Autor: Monteiro, F. - Prolib Integro

Skocz do pozycji: 1.

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Skocz do pozycji: 2.

Tytuł:: Asteroid sizes determined with thermophysical model and stellar occultations
Autorzy:: Libert, M.
Andersson, S.
Kulczak, P.
Horbowicz, J.
De Groot, H.
Schreurs, O.
Ellington, C.
Nosworthy, P.
Duffard, R.
Ferrais, M.
Carlson, N.
Oszkiewicz, D.
Takács, N.
Yamamura, H.
Geier, S.
Hirsch, R.
Csörnyei, G.
Murawiecka, M.
Ďurech, J.
Wünsche, N.
Collins, M.
Eleftheriou, M.
Pilcher, F.
Manna, A.
Lyzenga, G.
Rottenborn, M.
Frits, M.
Kretlow, M.
Ignácz, B.
Sonbas, E.
Liu, Y.
Dequinze, R.
Liu, R.
Polakis, T.
Błażewicz, D.
Filipek, M.
Skrzypek, J.
Ortiz-Ochoa, A. M.
Kankiewicz, P.
Monteiro, F.
Licandro, J.
Rutkowski, A.
Perig, V.
Żejmo, M.
Haymes, T.
Sobkowiak, K.
Agnetti, D.
Reddy, V.
Nadolny, J.
Hanna, W.
Zelený, P.
Sposetti, S.
Kaplan, M.
Nosal, P.
Mizutani, M.
Polák, J.
Swift, T.
Boninsegna, R.
Poláček, M.
Nikitin, V.
Nemoto, T.
Kudak, V.
Kamińska, M. K.
Tychoniec, Ł.
Szyszka, K.
Grice, J.
Marciniak, A.
Vida, K.
Bacci, R.
Eisfeldt, D.
Michniewicz, O.
Żukowski, K.
Lecossois, M.
Zawilski, M.
Higgins, D.
Bacci, P.
Messner, S.
Sárneczky, K.
Urakawa, S.
Skiff, B.
Bredner, E.
Gault, D.
Dogramatzidis, M.
Choukroun, A.
Baruffetti, P.
Dróżdż, M.
Kidd, S.
Rives, J.-J.
Pawłowski, M.
Stewart, C.
Golonka, J.
Smith, D.
Ogłoza, W.
Kubánek, J.
Saci, K.
Kim, M.-J.
Jehin, E.
Cseh, B.
Pál, A.
Antuszewicz, D.
Kalup, Cs.
Oey, J.
Petrescu, E.
Kirpluk, B.
Podlewska-Gaca, E.
Broughton, J.
Szakáts, R.
Beisker, W.
Stewart, W.
Horti-Dávid, Á.
Grazzini, L.
Anderson, C.
Konstanciak, I.
Jones, A.
Weber, C.
Dunham, D.
Miftah, M. A.
Jones, R.
Casalnuovo, G.
Harman, M.
Herald, D.
Delincak, P.
Gährken, B.
Hasubick, W.
Fini, P.
Maley, P.
Molnár, L.
Kattentidt, B.
Malagon, C.
Morales, N.
O’Connell, M.
Santana-Ros, T.
Galli, G.
Bora, Zs.
Denyer, P.
Choi, Y.-J.
Szkudlarek, M.
Ossola, A.
Guhl, K.
Leiva, R.
Borkowski, M.
Kamiński, K.
Cikota, S.
Pakštienė, E.
Fauvaud, M.
Maestripieri, M.
Yoshihara, H.
Popowicz, A.
Krannich, G.
Butkiewicz-Bąk, M.
Uno, M.
Gimple, B.
Polińska, M.
Sempronio, V.
Bertini, M.
Ruocco, N.
Lindner, P.
Casarramona, F.
Karagiannidis, A.
Newman, J.
Mieczkowska, I.
Kim, D.-H.
Benedyktowicz, L.
Fauvaud, S.
Zoła, Stanisław
Perła, J.
Arcoverde, P.
Aubry, R.-L.
Opis:: Context. The sizes of many asteroids, especially slowly rotating, low-amplitude targets, remain poorly constrained due to selection effects. These biases limit the availability of high-quality data, leaving size estimates reliant on spherical shape assumptions. Such approximations introduce significant uncertainties propagating, for example, into density determinations or thermophysical and compositional studies, affecting our understanding of asteroid properties. Aims. This work targets poorly studied main-belt asteroids, for most of which no shape models were previously available. Using only high-quality, dense light curves, thermal infrared observations (systematically including WISE data), and stellar occultations, we aimed to produce reliable shape models and scale them using two independent techniques, allowing for size comparison at the end. We conducted two observing campaigns to achieve this: one to obtain dense photometric light curves and another to acquire multi-chord stellar occultations by these objects. Methods. Shape and spin models were reconstructed using light curve inversion techniques. Sizes were determined via two methods: (1) advanced thermophysical modelling using the convex inversion thermophysical model (CITPM), which optimises spin and shape models to light curve data in the visible range together with infrared data, and (2) scaling the shape models with stellar occultations. Results. We obtained precise sizes and shape models for 15 asteroids. CITPM and occultation-derived sizes agree within 5% for most cases, demonstrating the reliability of the modelling approach. Larger discrepancies are usually linked to incomplete occultation chord coverage. The study also provides insights into surface properties, including albedo, surface roughness and thermal inertia. Conclusions. The use of high-quality data, coupled with an advanced TPM that uses both thermal and visible data while allowing the shape model to be adjusted according to both types of data, enabled us to determine sizes with precision comparable to those derived from multichord stellar occultations. We resolved substantial inconsistencies in previous size determinations for target asteroids, providing good input for future studies on asteroid densities and surface properties.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: The challenging combination of intense fluorescence and high singlet oxygen quantum yield in photostable chlorins : a contribution to theranostics
