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나노 은 콜로이드 입자의 안정성에 대한 $NaBH_4$ 및 Laponite의 영향
이정백,김동환,서재석,김유혁,Lee, Jung-Baek,Kim, Dong-Hwan,Seo, Jae-Seok,Kim, You-Hyuk 한국결정성장학회 2006 한국결정성장학회지 Vol.16 No.6
본 연구에서는 수용액에서 화학적 환원 방법을 사용하여 나노미터 수준의 은을 합성하는데 있어서 입자크기 및 응집에 영향을 줄 수 있는 $NaBH_4$의 농도, 반응 온도, 반응물 첨가속도 및 laponite의 농도에 대하여 연구하였다. laponite가 없는 조건하에서는 $NaBH_4/AgNO_3$의 몰 비가 3일 때 안정한 나노 은 졸이 형성되었으며 또한 환원반응의 온도가 증가 할수록 은 입자의 평균 크기는 증가하였다. 또한 $AgNO_3$의 첨가속도가 빠르면 초기반응단계에서 형성된 높은 농도의 은 입자들이 응집되어 입자크기가 큰 나노 은이 생성됨을 보여 주고 있다. 보호층 콜로이드로 laponite를 사용하였을 때 고온 $(>\;100^{\circ}C)$에서 안정한 나노 은 졸을 합성할 수 있었다. The synthesis and characterization of silver colloidal nanoparticles by chemical reduction of silver ions in aqueous $AgNO_3$ using sodium borohydride $(NaBH_4)$ as the reducing agent are described. The experimental conditions for aggregation and paricle size of nanosilver particles in water is investigated in terms of concentration of $NaBH_4$, reaction temperature, dropping rate of $AgNO_3$ and concentration of laponite. Stable nanosilver sol is obtained at three molar ratio of $NaBH_4/AgNO_3$ in conditions of without laponite. The size of nanosilver particles is increased as the reaction temperature is increased. The large size of nanosilver sol is obseved as the dropping rate of $AgNO_3$ is increased due to the aggregation of initial high local concentration of nanosilver particles. Stable nanosilver sol at high temperature $(>\;100^{\circ}C)$ can be prepared when laponite is used as protective colloid.
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YBO<sub>3</sub>: Tb 형광체의 광특성에 대한 La<sup>3+</sup> 및 Ce<sup>3+</sup> 이온의 영향
온지원,이정백,김유혁,On, Ji-Won,Lee, Jeong-Baek,Kim, You-hyuk 한국재료학회 2003 한국재료학회지 Vol.13 No.8
In the present investigation, $La^{3+}$ and $Ce^{V}$ ions were substituted for $Y^{3+}$ in the $YBO_3$: Tb in various concentrations. It has been found that these phosphors form solid solutions within limited concentration ranges Excitation and emission spectra under 254 nm and 147 nm were investigated for these phosphors to evaluate influences of $La^{3+}$ and $Ce^{3+}$ ions on brightness and CIE color coordinates. It has been observed that brightness of $(Y, La)BO_3$: Tb under 254 nm and 147 nm when $La^{3+}$ ions are added show an increase of 2.7 times and 1.25 times, respectively. On the other hand, emission intensities of peaks in $Y_{0.8-x}$ $BO_3$: $Tb_{0.2}$ , $Ce_{x}$ show continuos decrease as $Ce^{3+}$ / content is increased from 0 to 0.4. CIE color coordinates of prepared phosphors show yellowish green which is needed to be improved to be used for display applications.
