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Beddard GS, Yorke BA. Pump-Probe Spectroscopy Using the Hadamard Transform. APPLIED SPECTROSCOPY 2016; 70:1292-1299. [PMID: 27340218 DOI: 10.1177/0003702816653927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 10/20/2015] [Indexed: 06/06/2023]
Abstract
A new method of performing pump-probe experiments is proposed and experimentally demonstrated by a proof of concept on the millisecond scale. The idea behind this method is to measure the total probe intensity arising from several time points as a group, instead of measuring each time separately. These measurements are multiplexes that are then transformed into the true signal via multiplication with a binary Hadamard S matrix. Each group of probe pulses is determined by using the pattern of a row of the Hadamard S matrix and the experiment is completed by rotating this pattern by one step for each sample excitation until the original pattern is again produced. Thus to measure n time points, n excitation events are needed and n probe patterns each taken from the n × n S matrix. The time resolution is determined by the shortest time between the probe pulses. In principle, this method could be used over all timescales, instead of the conventional pump-probe method which uses delay lines for picosecond and faster time resolution, or fast detectors and oscilloscopes on longer timescales. This new method is particularly suitable for situations where the probe intensity is weak and/or the detector is noisy. When the detector is noisy, there is in principle a signal to noise advantage over conventional pump-probe methods.
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Lewandowska-Łańcucka J, Fiejdasz S, Rodzik Ł, Łatkiewicz A, Nowakowska M. Novel hybrid materials for preparation of bone tissue engineering scaffolds. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:231. [PMID: 26347455 DOI: 10.1007/s10856-015-5564-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 08/29/2015] [Indexed: 06/05/2023]
Abstract
The organic-inorganic hybrid systems based on biopolymer hydrogels with dispersed silica nanoparticles were obtained and characterized in terms of their physicochemical properties, cytocompatibility and bioactivity. The hybrid materials were prepared in a form of collagen and collagen-chitosan sols to which the silica nanoparticles of two different sizes were incorporated. The ability of these materials to undergo in situ gelation under physiological temperature was assessed by microviscosity and gelation time determination based on steady-state fluorescence anisotropy measurements. The effect of silica nanoparticles addition on the physicochemical properties (surface wettability, swellability) of hybrid materials was analyzed and compared with those characteristic for pristine collagen and collagen-chitosan hydrogels. Biological studies indicate that surface wettability determined in terms of contact angle for all of the hybrids prepared is optimal and thus can provide satisfactory adhesion of fibroblasts. Cytotoxicity test results showed high metabolic activity of mouse as well as human fibroblast cell lines cultured on hybrid materials. The composition of hybrids was optimized in terms of concentration of silica nanoparticles. The effect of silica on the formation of bone-like mineral structures on exposition to simulated body fluid was determined. SEM images revealed mineral phase formation not only at the surfaces but also in the whole volumes of all hybrid materials developed suggesting their usefulness for bone tissue engineering. EDS and FTIR analyses indicated that these mineral phases consist of apatite-like structures.
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Fiejdasz S, Szczubiałka K, Lewandowska-Łańcucka J, Osyczka AM, Nowakowska M. Biopolymer-based hydrogels as injectable materials for tissue repair scaffolds. Biomed Mater 2013; 8:035013. [DOI: 10.1088/1748-6041/8/3/035013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Fluorescence anisotropy measurements in solution: Methods and reference materials (IUPAC Technical Report). PURE APPL CHEM 2013. [DOI: 10.1351/pac-rep-11-11-12] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
After recalling the basic relations relevant to both steady-state and
time-resolved fluorescence polarization, it is shown how the values of
steady-state polarized intensities recorded experimentally usually need to be
corrected for systematic effects and errors, caused by instrumentation and
sample properties. A list of selected reference values of steady-state
fluorescence anisotropy and polarization is given. Attention is also paid to
analysis of time-resolved fluorescence anisotropy data obtained by pulse
fluorometry or phase and modulation fluorometry techniques. Recommendations for
checking the accuracy of measurements are provided together with a list of
selected time-resolved fluorescence anisotropy data as reported in the
literature.
