251
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Wang W, Shen H, Moringo NA, Carrejo NC, Ye F, Robinson JT, Landes CF. Super-Temporal-Resolved Microscopy Reveals Multistep Desorption Kinetics of α-Lactalbumin from Nylon. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6697-6702. [PMID: 29763567 DOI: 10.1021/acs.langmuir.8b00686] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Insight into the mechanisms driving protein-polymer interactions is constantly improving due to advances in experimental and computational methods. In this study, we used super-temporal-resolved microscopy (STReM) to study the interfacial kinetics of a globular protein, α-lactalbumin (α-LA), adsorbing at the water-nylon 6,6 interface. The improved temporal resolution of STReM revealed that residence time distributions involve an additional step in the desorption process. Increasing the ionic strength in the bulk solution accelerated the desorption rate of α-LA, attributed to adsorption-induced conformational changes. Ensemble circular dichroism measurements were used to support a consecutive reaction mechanism. Without the improved temporal resolution of STReM, the desorption intermediate was not resolvable, highlighting both STReM's potential to uncover new kinetic mechanisms and the continuing need to push for better time and space resolution.
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Affiliation(s)
- Wenxiao Wang
- Department of Electrical and Computer Engineering , Rice University , MS 366 , Houston , Texas 77251-1892 , United States
| | - Hao Shen
- Department of Chemistry , Rice University , MS 60 , Houston , Texas 77251-1892 , United States
| | - Nicholas A Moringo
- Department of Chemistry , Rice University , MS 60 , Houston , Texas 77251-1892 , United States
| | - Nicole C Carrejo
- Department of Chemistry , Rice University , MS 60 , Houston , Texas 77251-1892 , United States
| | - Fan Ye
- Department of Electrical and Computer Engineering , Rice University , MS 366 , Houston , Texas 77251-1892 , United States
| | - Jacob T Robinson
- Department of Electrical and Computer Engineering , Rice University , MS 366 , Houston , Texas 77251-1892 , United States
- Department of Bioengineering , Rice University , MS 142 , Houston , Texas 77251-1892 , United States
| | - Christy F Landes
- Department of Electrical and Computer Engineering , Rice University , MS 366 , Houston , Texas 77251-1892 , United States
- Department of Chemistry , Rice University , MS 60 , Houston , Texas 77251-1892 , United States
- Smalley-Curl Institute , Rice University , Houston , Texas 77251 , United States
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252
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Zhao W, Sun Y, Wang Y, Qiu L, Shao R, Cui H. Three-dimensional super-resolution correlation-differential confocal microscopy with nanometer axial focusing accuracy. OPTICS EXPRESS 2018; 26:15759-15768. [PMID: 30114832 DOI: 10.1364/oe.26.015759] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 05/27/2018] [Indexed: 06/08/2023]
Abstract
We present a correlation-differential confocal microscopy (CDCM), a novel method that can simultaneously improve the three-dimensional spatial resolution and axial focusing accuracy of confocal microscopy (CM). CDCM divides the CM imaging light path into two paths, where the detectors are before and after the focus with an equal axial offset in opposite directions. Then, the light intensity signals received from the two paths are processed by the correlation product and differential subtraction to improve the CM spatial resolution and axial focusing accuracy, respectively. Theoretical analyses and preliminary experiments indicate that, for the excitation wavelength of λ = 405 nm, numerical aperture of NA = 0.95, and the normalized axial offset of uM = 5.21, the CDCM resolution is improved by more than 20% and more than 30% in the lateral and axial directions, respectively, compared with that of the CM. Also, the axial focusing resolution important for the imaging of sample surface profiles is improved to 1 nm.
