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Journal articles on the topic 'Fluorescence optique'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Saissy, André, Zhi Pilg Cai, and D. B. Ostrowsky. "Fluorescence d’une fibre optique en silice dopée au néodyme." Annales Des Télécommunications 44, no. 3-4 (1989): 167–72. http://dx.doi.org/10.1007/bf02997811.

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2

Jouchet, Pierre, Abigail Illand, Guillaume Dupuis, Emmanuel Fort, and Sandrine Lévêque-Fort. "Dépasser la limite de diffraction en microscopie de fluorescence." Photoniques, no. 108 (May 2021): 44–48. http://dx.doi.org/10.1051/photon/202110845.

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La microscopie de fluorescence est un outil de référence dans l’étude des systèmes biologiques, alliant la spécificité offerte par la fluorescence et la possibilité d’un suivi non invasif en milieu vivant. Cependant comme l’ensemble des techniques de microscopie, elle est soumise au phénomène de diffraction introduit par l’objectif, qui limite la résolution de l’instrument. Ce texte présente les différentes méthodes permettant de dépasser cette contrainte en associant développement instrumental en optique et contrôle de la photophysique des fluorophores afin de révéler l’organisation cellulair

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3

Saissy, A., and Z. P. Cai. "Fluorescence et absorption dans une fibre optique en PMMA dopé au crésyl violet." Revue de Physique Appliquée 23, no. 5 (1988): 941–46. http://dx.doi.org/10.1051/rphysap:01988002305094100.

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4

Montcel, B., R. Chabrier, and P. Poulet. "Tomographie optique des photons diffusés et de fluorescence : un appareil dédié au petit animal." ITBM-RBM 26, no. 4 (2005): 252–54. http://dx.doi.org/10.1016/j.rbmret.2005.06.006.

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5

Bellard, E., M. C. Blache, R. Castanier, et al. "R101: Développement des applications thérapeutiques de l’électroperméabilisation en cancérologie : apport de l’imagerie optique de fluorescence." Bulletin du Cancer 97, no. 4 (2010): S55. http://dx.doi.org/10.1016/s0007-4551(15)31020-1.

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6

ANDUEZA, D., B. P. MOUROT, A. AÏT-KADDOUR, S. PRACHE, and J. MOUROT. "Utilisation de la spectroscopie dans le proche infrarouge et de la spectroscopie de fluorescence pour estimer la la qualité et la traçabilité de la viande." INRA Productions Animales 28, no. 2 (2020): 197–208. http://dx.doi.org/10.20870/productions-animales.2015.28.2.3025.

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Ces dernières années, la spectroscopie dans le proche infrarouge et la spectroscopie de fluorescence ont fait preuve d’une efficacité remarquable pour l’obtention d’estimations rapides et précises des paramètres de qualité des produits agricoles. Cette synthèse fait le point de l’état des connaissances sur l’application de ces technologies pour l’estimation de la qualité de la viande et des produits carnés. Un bref rappel des fondements théoriques des techniques est d’abord exposé. Les possibilités actuelles de leur application analytique aux différents paramètres de la qualité de la viande so

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7

Zhou, Tongchang, Arnab Halder, and Yi Sun. "Fluorescent Nanosensor Based on Molecularly Imprinted Polymers Coated on Graphene Quantum Dots for Fast Detection of Antibiotics." Biosensors 8, no. 3 (2018): 82. http://dx.doi.org/10.3390/bios8030082.

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In this work, we developed a novel fluorescent sensor by combining molecularly imprinted polymers (MIPs) with graphene quantum dots (GQDs) for the determination of tetracycline (TC) in aqueous samples. Firstly, we developed a one-pot green method to synthesize GQDs as the fluorescent probes. GQDs with carboxyl groups or amino groups were fabricated. It was found that carboxyl groups played an important role in the fluorescence quenching. Based on these findings, the GQDs-MIPs microspheres were prepared using a sol-gel process. GQDs-MIPs showed strong fluorescent emission at 410 nm when excited

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8

Tian, Min, Yingte Wang, and Yong Zhang. "Synthesis of Fluorescent Nitrogen-Doped Carbon Quantum Dots for Selective Detection of Picric Acid in Water Samples." Journal of Nanoscience and Nanotechnology 18, no. 12 (2018): 8111–17. http://dx.doi.org/10.1166/jnn.2018.16342.

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In this work, fluorescent nitrogen-doped carbon dots (N-CDs) were pyrolysis synthesized using edetic acid and acrylamide as precursors without further surface modication. The as-prepared N-CDs were mono-dispersed spherical nanoparticles with an average diameter of 3.25 nm. The blue fluorescence emission was dependent of the excitation wavelengths, releasing stable and strong blue fluorescence under the maximum excitation wavelength. More strikingly, after adding picric acid (PA), the fluorescence of N-CDs aqueous solution gave rise to the obviously fluorescence quenching due to the inner filte

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9

Wang, Xiao, Jiang Xu, Mu Hua Liu, Jin Hui Zhao, and Qian Hong. "Determination of Gentamicin Residual in Duck Meat Using Fluorescence Analysis Method." Advanced Materials Research 1033-1034 (October 2014): 638–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.638.