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Adamson BD, Coughlan NJA, Continetti RE, Bieske EJ. Changing the shape of molecular ions: photoisomerization action spectroscopy in the gas phase. Phys Chem Chem Phys 2013; 15:9540-8. [DOI: 10.1039/c3cp51393a] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Nonlinear absorption and excited state dynamics in Rhodamine B studied using Z-scan and degenerate four wave mixing techniques. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00928-4] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Mialocq JC, Gustavsson T. Investigation of Femtosecond Chemical Reactivity by Means of Fluorescence Up-Conversion. ACTA ACUST UNITED AC 2001. [DOI: 10.1007/978-3-642-56853-4_4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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Bain AJ, Chandna P, Bryant J. Picosecond polarized fluorescence studies of anisotropic fluid media. I. Theory. J Chem Phys 2000. [DOI: 10.1063/1.481678] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Dutt GB, Srivatsavoy VJP, Sapre AV. Rotational dynamics of pyrrolopyrrole derivatives in alcohols: Does solute–solvent hydrogen bonding really hinder molecular rotation? J Chem Phys 1999. [DOI: 10.1063/1.478928] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Dutt GB, Singh MK, Sapre AV. Rotational dynamics of neutral red: Do ionic and neutral solutes experience the same friction? J Chem Phys 1998. [DOI: 10.1063/1.477225] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Maiti NC, Krishna MMG, Britto PJ, Periasamy N. Fluorescence Dynamics of Dye Probes in Micelles. J Phys Chem B 1997. [DOI: 10.1021/jp9723123] [Citation(s) in RCA: 263] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nakul C. Maiti
- Chemical Physics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India
| | - M. M. G. Krishna
- Chemical Physics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India
| | - P. J. Britto
- Chemical Physics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India
| | - N. Periasamy
- Chemical Physics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400 005, India
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Martini I, Hartland GV. Ultrafast Investigation of Vibrational Relaxation in the S1 Electronic State of HITC. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9623352] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ignacio Martini
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556
| | - Gregory V. Hartland
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556
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Martini I, Hartland GV. Relaxation dynamics in the first excited singlet state of a cyanine dye: HITC. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00643-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Jonas DM, Lang MJ, Nagasawa Y, Joo T, Fleming GR. Pump−Probe Polarization Anisotropy Study of Femtosecond Energy Transfer within the Photosynthetic Reaction Center of Rhodobacter sphaeroides R26. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp960708t] [Citation(s) in RCA: 180] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David M. Jonas
- Department of Chemistry and the James Franck Institute, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Matthew J. Lang
- Department of Chemistry and the James Franck Institute, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Yutaka Nagasawa
- Department of Chemistry and the James Franck Institute, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Taiha Joo
- Department of Chemistry and the James Franck Institute, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Graham R. Fleming
- Department of Chemistry and the James Franck Institute, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
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Joo T, Jia Y, Yu J, Lang MJ, Fleming GR. Third‐order nonlinear time domain probes of solvation dynamics. J Chem Phys 1996. [DOI: 10.1063/1.471276] [Citation(s) in RCA: 425] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Kawski A. Fluorescence Anisotropy: Theory and Applications of Rotational Depolarization. Crit Rev Anal Chem 1993. [DOI: 10.1080/10408349308051654] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Dutt GB, Doraiswamy S, Periasamy N, Venkataraman B. Rotational reorientation dynamics of polar dye molecular probes by picosecond laser spectroscopic technique. J Chem Phys 1990. [DOI: 10.1063/1.459288] [Citation(s) in RCA: 136] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Myslinski P, Wieczorek D. Differential anisotropy of polarizability measured by picosecond transient dichroism and birefringence. J Chem Phys 1990. [DOI: 10.1063/1.458079] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Myslinski P, Wieczorek D, Kownacki K. Picosecond fluorescence anisotropy measured by frequency conversion. Chem Phys Lett 1989. [DOI: 10.1016/0009-2614(89)85320-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Periasamy N, Doraiswamy S, Venkataraman B, Fleming GR. Diffusion controlled reactions: Experimental verification of the time‐dependent rate equation. J Chem Phys 1988. [DOI: 10.1063/1.455673] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Periasamy N, Doraiswamy S, Maiya GB, Venkataraman B. Diffusion controlled reactions: Fluorescence quenching of cationic dyes by charged quenchers. J Chem Phys 1988. [DOI: 10.1063/1.454143] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ben‐Amotz D, Harris CB. Torsional dynamics of molecules on barrierless potentials in liquids. I. Temperature and wavelength dependent picosecond studies of triphenyl‐methane dyes. J Chem Phys 1987. [DOI: 10.1063/1.452656] [Citation(s) in RCA: 133] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Penzkofer A, Sperber P. Measurement of absorption cross sections in the long-wavelength region of the S0S1 absorption band of dyes. Chem Phys 1984. [DOI: 10.1016/0301-0104(84)85288-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Baran J, Langley AJ, Jeremy Jones W. Coherent amplification in fluorescent dye solutions. I. The fluorescence gain spectrum of cresyl violet. Chem Phys 1984. [DOI: 10.1016/0301-0104(84)85055-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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van Hoek A, Vervoort J, Visser AJ. A subnanosecond resolving spectrofluorimeter for the analysis of protein fluorescence kinetics. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 1983; 7:243-54. [PMID: 6875183 DOI: 10.1016/0165-022x(83)90033-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A spectrofluorometer is described consisting of an excitation source, optics, detector and time resolving electronics. The excitation source consists of a mode-locked Ar ion laser, which synchronously pumps a dye laser, followed by a frequency doubling device. The repetition frequency of the U.V. pulses (FWHM some ps) has been reduced by an extra-cavity electro-optical modulator. Provisions have been made in the optical configuration to determine both time-resolved fluorescence spectra and fluorescence anisotropy decay curves. The commercially available electronics have been optimized for maximum time resolution. The spectral output of the excitation source is confined between 280 and 310 nm, which encompasses the region for eliciting protein fluorescence. The performance of the complete system has been tested with single lifetime standards like p-terphenyl in cyclohexane or with N-acetyl-L-tryptophanamide in pH 7.5 buffer. Serum albumins from human and bovine sources have been employed as examples for time resolved fluorescence spectra and for the demonstration of anisotropy decay curves. Using these methods protein dynamics in the (sub)nanosecond time region can be directly explored.
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