Autorzy:: Dąbrowski, Janusz
Schaberle, Fábio A.
Silva, Elsa F. F.
Monteiro, Carlos J. P.
Arnaut, Luis G.
Opis:: High fl uorescence quantum yields, high singlet oxygen quantum yields and intense absorptions in the phototherapeutic window are fundamental properties for compounds intended for fl uorescence diagno- sis and photodynamic therapy. We report on photostable chlorins that combine these properties. The fl uorinated tetraphenylchlorin FCMet has Φ F = 0.396 and Φ Δ = 0.58 ± 0.07, whereas F 2 CMet has Φ F = 0.360 and Φ Δ = 0.54 ± 0.05, and both have molar absorption coe ffi cients larger than 30000 M − 1 cm − 1 above 650 nm. These dual functional agents use nearly all the energy absorbed to perform the desired functions and are appropriate for theranostics applications.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Tytuł:: Mechanisms of singlet-oxygen and superoxide-ion generation by porphyrins and bacteriochlorins and their implications in photodynamic therapy
Autorzy:: Arnaut, Luis G.
Pereira, Mariette M.
Formosinho, Sebastião J.
Dąbrowski, Janusz
Monteiro, Carlos J. P.
Stochel, Grażyna
Simões, Sérgio
Silva, Elsa F. F.
Serpa, Carlos
Urbańska, Krystyna
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Mechanisms of singlet-oxygen and superoxide-ion generation by porphyrins and bacteriochlorins and their implications in photodynamic therapy
Autorzy:: Formosinho, Sebastião J.
Arnaut, Luis G.
Simões, Sérgio
Stochel, Grażyna
Silva, Elsa F. F.
Pereira, Mariette M.
Serpa, Carlos
Dąbrowski, Janusz
Monteiro, Carlos J. P.
Urbańska, Krystyna
Opis:: New halogenated and sulfonated bacteriochlorins and their analogous porphyrins are employed as photosensitizers of singlet oxygen and the superoxide ion. The mechanisms of energy and electron transfer are clarified and the rates are measured. The intermediacy of a charge-transfer (CT) complex is proved for bacteriochlorins, but excluded for porphyrins. The energies of the intermediates and the rates of their interconversions are measured, and are used to obtain the efficiencies of all the processes. The mechanism of formation of the hydroxyl radical in the presence of bacteriochlorins is proposed to involve a photocatalytic step. The usefulness of these photosensitizers in the photodynamic therapy (PDT) of cancer is assessed, and the following recommendations are given for the design of more effective PDT protocols employing such photosensitizers: 1) light doses should be given over a more extended period of time when the photosensitizers form CT complexes with molecular oxygen, and 2) $Fe^{2+}$ may improve the efficiency of such photosensitizers if co-located in the same cell organelle assisting with an in vivo Fenton reaction.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: Synthesis, photophysical studies and anticancer activity of a new halogenated water-soluble porphyrin
Autorzy:: Peixoto, Andreia F.
Dąbrowski, Janusz
Stochel, Grażyna
Pereira, Mariette M.
Urbańska, Krystyna
Monteiro, Carlos J. P.
Karocki, Andrzej
Arnaut, Luis G.
Opis:: A water-soluble halogenated porphyrin, namely 5,10,15,20-tetrakis(2-chloro-3-sulfophenyl)porphyrin ($TCPPSO_{3}H$), was prepared and evaluated as sensitizer for photodynamic therapy (PDT). Photophysical properties of $TCPPSO_{3}H$, such as high photostability, long triplet lifetime and high singlet oxygen quantum yield suggest high effectiveness of this class of halogenated porphyrins in PDT. $TCPPSO_{3}H$ is non-toxic in the dark and causes a significant photodynamic effect examined against MCF7 (human breast carcinoma), SKMEL 188 (human melanoma) and S91(mouse melanoma) cell lines upon red light irradiation (cutoff < 600 nm) at low light doses. Time-dependent cellular uptake of $TCPPSO_{3}H$ reached plateau at 120 min and was the highest for S91, 20% lower for MCF7 and 70% lower for SKMEL 188. Our results show that this halogenated water-soluble porphyrin is an efficient photosensitizer and reveal the potential of this class of compounds as PDT agents.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego