expanded to 5-8 or 4-6, res-pectively, by treating with alum and ferric sulfate as a coagulants. The residual turbidity treated water is also decreased to 2NTU with alum and to 4NUT for the case of ferric sulfate. The determined agglomeration rate constant, K₁, and erosion rate constant, K₂, for floc are as follows; coagulants agglomeration rate constant erosion rate constant (initial ?? conc.) K₁ K₂ alum(80mg/1) 0.29 0.3 ferric sulfate(40mg/1) 0.35 0.26 Here is discussed the number of the reactor for the continuous flow needed to treating below 5NTU and also discussed treated watar quality which is predicted from kinetic model by using agglomeration rate constant, K₁, and erosion rate constant, k₂.

Comet Assay 를 이용한 제주 자생 녹조류 추출물의 세포내 DNA 손상 억제 활성 효과

안긴내,이승홍,차선희,고석천,전유진 제주대학교 방사능이용연구소 2006 방사선응용과학연구소논문집 Vol.20 No.-

선박용 유배출 감시 장치(ODME)를 위한 유분 농도계 설계

손교훈,이승희,김재형 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-

본 논문에서는 태형 탱커선의 의무 장비인 유배출 감시 장비 (Oil Discharge Monitoring Equipment)를 위한 유분 농도계의 설계에 대하여 연구하였다. ODME는 국제해사기구(IMO)에서 규정된 ton 이상의 대형 선박에 의무적으로 설치하도록 규정하고 있으며 이는 날로 심각해지는 해양 오염을 방지하는데 목적이 있다. ODME의 구성요소 중 가장 중요한 것은 유분 농도계이며 이는 선박에서 배출되는 물에 포함된 유 성분을 ppm 단위로 계측하는 것이다. 본 연구에서는 선박에서 사용이 용이한 산란방식의 유분 농도계의 설게에 대한 농도 계산 알고리즘에 대하여 고찰하였으며 0~100ppm 범위에서 ±5%의 오차 이내로 측정이 가능함을 보였다. 이는 IMO의 규격에 만족하는 수치이다.