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253
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Guo M, Chandris P, Giannini JP, Trexler AJ, Fischer R, Chen J, Vishwasrao HD, Rey-Suarez I, Wu Y, Wu X, Waterman CM, Patterson GH, Upadhyaya A, Taraska JW, Shroff H. Single-shot super-resolution total internal reflection fluorescence microscopy. Nat Methods 2018; 15:425-428. [PMID: 29735999 PMCID: PMC7470603 DOI: 10.1038/s41592-018-0004-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 03/18/2018] [Indexed: 12/21/2022]
Abstract
We combined instant structured illumination microscopy (iSIM) with total internal reflection fluorescence microscopy (TIRFM) in an approach referred to as instant TIRF-SIM, thereby improving the lateral spatial resolution of TIRFM to 115 ± 13 nm without compromising speed, and enabling imaging frame rates up to 100 Hz over hundreds of time points. We applied instant TIRF-SIM to multiple live samples and achieved rapid, high-contrast super-resolution imaging close to the coverslip surface.
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Affiliation(s)
- Min Guo
- Section on High Resolution Optical Imaging, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA.
| | - Panagiotis Chandris
- Section on High Resolution Optical Imaging, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
| | - John Paul Giannini
- Section on High Resolution Optical Imaging, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
- Biophysics Program, University of Maryland, College Park, MD, USA
| | - Adam J Trexler
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
- Northrop Grumman Corporation, Monterey, CA, USA
| | - Robert Fischer
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Jiji Chen
- Advanced Imaging and Microscopy Resource, National Institutes of Health, Bethesda, MD, USA
| | - Harshad D Vishwasrao
- Advanced Imaging and Microscopy Resource, National Institutes of Health, Bethesda, MD, USA
| | - Ivan Rey-Suarez
- Section on High Resolution Optical Imaging, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
- Biophysics Program, University of Maryland, College Park, MD, USA
| | - Yicong Wu
- Section on High Resolution Optical Imaging, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
| | - Xufeng Wu
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Clare M Waterman
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - George H Patterson
- Section on Biophotonics, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
| | - Arpita Upadhyaya
- Department of Physics and Institute for Physical Science and Technology, University of Maryland, College Park, MD, USA
| | - Justin W Taraska
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA
| | - Hari Shroff
- Section on High Resolution Optical Imaging, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA
- Advanced Imaging and Microscopy Resource, National Institutes of Health, Bethesda, MD, USA
- Department of Physics and Institute for Physical Science and Technology, University of Maryland, College Park, MD, USA
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254
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Hong W, Xu G, Ou X, Sun W, Wang T, Tong Z. Colloidal probe dynamics in gelatin solution during the sol-gel transition. SOFT MATTER 2018; 14:3694-3703. [PMID: 29611569 DOI: 10.1039/c7sm02556d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The dynamics of the colloidal probes in a gelatin solution during the time-dependent sol-gel transition was investigated by multi-particle tracking. The relationship between the relaxation of the medium at the critical gel point and the mean square displacement of the probes was elucidated. Based on this understanding, the critical gel point of gelatin and the corresponding critical exponent n were unambiguously determined by the loss angle criterion and the time-cure superposition. The shift factors of the latter are further used to estimate the time/length-scale evolution of the gelatin during the sol-gel transition. The growth of the medium length scale crossed with the two measuring length scales successively at the pre-gel regime. Coinciding with the length-scale crossovers, the probability density function (PDF) of the probe displacements displayed two transient peaks of non-Gaussianity. In the post-gel regime, the third peak of Gaussianity suggested inhomogeneity in the gel network. The non-Gaussianity results from the bifurcation of diffusivity. The present work showed that the non-Gaussian dynamics of the probes are not the direct equivalence of that of the medium, but an effect of length-scale coupling.
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Affiliation(s)
- Wei Hong
- Research Institute of Materials Science, South China University of Technology, Guangzhou, 510640, P. R. China.
