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Agrobacterium larrymoorei와 A. tumefaciens에 의한 벤자민고무나무 뿌리혹병
이영기,명인식,구한모,차재순,황혜경,황태호 한국식물병리학회 2006 식물병연구 Vol.12 No.3
Crown gall on lower stem of weeping fig (Ficus benjamina Roxb.) was first observed at Daejon in 2003. Tumors were about 15 cm in size and semi-round with rough surface texture of dark brown color. Two virulent isolates among ten bacteria isolated from the tumor tissues were characterized. Their colonies were convex, glistening, circular with an entire edge, and white or tannish cream in color on potato dextrose agar supplemented with 0.5% CaCO3. They were rod shape with peritrichous flagellae, gram-negative, aerobic growth, oxidase-positive, and grew on D1M agar. The isolates were identified as Agrobacterium larrymoorei and A. tumefaciens based on biochemical and physiological characteristics, fatty acid profiles and substrate utilization patterns. Seedlings of some host plants excepting grapevine produced typical galls two to three weeks after inoculation with cell suspensions of the virulent strains. This is the first report on crown gall of weeping fig in Korea.
Eu 부활형 Sr-Al-O 계 장잔광 형광체의 합성과 잔광특성
이영기,김정열,김병규,유연태,Lee, Young-Ki,Kim, Jung-Yeul,Kim, Byung-Kyu,Yu, Yeon-Tae 한국재료학회 1998 한국재료학회지 Vol.8 No.8
$SrAI_2O_4:Eu^{2+}$를 합성하여 장잔광 축광재료로서 가장 중요한 발광특성과 장잔광특성을 조사하였다. 융제로서 $B_2O_3$를 3wt% 첨가한 $SrCO_3$, $Eu_2O_3$, $AI_2O_34의 혼합분말은 $1000^{\circ}C$이상에서 모체결정인 $SrAl_2O_4$의 단일상이 형성되었으나, 장잔관 형광체로서 최적의 합성조건은 $1300^{\circ}C$, 3시간이었다. 그리고 $SrAI_2O_4:Eu^{2+}$는 부활제인 $Eu^{2+}$의 $4f^65d^1$ $\rightarrow$$4f^7$천이에 기인하여 황록색발광영역의 520nm(2.384eV)를 최대 발파장으로 하는 450~650nm의 폭넓은 발광스펙트럼을 보였으며, 또한 발광파장을 520nm로 고정하여 측정한 여기스펙트럼의 최대 흡수피크는 360nm이고 250nm에서 480nm의 넓은 범위에서 흡수스펙트럼이 관찰되었다. The synthesis of $SrAI_2O_4:Eu^{2+}$ phosphor and its properties of both photoluminescence and long-phosphorescent were investigated as a function of sintering condition. Single phase of $SrAl_2O_4$ was obtained by sintering the mixtures of $SrCO_3$, $Eu_2O_3$, $AI_2O_34 and 3wt% $B_2O_3$ powders over 100$0^{\circ}C$ in Ar/H2 atmosphere. The optimum sintering condition for the long-phosphorescent phosphor of $SrAI_2O_4:Eu^{2+}$ was found at 130$0^{\circ}C$ for 3hours. The PL emission spectrum of $SrAI_2O_4:Eu^{2+}$ shows a maximum peak intensity at 520nm(2.384eV) with a broad emission extending from 450 to 650nm which resulted from the $4f^65d^1$$\rightarrow$$4f^7$ transition of $Eu^{+2}$ under 360nm exitation. Monitored at 520nm. the excita¬tion spectrum of $SrAI_2O_4:Eu^{2+}$ exhibits a maximum peak intensity at 360nm (3.44eV) with a broad absorption band extending from 250 to 480nm.