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Gentamicin is a kind of aminoglycoside antibiotics and widely used in the prevention and treatment of the duck diseases. A prediction model was established for the rapid detection of Gentamicin residue in duck meat using fluorescence analysis method according to the strong fluorescent characteristic of the generated derivative for Gentamicin and o-phthaldialdehyde (OPA) in the presence of emulsifier OP-10 and mercaptoethanol.The fluorescence spectra of the duck meat containing Gentamicin were analyzed, the optimum excitation wavelength of the material was 340 nm and the optimum emission wavele

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10

Shrive, Jason D. A., John D. Brennan, R. Stephen Brown, and Ulrich J. Krull. "Optimization of the Self-Quenching Response of Nitrobenzoxadiazole Dipalmitoylphosphatidylethanolamine in Phospholipid Membranes for Biosensor Development." Applied Spectroscopy 49, no. 3 (1995): 304–13. http://dx.doi.org/10.1366/0003702953963526.

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Incorporation of the lipid-conjugated fluorescent probe nitrobenzoxadiazole dipalmitoylphosphatidylethanolamine (NBD-PE) into bilayer lipid membranes (BLMs) provides a matrix wherein changes in the structure of the membrane can be transduced into changes in fluorescence intensity or lifetime. In the work reported here, a comparison was made between an empirical model recently developed by our group to account for alterations in the fluorescence lifetime and average fluorescence intensity of NBD-PE as a result of self-quenching and an earlier alternative model which describes self-quenching of

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11

Bian, Wei Wei. "Spectrofluorimetric Determination of Bilirubin Using Enoxacine-Terbium Probe." Applied Mechanics and Materials 556-562 (May 2014): 421–24. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.421.

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A new spectrofluorimetric method was developed for determination of trace amount of bilirubin. Using enoxacine–terbium ion as a fluorescent probe, in the buffer solution of pH=5.8, BR can remarkably reduce the fluorescence intensity of the ENX-Tb3+ complex at λ=545nm and the reduced fluorescence intensity of Tb3+ ion is in proportion to the concentration of BR. Optimum conditions for the determination of BR were also investigated. The linear range and detection limit for the determination of BR are 1.0×10-7～4.5×10-6mol/L and 8.1×10-8mol/L. This method is simple, practical and can be successful

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12

Zhao, Lingzhi, Liu Zhao, Yanqing Miao, Chunye Liu, and Chenxiao Zhang. "Construction of a Turn Off-On-Off Fluorescent System Based on Competitive Coordination of Cu2+between 6,7-Dihydroxycoumarin and Pyrophosphate Ion for Sensitive Assay of Pyrophosphatase Activity." Journal of Analytical Methods in Chemistry 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/4306838.

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The detection of pyrophosphatase (PPase) activity is of great significance in diagnosing diseases and understanding the function of PPase-related biological events. This study constructed a turn off-on-off fluorescent system for PPase activity assay based on PPase-regulated competitive coordination of Cu2+between a water-soluble fluorescent probe 6,7-dihydroxycoumarin (DHC) and pyrophosphate (PPi). The probe DHC can coordinate with Cu2+and consequently display on-off type fluorescence response. Furthermore, the in situ formed nonfluorescent Cu2+-DHC complex can act as an effective off-on type

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13

Zhuo, Shi Yi, Xi Liu, Pao Gao, Wei Huang, Cheng Feng Yan, and Er Wei Shi. "Fluorescent P-Type 4H-SiC Grown by PVT Method." Materials Science Forum 858 (May 2016): 326–30. http://dx.doi.org/10.4028/www.scientific.net/msf.858.326.

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Fluorescent SiC, which contains donor and acceptor impurities with optimum concentrations, can work as a phosphor for visible light emission by donor-acceptor-pair (DAP) recombination. In this work, 3 inch N-B-Al co-doped fluorescent 4H-SiC crystals are prepared by PVT method. The p-type fluorescent 4H-SiC with low aluminum doping concentration can show intensive yellow-green fluorescence at room temperature. N-B DAP peak wavelength shifts from 578nm to 525nm and weak N-Al DAP emission occurred 403/420 nm quenches, when the temperature increases from 4K to 298K. The aluminum doping induces hig

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14

Zheng, Chengzhi, Huiping Wang, Lingzhi Liu, Manjun Zhang, Jiangong Liang, and Heyou Han. "Synthesis and Spectroscopic Characterization of Water-Soluble Fluorescent Ag Nanoclusters." Journal of Analytical Methods in Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/261648.

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Water-soluble fluorescent Ag nanoclusters (NCs) were synthesized at room temperature with sodium dodecyl sulfonate (SDS) as a protective agent. The effects of synthetic conditions on the fluorescence properties of Ag NCs were investigated. The results show that the fluorescence intensity of Ag NCs strongly depends on the synthetic conditions, such as the molar ratio of AgNO3 versus SDS and sodium borohydride (NaBH4), the reaction time, and the pH value of the reaction solution. Under the optimum conditions, the as-prepared Ag NCs exist in face-centered-cubic phase with an average size of 2 nm.

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15

Yang, Yue Qian, Shi Chao Xu, Heng Miao, et al. "Development of a Novel and Bi-Functional Quantum Dots as FRET Energy Donor." Advanced Materials Research 152-153 (October 2010): 1418–21. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.1418.

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A novel CdTe/Ni QDs which combined both magnetism and fluorescence was successfully synthesized and its optical properties were investigated. Ni magnetic nanoparticles (MNPs) were synthesized and used as magnetic core, CdTe quantum dots (QDs) were applied as fluorescent shell material, the qualified magnetic CdTe/Ni quantum dots (mQDs) were achieved via layer-by-layer process using 1,6-hexylenediamime as linker, surface charge types of MNPs and mQDs were confirmed with a delsa nano beckman coulter. Morphology of the prepared Ni MNPs and CdTe/Ni mQDs was characterized by transmission electron m

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16

Jenie, Aisyiyah S. N., Fransiska S. H. Krismastuti, Yudia P. Ningrum, et al. "Geothermal silica-based fluorescent nanoparticles for the visualization of latent fingerprints." Materials Express 10, no. 2 (2020): 258–66. http://dx.doi.org/10.1166/mex.2020.1551.

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The development of silica nanoparticles from the waste of geothermal power plants and their subsequent modification using a fluorescent dye, rhodamine 6G (R-6G), has been reported. The optimum specific surface area of the silica nanoparticles before modification was 289.2 m2 g–1. After modification, the intrinsic properties of the fluorescent silica nanoparticles were studied, and the results showed that they were in their amorphous phase, with a particle size of 5–10 nm. We proposed that the interaction between R-6G and the silica nanoparticle surface was due to the hydrogen bonding, using th

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17

Gou, Xiying, Panyue Zhang, Yonghui Song, Feng Qian, Huibing Yu, and Guangming Zeng. "Novel insights into the coagulation process for pharmaceutical wastewater treatment with fluorescence EEMs-PARAFAC." Water Science and Technology 76, no. 12 (2017): 3246–57. http://dx.doi.org/10.2166/wst.2017.425.

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Abstract In this study, coagulation process was applied to treat the effluent of pharmaceutical wastewater using polymeric ferric sulfate as a coagulant. Three-dimensional excitation-emission matrix fluorescence spectroscopy coupled with parallel factor analysis (EEMs-PARAFAC) was applied to investigate the fluorescent characteristics of dissolved organic matter (DOM) from pharmaceutical wastewater and the reduction of contaminant and fluorescent variations in the coagulation process. It shows that coagulation was effective to remove contaminants in the effluent of pharmaceutical wastewater, a

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18

Rahman, Zulaiha A., Siti Fatimah Ibrahim, Nurul Atikah Osman, Farah Hanan Fathihah Jaafar, and Khairul Osman. "Effect of Energy Substrate Dynamics on Mitochondrial Activity and Oxidative Stress Levels of in vitro Maturing Bovine Oocytes." Journal of Agricultural Science 9, no. 13 (2017): 14. http://dx.doi.org/10.5539/jas.v9n13p14.

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This study was conducted to explore the effect of energy substrates in the culture medium during in vitro maturation of bovine oocytes. A modified TCM199 medium (M-7528) was used to mature bovine oocytes in vitro. Oocytes were supplemented with different pyruvate (0.1, 0.2, 0.4 mM) and glucose (1.5, 5.6, 20.0 mM) concentrations for 48 hours at 38.5 °C under 5% CO2 atmosphere with 95% humidity. Their maturity was checked at 24 and 48 hours. After 48 hours, the denuded oocytes were stained with fluorescent dye JC-1 and avidin-FITC. Fluorescent dye JC-1 is a membrane permeable to the cell and wou

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19

Zhang, Feifei, Qi Gao, Junxia Zhao, Man Ge, and Yinjuan Bai. "Design and synthesis of a novel rhodamine-based chemosensor and recognition study to Fe3+." Heterocyclic Communications 22, no. 1 (2016): 37–42. http://dx.doi.org/10.1515/hc-2015-0139.

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AbstractA fluorescent and colorimetric chemosensor Rh1 for Fe3+ was synthesized by condensation reaction of rhodamine B hydrochloride and 2-aminothiazole, and its structure was confirmed by NMR, IR, HRMS and crystal data. Upon coordination with Fe3+ in CH3CN-H2O (1:1, v/v) solution, the spirolactam of Rh1 is opened, which results in a dramatic enhancement of fluorescence intensity as well as the color change of the solution. Most importantly, other metal ions show no obvious interference with the detection of Fe3+. Under the optimum conditions described, the fluorescence intensity is linearly

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20

Dong, Haowei, Xingshuang An, Yaodong Xiang, et al. "Novel Time-Resolved Fluorescence Immunochromatography Paper-Based Sensor with Signal Amplification Strategy for Detection of Deoxynivalenol." Sensors 20, no. 22 (2020): 6577. http://dx.doi.org/10.3390/s20226577.

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Immunoassay has the advantages of high sensitivity, high specificity, and simple operation, and has been widely used in the detection of mycotoxins. For several years, time-resolved fluorescence immunochromatography (TRFIA) paper-based sensors have attracted much attention as a simple and low-cost field detection technology. However, a traditional TRFIA paper-based sensor is based on antibody labeling, which cannot easily meet the current detection requirements. A second antibody labeling method was used to amplify the fluorescence signal and improve the detection sensitivity. Polystyrene fluo

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21

Ramírez-Herrera, Doris E., Ana Patricia Reyes-Cruzaley, Giselle Dominguez, Francisco Paraguay-Delgado, Antonio Tirado-Guízar, and Georgina Pina-Luis. "CdTe Quantum Dots Modified with Cysteamine: A New Efficient Nanosensor for the Determination of Folic Acid." Sensors 19, no. 20 (2019): 4548. http://dx.doi.org/10.3390/s19204548.

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In this paper, we report the synthesis, characterization, and application of a new fluorescent nanosensor based on water-soluble CdTe quantum dots (QDs) coated with cysteamine (CA) for the determination of folic acid (FA). CdTe/CA QDs were characterized by high-resolution transmission electron microscopy, the zeta potential, and Fourier-transform infrared (FT-IR), UV-visible, and fluorescence spectroscopy. CdTe QDs coated with mercaptopropionic acid (MPA) and glutathione (GSH) were prepared for comparison purposes. The effect of FA on the photoluminescence intensity of the three thiol-capped Q

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22

Sims, Art, and Dirk Shoemaker. "Simultaneous Liquid Chromatographic Determination of Thiamine and Riboflavin in Selected Foods." Journal of AOAC INTERNATIONAL 76, no. 5 (1993): 1156–60. http://dx.doi.org/10.1093/jaoac/76.5.1156.

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Abstract A reliable, improved liquid chromatographic (LC) method has been developed for the measurement of thiamine and riboflavin in foods. The major improvement in the method is the chromatographic separation achieved. The method is also very reproducible and extremely sensitive. After autoclave extraction, samples are derivatized to form thiochrome (a highly fluorescent oxidation product of thiamine). Riboflavin is naturally fluorescent. Interferences are removed on a Ci8 cartridge and chromatographed by using a reversed-phase separation. The mobile phase used is 72% 0.005M NH4OAc (pH 5.0)-

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23

Hardham, A. R. "Studies on the cell surface of zoospores and cysts of the fungus Phytophthora cinnamomi: The influence of fixation on patterns of lectin binding." Journal of Histochemistry & Cytochemistry 33, no. 2 (1985): 110–18. http://dx.doi.org/10.1177/33.2.3918095.

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The study of the surface properties of zoospores and cysts of the fungus Phytophthora cinnamomi required a fixation regime that would preserve the cells adequately and not interfere with binding and detection of probes on the cell surface. When they were fixed in 4% formaldehyde (F), specific binding of concanavalin A-fluorescein isothiocyanate and rhodamine-labeled soybean agglutinin was obtained. However, electron microscopy showed that preservation was so poor that intracellular binding sites had become exposed. By contrast glutaraldehyde (G), even at concentrations as low as 0.05%, gave go

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Xu, Shi Chao, Yue Qian Yang, Yan Shan Liu, et al. "Preparation and Characterization of the Core/Shell Structured of CdTe/Ni Fluorescent-Magnetic Particle." Advanced Materials Research 217-218 (March 2011): 216–19. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.216.

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The niclel nanoparticles were prepared via polyol process with hydrazine hydrate as reductant, the optimum conditions were investigated and proposed to be the molar ratio of NiCl2: NaOH: Hydrazine hydrate =1: 2: 11, 60 °C, pH5.5. The qualified fluorescent-magnetic dual functional CdTe/Ni nanoparticles were synthesized via layer-by-layer (LBL) technique, Ni was designed to be magnetic core and CdTe was used as fluorescent shell material, the molar ratio of CdTe:Ni is 4.5:1. The morphology of the Ni nano particles and CdTe/Ni core shell dual functional nano particles were characterized by transm

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25

Lang, Claus, and Dirk Schüler. "Expression of Green Fluorescent Protein Fused to Magnetosome Proteins in Microaerophilic Magnetotactic Bacteria." Applied and Environmental Microbiology 74, no. 15 (2008): 4944–53. http://dx.doi.org/10.1128/aem.00231-08.

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ABSTRACT The magnetosomes of magnetotactic bacteria are prokaryotic organelles consisting of a magnetite crystal bounded by a phospholipid bilayer that contains a distinct set of proteins with various functions. Because of their unique magnetic and crystalline properties, magnetosome particles are potentially useful as magnetic nanoparticles in a number of applications, which in many cases requires the coupling of functional moieties to the magnetosome membrane. In this work, we studied the use of green fluorescent protein (GFP) as a reporter for the magnetosomal localization and expression of

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26

Wan, Fu Wei, Meng Zhang, Shao Wei Wang, and Jing Hua Yu. "The Synthesis of New Rhodanine Ramification and Application in Determine Trace Bismuth." Advanced Materials Research 306-307 (August 2011): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.147.

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A new type rhodanine ramification 3-(4'-methoxyphenyl)-5 (2'- arsenoxylphenylazo)- rhodanine (4MORAAP) was prepared as fluorescent reagent in this paper. A new pectrofluorimetry method was proposed to determine the trace bismuth based on the reaction between potassium periodate and 4MORAAP. The fluorescence intensity was found to be quenched by the oxidation of 4MORAAP by potassium periodate with bismuth as catalyst in the buffer medium of potassium hydrogen phthalate-sodium hydroxide (pH=5.2). Under the optimum conditions, the fluorescent intensity was correlated to be linear with the concent

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27

Wang, Shou Mei, Shen Gгang Ge, Mei Yan, and Jing Hua Yu. "Synthesis and Character of Fluorescence Reagent 3-P-Nitrylphenyl-5-(2'-Sulfonophenylazo) Rhodanine." Advanced Materials Research 306-307 (August 2011): 327–30. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.327.

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A new type rhodanine ramification 3-(4'-methoxyphenyl)-5 (2'- arsenoxylphenylazo)- rhodanine (4MORAAP) was prepared as fluorescent reagent in this paper. A new pectrofluorimetry method was proposed to determine the trace bismuth based on the reaction between potassium periodate and 4MORAAP. The fluorescence intensity was found to be quenched by the oxidation of 4MORAAP by potassium periodate with bismuth as catalyst in the buffer medium of potassium hydrogen phthalate-sodium hydroxide (pH=5.2). Under the optimum conditions, the fluorescent intensity was correlated to be linear with the concent

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28

Wang, Li Yan, Guang Qing Gai, and Xiang Ting Dong. "Preparation of Eu(BA)₃phen/PVP Fluorescent Nanofibers by Electrospinning." Advanced Materials Research 919-921 (April 2014): 2084–87. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.2084.

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Eu (BA)3phen/PVP fluorescent nanofibers has been successfully fabricated based on PVP and europium complexes Eu (BA)3phen (BA = benzoic acid, phen = phenanthroline) via electrospinning technology. The as-prepared samples were characterized by field-emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and fluorescence spectroscopy (FS). The as-prepared Eu (BA)3phen/PVP nanofibers possess good fibrous morphology, smooth surface and narrow size distribution. The average diameter of nanofibers was about 250 nm. Under the excitation of 274-nm ultraviolet light, Eu (BA

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Li, Yubin, Sheng Liu, and Liansheng Ling. "Sensitive Fluorescent Sensor for Recognition of HIV-1 dsDNA by Using Glucose Oxidase and Triplex DNA." Journal of Analytical Methods in Chemistry 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/8298365.

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A sensitive fluorescent sensor for sequence-specific recognition of double-stranded DNA (dsDNA) was developed on the surface of silver-coated glass slide (SCGS). Oligonucleotide-1 (Oligo-1) was designed to assemble on the surface of SCGS and act as capture DNA, and oligonucleotide-2 (Oligo-2) was designed as signal DNA. Upon addition of target HIV-1 dsDNA (Oligo-3•Oligo-4), signal DNA could bind on the surface of silver-coated glass because of the formation of C•GoC in parallel triplex DNA structure. Biotin-labeled glucose oxidase (biotin-GOx) could bind to signal DNA through the specific inte

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Martinez-Zaguilan, R., G. M. Martinez, F. Lattanzio, and R. J. Gillies. "Simultaneous measurement of intracellular pH and Ca2+ using the fluorescence of SNARF-1 and fura-2." American Journal of Physiology-Cell Physiology 260, no. 2 (1991): C297—C307. http://dx.doi.org/10.1152/ajpcell.1991.260.2.c297.

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Upon cell stimulation with hormones and other mitogens, a variety of biochemical and physiological responses occur within the first few minutes. Changes in both intracellular pH (pHin) and intracellular Ca2+ concentration ([Ca2+]in) are prominent and play a major role in the signal transduction mechanism leading to the physiological response, i.e., secretion, neurotransmission, proliferation, or differentiation. However, it is not clear whether these ions work independently in the activation pathway leading to a particular physiological response. The fluorescence characteristics of most Ca2+ i

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Mackenzie, C., C. Rowley-Williams, M. Achour, D. Blumer, M. Joosten, and M. Rowe. "Potential for Measurement of Corrosion-Inhibitor-Micelle Presence as an Indicator of Optimum Dose." SPE Journal 17, no. 02 (2012): 393–401. http://dx.doi.org/10.2118/130285-pa.

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Summary This paper discusses the principle and proof of concept of a novel corrosion-management tool based on maintaining optimum corrosion-inhibitor dose in an inhibited environment. Film-forming corrosion inhibitors typically contain active ionic surfactant molecules, which adsorb on surfaces and form a protective barrier against corrosion. Upon saturation of surfaces by the inhibitor, the molecules are found in the aqueous phase as micelles or in the oil phase as reverse micelles. The proposed technique is based on the hypothesis that the presence of these micelles in the water phase could

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Soleimaninejad, H., F. Matroodi, and S. H. Tavassoli. "Raman Spectroscopy of Iranian Region Calcite Using Pulsed Laser: An Approach of Fluorescence Suppression by Time-Gating Method." Journal of Spectroscopy 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/254964.

