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Visible luminescence of nanocrystalline AlN:Er thin film by co-deposition of AlN, Er, and SiO2
J.-W. Lim,W. Takayama,Y.F. Zhu,J.W. Bae,J.F. Wang,S.Y. Ji,K. Mimura,J.H. Yoo,M. Isshiki 한국물리학회 2007 Current Applied Physics Vol.7 No.3
We report a visible luminescence of Er3+ ions in an amorphous-nanocrystalline AlN:Er thin lm prepared by co-deposition usingAlN, Er, and SiO2 3+ in the AlN:Er lm annealed at 750.C showed a strong bluish green emissionof Er3+ in the amorphous-nanocrystalline AlN:Er thin lm, which is attributed to the intra-4fEr3+ transitions of2H11/2!4I15/2 and4F7/2!4I15/2The occurrence of the strong Er3+ emission in the annealed AlN:Er thin lm with a mixture of amorphous and nanocrystalline phasesmay be contributed to an increase in the number of excitation Er3+ centers and a presence of oxygen related to Er3+ excitation andrecombination process in the AlN:Er thin film.
Lee, J,Bathany, C,Ahn, Y,Takayama, S,Jung, W IOP Publishing 2016 Laser physics letters Vol.13 No.2
<P>We present a volumetric monitoring method to observe the morphological changes of aqueous two phase system (ATPS) droplets in a microfluidic system. Our method is based on time-lapse optical coherence tomography (OCT) which allows the study of the dynamics of ATPS droplets while visualizing their 3D structures and providing quantitative information on the droplets. In this study, we monitored the process of rehydration and deformation of an ATPS droplet in a microfluidic system and quantified the changes of its volume and velocity under both static and dynamic fluid conditions. Our results indicate that time-lapse OCT is a very promising tool to evaluate the unprecedented features of droplet-based microfluidics.</P>
Mini Review : The art of reporter proteins in science: past, present and future applications
( Cheol Min Ghim ),( Sung Kuk Lee ),( Shuichi Takayama ),( Robert J. Mitchell ) 생화학분자생물학회 (구 한국생화학분자생물학회) 2010 BMB Reports Vol.43 No.7
Starting with the first publication of lacZ gene fusion in 1980, reporter genes have just entered their fourth decade. Initial studies relied on the simple fusion of a promoter or gene with a particular reporter gene of interest. Such constructs were then used to determine the promoter activity under specific conditions or within a given cell or organ. Although this protocol was, and still is, very effective, current research shows a paradigm shift has occurred in the use of reporter systems. With the advent of innovative cloning and synthetic biology techniques and microfluidic/nanodroplet systems, reporter genes and their proteins are now finding themselves used in increasingly intricate and novel applications. For example, researchers have used fluorescent proteins to study biofilm formation and discovered that microchannels develop within the biofilm. Furthermore, there has recently been a “fusion” of art and science; through the construction of genetic circuits and regulatory systems, researchers are using bacteria to “paint” pictures based upon external stimuli. As such, this review will discuss the past and current trends in reporter gene applications as well as some exciting potential applications and models that are being developed based upon these remarkable proteins. [BMB reports 2010; 43(7): 451-460]