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255
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Pandey P, Panday N, Chang S, Pang P, Garcia J, Wang X, Fu Q, He J. Probing Dynamic Events of Dielectric Nanoparticles by a Nanoelectrode‐Nanopore Nanopipette. ChemElectroChem 2018. [DOI: 10.1002/celc.201800163] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Popular Pandey
- Physics Department Florida International University Miami 33199 United States
| | - Namuna Panday
- Physics Department Florida International University Miami 33199 United States
| | - Shuai Chang
- College of Materials and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China
| | - Pei Pang
- Biodesign Institute Arizona State University Phoenix 85004 United States
| | - Javier Garcia
- Physics Department Florida International University Miami 33199 United States
| | - Xuewen Wang
- Physics Department Florida International University Miami 33199 United States
| | - Qiang Fu
- JiangXi College of Traditional Chinese Medicine Fuzhou 344000 China
| | - Jin He
- Physics Department Florida International University Miami 33199 United States
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256
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Suresh K, Sharma DK, Chulliyil R, Sarode KD, Kumar VR, Chowdhury A, Kumaraswamy G. Single-Particle Tracking To Probe the Local Environment in Ice-Templated Crosslinked Colloidal Assemblies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4603-4613. [PMID: 29554800 DOI: 10.1021/acs.langmuir.7b04120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We use single-particle tracking to investigate colloidal dynamics in hybrid assemblies comprising colloids enmeshed in a crosslinked polymer network. These assemblies are prepared using ice templating and are macroporous monolithic structures. We investigate microstructure-property relations in assemblies that appear chemically identical but show qualitatively different mechanical response. Specifically, we contrast elastic assemblies that can recover from large compressive deformations with plastic assemblies that fail on being compressed. Particle tracking provides insights into the microstructural differences that underlie the different mechanical response of elastic and plastic assemblies. Since colloidal motions in these assemblies are sluggish, particle tracking is especially sensitive to imaging artifacts such as stage drift. We demonstrate that the use of wavelet transforms applied to trajectories of probe particles from fluorescence microscopy eliminates stage drift, allowing a spatial resolution of about 2 nm. In elastic and plastic scaffolds, probe particles are surrounded by other particles-thus, their motion is caged. We present mean square displacement and van Hove distributions for particle motions and demonstrate that plastic assemblies are characterized by significantly larger spatial heterogeneity when compared with the elastic sponges. In elastic assemblies, particle diffusivities are peaked around a mean value, whereas in plastic assemblies, there is a wide distribution of diffusivities with no clear peak. Both elastic and plastic assemblies show a frequency independent solid modulus from particle tracking microrheology. Here too, there is a much wider distribution of modulus values for plastic scaffolds as compared to elastic, in contrast to bulk rheological measurements where both assemblies exhibit a similar response. We interpret our results in terms of the spatial distribution of crosslinks in the polymer mesh in the colloidal assemblies.
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Affiliation(s)
| | - Dharmendar Kumar Sharma
- Department of Chemistry , Indian Institute of Technology Bombay , Powai , Mumbai 400076 , Maharashtra , India
| | - Ramya Chulliyil
- Department of Chemistry , Indian Institute of Technology Bombay , Powai , Mumbai 400076 , Maharashtra , India
| | | | | | - Arindam Chowdhury
- Department of Chemistry , Indian Institute of Technology Bombay , Powai , Mumbai 400076 , Maharashtra , India
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257
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Liu Z, Tjian R. Visualizing transcription factor dynamics in living cells. J Cell Biol 2018; 217:1181-1191. [PMID: 29378780 PMCID: PMC5881510 DOI: 10.1083/jcb.201710038] [Citation(s) in RCA: 118] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 01/03/2018] [Accepted: 01/16/2018] [Indexed: 12/16/2022] Open
Abstract
The assembly of sequence-specific enhancer-binding transcription factors (TFs) at cis-regulatory elements in the genome has long been regarded as the fundamental mechanism driving cell type-specific gene expression. However, despite extensive biochemical, genetic, and genomic studies in the past three decades, our understanding of molecular mechanisms underlying enhancer-mediated gene regulation remains incomplete. Recent advances in imaging technologies now enable direct visualization of TF-driven regulatory events and transcriptional activities at the single-cell, single-molecule level. The ability to observe the remarkably dynamic behavior of individual TFs in live cells at high spatiotemporal resolution has begun to provide novel mechanistic insights and promises new advances in deciphering causal-functional relationships of TF targeting, genome organization, and gene activation. In this review, we review current transcription imaging techniques and summarize converging results from various lines of research that may instigate a revision of models to describe key features of eukaryotic gene regulation.
