Improved emission of SiV diamond color centers embedded into concave plasmonic core-shell nanoresonators

Configuration of three different concave silver core-shell nanoresonators was numerically optimized to enhance the excitation and emission of embedded silicon vacancy (SiV) diamond color centers simultaneously. According to the tradeoff between the radiative rate enhancement and quantum efficiency (QE) conditional optimization was performed to ensure ~2-3-4 and 5-fold apparent cQE enhancement of SiV color centers with ~10% intrinsic QE. The enhancement spectra, as well as the near-field and charge distribution were inspected to uncover the physics underlying behind the optical responses. The conditionally optimized coupled systems were qualified by the product of the radiative rate enhancements at the excitation and emission, which is nominated as Px factor. The optimized spherical core-shell nanoresonator containing a centralized emitter is capable of enhancing considerably the emission via bonding dipolar resonance. The Px factor is 529-fold with 49.7% cQE at the emission. Decentralization of the emitter leads to appearance of higher order multipolar modes, which is not advantageous caused by their nonradiative nature. Transversal and longitudinal dipolar resonances of the optimized ellipsoidal core-shell resonator were tuned to the excitation and emission, respectively. The simultaneous enhancements result in 6.2∙10^5 Px factor with 50.6% cQE at the emission. Rod-shaped concave core-shell nanoresonators exploit similarly transversal and longitudinal dipolar resonances, moreover they enhance the fluorescence more significantly due to their antenna-like geometry. Px factor of 8.34∙10^5 enhancement is achievable while the cQE is 50.3% at the emission. The enhancement can result in 2.03∙10^6-fold Px factor, when the criterion regarding the minimum QE is set to 20%

Eredményeink a teljes jogú Eurotransplant-tagság óta. A Debreceni Vesetranszplantációs Központ tapasztalatai

Absztrakt Bevezetés: A Debreceni Egyetemen 1991-ben végezték el az első veseátültetést. Hazánk 2013-ban csatlakozott az Eurotransplanthoz. Célkitűzés: A szerzők elemezték a tapasztalatokat. Módszer: 2008. január 1. és 2013. augusztus 31. között (A csoport = 163) és 2013. szeptember 1. és 2015. október 22. között végzett cadavervese-átültetések (B csoport = 90) adatait elemezték. Eredmények: Az élődonorok aránya 3,5%-ról 9,1%-ra nőtt. 2013 óta a recipiensek 25%-a 60 évesnél idősebb, a >30 kg/m2 testtömegindex aránya 31%-ra, a diabetesesek aránya kétszeresére emelkedett. Az ureteroneocystostomia mellett bevezetésre került a vég az oldalhoz ureteroureteralis anastomosis. Indukciós kezelés mellett az akut rejectiós epizód jelentősen csökkent (34%-ról 8%-ra). A technikai szövődmények aránya nem változott. A bakteriális fertőzések aránya csökkent (41%-ról 33%-ra). Az 1, 3 és 5 éves veseallograft-túlélések 86,6%, 85% és 82,7%, valamint 88%, 84% és 84% voltak a két csoportban. Következtetések: Az extended criteria donor arány emelkedett. 2013 óta lehetségessé vált az akut humoralis rejectio kezelése. Az esetszám-növekedés mellett az eredmények jók. Orv. Hetil., 2016, 157(24), 925–937

Biophysical characterization of histone H3.3 K27M point mutation

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Scattering of charged particles on two spatially separated time-periodic optical fields

We consider a monoenergetic beam of moving charged particles interacting with two separated oscillating electric fields. Time-periodic linear potential is assumed to model the light-particle interaction using a nonrelativistic, quantum mechanical description based on Gordon-Volkov states. Applying Floquet theory, we calculate transmission probabilities as a function of the laser field parameters. The transmission resonances in this Ramsey-like setup are interpreted as if they originated from a corresponding static double-potential barrier with heights equal to the ponderomotive potential resulting from the oscillating field. Due to the opening of new "Floquet channels," the resonances are repeated at input energies when the corresponding frequency is shifted by an integer multiple of the exciting frequency. These narrow resonances can be used as precise energy filters. The fine structure of the transmission spectra is determined by the phase difference between the two oscillating light fields, allowing for the optical control of the transmission

Interaction of Twisted Light with Electrons in Two-Dimensional Quantum Rings

We investigate the dynamics of charge carriers propagating in a ring being induced by twisted light: The exciting laser beam is assumed to have nonzero orbital angular momentum. The selection rules for the transitions between the eigenstates of the two-dimensional ring are determined with the aid of analytic and numerical methods. Using these results, we gain an insight into the physical process that leads to the transfer of the angular momentum of the laser beam to the electrons in the quantum ring