Collective Effects Influencing Fluorescence Emission
Abstract
Dramatic improvement of fluorescence sensing technologies can be achieved by combining molecular emitters into clusters, nanoparticles, and aggregates. This chapter addresses the new effects that appear on incorporation of dyes into these supramolecular structures. We consider different types of intermolecular interactions that influence the emission spectra, focusing on spectral changes that are observed on concentrating organic dyes in confined media. The mechanisms of energy transfer between fluorescence emitters are discussed. They provide possibilities for increasing the dynamic range of sensing response by extending the variation of intensity (light-harvesting, superquenching), and wavelength range (directed transfer, wavelength-shifting).
Graphical Abstract
Keywords
Excimers Intermolecular interactions Light-harvesting Red-edge effects Resonance energy transfer Superquenching Wavelength-shiftingReferences
- 1.Valeur B (2002) Molecular fluorescence. Wiley VCH, WeinheimGoogle Scholar
- 2.Demchenko AP (2009) Introduction to fluorescence sensing. Springer, AmsterdamCrossRefGoogle Scholar
- 3.Resch-Genger U, Grabolle M, Nitschke R, Nann T, Resch-Genger U, Grabolle M, Nitschke R, Nann T (2010) Nanocrystals and nanoparticles vs. molecular fluorescent labels as reporters for bioanalysis and the life sciences. A critical comparison. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. II. Springer Ser Fluoresc 9:3–40Google Scholar
- 4.Patsenker LD, Tatarets AL, Terpetschnig EA (2010) Long-wavelength probes and labels based on cyanines and squaraines. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. I. Springer Ser Fluoresc 8:65–104Google Scholar
- 5.Przhonska OV, Scott Webster S, Padilha LA, Hu H, Kachkovski AD, Hagan DJ, Stryland EW V (2010) Two-photon absorption in near-IR conjugated molecules: design strategy and structure–property relations. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. I. Springer Ser Fluoresc 8:105–147Google Scholar
- 6.Kim E, Park SB (2010) Discovery of New Fluorescent Dyes: targeted Syn-thesis or combinatorial approach? In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. I. Springer Ser Fluoresc 8:149–186Google Scholar
- 7.Borisov SM, Mayr T, Mistlberger G, Klimant I (2010) Dye-doped polymeric particles for sensing and imaging. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. II. Springer Ser Fluoresc 9:193–228Google Scholar
- 8.Liang S, John CL, Xu S, Chen J, Jin Y, Yuan Q, Tan W, Zhao JX (2010) Silica-based nanoparticles: design and properties. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. II. Springer Ser Fluoresc 9:229–251Google Scholar
- 9.Yao H (2010) Prospects for organic dye nanoparticles. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. II. Springer Ser Fluoresc 9:285–303Google Scholar
- 10.Suppan P, Ghoneim N (1997) Solvatochromism. Royal Society of Chemistry, CambridgeGoogle Scholar
- 11.Bakhshiev NG (1972) Spectroscopy of intermolecular interactions. Nauka, LeningradGoogle Scholar
- 12.Mataga N, Kubota T (1970) Molecular interactions and electronic spectra. Marcel Dekker, New YorkGoogle Scholar
- 13.Tomin VI (2010) Physical principles behind spectroscopic response of organic fluorophores to intermolecular interactions. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. I. Springer Ser Fluoresc 8:189–223Google Scholar