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Affiliation(s)
- Zhe Liu
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA
| | - Robert Tjian
- Department of Molecular and Cell Biology, Li Ka Shing Center for Biomedical and Health Sciences, California Institute for Regenerative Medicine Center of Excellence, University of California, Berkeley, Berkeley, CA
- Howard Hughes Medical Institute, Berkeley, CA
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258
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Schoch RL, Barel I, Brown FLH, Haran G. Lipid diffusion in the distal and proximal leaflets of supported lipid bilayer membranes studied by single particle tracking. J Chem Phys 2018; 148:123333. [DOI: 10.1063/1.5010341] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Rafael L. Schoch
- Department of Chemical and Biological Physics, Weizmann Institute of Science, P.O. Box 26, Rehovot 7610001, Israel
| | - Itay Barel
- Department of Chemistry and Biochemistry and Department of Physics, University of California, Santa Barbara, Santa Barbara, California 93106, USA
| | - Frank L. H. Brown
- Department of Chemistry and Biochemistry and Department of Physics, University of California, Santa Barbara, Santa Barbara, California 93106, USA
| | - Gilad Haran
- Department of Chemical and Biological Physics, Weizmann Institute of Science, P.O. Box 26, Rehovot 7610001, Israel
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259
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Moringo NA, Shen H, Bishop LDC, Wang W, Landes CF. Enhancing Analytical Separations Using Super-Resolution Microscopy. Annu Rev Phys Chem 2018; 69:353-375. [PMID: 29490205 DOI: 10.1146/annurev-physchem-052516-045018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Super-resolution microscopy is becoming an invaluable tool to investigate structure and dynamics driving protein interactions at interfaces. In this review, we highlight the applications of super-resolution microscopy for quantifying the physics and chemistry that occur between target proteins and stationary-phase supports during chromatographic separations. Our discussion concentrates on the newfound ability of super-resolved single-protein spectroscopy to inform theoretical parameters via quantification of adsorption-desorption dynamics, protein unfolding, and nanoconfined transport.
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Affiliation(s)
| | - Hao Shen
- Department of Chemistry, Rice University, Houston, Texas 77251, USA;
| | - Logan D C Bishop
- Department of Chemistry, Rice University, Houston, Texas 77251, USA;
| | - Wenxiao Wang
- Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77251, USA
| | - Christy F Landes
- Department of Chemistry, Rice University, Houston, Texas 77251, USA; .,Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77251, USA.,Smalley-Curl Institute, Rice University, Houston, Texas 77251, USA
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260
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Gulbahar B, Memisoglu G. CSSTag: Optical Nanoscale Radar and Particle Tracking for In-Body and Microfluidic Systems With Vibrating Graphene and Resonance Energy Transfer. IEEE Trans Nanobioscience 2018; 16:905-916. [PMID: 29364134 DOI: 10.1109/tnb.2017.2785226] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Biological particle tracking systems monitor cellular processes or particle behaviors with the great accuracy. The emissions of fluorescent molecules or direct images of particles are captured with cameras or photodetectors. The current imaging systems have challenges in detection, collection, and analysis of imaging data, penetration depth, and complicated set-ups. In this paper, a signaling-based nanoscale acousto-optic radar and microfluidic multiple particle tracking (MPT) system is proposed based on the theoretical design providing nanoscale optical modulator with vibrating Förster resonance energy transfer and vibrating cadmium selenide/zinc sulfide quantum dots (QDs) on graphene resonators. The modulator combines significant advantages of graphene membranes having wideband resonance frequencies with QDs having broad absorption spectrum and tunable properties. The solution denoted by chirp spread spectrum(CSS) Tag utilizes classical radar target tracking approaches in nanoscale environments based on the capability to generate CSS sequences identifying different bio-particles. Monte Carlo simulations show significant performance for MPT with a modulator of dimension and several picograms of weight, the signal-to-noise ratio in the range from -7 to 10 dB, simple light emitting diode sources with power less than 4 W/cm2 and high speed tracking for microfluidic environments.