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The effect of time-gating method in Raman spectroscopy for fluorescence suppression of Iranian region calcite is investigated. Experiments are done using an Nd:YAG laser with a pulse durations of 10 ns at wavelength 532 nm. Seven samples from different places are examined. In order to obtain the optimum gate width for fluorescence suppression, a series of experiments is carried out at different gate widths. Raman-to-fluorescence (R/F) and fluorescence-to-laser peak (F/L) ratios are compared at gated and nongated experiments. Applying the optimum gate width leads to an effective reduction of fl

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33

Tsakama, Madalitso, Xiaochi Ma, Yonghuan He, Weihua Chen, and Xiaofeng Dai. "A Simple Mannose-Coated Poly (p-Phenylene Ethynylene) for Qualitative Bacterial Capturing." Molecules 23, no. 8 (2018): 2056. http://dx.doi.org/10.3390/molecules23082056.

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A mannose-functionalized poly (p-phenylene ethynylene) was rationally designed to achieve selective detection of bacteria. The polymer was constructed as a signaling unit and was modified by attaching aminoethyl mannose using the carboxylic acid group at the end of the linker. Incubation of Escherichia coli with the polymer yielded fluorescent bacteria aggregates through polyvalent interactions. The utility of the mannose functionalized polymer to detect E. coli expressing functional FimH mannose-specific lectin on their surface was also demonstrated. The sugar units displayed on the surface o

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Hammood, Mohammad K., and Maryam Hamed. "Simultaneous Determination of Trace Mefenamic Acid in Pharmaceutical Samples via Flow Injection Fluorometry." International Journal of Drug Delivery Technology 10, no. 03 (2020): 395–401. http://dx.doi.org/10.25258/ijddt.10.3.16.

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Mefenamic acid belongs to non-steroidal anti-inflammatory drugs that are used widely for the treatment of analgesia. Our aim from this study is to establish a new assay for the quantitative determination of mefenamic acid (MFA) in the pharmaceutical sample by two sensitive and rapid flow injection-fluorometric methods. A homemade fluorometer was used in fluorescence measurements, which using solid-state laser diode 405 and 532 nm as a source, combined with a continuous flow injection technique. The first method depends on the effect of MFA on calcein blue (CLB) fluorescence at 405 nm. Another

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Ershadi, Saba, Abolghasem Jouyban, Ommoleila Molavi, and Ali Shayanfar. "Development of a Terbium-Sensitized Fluorescence Method for Analysis of Silibinin." Journal of AOAC INTERNATIONAL 100, no. 3 (2017): 686–91. http://dx.doi.org/10.5740/jaoacint.16-0208.

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Abstract Silibinin is a natural flavonoid with potent anticancer properties, as shown in both in vitro and in vivo experiments. Various methods have been used for silibinin analysis. Terbium-sensitized fluorescence methods have been widely used for the determination of drugs in pharmaceutical preparations and biological samples in recent years. The present work is aimed at providing a simple analytical method for the quantitative determination of silibinin in aqueous solutions based on the formation of a fluorescent complex with terbium ion. Terbium concentration, pH, and volume of buffer, the

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Martínez Maestro, Laura, Carlos Jacinto, Uéslen Rocha, et al. "Optimum quantum dot size for highly efficient fluorescence bioimaging." Journal of Applied Physics 111, no. 2 (2012): 023513. http://dx.doi.org/10.1063/1.3676251.

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Kosson, Ryszard. "The effect of storage temperature of cucumber fruit on chlorophyll fluorescence." Acta Agrobotanica 53, no. 1 (2013): 57–64. http://dx.doi.org/10.5586/aa.2000.007.

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The effect of three storage temperature levels: 12,5°C, 20°C, and 1,5°C on basic indexes of chlorophyll fluorescence of cucumber fruits was studied. The greenhouse grown cucumber fruits cv. Wiktor F1 were stored in perforated polyethylene bags or without packages. The minimum chlorophyll fluorescence (Fo), maximum chlorophyll fluorescence (Fm), variable chlorophyll fluorescence (Fv) and relative variable fluorescence (Fv/Fm) of the cucumber peel were measured. Relative variable fluorescence was decTeasing when cucumbers were stored at temperature lower or higher than optimum level. The chlorop

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Feng, Wenlin, Huaping Lin, and Honggang Liu. "Photoluminescence and Crystal-Field Analysis of Pr3+-Doped SrMoO4 Phosphors." Zeitschrift für Naturforschung A 70, no. 1 (2015): 11–16. http://dx.doi.org/10.1515/zna-2014-0184.

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AbstractThe phosphor SrMoO4:Pr3+ was successfully prepared by high-temperature solid-state reaction process, and characterised by X-ray diffraction (XRD), scanning electron microscope (SEM), and fluorescence spectrometer. The results show that the prepared SrMoO4:Pr3+ has a scheelite structure with pure phase and represents leaf-like shapes with good dispersity. The strong electron absorbabilities are located at 220–300 nm (charge transfer band), 448, 474, and 487 nm, respectively. The emission spectrum of the SrMoO4:Pr3+ phosphor was characterised, which peaked at 529, 545, 554, 600, 619, and

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Ferri, Gian-Luca, Jorma Isola, Peter Berger, and Gabriele Giro. "Direct Eye Visualization of Cy5 Fluorescence for Immunocytochemistry and In Situ Hybridization." Journal of Histochemistry & Cytochemistry 48, no. 3 (2000): 437–44. http://dx.doi.org/10.1177/002215540004800314.