- 14.Liptay W (1969) Electrochromism and solvatochromism. Angew Chem Int Ed 8:177–188CrossRefGoogle Scholar
- 15.Callis PR (2010) Electrochromism and solvatochromism in fluorescence response of organic dyes. A nanoscopic view. In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. I. Springer Ser Fluoresc 8:309–330Google Scholar
- 16.Maroncelli M, Macinnis J, Fleming GR (1989) Polar solvent dynamics and electron-transfer reactions. Science 243:1674–1681CrossRefGoogle Scholar
- 17.Hsieh C-C, Ho M-L, Chou P-T (2010) Organic dyes with excited-state transforma-tions (electron, charge and proton transfers). In: Demchenko AP (ed) Advanced fluorescence reporters in chemistry and biology. I. Springer Ser Fluoresc 8:225–266Google Scholar
- 18.Wang S-L, Lee T-C, Ho T-I (2002) Excited state proton transfer and steric effect on the hydrogen bonding interaction of the styrylquinoline system. J Photochem Photobiol A Chem 151:21–26CrossRefGoogle Scholar
- 19.Druzhinin SI, Kovalenko SA, Senyushkina TA, Demeter A, Januskevicius R, Mayer P, Stalke D, Machinek R, Zachariasse KA (2009) Intramolecular charge transfer with 4-fluorofluorazene and the flexible 4-fluoro-N-phenylpyrrole. J Phys Chem A 113:9304–20CrossRefGoogle Scholar
- 20.Jozefowicz M, Heldt JR (2003) Preferential solvation of fluorenone and 4-hydroxyfluorenone in binary solvent mixtures. Chem Phys 294:105–116CrossRefGoogle Scholar
- 21.Pivovarenko VG, Klueva AV, Doroshenko AO, Demchenko AP (2000) Bands separation in fluorescence spectra of ketocyanine dyes: evidence for their complex formation with monohydric alcohols. Chem Phys Lett 325:389–398CrossRefGoogle Scholar
- 22.Shynkar VV, Klymchenko AS, Piemont E, Demchenko AP, Mely Y (2004) Dynamics of intermolecular hydrogen bonds in the excited states of 4′-dialkylamino-3-hydroxyflavones. On the pathway to an ideal fluorescent hydrogen bonding sensor. J Phys Chem A 108:8151–8159CrossRefGoogle Scholar
- 23.Balter A, Nowak W, Pawelkiewicz W, Kowalczyk A (1988) Some remarks on the interpretation of the spectral properties of prodan. Chem Phys Lett 143:565–570CrossRefGoogle Scholar
- 24.Catalan J, Perez P, Laynez J, Garcia-Blanco F (1991) Analysis of the solvent effect on the photophysics properties of 6-propionyl-2-(dimethylamino)naphthalene (PRODAN). J Fluoresc 4:215–223CrossRefGoogle Scholar
- 25.Moyano F, Biasutti MA, Silber JJ, Correa NM (2006) New insights on the behavior of PRODAN in homogeneous media and in large unilamellar vesicles. J Phys Chem B 110:11838–11846CrossRefGoogle Scholar
- 26.Yuan MS, Liu ZQ, Fang Q (2007) Donor-and-acceptor substituted truxenes as multifunctional fluorescent probes. J Org Chem 72:7915–22CrossRefGoogle Scholar
- 27.Yang CJ, Jockusch S, Vicens M, Turro NJ, Tan W (2005) Light-switching excimer probes for rapid protein monitoring in complex biological fluids. Proc Natl Acad Sci USA 102:17278–83CrossRefGoogle Scholar
- 28.Kadirvel M, Arsic B, Freeman S, Bichenkova EV (2008) Exciplex and excimer molecular probes: detection of conformational flip in a myo-inositol chair. Org Biomol Chem 6:1966–72CrossRefGoogle Scholar
- 29.Deepak VD, Asha SK (2009) Photophysical investigation into the self-organization in pyrene-based urethane methacrylate comb polymer. J Phys Chem B 113:11887–97CrossRefGoogle Scholar