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261
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Lee BH, Park HY. HybTrack: A hybrid single particle tracking software using manual and automatic detection of dim signals. Sci Rep 2018; 8:212. [PMID: 29317715 PMCID: PMC5760724 DOI: 10.1038/s41598-017-18569-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 12/13/2017] [Indexed: 02/08/2023] Open
Abstract
Single particle tracking is a compelling technique for investigating the dynamics of nanoparticles and biological molecules in a broad range of research fields. In particular, recent advances in fluorescence microscopy have made single molecule tracking a prevalent method for studying biomolecules with a high spatial and temporal precision. Particle tracking algorithms have matured over the past three decades into more easily accessible platforms. However, there is an inherent difficulty in tracing particles that have a low signal-to-noise ratio and/or heterogeneous subpopulations. Here, we present a new MATLAB based tracking program which combines the benefits of manual and automatic tracking methods. The program prompts the user to manually locate a particle when an ambiguous situation occurs during automatic tracking. We demonstrate the utility of this program by tracking the movement of β-actin mRNA in the dendrites of cultured hippocampal neurons. We show that the diffusion coefficient of β-actin mRNA decreases upon neuronal stimulation by bicuculline treatment. This tracking method enables an efficient dissection of the dynamic regulation of biological molecules in highly complex intracellular environments.
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Affiliation(s)
- Byung Hun Lee
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Korea
| | - Hye Yoon Park
- Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Korea. .,Institute of Applied Physics, Seoul National University, Seoul, 08826, Korea.
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262
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Hansen AS, Woringer M, Grimm JB, Lavis LD, Tjian R, Darzacq X. Robust model-based analysis of single-particle tracking experiments with Spot-On. eLife 2018; 7:33125. [PMID: 29300163 PMCID: PMC5809147 DOI: 10.7554/elife.33125] [Citation(s) in RCA: 137] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 01/03/2018] [Indexed: 12/22/2022] Open
Abstract
Single-particle tracking (SPT) has become an important method to bridge biochemistry and cell biology since it allows direct observation of protein binding and diffusion dynamics in live cells. However, accurately inferring information from SPT studies is challenging due to biases in both data analysis and experimental design. To address analysis bias, we introduce 'Spot-On', an intuitive web-interface. Spot-On implements a kinetic modeling framework that accounts for known biases, including molecules moving out-of-focus, and robustly infers diffusion constants and subpopulations from pooled single-molecule trajectories. To minimize inherent experimental biases, we implement and validate stroboscopic photo-activation SPT (spaSPT), which minimizes motion-blur bias and tracking errors. We validate Spot-On using experimentally realistic simulations and show that Spot-On outperforms other methods. We then apply Spot-On to spaSPT data from live mammalian cells spanning a wide range of nuclear dynamics and demonstrate that Spot-On consistently and robustly infers subpopulation fractions and diffusion constants.
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Affiliation(s)
- Anders S Hansen
- Department of Molecular and Cell Biology, Li Ka Shing Center for Biomedical and Health Sciences, CIRM Center of Excellence, University of California, Berkeley, Berkeley, United States.,Howard Hughes Medical Institute, Berkeley, United States
| | - Maxime Woringer
- Department of Molecular and Cell Biology, Li Ka Shing Center for Biomedical and Health Sciences, CIRM Center of Excellence, University of California, Berkeley, Berkeley, United States.,Unité Imagerie et Modélisation, Institut Pasteur, Paris, France.,UPMC Univ Paris 06, Sorbonne Universités, Paris, France
| | - Jonathan B Grimm
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States
| | - Luke D Lavis
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States
| | - Robert Tjian
- Department of Molecular and Cell Biology, Li Ka Shing Center for Biomedical and Health Sciences, CIRM Center of Excellence, University of California, Berkeley, Berkeley, United States.,Howard Hughes Medical Institute, Berkeley, United States
| | - Xavier Darzacq
- Department of Molecular and Cell Biology, Li Ka Shing Center for Biomedical and Health Sciences, CIRM Center of Excellence, University of California, Berkeley, Berkeley, United States
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263
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Struntz P, Weiss M. The hitchhiker's guide to quantitative diffusion measurements. Phys Chem Chem Phys 2018; 20:28910-28919. [DOI: 10.1039/c8cp06158k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Quantitative comparison of three widely used techniques for diffusion measurements, implemented on a light sheet microscope.
