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CdSe/ZnS 나노결정 양자점 Pyrolysis 제조와 발광다이오드 소자로의 응용
강승희,키란쿠마르,손기철,허훈회,김경현,허철,김의태,Kang, Seung-Hee,Kumar, Kiran,Son, Kee-Chul,Huh, Hoon-Hoe,Kim, Kyung-Hyun,Huh, Chul,Kim, Eui-Tae 한국재료학회 2008 한국재료학회지 Vol.18 No.7
We report on the light-emitting diode (LED) characteristics of core-shell CdSe/ZnS nanocrystal quantum dots (QDs) embedded in $TiO_2$thin films on a Si substrate. A simple p-n junction could be formed when nanocrystal QDs on a p-type Si substrate were embedded in ${\sim}5\;nm$ thick $TiO_2$ thin film, which is inherently an n-type semiconductor. The $TiO_2$ thin film was deposited over QDs at $200^{\circ}C$ using plasma-enhanced metallorganic chemical vapor deposition. The LED structure of $TiO_2$/QDs/Si showed typical p-n diode currentvoltage and electroluminescence characteristics. The colloidal core-shell CdSe/ZnS QDs were synthesized via pyrolysis in the range of $220-280^{\circ}C$. Pyrolysis conditions were optimized through systematic studies as functions of synthesis temperature, reaction time, and surfactant amount.
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Cell wall hydrolases: Expansion or Senescence in Roses (Rosa hybrida L.)
나빈 쿠마르,기리시 찬드 스비아스타바,키란 딕싯 한국원예학회 2008 Horticulture, Environment, and Biotechnology Vol.49 No.6
Roles of cell wall hydrolases in relation to petal expansion and subsequent senescence in roses were studied. Experiments were conducted in a laboratory at the Indian Agricultural Research Institute, New Delhi, during the year 2005-07. Two cultivars of cut- roses (Rosa hybrida L.), ‘Grandgala’ and ‘First Red’ were obtained from a commercial grower (German Garden), Dharuheda, Haryana, India. Flower stems were harvested at six different developmental stages. Petals were separated from different petal whorls of the flower, outermost to innermost [7 whorls each in both ‘Grandgala’ and ‘First Red’] from all the developmental stages. Opening of the flower bud was accompanied by increased activity of cell wall hydrolases. Activities of polygalactouronase (PG) and pectin methyl esterase (PME) increased up to stage 5 in flower bud development in all the petal whorls and declined thereafter. Higher levels of PME and PG activity were correlated with the flower bud development and petal expansion. The highest level of ethylene production coincided with the peak activity of both enzymes in expanding petals. The PME activity appeared to create an acidic environment within the cell wall that promoted the action of PG, which might cause cell wall loosening and allow turgor driven petal expansion. It seems that both ethylene dependent (S3-S6) and ethylene independent (S1-S2) activities of PME and PG are parts of a highly coordinated cell death program, which follows initial cell wall loosening, expansion, and finally termination of petal life.
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