- 30.Taniguchi T, Takeuchi N, Kobaru S, Nakahira T (2008) Preparation of highly monodisperse fluorescent polymer particles by miniemulsion polymerization of styrene with a polymerizable surfactant. J Colloid Interface Sci 327:58–62CrossRefGoogle Scholar
- 31.Búcsiová L, HrdloviI P, Chmela S (2001) Spectral characteristics of fluorescence probes based on pyrene in solution and in polymer matrix. J Photochem Photobiol A Chem 143:59–68CrossRefGoogle Scholar
- 32.Kim Y, Bouffard J, Kooi SE, Swager TM (2005) Highly emissive conjugated polymer excimers. J Am Chem Soc 127:13726–31CrossRefGoogle Scholar
- 33.Bhattacharyya K, Chowdhury M (1993) Environmental and magnetic field effects on exciplex and twisted charge transfer emission. Chem Rev 93:507–535CrossRefGoogle Scholar
- 34.Bichenkova EV, Gbaj A, Walsh L, Savage HE, Rogert C, Sardarian AR, Etchells LL, Douglas KT (2007) Detection of nucleic acids in situ: novel oligonucleotide analogues for target-assembled DNA-mounted exciplexes. Org Biomol Chem 5:1039–51CrossRefGoogle Scholar
- 35.Kasha M, Kasha M (1991) Energy transfer, charge transfer, and proton transfer in molecular composite systems. Basic Life Sci 58:231–251, discussion 251–255Google Scholar
- 36.Madjet Mel A, Muh F, Renger T (2009) Deciphering the influence of short-range electronic couplings on optical properties of molecular dimers: application to “special pairs” in photosynthesis. J Phys Chem B 113:12603–14CrossRefGoogle Scholar
- 37.Ishizaki A, Fleming GR (2009) Unified treatment of quantum coherent and incoherent hopping dynamics in electronic energy transfer: reduced hierarchy equation approach. J Chem Phys 130:234111CrossRefGoogle Scholar
- 38.Saini S, Srinivas G, Bagchi B (2009) Distance and orientation dependence of excitation energy transfer: from molecular systems to metal nanoparticles. J Phys Chem B 113:1817–32CrossRefGoogle Scholar
- 39.Clapp AR, Medintz IL, Mattoussi H (2006) Forster resonance energy transfer investigations using quantum-dot fluorophores. Chemphyschem 7:47–57CrossRefGoogle Scholar
- 40.Nemkovich NA, Rubinov AN, Tomin VI (1991) Inhomogeneous broadening of electronic spectra of dye molecules in solutions. In: Lakowicz JR (ed) Topics in fluorescence spectroscopy. Plenum, New York, pp 367–428Google Scholar
- 41.Demchenko AP, Sytnik AI (1991) Site-selectivity in excited-state reactions in solutions. J Phys Chem 95:10518–10524CrossRefGoogle Scholar
- 42.Vincent M, Gallay J, Demchenko AP (1995) Solvent relaxation around the excited-state of indole – analysis of fluorescence lifetime distributions and time-dependence spectral shifts. J Phys Chem 99:14931–14941CrossRefGoogle Scholar
- 43.Nemkovich NA, Rubinov AN, Tomin VI (1981) Kinetics of luminescence spectra of rigid dye solutions due to directed electronic-energy transfer. J Lumin 23:349–361CrossRefGoogle Scholar
- 44.Demchenko AP (2008) Site-selective red-edge effects. Chapter 4. Methods in enzymology. Academic, New York, pp 59–78Google Scholar
- 45.Demchenko AP (2002) The red-edge effects: 30 years of exploration. Luminescence 17:19–42CrossRefGoogle Scholar
- 46.Chattopadhyay A, Mukherjee S, Raghuraman H (2002) Reverse micellar organization and dynamics: a wavelength-selective fluorescence approach. J Phys Chem B 106:13002–13009CrossRefGoogle Scholar
- 47.Demchenko AP (1986) Ultraviolet spectroscopy of proteins. Springer Verlag, Berlin, Heidelberg, New YorkCrossRefGoogle Scholar
