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Journal articles on the topic 'Dual lifetime referencing'

Author: Grafiati
Published: 22 February 2025
Last updated: 31 July 2025

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1

Huber, Christian, Ingo Klimant, Christian Krause, and Otto S. Wolfbeis. "Dual Lifetime Referencing as Applied to a Chloride Optical Sensor." Analytical Chemistry 73, no. 9 (2001): 2097–103. http://dx.doi.org/10.1021/ac9914364.

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2

Chen, Wan-Har, Evelyn Armstrong, Peter W. Dillingham, Stephen C. Moratti, Courtney Ennis, and Christina M. McGraw. "Dual-Lifetime Referencing (t-DLR) Optical Fiber Fluorescent pH Sensor for Microenvironments." Sensors 23, no. 21 (2023): 8865. http://dx.doi.org/10.3390/s23218865.

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The pH behavior in the μm to cm thick diffusion boundary layer (DBL) surrounding many aquatic species is dependent on light-controlled metabolic activities. This DBL microenvironment exhibits different pH behavior to bulk seawater, which can reduce the exposure of calcifying species to ocean acidification conditions. A low-cost time-domain dual-lifetime referencing (t-DLR) interrogation system and an optical fiber fluorescent pH sensor were developed for pH measurements in the DBL interface. The pH sensor utilized dual-layer sol-gel coatings of pH-sensitive iminocoumarin and pH-insensitive Ru(
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3

Liebsch, Gregor, Ingo Klimant, Christian Krause, and Otto S. Wolfbeis. "Fluorescent Imaging of pH with Optical Sensors Using Time Domain Dual Lifetime Referencing." Analytical Chemistry 73, no. 17 (2001): 4354–63. http://dx.doi.org/10.1021/ac0100852.

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4

Borisov, Sergey M., Gerhard Neurauter, Claudia Schroeder, Ingo Klimant, and Otto S. Wolfbeis. "Modified Dual Lifetime Referencing Method for Simultaneous Optical Determination and Sensing of Two Analytes." Applied Spectroscopy 60, no. 10 (2006): 1167–73. http://dx.doi.org/10.1366/000370206778664590.

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5

Begemann, Jens, and Antje C. Spiess. "Dual lifetime referencing enables pH-control for oxidoreductions in hydrogel-stabilized biphasic reaction systems." Biotechnology Journal 10, no. 11 (2015): 1822–29. http://dx.doi.org/10.1002/biot.201500198.

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6

Maierhofer, Maximilian, Sergey M. Borisov, and Torsten Mayr. "Optical Ammonia Sensor for Continuous Bioprocess Monitoring." Proceedings 2, no. 13 (2018): 1041. http://dx.doi.org/10.3390/proceedings2131041.

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We present an optical ammonia sensor suitable for bioprocess monitoring. A fluorescent dye is physically entrapped in a polyurethane hydrogel forming an emulsion system with vinylterminated polydimethylsiloxane (PDMS). The sensing layer is covered by a hydrophobic porous membrane which excludes hydrophilic substances. Ammonia, diffuses through this barrier and PDMS to the protonated dye, whereby it deprotonates the dye and switches off its emission. Readout is performed with a miniaturized phase fluorimeter combined with optical fibers. Dual-lifetime referencing (DLR) acts as detection method
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7

Lin, Xuyan, Wenting Qiu, Gianmarco Domenico Suarez, and Stefan Nagl. "Extracellular pH Monitoring of Live Single Cells in Microdroplets Using Dual-Labelled Fluorinated Silica Nanoparticles and Time-Domain Dual Lifetime Referencing." Chemosensors 10, no. 10 (2022): 379. http://dx.doi.org/10.3390/chemosensors10100379.

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Fluorinated silica nanoparticles doped with Ruthenium-tris-1,10-phenanthroline dichloride on the inside and covalently conjugated with perfluorooctyltriethoxysilane and fluorescein isothiocyanate on the outside were developed and served several functions; the fluorination of the particles served to stabilize droplets in a microfluidic system at their interface to the continuous phase for single-cell experiments, and the two dyes provided for intrinsically referenced pH readout according to the time-domain dual lifetime referencing scheme. Apart from eliminating the droplet-to-droplet transport
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8

Rowe, H. M., Sing Po Chan, J. N. Demas, and B. A. DeGraff. "Self-Referencing Intensity Measurements Based on Square-Wave Gated Phase-Modulation Fluorimetry." Applied Spectroscopy 57, no. 5 (2003): 532–37. http://dx.doi.org/10.1366/000370203321666551.

