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| Title: | Localized single molecule isotherms of DNA molecules at confined liquid−solid interfaces |
| Author (s): | Liang, Heng Cheng, Xiaoliang Ma, Yinfa |
| Department/Lab Affiliations: | Center for Environmental Science and Technology (CEST) Chemistry Environmental Research Center |
| Keywords: | liquid-solid interfaces single biological molecules |
| Subject Terms: | Thermodynamics. |
| Issue Date: | 2009-02 |
| Publisher: | American Chemical Society ACS |
| Citation: | Liang, Heng, Cheng, Xiaoliang, and Ma, Yinfa. "Localized Single Molecule Isotherms of DNA Molecules at Confined Liquid-Solid Interfaces." Analytical Chemistry, 2009, 81 (6), pp. 2059-2066. |
| Abstract: | The study of dynamics and thermodynamics of single biological molecules at confined liquid−solid interfaces is crucially important, especially in the case of low-copy number molecules in a single cell. Using a high-throughput single molecule imaging system and Lagrangian coordinates of single molecule images, we discovered that the local equilibrium isotherms of single λDNA molecules at a confined liquid−solid interface varied from a stair type for the regions of single or double molecular DNA to a mild “S” type for the regions of triple molecular DNA spots, which does not agree with the conventional equilibrium isotherms in the literature. Single molecule images in time sequence for different λDNA concentrations were statistically analyzed by measuring preferential partitioning from shearing effects, which were used to measure the local velocity of DNA molecules by directly observing the migration of DNA fluorescence spots for the 12 continuous images. The local linear velocity of hydrodynamic flow was calculated by the Hagen−Poiseuille equation in different microregions with a local Lagrangian approach. The local single molecule isotherms for the tracked molecules in the regions of single, double, or triple molecular DNA layers within the laminar flows were obtained according to the average local velocities of both the stochastic molecule events and the corresponding local Poiseuille flows. A millisecond and microvolume approach to directly determine local single molecule isotherms at confined liquid−solid interfaces was established, and the microspace scale effects on the types of isotherms were discovered. This study may have significant impact on preparations of low-copy number proteins in a single cell, membrane separations, and other bioseparation studies. |
| Type: | Article - Journal text |
| In Title: | Analytical Chemistry |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. Pre-print: author cannot archive; Post-print: author cannot archive; FULL COPYRIGHT INFORMATION: |
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| title | Localized single molecule isotherms of DNA molecules at confined liquid−solid interfaces |
| contributor.author | Liang, Heng |
| contributor.author | Cheng, Xiaoliang |
| contributor.author | Ma, Yinfa |
| contributor.deptlab | Center for Environmental Science and Technology (CEST) |
| contributor.deptlab | Chemistry |
| contributor.deptlab | Environmental Research Center |
| contributor.sponsor | Department of Chemistry at the Missouri University of Science and Technology |
| contributor.sponsor | Environmental Research Center at the Missouri University of Science and Technology |
| contributor.sponsor | National Natural Science Foundation of China |
| subject | liquid-solid interfaces |
| subject | single biological molecules |
| subject.LCSH | Thermodynamics. |
| date.issued | 2009-02 |
| publisher | American Chemical Society ACS |
| identifier.citation | Liang, Heng, Cheng, Xiaoliang, and Ma, Yinfa. "Localized Single Molecule Isotherms of DNA Molecules at Confined Liquid-Solid Interfaces." Analytical Chemistry, 2009, 81 (6), pp. 2059-2066. |
| identifier.pub.URI | |
| description.abstract | The study of dynamics and thermodynamics of single biological molecules at confined liquid−solid interfaces is crucially important, especially in the case of low-copy number molecules in a single cell. Using a high-throughput single molecule imaging system and Lagrangian coordinates of single molecule images, we discovered that the local equilibrium isotherms of single λDNA molecules at a confined liquid−solid interface varied from a stair type for the regions of single or double molecular DNA to a mild “S” type for the regions of triple molecular DNA spots, which does not agree with the conventional equilibrium isotherms in the literature. Single molecule images in time sequence for different λDNA concentrations were statistically analyzed by measuring preferential partitioning from shearing effects, which were used to measure the local velocity of DNA molecules by directly observing the migration of DNA fluorescence spots for the 12 continuous images. The local linear velocity of hydrodynamic flow was calculated by the Hagen−Poiseuille equation in different microregions with a local Lagrangian approach. The local single molecule isotherms for the tracked molecules in the regions of single, double, or triple molecular DNA layers within the laminar flows were obtained according to the average local velocities of both the stochastic molecule events and the corresponding local Poiseuille flows. A millisecond and microvolume approach to directly determine local single molecule isotherms at confined liquid−solid interfaces was established, and the microspace scale effects on the types of isotherms were discovered. This study may have significant impact on preparations of low-copy number proteins in a single cell, membrane separations, and other bioseparation studies. |
| type | Article - Journal |
| type.DCMIType | text |
| relation.isPartOf | Analytical Chemistry |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights | Pre-print: author cannot archive; Post-print: author cannot archive; |
| rights.URI | |
| rights.URI | |
| identifier.persist.URI | |
| date.available | 2009-03-16T21:49:35Z |