Search results for "Helle"
showing 10 items of 153 documents
Mineralogical and petrographic analysis of early-Hellenistic mortars from a Punic-Roman residential area discovered at Palermo (Sicily)
2015
Lime based mortars dated back to 4th-3rd century BC were sampled in a Punic-Roman residential area recently brought to light in the historical centre of Palermo. The collected mortars have been analyzed by optical microscopy (PLM), X-ray powder diffraction analysis (XRPD) and scanning electron microscopy coupled with energy dispersive spectrometry (SEM-EDS). The study was aimed to characterize these materials from the textural and compositional point of view in order to define the recipes. The mineralogical and petrographic investigations allowed to establish 4 different recipes used for the formulation of the studied floor and wall mortars in terms of both compositional and textural featur…
Furostanol saponins and ecdysones with cytotoxic activity from Helleborus bocconei ssp. intermedius
2009
Two furostanol saponins helleboroside A (1) and helleboroside B (2) were isolated from the methanol extract of Helleborus bocconei Ten. subsp. intermedius (Guss.) Greuter and Burdet, along with the furospirostanol saponin 4 and two ecdysones: ecdysterone (5) and polypodyne B (6). Compound 2 was enzymatically hydrolysed to give product 3. The biological activity of all compounds was tested against rat C6 glioma cells showing a significant cytotoxicity for compounds 3, 4 and 6. Copyright © 2009 John Wiley & Sons, Ltd.
First record of the alien leech Myzobdella lugubris Leidy, 1851 (Hirudinea, Piscicolidae) in the Palearctic
2018
espanolEn este estudio reportamos la aparicion de la sanguijuela Neartica Myzobdella lugubris en un cuerpo de agua salobre de la reserva natural Riserva Naturale dello Stato “Le Cesine” (Apulia, Italy). Dos especimenes de la especie fueren recolectados en el cuello y las extremidades anteriores de una tortuga de estanque europea Emys orbicularis hellenica en Octubre del 2016. La identificacion de los dos especimenes fue basada en datos morfologicos y de secuenciacion molecular. En su distribucion natural, M. lugubris es conocida por ser huesped y vector de bacterias y virus, de los cuales algunos son patogenos de gravedad en peces. En vista de los posibles efectos nocivos, que ejercen sobre…
From ethnobotany to experimental research: the therapeutic properties of Sicilian hellebore
2018
In Sicily, the genus Helleborus (Ranuculaceae) is only represented by H. bocconei subsp. siculus (= H. bocconei subsp. intermedius). In some mountain areas of the Island, the rhizomes of this plant, harvested in a particular month of the year (May) and dried, are used in traditional veterinary practice for treating pneumonia in domestic animals, cattle and horses in particular. The same usage – with rhizomes of other Helleborus species or subspecies – is reported from various other areas of Mediterranean Europe. Phytochemical tests have permitted the isolation and characterization of new biologically active molecules. The extracts of rhizomes and aerial parts of the plant were shown antibac…
A fuzzy-logic-based controller for methane production in anaerobic fixed-film reactors
2017
The main objective of this work was to develop a controller for biogas production in continuous anaerobic fixed-bed reactors, which used effluent total volatile fatty acids (VFA) concentration as control input in order to prevent process acidification at closed loop. To this aim, a fuzzy-logic-based control system was developed, tuned and validated in an anaerobic fixed-bed reactor at pilot scale that treated industrial winery wastewater. The proposed controller varied the flow rate of wastewater entering the system as a function of the gaseous outflow rate of methane and VFA concentration. Simulation results show that the proposed controller is capable to achieve great process stability ev…
Spatial pattern analysis using hybrid models: an application to the Hellenic seismicity
2016
Earthquakes are one of the most destructive natural disasters and the spatial distribution of their epi- centres generally shows diverse interaction structures at different spatial scales. In this paper, we use a multi-scale point pattern model to describe the main seismicity in the Hellenic area over the last 10 years. We analyze the interaction between events and the relationship with geo- logical information of the study area, using hybrid models as proposed by Baddeley et al. ( 2013 ). In our analysis, we find two competing suitable hybrid models, one with a full parametric structure and the other one based on nonpara- metric kernel estimators for the spatial inhomogeneity.
Cesarea di Mauretania: la piccola Grecia di Giuba II, tra bronzi e marmi
2020
Punic Iol, renamed Caesarea in honour of Augustus under Juba II, and promoted by the latter to the rank of capital of the kingdom of Mauretania entrusted to him by the princeps in 25 B.C., underwent a splendid phase of development on the model of Hellenistic cities precisely between the end of the 1st century B.C. and the first part of the 1st century A.D. It is very probable that Juba II, who had grown up in Rome, had provided Caesarea with a port, as the intense trade with the Iberian Peninsula, Gaul and Italy, from whose marble quarries material was extracted for architectural constructions and decorations, as well as from those in Greece, would prove. Caesarea has returned a complex of …
La vocazione centripeta. Una divergenza ideologica tra Libanio e Temistio di fronte alla prospettiva costantinopolitana dei buleuti di Antiochia
2016
Questa ricerca è incentrata su due personaggi, Temistio e Libanio, che sono esempio di intellettuali orientati verso una prospettiva volta a cogliere i profili di interazione sociale che la loro attività letteraria seppe contemplare. Se i due sono assimilabili per formazione culturale e professione, restano tuttavia ben distinti l’uno dall’altro per tutte le altre rispettive scelte di vita: dal 354 d.C. Libanio si stabilisce definitivamente ad Antiochia, un anno prima di quello in cui Temistio viene nominato senatore di Costantinopoli, inaugurando di seguito la sua carriera di intellettuale organico. L’opera di Temistio e quella di Libanio sono, in realtà, due manifestazioni tra loro antipo…
SEM–EDS ANALYSIS AS A RAPID TOOL FOR DISTINGUISHING CAMPANIAN A WARE AND SICILIAN IMITATIONS
2013
The aim of this work is to examine whether it is possible to find chemical markers that allow a distinction to be made between the imported black glossed ‘Campanian A’ and the Sicilian imitation (end of fourth to first century BC) of these productions by carrying out quantitative chemical microanalysis of the slip using the SEM–EDS technique. The efficiency of the proposed analytical method has been tested on a set of ceramic samples corresponding to Sicilian black gloss imitations whose ceramic body has already been characterized petrographically by thin-section microscopy and chemically by XRF. The analytical data point to Na2O as a suitable chemical marker to distinguish between original…
Modernity in Antiquity : Hellenistic and Roman Philosophy in Heidegger and Arendt
2020
This article looks at the role of Hellenistic thought in the historical narratives of Martin Heidegger and Hannah Arendt. To a certain extent, both see—with G. W. F. Hegel, J. G. Droysen, and Eduard Zeller—Hellenistic and Roman philosophy as a “modernity in antiquity,” but with important differences. Heidegger is generally dismissive of Hellenistic thought and comes to see it as a decisive historical turning point at which a protomodern element of subjective willing and domination is injected into the classical heritage of Plato and Aristotle. Arendt, likewise, credits Stoic philosophy with the discovery of the will as an active faculty constituting a realm of subjective freedom and autonom…