- 48.Haldar S, Chattopadhyay A (2007) Dipolar relaxation within the protein matrix of the green fluorescent protein: a red-edge excitation shift study. J Phys Chem B 111:14436–9CrossRefGoogle Scholar
- 49.Barja BC, Chesta C, Atvars TD, Aramendia PF (2005) Relaxations in poly(vinyl alcohol) and in poly(vinyl acetate) detected by fluorescence emission of 4-aminophthalimide and prodan. J Phys Chem B 109:16180–7CrossRefGoogle Scholar
- 50.Dias FB, King S, Monkman AP, Perepichka II, Kryuchkov MA, Perepichka IF, Bryce MR (2008) Dipolar stabilization of emissive singlet charge transfer excited states in polyfluorene copolymers. J Phys Chem B 112:6557–66CrossRefGoogle Scholar
- 51.Irimpan L, Krishnan B, Deepthy A, Nampoori VPN, Radhakrishnan P (2007) Excitation wavelength dependent fluorescence behaviour of nano colloids of ZnO. J Phys D Appl Phys 40:5670–5674CrossRefGoogle Scholar
- 52.Johansson MK, Cook RM (2003) Intramolecular dimers: a new design strategy for fluorescence-quenched probes. Chemistry 9:3466–3471CrossRefGoogle Scholar
- 53.Runnels LW, Scarlata SF (1995) Theory and application of fluorescence homotransfer to melittin oligomerization. Biophys J 69:1569–83CrossRefGoogle Scholar
- 54.Varnavski OP, Ostrowski JC, Sukhomlinova L, Twieg RJ, Bazan GC, Goodson T (2002) Coherent effects in energy transport in model dendritic structures investigated by ultrafast fluorescence anisotropy spectroscopy. J Am Chem Soc 124:1736–1743CrossRefGoogle Scholar
- 55.Serin JM, Brousmiche DW, Frechet JMJ (2002) Cascade energy transfer in a conformationally mobile multichromophoric dendrimer. Chem Commun 21:2605–2607CrossRefGoogle Scholar
- 56.Haustein E, Jahnz M, Schwille P (2003) Triple FRET: a tool for studying long-range molecular interactions. Chemphyschem 4:745–8CrossRefGoogle Scholar
- 57.Ziessel R, Goze C, Ulrich G, Cesario M, Retailleau P, Harriman A, Rostron JP (2005) Intramolecular energy transfer in pyrene-bodipy molecular dyads and triads. Chemistry 11:7366–78CrossRefGoogle Scholar
- 58.Harriman A, Mallon L, Ziessel R (2008) Energy flow in a purpose-built cascade molecule bearing three distinct chromophores attached to the terminal acceptor. Chemistry 14:11461–73CrossRefGoogle Scholar
- 59.Gao J, Strassler C, Tahmassebi D, Kool ET (2002) Libraries of composite polyfluors built from fluorescent deoxyribosides. J Am Chem Soc 124:11590–1CrossRefGoogle Scholar
- 60.Huang B, Wu HK, Bhaya D, Grossman A, Granier S, Kobilka BK, Zare RN (2007) Counting low-copy number proteins in a single cell. Science 315:81–84CrossRefGoogle Scholar
- 61.Szollosi J, Damjanovich S, Matyus L (1998) Application of fluorescence resonance energy transfer in the clinical laboratory: routine and research. Cytometry 34:159–79CrossRefGoogle Scholar
- 62.Wang S, Gaylord BS, Bazan GC (2004) Fluorescein provides a resonance gate for FRET from conjugated polymers to DNA intercalated dyes. J Am Chem Soc 126:5446–51CrossRefGoogle Scholar
- 63.Aneja A, Mathur N, Bhatnagar PK, Mathur PC (2008) Triple-FRET technique for energy transfer between conjugated polymer and TAMRA dye with possible applications in medical diagnostics. J Biol Phys 34:487–93CrossRefGoogle Scholar
- 64.Chen CH, Liu KY, Sudhakar S, Lim TS, Fann W, Hsu CP, Luh TY (2005) Efficient light harvesting and energy transfer in organic–inorganic hybrid multichromophoric materials. J Phys Chem B 109:17887–91CrossRefGoogle Scholar
- 65.Frigoli M, Ouadahi K, Larpent C (2009) A cascade FRET-mediated ratiometric sensor for Cu2+ ions based on dual fluorescent ligand-coated polymer nanoparticles. Chemistry 15:8319–30CrossRefGoogle Scholar
- 66.Forde TS, Hanley QS (2005) Following FRET through five energy transfer steps: spectroscopic photobleaching, recovery of spectra, and a sequential mechanism of FRET. Photochem Photobiol Sci 4:609–616CrossRefGoogle Scholar
- 67.May V (2009) Beyond the Forster theory of excitation energy transfer: importance of higher-order processes in supramolecular antenna systems. Dalton Trans 45:10086–105CrossRefGoogle Scholar
- 68.Beljonne D, Curutchet C, Scholes GD, Silbey RJ (2009) Beyond Forster resonance energy transfer in biological and nanoscale systems. J Phys Chem B 113:6583–99CrossRefGoogle Scholar
- 69.Jameson DM, Croney JC (2003) Fluorescence polarization: past, present and future. Comb Chem High Throughput Screen 6:167–73CrossRefGoogle Scholar
- 70.Hildebrandt N, Charbonniere LJ, Lohmannsroben HG (2007) Time-resolved analysis of a highly sensitive Forster resonance energy transfer immunoassay using terbium complexes as donors and quantum dots as acceptors. J Biomed Biotechnol 2007:79169CrossRefGoogle Scholar
- 71.Charbonniere LJ, Hildebrandt N, Ziessel RF, Lohmannsroben HG (2006) Lanthanides to quantum dots resonance energy transfer in time-resolved fluoro-immunoassays and luminescence microscopy. J Am Chem Soc 128:12800–9CrossRefGoogle Scholar
- 72.Morrison LE (1988) Time-resolved detection of energy transfer: theory and application to immunoassays. Anal Biochem 174:101–20CrossRefGoogle Scholar
- 73.Algar WR, Krull UJ (2008) Quantum dots as donors in fluorescence resonance energy transfer for the bioanalysis of nucleic acids, proteins, and other biological molecules. Anal Bioanal Chem 391:1609–18CrossRefGoogle Scholar
- 74.Medintz IL, Mattoussi H (2009) Quantum dot-based resonance energy transfer and its growing application in biology. Phys Chem Chem Phys 11:17–45CrossRefGoogle Scholar
- 75.Thomas SW 3rd, Joly GD, Swager TM (2007) Chemical sensors based on amplifying fluorescent conjugated polymers. Chem Rev 107:1339–86CrossRefGoogle Scholar
- 76.Kikuchi K, Takakusa H, Nagano T (2004) Recent advances in the design of small molecule-based FRET sensors for cell biology. Trends Analyt Chem 23:407–415CrossRefGoogle Scholar
- 77.Lakowicz JR (2005) Radiative decay engineering 5: metal-enhanced fluorescence and plasmon emission. Anal Biochem 337:171–94CrossRefGoogle Scholar
- 78.Aslan K, Gryczynski I, Malicka J, Matveeva E, Lakowicz JR, Geddes CD (2005) Metal-enhanced fluorescence: an emerging tool in biotechnology. Curr Opin Biotechnol 16:55–62CrossRefGoogle Scholar
- 79.Gryczynski I, Malicka J, Jiang W, Fischer H, Chan WCW, Gryczynski Z, Grudzinski W, Lakowicz JR (2005) Surface-plasmon-coupled emission of quantum dots. J Phys Chem B 109:1088–1093CrossRefGoogle Scholar
- 80.Lee SY, Nakaya K, Hayashi T, Hara M (2009) Quantitative study of the gold-enhanced fluorescence of CdSe/ZnS nanocrystals as a function of distance using an AFM probe. Phys Chem Chem Phys 11:4403–9CrossRefGoogle Scholar
- 81.Park HJ, Vak D, Noh YY, Lim B, Kim DY (2007) Surface plasmon enhanced photoluminescence of conjugated polymers. Appl Phys Lett 90:161107CrossRefGoogle Scholar
