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Author: jeeseong hwang

Displaying records 11 to 20 of 46 records.
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11. Probing Dynamic Fluorescence Properties of Single and Clustered Quantum Dots Towards Quantitative Biomedical Imaging of Cells
Published: 10/28/2009
Authors: Hyeong Gon Kang, Fuyuki Tokumasu, Matthew Lawrence Clarke, Zhenping Zhou, Jianyong Tang, Tinh Nguyen, Jeeseong Hwang
Abstract: We present results on dynamical fluorescence properties of bioconjugated nanocrystals or quantum dots (QDs) in different chemical and physical environments. A variety of QD samples were prepared and compared: isolated individual QDs, QDs aggregated ...

12. Multimodal, Nanoscale, Hyperspectral Imaging Demonstrated on Heterostructures of Quantum Dots and DNA-Wrapped Single-Wall Carbon Nanotubes
Published: 10/21/2009
Authors: Hyeong Gon Kang, Matthew Lawrence Clarke, Jianyong Tang, John Taylor Woodward IV, Shin G. Chou, Zhenping Zhou, Angela R Hight Walker, Tinh Nguyen, Jeeseong Hwang
Abstract: A multimodality imaging technique integrating atomic force, polarized Raman, and fluorescence lifetime microscopy and a 2D autocorrelation image analysis is applied to study the properties of a mesoscopic heterostucture of nanoscale materials. This ...

13. NIST s Integrated Colony Enumerator (NICE)
Published: 8/11/2009
Authors: Matthew Lawrence Clarke, Jeeseong Hwang
Abstract: Enumeration of bacterial colonies in an agar plate is simple in concept, but automated colony counting is difficult due to variations in colony color, size, shape, contrast, and density, as well as colony overlap. Furthermore, in applications where ...

14. Quantitative Characterization of Quantum Dot-labeled Lambda Phage for Escherichia coli Detection
Published: 7/24/2009
Authors: Peter Yim, Matthew Lawrence Clarke, Michael McKinstry, Silvia Helena De Paoli Lacerda, Leonard F. Pease III, Marina A. Dobrovolskaia, Hyeong Gon Kang, David Thomas Read, Shanmuga Sozhamannan, Jeeseong Hwang
Abstract: We rapidly and quantitatively detect biological pathogens by combining the specificity of bacteriophage lambda with the sensitivity of CdSe/ZnS quantum dot (QD)-based fluorescence. Specifically, QD-decorated lambda phages bind to and allow detection ...

15. Water Soluble DNA-Wrapped Single-Walled Carbon Nanotube/Quantum Dot Complexes
Published: 7/23/2008
Authors: Zhenping Zhou, Hyeong Gon Kang, Jeffrey A Fagan, Alexander J. Shapiro, Matthew Lawrence Clarke, Jeeseong Hwang, Tinh Nguyen

16. Probing the dynamic fluorescence properties of single water-soluble quantum dots
Published: 4/1/2008
Authors: J R Krogmeier, Hyeong Gon Kang, Matthew Lawrence Clarke, p Yim, Jeeseong Hwang
Abstract: The influence of surface modifications, including carboxyl-, amine-, and mercaptoundecanoicacid-functionalized chemistries, on the dynamic fluorescence properties of single quantum dots (QDs) are probed using a combined confocal fluorescence microsco ...

17. Biophotonic tools in cell and tissue diagnostics
Series: Journal of Research (NIST JRES)
Published: 5/1/2007
Authors: Michael Brownstein, Robert A Hoffman, Richard Levenson, Thomas E Milner, Marla L Dowell, Paul A Williams, Grady S. White, Adolfas Kastytis Gaigalas, Jeeseong Hwang
Abstract: In order to maintain the rapid advance of biophotonics in the U.S. and to enhance our competitiveness worldwide, key measurement tools must be in place. As a part of a wide-reaching effort to improve the U.S. technology base, the National Institute o ...

18. Nanocrystal-Based Biomimetic System for Quantitative Flow Cytometry
Published: 2/6/2007
Authors: Marina Dobrovolskaia, Hyeong Gon Kang, Matthew Lawrence Clarke, Anil Patri, Jeeseong Hwang
Abstract: Flow cytometry has been instrumental in rapid analysis of single cells since the 1970s. One of the common approaches is the immunofluorescence study involving labeling of cells with antibodies conjugated to organic fluorophores. More recently, as th ...

19. Fluorescence Intermittency and Spectral Shifts of Single Bio-Conjugated Nanocrystals Studied by Single Molecule Confocal Fluorescence Microscopy and Spectroscopy
Published: 1/21/2007
Authors: Hyeong Gon Kang, Mathew Maye, Dmytro Nykypanchuk, Matthew Lawrence Clarke, Peter Yim, J R Krogmeier, Kimberly A Briggman, Oleg Gang, Jeeseong Hwang
Abstract: We have fabricated a combined measurement system capable of confocal microscopy and fluorescence spectroscopy to simultaneously evaluate multiple optical characteristics of single fluorescent nanocrystals. The single particle detection sensitivity is ...

20. Hunting the Origins of Line Width Roughness with Chemical Force Microscopy
Published: 1/1/2007
Authors: John Taylor Woodward IV, Jeeseong Hwang, V and Choi Prabhu

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