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혼합용매법에 의한 Mullite 전미분체 생성기구에 관한 연구
황운연,이정운,박형상,김용렬,구기갑 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4
Si-와 Al-알콕시드의 반응속도 차이를 조절하기 위한 부분 가수분해법과 입자 형태를 제조하기 위한 혼합용매법을 이용하여 구형의 미세한 mullite 전미분체를 제조하였다. Mie 이론을 적용시켜 반응시간에 따른 반응용액의 탁도 및 입자 수밀도의 변화를 측정하여 혼합용매법에 의한 입자 생성기구에 대하여 고찰하였다. 알콕시드와 옥탄올 용액에 아세토니트릴을 첨가하면 알콕시드의 용해도가 낮아지고 따라서 알콕시드의 일부가 액적을 형성하며, 액적은 안정화제 (HPC)에 의하여 구형을 유지하게 된다. 그리고 가수분해 및 축합중합 반응에 의하여 액적의 입자 크기는 감소하며, 동시에 혼합용액에 용해되어 있던 알콕시의 가수 분해 및 축합중합 반응에 의하여 미세 입자가 생성된다. 액적형태로 생성된 큰 입자와 미세 입자의 응집에 의하여 최종 입자가 생성되었다. In this study, spherical fine pre-mullite particles were prepared by partial hydrolysis method to control the reaction rate difference of two alkoxides, and by mixed solvent method to control the particle shape. Based on the adaptation of Mie theory, the formation mechanism of pre-mullite particle in alkoxide-octanol-acetonitile system has been investigated by measuring of the turbidity of solution, the number density and the size of the particles during the reaction. As the acetonitrile was added in the alkoxide-octanol solution, the solubility of the alkoxide decreased. A part of alkoxide was segregated from solution in the form of droplets. whereas the rest of the alkoxide existed as dissolved state in octanol. The droplets are stabilized with stabilizer (HPC). In the next step. hydrolysis and condensation reactions of the alkoxide droplets decrease the size of droplets and, at the same time, fine particles are formed from the alkoxide dissolved in octanol. Subsequently, the final particles are produced by aggregation between the large particles through the droplet form and the fine particles.
C_(1)-HVOCs 제거를 위한 Ru-Sn/γ-Al_(2)O_(3) 촉매 제조 및 반응성 평가
김영주,황운연,구기갑,김용렬,박종수,윤왕래 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1
HVOCs 제거에 사용되는 백금-팔라듐계보다 저렴한 촉매 개발을 목적으로 다양한 루테늄계 촉매를 제도하여 C_(1)-HVOCs 분해 특성 평가 실험을 수행하였다. 그 결과 Ru[2]-Sn[2]/γ-Al_(2)O_(3) 촉매가 가장 우수한 성능을 보였다. 구조 증진제인 주석은 흡착 산소의 양을 증가시키고, 다양한 산소 이온 종의 생성에 기여함을 알 수 있었다. HVOCs 분해 반응에 첨가되는 산소 원자는 주로 루테늄과 주석에 흡착되며, CH_(3) 등 HVOCs는 지지체인 γ-Al_(2)O_(3)의 브뢴스테드 및 루이스 산점에 흡착됨을 알 수 있었다. 흡착된 HVOCs의 염소와 브뢴스테드 산점의 수소 화학 결합에 의한 HCl의 생성 반응이 HVOCs 분해의 주 반응 기구임을 알 수 있었다. Various ruthenium(Ru) based catalysts, which were less expensive than Pt-Pd based catalysts, were prepared and their activity with C_(1)-HVOCs(Halogenated Volatile Organic Compounds) was evaluated. Ru[2]-Sn[2]/γ-Al_(2)O_(3) was found to have the most desirable effect on the destruction of HVOCs. Tin taken as a structural promoter was found to increase the amount of oxygen adsorption and to generate various oxygen ions. Oxygen atoms were found to be mainly adsorbed on the surface of ruthenium and tin and HVOCs such as CH_(3)Cl to adsorbed on Bronsted and Lewis acid sites of γ-Al_(3)O_(3) supports. It was found that the formation of HCl by the reaction of chlorine in HVOCs with hydrogen atom on Bronsted acid site was the main reaction mechanism in the destruction of HVOCs.
