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001-es BibID:BIBFORM075133
Első szerző:Bene László (biofizikus)
Cím:Checkpoint for helicity conservation in fluorescence at the nanoscale : energy and helicity transfer (hFRET) from a rotating donor dipole / László Bene, Miklós Bagdány, László Damjanovich
Megjegyzések:Orientation factor (?2) for FRET from a rotating donor dipole, transferred helicity of the donor field and torqueexerted on the acceptor by the donor have been investigated in the framework of classical electrodynamics. It isshown that for rotating dipole, ?2 is significantly higher as compared to linear dipole independently of theorientation distribution of the donor and acceptor and whether the static or the dynamic rotational regimes areused for averaging ?2. By this property of ?2, FRET serves as an example for a phenomenon where local fieldinterference may take place in a "natural" way for emitters possessing rotating dipoles in their excited states bynature. The overlapping spatial distributions for the helicity of donor local field, torque exerted on the acceptorby the donor and for the FRET orientational factor suggest that transfer of both energy and helicity take placepredominantly in the plane of rotation by keeping the original direction of helicity, i.e. in accordance with theconservation law for helicity.Orienting FRET has been proposed by engineering local field structure by using elliptically polarized light fordonor excitation or by using linearly polarized light coupled with electromagnetic modification of the donorenvironment. The phenomenon of increased ?2 can be exploited for checking helicity conservation for differentFRET donors without the need for polarized detection optics. Modulation of FRET with changing ellipticity of theexcited donor state might supply structural and dynamical information on the orientational distribution of dyeholdingmatrices even on the surface of living cells, e.g. on the level of cell surface receptor clusters.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Orientation factor for FRET (?2), Elliptically polarized light, Angular momentum, Torque of local field, Local field interference, Nanoparticle (quantum dot/QD Plasmonic)
Megjelenés:Biophysical Chemistry. - 239 (2018), p. 38-53. -
További szerzők:Bagdány Miklós Damjanovich László (1960-) (általános sebész)
Pályázati támogatás:TÁMOP-4.2.2.A-11/1/KONV-2012-0045
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001-es BibID:BIBFORM004645
035-os BibID:(scopus)0033552675 (wos)000084290400003
Első szerző:Damjanovich Sándor (biofizikus)
Cím:Two-dimensional receptor patterns in the plasma membrane of cells : a critical evaluation of their identification, origin and information content / Damjanovich, S., Bene, L., Matko, J., Matyus, L., Krasznai, Z., Szabo, G., Pieri, C., Gaspar, R., Szollosi, J.
Megjegyzések:A concise review is presented on the nature, possible origin and functional significance of cell surface receptor patterns in the plasma membrane of lymphoid cells. A special emphasize has been laid on the available methodological approaches, their individual virtues and sources of errors. Fluorescence energy transfer is one of the oldest available means for studying non-randomized co-distribution patterns of cell surface receptors. A detailed and critical description is given on the generation of two-dimensional cell surface receptor patterns based on pair-wise energy transfer measurements. A second hierarchical-level of receptor clusters have been described by electron and scanning force microscopies after immuno-gold-labeling of distinct receptor kinds. The origin of these receptor islands at a nanometer scale and island groups at a higher hierarchical (mum) level, has been explained mostly by detergent insoluble glycolipid-enriched complexes known as rafts, or detergent insoluble glycolipids (DIGs). These rafts are the most-likely organizational forces behind at least some kind of receptor clustering [K. Simons et al., Nature 387 (1997) 569]. These models, which have great significance in trans-membrane signaling and intra-membrane and intracellular trafficking, are accentuating the necessity to revisit the Singer-Nicolson fluid mosaic membrane model and substitute the free protein diffusion with a restricted diffusion concept.
Tárgyszavak:Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban
Energy Transfer
Megjelenés:Biophysical Chemistry. - 82 : 2-3 (1999), p. 99-108. -
További szerzők:Bene László (1963-) (biofizikus) Matkó János (1952-) (biológus) Mátyus László (1956-) (biofizikus) Krasznai Zoltán (1950-) (biofizikus) Szabó Gábor (1953-) (biofizikus) Pieri, Carlo Gáspár Rezső (1944-) (biofizikus) Szöllősi János (1953-) (biofizikus)
Internet cím:DOI
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