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Cyanine 5.18 (or Cy5) is a fluorochrome emitting in the long-red/far-red range, usually regarded as unsuitable for direct observation by the human eye. We describe here the optimization of a direct visualization approach to Cy5 labeling, based on a standard fluorescence microscope with mercury light excitation and applicable to both immunocytochemistry and fluorescent in situ hybridization. Crucial factors were (a) an excitation path in the microscope not absorbing light in the orange-red range, up to 640 nm, (b) a 588-640-nm excitation filter range, distinctly below the excitation optimum for

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Xing, Xiao Feng, Liang Liang Luo, Yu Ping Guo, Wei Min Gao, and Liang Hu. "Synthesis and Characterization of Asparagine-Modified and Terbium-Doped Spherical Hydroxyapatite Nanoparticle." Key Engineering Materials 697 (July 2016): 62–66. http://dx.doi.org/10.4028/www.scientific.net/kem.697.62.

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The spherical hydroxyapatite nanoparticles (HAP) were synthesized by hydro-thermal method, and calcium nitrate, terbium oxide, diammonium hydrogen phosphate were used as raw materials with the help of surfactant L-Asparagine. Meanwhile, different amount of Tb was added to investigate the effect of different terbium dropping amount on the properties of HAP. The structure, morphology and luminescent of the obtained HAP that was characterized via X-ray powder diffraction (XRD), fluorescence spectrometer (PL) and transmission electron microscope (TEM). Results showed that spherical HAP which in av

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Al-Mehdi, Abu-Bakr, Mita Patel, Abu Haroon, et al. "Increased Depth of Cellular Imaging in the Intact Lung Using Far-Red and Near-Infrared Fluorescent Probes." International Journal of Biomedical Imaging 2006 (2006): 1–7. http://dx.doi.org/10.1155/ijbi/2006/37470.

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Scattering of shorter-wavelength visible light limits the fluorescence imaging depth of thick specimens such as whole organs. In this study, we report the use of four newly synthesized near-infrared and far-red fluorescence probes (excitation/emission, in nm: 644/670; 683/707; 786/814; 824/834) to image tumor cells in the subpleural vasculature of the intact rat lungs. Transpelural imaging of tumor cells labeled with long-wavelength probes and expressing green fluorescent protein (GFP; excitation/emission 488/507 nm) was done in the intact rat lung after perfusate administration or intravenous

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Żamojć, Krzysztof, Dominik Kamrowski, Magdalena Zdrowowicz, et al. "A Pentapeptide with Tyrosine Moiety as Fluorescent Chemosensor for Selective Nanomolar-Level Detection of Copper(II) Ions." International Journal of Molecular Sciences 21, no. 3 (2020): 743. http://dx.doi.org/10.3390/ijms21030743.

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Herein, we have investigated principally with the use of UV and fluorescence (steady-state and time-resolved) spectroscopy the interactions between selected pentapeptides with tyrosine residue (EYHHQ, EHYHQ, EHHQY, and KYHHE) and various metal ions (Cu2+, Mn2+, Co2+, Ni2+, Zn2+, Cr3+, Cd2+, Ag+, Pb2+, Sr2+, Ba2+, Ca2+, Mg2+, Al3+, Fe2+, and Ga3+) in order to establish the relationship between the position of a tyrosine residue in the peptide sequence and the metal ion-binding properties. Among the peptides studied, EHYHQ was evaluated as an efficient and selective ligand for developing a chemo

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Macdonald, Brian F., John L. Hammons, Randy R. Gore, Jon R. Maple, and E. L. Wehry. "Site-Selection Fluorescence Spectrometry of Polycyclic Aromatic Hydrocarbons in Vapor-Deposited Argon Matrices." Applied Spectroscopy 42, no. 6 (1988): 1079–83. http://dx.doi.org/10.1366/0003702884430281.

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The use of tunable laser excitation to effect significant sharpening in the inhomogeneously-broadened fluorescence spectra of polycyclic aromatic hydrocarbons (PAHs) isolated in argon matrices at 15 K is reported. The broad-band-excited fluorescence spectra of most PAHs in solid argon exhibit complex multiplet structures assumed due to the location of individual PAH molecules in different types of discrete “sites” in the polycrystalline matrix. Under laser excitation, the fluorescence spectra of PAHs are strongly dependent on excitation wavelength. For most PAHs, there exists an “optimum” exci

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Zeng, Yun Long, Ya Jing Wang, Zhong Hua Su, and Chun Ran Tang. "Determination of Hydrogen Peroxide Residue in Food Using CdS Quantum Dots as Fluorescence Probes." Advanced Materials Research 455-456 (January 2012): 1189–94. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.1189.