- 82.Zhang YX, Aslan K, Previte MJR, Malyn SN, Geddes CD (2006) Metal-enhanced phosphorescence: Interpretation in terms of triplet-coupled radiating plasmons. J Phys Chem B 110:25108–25114CrossRefGoogle Scholar
- 83.Giorgetti E, Cicchi S, Muniz-Miranda M, Margheri G, Del Rosso T, Giusti A, Rindi A, Ghini G, Sottini S, Marcelli A, Foggi P (2009) Forster resonance energy transfer (FRET) with a donor–acceptor system adsorbed on silver or gold nanoisland films. Phys Chem Chem Phys 11:9798–803CrossRefGoogle Scholar
- 84.Tovmachenko OG, Graf C, van den Heuvel DJ, van Blaaderen A, Gerritsen HC (2006) Fluorescence enhancement by metal-core/silica-shell nanoparticles. Adv Mater 18:91–95CrossRefGoogle Scholar
- 85.Malicka J, Gryczynski I, Gryczynski Z, Lakowicz JR (2003) Effects of fluorophore-to-silver distance on the emission of cyanine-dye-labeled oligonucleotides. Anal Biochem 315:57–66CrossRefGoogle Scholar
- 86.Cade NI, Ritman-Meer T, Kwaka K, Richards D (2009) The plasmonic engineering of metal nanoparticles for enhanced fluorescence and Raman scattering. Nanotechnology 20:285201CrossRefGoogle Scholar
- 87.Wilson R, Cossins AR, Spiller DG (2006) Encoded microcarriers for high-throughput multiplexed detection. Angew Chem Int Ed Engl 45:6104–17CrossRefGoogle Scholar
- 88.Ma Q, Wang XY, Li YB, Shi YH, Su XG (2007) Multicolor quantum dot-encoded microspheres for the detection of biomolecules. Talanta 72:1446–1452CrossRefGoogle Scholar
- 89.Eastman PS, Ruan WM, Doctolero M, Nuttall R, De Feo G, Park JS, Chu JSF, Cooke P, Gray JW, Li S, Chen FQF (2006) Qdot nanobarcodes for multiplexed gene expression analysis. Nano Lett 6:1059–1064CrossRefGoogle Scholar
- 90.Clapp AR, Medintz IL, Uyeda HT, Fisher BR, Goldman ER, Bawendi MG, Mattoussi H (2005) Quantum dot-based multiplexed fluorescence resonance energy transfer. J Am Chem Soc 127:18212–18221CrossRefGoogle Scholar
- 91.Sekar RB, Periasamy A (2003) Fluorescence resonance energy transfer (FRET) microscopy imaging of live cell protein localizations. J Cell Biol 160:629–33CrossRefGoogle Scholar
- 92.Umezawa Y (2005) Genetically encoded optical probes for imaging cellular signaling pathways. Biosens Bioelectron 20:2504–11CrossRefGoogle Scholar
- 93.Miyawaki A (2003) Fluorescence imaging of physiological activity in complex systems using GFP-based probes. Curr Opin Neurobiol 13:591–6CrossRefGoogle Scholar
- 94.Xu X, Brzostowski JA, Jin T (2006) Using quantitative fluorescence microscopy and FRET imaging to measure spatiotemporal signaling events in single living cells. Methods Mol Biol 346:281–96Google Scholar
- 95.Miyawaki A (2003) Visualization of the spatial and temporal dynamics of intracellular signaling. Dev Cell 4:295–305CrossRefGoogle Scholar
- 96.Miyawaki A, Nagai T, Mizuno H (2005) Engineering fluorescent proteins. Adv Biochem Eng Biotechnol 95:1–15Google Scholar
- 97.Giepmans BNG, Adams SR, Ellisman MH, Tsien RY (2006) Review – The fluorescent toolbox for assessing protein location and function. Science 312:217–224CrossRefGoogle Scholar
- 98.Adams SR, Campbell RE, Gross LA, Martin BR, Walkup GK, Yao Y, Llopis J, Tsien RY (2002) New biarsenical ligands and tetracysteine motifs for protein labeling in vitro and in vivo: synthesis and biological applications. J Am Chem Soc 124:6063–6076CrossRefGoogle Scholar
- 99.Guignet EG, Hovius R, Vogel H (2004) Reversible site-selective labeling of membrane proteins in live cells. Nat Biotechnol 22:440–444CrossRefGoogle Scholar
