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Scalable Production of Sensor Arrays Based on High-Mobility Hybrid Graphene Field Effect Transistors
Gao, Zhaoli,Kang, Hojin,Naylor, Carl H.,Streller, Frank,Ducos, Pedro,Serrano, Madeline D.,Ping, Jinglei,Zauberman, Jonathan,Rajesh,Carpick, Robert W.,Wang, Ying-Jun,Park, Yung Woo,Luo, Zhengtang,Ren, American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.41
<P>We have developed a scalable fabrication process for the production of DNA biosensors based on gold nanoparticle-decorated graphene field effect transistors (AuNP-Gr-FETs), where monodisperse AuNPs are created through physical vapor deposition followed by thermal annealing. The FETs are created in a four-probe configuration, using an optimized bilayer photolithography process that yields chemically clean devices, as confirmed by XPS and AFM, with high carrier mobility (3590 +/- 710 cm2/V.s) and low unintended doping (Dirac voltages of 9.4 +/- 2.7 V). The AuNP-Gr-FETs were readily functionalized with thiolated probe DNA to yield DNA biosensors with a detection limit of 1 nM and high specificity against noncomplementary DNA. Our work provides a pathway toward the scalable fabrication of high-performance AuNP-Gr-FET devices for label-free nucleic acid testing in a realistic clinical setting.</P>
레이저를 이용한 밀리미터 스케일 와동 발생에 대한 연구
이은도(Uen Do Lee),곽영태(Young Tae Guahk),신현동(Hyun Dong Shin),Jonathan H. Frank,Sebastial A. Kaiser 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Laser-induced vortex generation was studied in a millimeter scale nozzle. Acetone, carried by nitrogen, was ejected through a axisymmetirc nozzle of 1 ㎜ inner diameter and 193㎚ ArF excimer laser beam was irradiated for the photolysis of the seeded acetone. The pressure perturbation from the laser photolysis is trigger the development of a small scale vortex. The pressure perturbation can make very repeatable vortex because the pressure disturbance is highly localized and has short-duration. The temporal evolution of the vortex was imaged by using acetone laser-induced fluorescence (LIF). The experiment was conducted in an atmospheric pressure and room temperature.
아세톤 광분해를 이용한 Molecular Tagging Velocimetry
이은도(Uen Do Lee),신현동(Hyun dong Shin),Jonathan H. Frank,Sebastian A. Kaiser 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Acetone molecular tagging velocimetry (MTV) was studied in a mini-jet configuration. Radial profile of the axial velocity at 2 ㎜ duct outlet is measured using acetone MTV. For the measurement, acetone is seeded into the flow, and a pulsed ArF (λ = 193 ㎚) excimer laser photodissociates the acetone along a narrow line. The excimer laser "tag" a line that is deficient in acetone and the line is "read" by planar laser fluorescence (PLIF) imaging of acetone using the frequency-doubled dye laser for excitation. This line is convected with the flow, and its displacement is measured from a pair of PLIF images acquired with different delay times between the excimer and dye lasers. The axial velocity is extracted from the cross correlation of the two PLIF images.
A Plant Immune Receptor Detects Pathogen Effectors that Target WRKY Transcription Factors
Sarris, Panagiotis F.,Duxbury, Z.,Huh, S.,Ma, Y.,Segonzac, C.,Sklenar, J.,Derbyshire, P.,Cevik, V.,Rallapalli, G.,Saucet, Simon B.,Wirthmueller, L.,Menke, Frank L.H.,Sohn, K.,Jones, Jonathan D.G. Cell Press ; MIT Press 2015 Cell Vol.161 No.5
Defense against pathogens in multicellular eukaryotes depends on intracellular immune receptors, yet surveillance by these receptors is poorly understood. Several plant nucleotide-binding, leucine-rich repeat (NB-LRR) immune receptors carry fusions with other protein domains. The Arabidopsis RRS1-R NB-LRR protein carries a C-terminal WRKY DNA binding domain and forms a receptor complex with RPS4, another NB-LRR protein. This complex detects the bacterial effectors AvrRps4 or PopP2 and then activates defense. Both bacterial proteins interact with the RRS1 WRKY domain, and PopP2 acetylates lysines to block DNA binding. PopP2 and AvrRps4 interact with other WRKY domain-containing proteins, suggesting these effectors interfere with WRKY transcription factor-dependent defense, and RPS4/RRS1 has integrated a ''decoy'' domain that enables detection of effectors that target WRKY proteins. We propose that NB-LRR receptor pairs, one member of which carries an additional protein domain, enable perception of pathogen effectors whose function is to target that domain.