주의력결핍과잉행동장애와 Alpha-1C-Adrenergic 수용체 유전자와의 연관성에 대한 연구
조수철,김재원,김붕년,황준원,박미라,김순애,조대연,유희정,정운선,손정우,박태원 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.1
Objectives : Neurobiological and pharmacological research has suggested that the dysregulation of the central noradrenergic systems might be involved in the pathophysiology of ADHD. The aim of this study was to examine the association of the alpha-1C-adrenergic receptor gene (ADRA1C) with ADHD in Korean subjects. Methods : In a case-control study, we assessed 186 DSM-IV ADHD probands and 150 normal controls. One hundred and eight trios were studied in a family-based association analysis. Psychiatric diagnoses were derived through structured diagnostic interviews. For the clinical evaluation of the ADHD subjects, the Child Behavior Checklist (CBCL), the ADHD Rating Scale-IV (ARS) and the Junior Temperament and Character Inventory (JTCI) were administered. A computerized continuous performance test (CPT) was used to measure the inattention and impulsivity of the ADHD children. Results : There were no significant differences in the genotype or allele frequencies of the ADRA1C PstI polymorphism between the ADHD and control group (p>0.05). The transmission disequilibrium test (TDT) analysis observed no evidence for biased transmission of any of the alleles of the PstI polymorphism. There were no significant differences in the CPT or JTCI profiles between those ADHD subjects with the CC genotype and those with the other (CT+TT) genotypes at the PstI polymorphism. Conclusion : The results of this study do not support the ADRA1C as a major genetic susceptibility factor in ADHD.
Mapping of qBK1, a major QTL for bakanae disease resistance in rice
Hur, Yeon-Jae,Lee, Sais Beul,Kim, Tae Heon,Kwon, Tackmin,Lee, Jong-Hee,Shin, Dong-Jin,Park, Soo-Kwon,Hwang, Un-Ha,Cho, Jun Hyeon,Yoon, Young-Nam,Yeo, Un-Sang,Song, You-Chun,Kwak, Do-Yeon,Nam, Min-Hee Springer-Verlag 2015 Molecular breeding Vol.35 No.2
졸-겔법에 의한 구형 mullite 전미분체의 제조 및 mullite 화 공정기구의 해석 1. 졸 - 겔 공정변수가 mullite 전미분체의 제조와 mullite 화에 미치는 영향
황운연(Un Yeon Hwang),이승구(Seung Gu Lee),구기갑(Kee Kahb Koo),박형상(Hyung Sang Park),유승준(Seung Joon Yoo),윤호성(Ho Sung Yoon) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.3
In this study, spherical fine pre-mullite particles were prepared by partial hydrolysis method to control the reaction rate difference of two alkoxides and by mixed solvent method to control the particle shape. The optimum conditions for preparing spherical pre-mullite particles were; ([TEOS]= 0.0333 ㏖/ℓ, [ASB] =0.1 ㏖/ℓ, [H₂O] =0.5 ㏖/ℓ, [acetonitrile]= 40 vo1%, [HPC] 0.l g/ℓ). A1₂O₃ : SiO₂ molar ratio of pre-mullite particles determined by XRF analysis was about 3:2. Mullitization reactions were studied by DTA, XRD, and FT-IR analysis. Pre-mullite particles were determined amorphous by XRD analysis, and all pre-mullite powders showed an exothermic peak around 990 ℃ on DTA analysis associated with crystallization to spinel phase. The samples passing through the spinel phase were transformed into the T-mullite at around 1,100 ℃ and the transformation to O-mullite took place about 1,250 ℃. [H₂O]/[Si-alkoxide] molar ratio added in the partial hydrolysis reaction had an important effect upon the mullitization of pre-mullite powder, the pre-mullite particles of the highest degree of SiO-Al bonding were obtained when [H₂O]/[Si-alkoxide] was I and the particles crystallized to O-mullite at low temperature (1224.43 ℃) than other particles.
