Cytology, Histology and Histochemistry

La "Repubblica della scienza" nella Sicilia borbonica tra mito e realtà

L’indagine promossa da Domenico Ligresti ci restituisce un’immagine della società siciliana tra fine Settecento e prima metà dell’Ottocento molto articolata, punte di qualità si mescolavano a sacche di arretratezza. Emerge che la Sicilia del settecento era in sintonia con la realtà culturale europea. Lettere, libri, giornali e uomini circolavano in una “repubblica della scienza “ che superava i confini territoriali, ideologici e religiosi. Tutela dei beni culturali, creazione di un sistema universitario, studio della medicina, riforme amministrative apparentemente disegnano un percorso riformistico ideale, ma in realtà la creazione del Regno delle due Sicilie, la dura repressione dei moti r…

Application of an interspecific competition model to predict the growth of Aeromonas hydrophyla on fish surfaces during refrigerated storage (Anwendung eines Konkurrenzmodells zwischen zwei Spezies zur Vorhersage des Wachstums von Aeromonas hydrophila auf Fischoberflächen während der Kühlphase)

The growth of Aeromonas hydrophila and the aerobic mesophilic plate count (APC) on gilthead seabream surfaces was evaluated during refrigerated storage (21 days). The related growth curves were compared with those obtained by a conventional third order predictive model obtaining a low agreement between observed and predicted data (Root Mean Squared Error = 1.77 for Aeromonas hydrophila and 0.64 for APC).The Lotka-Volterra interspecific competition model was used in order to calculate the degree of interaction between the two bacterial populations (beta_{Ah/APC} and beta_{APC/Ah}, respectively, the interspecific competition coefficients of APC on Aeromonas hydrophila and vice-versa). Afterwa…

Search for Invisible Decays of a Dark Photon Produced in e+e− Collisions at BaBar

We search for single-photon events in 53  fb^{-1} of e^{+}e^{-} collision data collected with the BABAR detector at the PEP-II B-Factory. We look for events with a single high-energy photon and a large missing momentum and energy, consistent with production of a spin-1 particle A^{'} through the process e^{+}e^{-}→γA^{'}; A^{'}→invisible. Such particles, referred to as "dark photons," are motivated by theories applying a U(1) gauge symmetry to dark matter. We find no evidence for such processes and set 90% confidence level upper limits on the coupling strength of A^{'} to e^{+}e^{-} in the mass range m_{A^{'}}≤8  GeV. In particular, our limits exclude the values of the A^{'} coupling sugges…