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Pietro Carrieri,Maria Petracca,Silvana Montella,Giovanni Cerullo,Ilaria Cerillo,Gianfranco Cimmino 대한신경과학회 2013 Journal of Clinical Neurology Vol.9 No.3
Sporadic Porphyria Cutanea Tarda in a Patient with Multiple Sclerosis Treated with Interferon Beta 1-a Therapy: A Case Report
Femtosecond Pulse Coupling to Near-Field Cantilevered Probes
M. Labardi,D. Polli,G. Cerullo,M. Allegrini,M. Zavelani-Rossi,O. Svelto,S. De Silvestri 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
A novel nanoprobe for space- and time-resolved nonlinear optical spectroscopy has been developed. The nanoprobe is based on aperture-type SNOM using cantilevered sensors (“SNOM cantilevers”), capable to couple much higher power to the sample as compared to usual tapered fiber probes, along with negligible effect on femtosecond pulse duration, as directly assessed by secondorder fringe-resolved autocorrelation in the near field. The use of such nanosource for pump-probe near-field spectroscopy promises to improve both time and space resolution with respect to the current state-of-the-art setups.
Regulation of photosystem I light harvesting by zeaxanthin
Ballottari, Matteo,Alcocer, Marcelo J. P.,D’Andrea, Cosimo,Viola, Daniele,Ahn, Tae Kyu,Petrozza, Annamaria,Polli, Dario,Fleming, Graham R.,Cerullo, Giulio,Bassi, Roberto National Academy of Sciences 2014 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.111 No.23
<P>In oxygenic photosynthetic eukaryotes, the hydroxylated carotenoid zeaxanthin is produced from preexisting violaxanthin upon exposure to excess light conditions. Zeaxanthin binding to components of the photosystem II (PSII) antenna system has been investigated thoroughly and shown to help in the dissipation of excess chlorophyll-excited states and scavenging of oxygen radicals. However, the functional consequences of the accumulation of the light-harvesting complex I (LHCI) proteins in the photosystem I (PSI) antenna have remained unclarified so far. In this work we investigated the effect of zeaxanthin binding on photoprotection of PSI–LHCI by comparing preparations isolated from wild-type <I>Arabidopsis thaliana</I> (i.e., with violaxanthin) and those isolated from the <I>A</I>. <I>thaliana</I> nonphotochemical quenching 2 mutant, in which violaxanthin is replaced by zeaxanthin. Time-resolved fluorescence measurements showed that zeaxanthin binding leads to a previously unrecognized quenching effect on PSI–LHCI fluorescence. The efficiency of energy transfer from the LHCI moiety of the complex to the PSI reaction center was down-regulated, and an enhanced PSI resistance to photoinhibition was observed both in vitro and in vivo. Thus, zeaxanthin was shown to be effective in inducing dissipative states in PSI, similar to its well-known effect on PSII. We propose that, upon acclimation to high light, PSI–LHCI changes its light-harvesting efficiency by a zeaxanthin-dependent quenching of the absorbed excitation energy, whereas in PSII the stoichiometry of LHC antenna proteins per reaction center is reduced directly.</P>