QTL analysis of the qBK1, a major QTL for bakanae disease resistance in rice
Yeon-Jae Hur,Saes-Beul Lee,Tae-Heon Kim,Jong-Hee Lee,Dong-Jin Shin,Soo-Kwon Park,Woon-Ha Hwang,Sang-Ik Han,Jun-Hyun Cho,Young-Nam Yoon,Un-Sang Yeo,You-Chun Song,Min-Hee Nam,Dong-Soo Park 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Bakanae disease is one of the most serious and oldest problems of rice production, which was first described in 1828 in Japan (Ito and Kimura 1931). This disease may infect rice plants from the pre-emergence stage to the mature stage, with severe infection of rice seeds resulting poor germination or withering (Iqbal et al. 2011). Under favorable environmental conditions, infected plants have the capacity to produce numerous conidia that subsequently infect proximate healthy plants, resulting in major yield loss (Ou 1985). One hundred sixty nine NILs, YR28297 (BC6F4) generated by five backcrosses of Shingwang with the genetic background of susceptible japonica variety, Ilpum were used for QTL analysis. Rice bakanae disease pathogen, CF283, was mainly used in this study and inoculation and evaluation of bakanae disease was performed with the method of the large-scale screening method developed by Kim et al. (2014). A major QTL for resistance against bakanae disease on chromosome 1 was identified using SSR marker, RM9, which explaining 65 % of the total phenotype variation. The major QTL designated as qBK1 and mapped to a 4.4 Mbp region between RM24 (19.30 Mb) and RM11295 (23.72 Mb). The results of this study are expected to provide useful information toward developing resistant rice lines to this detrimental fungal disease.
Identification of a major quantitative trait locus for bakanae disease resistance in rice
Yeon-Jae Hur,Saes-Beul Lee,Tae-Heon Kim,Jong-Hee Lee,Dong-Jin Shin,Soo-Kwon Park,Woon-Ha Hwang,Sang-Ik Han,Jun-Hyun Cho,Young-Nam Yoon,Un-Sang Yeo,You-Chun Song,Min-Hee Nam,Dong-Soo Park 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Bakanae disease incidence threat is an increasing trend in the top rice growing countries. Despite it is essential to identify the resistant genes and underlying mechanisms of bakanae disease to develop resistant varieties, there are very limited genetic studies on bakanae disease in rice. The indica rice variety Shingwang was selected as resistant donor to bakanae disease. One hundred sixty nine NILs, YR28297 (BC6F4) generated by five backcrosses of Shingwang with the genetic background of susceptible japonica variety, Ilpum were used for QTL analysis. Rice bakanae disease pathogen, CF283, was mainly used in this study and inoculation and evaluation of bakanae disease was performed with the method of the large-scale screening method developed by Kim et al. (2014). The proportion of healthy plants of Shingwang and Ilpum after inoculation was confirmed using bakanae disease pathogen, CF283. While inoculated Ilpum showed thin and yellowish-green phenotype which is typical symptom of Bakanae disease, Shingwang showed similar healthy phenotype with control plants. A major QTL for resistance against bakanae disease on chromosome 1 was identified using SSR marker, RM9, which explaining 65 % of the total phenotype variation. The major QTL designated as qBK1 and mapped to a 4.4 Mbp region between RM24 (19.30 Mb) and RM11295 (23.72 Mb). The information of qBK1 could be useful for improving rice bakanae disease resistance in marker-assisted breeding.
[P5-51] Development of a Species Specific-PCR Method for Rapid Identification of Bacillus cereus
Ji Yeon Lee,Gun-Hee Kwon,Hwang A Lee,Ji Yeong Park,Chang Un Baek,Hyeon Deok Jo,Kang Wook Lee,Joo Yeon Kim,Chun-Seok Park,Dae Young Kwon,Jinkyu Lim,Jong-Sang Kim,Jeong Hwan Kim 한국식품영양과학회 2009 한국식품영양과학회 학술대회발표집 Vol.2009 No.11