- 100.Zimmermann T, Rietdorf J, Pepperkok R (2003) Spectral imaging and its applications in live cell microscopy. FEBS Lett 546:87–92CrossRefGoogle Scholar
- 101.van Munster EB, Gadella TW (2005) Fluorescence lifetime imaging microscopy (FLIM). Adv Biochem Eng Biotechnol 95:143–75Google Scholar
- 102.Piston DW, Rizzo MA (2008) FRET by fluorescence polarization microscopy. Methods Cell Biol 85:415–30CrossRefGoogle Scholar
- 103.Yan L, Rueden CT, White JG, Eliceiri KW (2006) Applications of combined spectral lifetime microscopy for biology. Biotechniques 41:249, 251, 253 passimCrossRefGoogle Scholar
- 104.Bird DK, Eliceiri KW, Fan CH, White JG (2004) Simultaneous two-photon spectral and lifetime fluorescence microscopy. Appl Opt 43:5173–82CrossRefGoogle Scholar
- 105.Fisz JJ (2009) Another treatment of fluorescence polarization microspectroscopy and imaging. J Phys Chem A 113:3505–16CrossRefGoogle Scholar
- 106.Tramier M, Coppey-Moisan M (2008) Fluorescence anisotropy imaging microscopy for homo-FRET in living cells. Methods Cell Biol 85:395–414CrossRefGoogle Scholar
- 107.Bader AN, Hofman EG, Voortman J, en Henegouwen PM, Gerritsen HC (2009) Homo-FRET imaging enables quantification of protein cluster sizes with subcellular resolution. Biophys J 97:2613–22CrossRefGoogle Scholar
- 108.Squire A, Verveer PJ, Rocks O, Bastiaens PI (2004) Red-edge anisotropy microscopy enables dynamic imaging of homo-FRET between green fluorescent proteins in cells. J Struct Biol 147:62–9CrossRefGoogle Scholar
- 109.Alamiry MAH, Harriman A, Mallon LJ, Ulrich G, Ziessel R (2008) Energy- and charge-transfer processes in a perylene–BODIPY–pyridine tripartite array. Eur J Org: Chem 16:2774–2782Google Scholar
- 110.Yao S, Schafer-Hales KJ, Belfield KD (2007) A new water-soluble near-neutral ratiometric fluorescent pH indicator. Org Lett 9:5645–8CrossRefGoogle Scholar
- 111.Povrozin YA, Markova LI, Tatarets AL, Sidorov VI, Terpetschnig EA, Patsenker LD (2009) Near-infrared, dual-ratiometric fluorescent label for measurement of pH. Anal Biochem 390:136–40CrossRefGoogle Scholar
- 112.Takakusa H, Kikuchi K, Urano Y, Kojima H, Nagano T (2003) A novel design method of ratiometric fluorescent probes based on fluorescence resonance energy transfer switching by spectral overlap integral. Chemistry 9:1479–85CrossRefGoogle Scholar
- 113.Snee PT, Somers RC, Nair G, Zimmer JP, Bawendi MG, Nocera DG (2006) A ratiometric CdSe/ZnS nanocrystal pH sensor. J Am Chem Soc 128:13320–1CrossRefGoogle Scholar
- 114.Kim S, Pudavar HE, Prasad PN (2006) Dye-concentrated organically modified silica nanoparticles as a ratiometric fluorescent pH probe by one- and two-photon excitation. Chem Commun (Camb) 19:2071–2073CrossRefGoogle Scholar
- 115.Andreescu S, Sadik OA (2004) Trends and challenges in biochemical sensors for clinical and environmental monitoring. Pure Appl Chem 76:861–878CrossRefGoogle Scholar
- 116.Riu J, Maroto A, Rius FX (2006) Nanosensors in environmental analysis. Talanta 69:288–301CrossRefGoogle Scholar
- 117.Patel PD (2002) (Bio)sensors for measurement of analytes implicated in food safety: a review. Trac-Trends Analyt Chem 21:96–115CrossRefGoogle Scholar
- 118.Gooding JJ (2006) Biosensor technology for detecting biological warfare agents: Recent progress and future trends. Anal Chim Acta 559:137–151CrossRefGoogle Scholar