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1969年 韓國에서 流行한 콜레라 菌株에 關한 硏究(第2報)
張鶴來,崔大卿,李楨伯,柳駿 최신의학사 1969 最新醫學 Vol.12 No.12
As mentioned on the previous report about the studies on cholera, trypsin test, hexamine test and phage typing with cholera phage type. IV were added there-after, to confirm the identity of cholera vibrio. From the above test results, no contradictory data were obtained to the conclusion of the first report in which the etiological agent was identified as V. cholerae biotype El tor, serotype ogawa. Hemolysis test and polymyxin B sensitivity test were performed in more detail. On hemolysis test, when Feeley's method, instead of Greig's method, was carried out with 375 strains including two classic' cholera controls and three El for cholera controls, about 55 strains showed hemolysis. Besides these, 2 classic controls showed hemolysis positive. From these data, author suggested the hemolysis test as a poor differentiating method inbetween True and El for cholera. On polymyxin B sensitivity test, author inoculated the strains under test and controls on the media containing polymyxin B serially diluted. Two True cholera strains were inhibited on 4' gamma, whereas two El tor controls and strains under test were resisted even on 100 gamma. It was found the inhibitory range of polymixin B. (between true and El for cholera was) broad enough. And polymyxin B sensitivity test was recommandable as a relatively preferable test method on this occasion.
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넙치 , Paralichthys oliuaceus 자어에서 분리한 장관백독증의 원인균인 Vibrio sp. 의 생물학적 및 생화학적 특성
노섬,송춘복,이정백 한국어병학회 1995 한국어병학회지 Vol.8 No.2
1991年 12月에서 1992年 4月 사이에 제주도내 종묘배양장에서 사육중이던 넙치자어에서 소화관이 백탁되거나 궤양을 일으키는 질병이 발생하여 대량폐사를 일으켰다. 병든 자어의 소화관으로부터 Vibrio 屬 세균을 분리하였고, 形態學的, 生物學的 및 生化學的 性狀을 조사한 결과, 본병의 원인균을 Vibrio sp. INFL group으로 동정하였다. 본병은 rotifer 等의 먹이생물을 매개로 하여 경구감염시킨 결과 자연감염 증상이 재현되었다. 분리균이 잘 발육할 수 있는 온도의 범위는 25∼30℃, 식염농도의 범위는 2.0∼4.0% 그리고 pH는 6.0∼8.0이었다. 분리균은 oxytetracycline, nalidixic acid, kanamycin 및 novobiocin 등에 감수성을 나타냈으나 ampicillin, erythromycin, spiramycin 및 sulfa-drug에는 내성을 나타내었다. The diseased larvae of the flounder, Paralichthys olivaceus, were sampled several times from a fish hatchery located in Cheju Island between December, 1991 and April, 1992. They turned out to be infected with Vibrio sp. and diagnosed as intestinal necrosis of flounder larvae(INFL) based on morphological, biological, and biochemical examinations. INFL was known to be caused by the live food organism infected with Vibrio sp. The optimal growth conditions of the isolates for temperature, pH, and NaCl concentration were 20∼30℃, 6∼8, and 2∼4%, respectively. In the drug sensitivity test, the isolates were sensitive to oxytetracycline, nalidixic acid, kanamycin, and novobiocin, but resistant to ampicillin, erythromycin, spiramycin and sulfa-drug.
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1969年 韓國에서 流行한 콜레라 菌株에 關한 硏究(第1報)
張鶴來,崔大卿,李楨伯,柳駿 최신의학사 1969 最新醫學 Vol.12 No.10
An attempt has been made to identify the Cholera Vibrio isolated from the Cholera epidemic in Korea on September 1969. 26 strains isolated from Cholera cases in Suh Chun Gun, South Chung Cheong province and in Seoul vicinity were tested in the following biochemical and serological tests. Voges Proskauer reaction, Lysis of sheep cells in plates and tubes, Polymyxin B test (Gan & Tjia), Goppersulfatee flocculation (Wabha & Takla), Tanamal Soda-Serum agglutination, Phenol Red reaction and Chicken red blood cell agglutination, etc. are carried out. The results are on table 1 and table 2. The laboratory data indicate those tested Cholera Vibrio strains as Vibrio ;Cholera biotype El for ogawa except hemolytic activity on sheep blood cells. However, there are many reports on non hemolytic strain of El for cholera and also the hemolytic activity of El for could be tttduced by the various methods. The induction of hemolytic activity of the, isolated Cholera strain and fhe phage typing are being studied at the microbiology department. Although the phage typing and hemolytic activity of the Vibrio Cholera are being investigated, with esent data shown above, the identity.of the Vibrio Cholera is Vibrio Cholerae biotype El tor, serotype
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