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Affiliation(s)
- Philipp Struntz
- Experimental Physics I
- University of Bayreuth
- D-95447 Bayreuth
- Germany
| | - Matthias Weiss
- Experimental Physics I
- University of Bayreuth
- D-95447 Bayreuth
- Germany
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264
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Wang D, Wu H, Schwartz DK. Three-Dimensional Tracking of Interfacial Hopping Diffusion. PHYSICAL REVIEW LETTERS 2017; 119:268001. [PMID: 29328686 DOI: 10.1103/physrevlett.119.268001] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Indexed: 05/04/2023]
Abstract
Theoretical predictions have suggested that molecular motion at interfaces-which influences processes including heterogeneous catalysis, (bio)chemical sensing, lubrication and adhesion, and nanomaterial self-assembly-may be dominated by hypothetical "hops" through the adjacent liquid phase, where a diffusing molecule readsorbs after a given hop according to a probabilistic "sticking coefficient." Here, we use three-dimensional (3D) single-molecule tracking to explicitly visualize this process for human serum albumin at solid-liquid interfaces that exert varying electrostatic interactions on the biomacromolecule. Following desorption from the interface, a molecule experiences multiple unproductive surface encounters before readsorption. An average of approximately seven surface collisions is required for the repulsive surfaces, decreasing to approximately two and a half for surfaces that are more attractive. The hops themselves are also influenced by long-range interactions, with increased electrostatic repulsion causing hops of longer duration and distance. These findings explicitly demonstrate that interfacial diffusion is dominated by biased 3D Brownian motion involving bulk-surface coupling and that it can be controlled by influencing short- and long-range adsorbate-surface interactions.
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Affiliation(s)
- Dapeng Wang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, USA
| | - Haichao Wu
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, USA
| | - Daniel K Schwartz
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, USA
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265
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Yu Y, Sundaresan V, Bandyopadhyay S, Zhang Y, Edwards MA, McKelvey K, White HS, Willets KA. Three-Dimensional Super-resolution Imaging of Single Nanoparticles Delivered by Pipettes. ACS NANO 2017; 11:10529-10538. [PMID: 28968077 DOI: 10.1021/acsnano.7b05902] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Controlled three-dimensional positioning of nanoparticles is achieved by delivering single fluorescent nanoparticles from a nanopipette and capturing them at well-defined regions of an electrified substrate. To control the position of single nanoparticles, the force of the pressure-driven flow from the pipette is balanced by the attractive electrostatic force at the substrate, providing a strategy by which nanoparticle trajectories can be manipulated in real time. To visualize nanoparticle motion, a resistive-pulse electrochemical setup is coupled with an optical microscope, and nanoparticle trajectories are tracked in three dimensions using super-resolution fluorescence imaging to obtain positional information with precision in the tens of nanometers. As the particles approach the substrate, the diffusion kinetics are analyzed and reveal either subdiffusive (hindered) or superdiffusive (directed) motion depending on the electric field at the substrate and the pressure-driven flow from the pipette. By balancing the effects of the forces exerted on the particle by the pressure and electric fields, controlled, real-time manipulation of single nanoparticle trajectories is achieved. The developed approach has implications for a variety of applications such as surface patterning and drug delivery using colloidal nanoparticles.
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Affiliation(s)
- Yun Yu
- Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States
| | - Vignesh Sundaresan
- Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States
| | | | - Yulun Zhang
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - Martin A Edwards
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - Kim McKelvey
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - Henry S White
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - Katherine A Willets
- Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States
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