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A simple and accurate method for determination of hydrogen peroxide (H2O2) using carboxymethyl cellulose coated CdS quantum dots (QDs) as a fluorescence probe was established. The influence factors of the fluorescence quenching system and the optimum conditions were investigated for analysis of hydrogen peroxide. It was found that the maximum relative fluorescence quenching intensity produced at pH 8.5 in 0.035 mol/L KH2PO4-Na2HPO4, when the concentration of CdS QDs was 1.9×10-3 mol/L and the reacting time and temperature were 45 minutes and 30°C, respectively. Under the optimum conditions, th

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Melouki, B., M. Lieutier, and A. Lefort. "Détermination du courant d'arc par utilisation de fibres optiques fluorescentes." Journal de Physique III 7, no. 2 (1997): 441–50. http://dx.doi.org/10.1051/jp3:1997131.

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Pan, Qing Shan, Wei Liu, Ping Yi, Du Shu Huang, Na Wu, and Ze Feng Wang. "Study on Determination of Trace Mercury in Chinese Herbal Medicines by Hydride Generation-Atomic Fluorescence Spectrometry." Advanced Materials Research 554-556 (July 2012): 1669–72. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.1669.

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A hydride atomic fluorescence spectrometry method was developed for the determination of trace mercury in Chinese herbal medicines. A digestion system using HNO3-H2O2 under high pressure was applied for the pretreatment of the samples. The operating condition of the instrument were optimized. The effect of the acid in sample solution and carrier liquid, and the effect of reducing agent KBH4 in solution to the determination of mercury were studied. Under the optimum conditions. Five kinds of Chinese herbal medicines in Yun Nan province of China was measured. There was a good linear coefficient

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Zhu, Jia Ming, Zhong Min Wang, Song Tao, and Ying Peng. "Effect of Surfactants on Morphology and Luminescent Properties of YAG:Ce Phosphors." Materials Science Forum 815 (March 2015): 313–17. http://dx.doi.org/10.4028/www.scientific.net/msf.815.313.

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Using anionic surfactant sodium dodecylsulfate (SDS), cationic surfactant cetyltrimethylammonium bromide (CTAB) and nonionic surfactant polyethylene glycol 20000 (PEG20000) and glyceryl monostearate (monostearin) respectively, Ce-doped Y3Al5O12(YAG:Ce3+(6%)) yellow phosphors were prepared by a combination method of high energy ball milling and solid state reaction. The effects of surfactant type on structure, morphology and luminescence properties were investigated by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and fluorescence spectrometer. The results showed

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Ghoreishi, Seyedeh Masoumeh, Atena Najdian, Sina Yadegari, et al. "The Use of Carbon Quantum Dot as Alternative of Stannous Chloride Application in Radiopharmaceutical Kits." Contrast Media & Molecular Imaging 2020 (November 6, 2020): 1–11. http://dx.doi.org/10.1155/2020/4742158.

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Even today, technetium-99m is a radionuclide choice for diagnostic in nuclear medicine. The unique chemical and physical properties of technetium-99m make it suitable as an available radionuclide in many centers. In this study, we examined the potential of CQD as a reducing agent in the MDP kit. Citric acid-derived CQD was synthesized and confirmed by FT-IR, TEM, UV-Vis, XPS, and surface analysis. No cytotoxicity was observed by the MTT assay. They were reducing properties of the CQD confirmed by fluorescence microscopy. The MDP kit is prepared by evaluating different parameters that affect th

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Xu, Shi Chao, Yue Qian Yang, Yan Shan Liu, et al. "An Enhanced Luminescent CdTe/ZnS Core-Shell Quantum Dot: Synthesis, Characterization, and its Optical Properties." Advanced Materials Research 217-218 (March 2011): 212–15. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.212.

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The core-shell CdTe/ZnS quantum dots were prepared with an improved process in aqueous phase. CdTe QDs were synthesized under conditions of pH 9.1, 96 °C, refluxing for 5h, and which was used as core material; ZnS was formed as shell material to enhance the optical properties. Optical properties were characterized with fluorescence spectrum (FS), and morphology of QDs was investigated via transmission electron microscopy (TEM) method. Moreover, composition and formation of CdTe/ZnS core-shell QDs was characterized via x-ray diffraction (XRD) method. Optimum conditions were investigated to obta

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Demirkaya-Miloglu, Fatma, Mehmet Emrah Yaman, and Yucel Kadioglu. "Optimization of a spectrofluorimetric method based on a central composite design for the determination of potassium losartan in pharmaceutical products." Brazilian Journal of Pharmaceutical Sciences 50, no. 3 (2014): 611–19. http://dx.doi.org/10.1590/s1984-82502014000300021.

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Here, a spectrofluorimetric method for the determination of potassium losartan (PL) in pharmaceutical products is described. The effects of critical parameters, pH, acid molarity, and temperature, on the fluorescence intensity of PL were analyzed, and these parameters were optimized using a central composite design (CCD). The highest fluorescent intensity at excitation (λex) and emission (λem) wavelengths of 248 nm and 410 nm, respectively, was achieved using 0.01 M sulfurous acid (pH 2) at 21.6 °C. Under optimum conditions, the method was linear from 0.025-0.5 µg/mL, with a reasonably high co

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