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An adaptation of square-wave gated phase-modulation (GPM) fluorimetry allows for self-referenced intensity measurements without the complexity of dual excitation or dual emission wavelengths. This AC technique utilizes square-wave excitation, gated detection, a reference emitter, and a sensor molecule. The theory and experimental data demonstrating the effectiveness and advantages of the adapted GPM scheme are presented. One component must have an extremely short lifetime relative to the other. Both components are affected identically by changes in intensity of the excitation source, but the s
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9

Boniello, Caterina, Torsten Mayr, Juan M. Bolivar, and Bernd Nidetzky. "Dual-lifetime referencing (DLR): a powerful method for on-line measurement of internal pH in carrier-bound immobilized biocatalysts." BMC Biotechnology 12, no. 1 (2012): 11. http://dx.doi.org/10.1186/1472-6750-12-11.

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10

Poehler, Elisabeth, Christin Herzog, Madeleine Suendermann, Simon A. Pfeiffer, and Stefan Nagl. "Development of microscopic time-domain dual lifetime referencing luminescence detection for pH monitoring in microfluidic free-flow isoelectric focusing." Engineering in Life Sciences 15, no. 3 (2015): 276–85. http://dx.doi.org/10.1002/elsc.201400081.

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11

Maierhofer, Maximilian, Veronika Rieger, and Torsten Mayr. "Optical ammonia sensors based on fluorescent aza-BODIPY dyes— a flexible toolbox." Analytical and Bioanalytical Chemistry 412, no. 27 (2020): 7559–67. http://dx.doi.org/10.1007/s00216-020-02891-3.

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Abstract We present three types of optical ammonia sensors suitable for environmental, bioprocess, and reaction monitoring. A respective fluorescent BF2-chelated tetraarylazadipyrromethene dye (aza-BODIPYs) is physically entrapped in a polyurethane hydrogel (HydroMed D4) forming an emulsion system with vinyl-terminated polydimethylsiloxane (PDMS). The analyte-sensitive layer is covered by a hydrophobic membrane which excludes hydrophilic substances. Three different protection layers are tested, whereby the Teflon and the hydrophobic PES layers outperform a PDMS/TiO2 layer. Response times withi
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12

Ding, Longjiang, Ying Lian, Zhenzhen Lin, Zeyu Zhang, and Xu-dong Wang. "Long-Term Quantitatively Imaging Intracellular Chloride Concentration Using a Core-/Shell-Structured Nanosensor and Time-Domain Dual-Lifetime Referencing Method." ACS Sensors 5, no. 12 (2020): 3971–78. http://dx.doi.org/10.1021/acssensors.0c01671.

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13

Grengg, Cyrill, Bernhard Mueller, Florian Mittermayr, Torsten Mayr, Sergey Borisov, and Martin Dietzel. "Optical pH imaging of concrete exposed to chemically corrosive environments." MATEC Web of Conferences 199 (2018): 02007. http://dx.doi.org/10.1051/matecconf/201819902007.

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Major types of chemical concrete degradation such as carbonation, leaching and acid attacks are strongly associated with decreasing internal or external pH. Thus a precise determination of the latter is crucial for the assessment regarding the degree of corrosion and corresponding development of prevention strategies. Conventional pH measure methods for concrete, such as phenolphthalein indicator, pore solution extractions and flat surface electrodes have proven to contain significant limitations and inadequacies. This contribution presents the application of sensor foils based on luminescent
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14

Tufan, Tuna B., and Ulkuhan Guler. "A Transcutaneous Carbon Dioxide Monitor Based on Time-Domain Dual Lifetime Referencing." IEEE Transactions on Biomedical Circuits and Systems, 2023, 1–12. http://dx.doi.org/10.1109/tbcas.2023.3277398.

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15

Clarke, Jennifer S., Matthew P. Humphreys, Eithne Tynan, et al. "Characterization of a Time-Domain Dual Lifetime Referencing pCO2 Optode and Deployment as a High-Resolution Underway Sensor across the High Latitude North Atlantic Ocean." Frontiers in Marine Science 4 (December 15, 2017). http://dx.doi.org/10.3389/fmars.2017.00396.

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