Le istituzioni della memoria nel nuovo stato unitario: temi e problemi

A memory institution is a term used about institutions such as libraries, archives, museums "which serve as memories for given societies or mankind" (f. Wikipedia)."Progress can be made" wrote Michael Buckland "towards a coherent, unified view of the roles of archives, libraries, museums, online information services, and related organizations if they are treated as information-providing services". In this essay, the author examines the Italian memory institutions and the most important events in the last 15

Pseudomastus deltaicus , gen. et sp.n. (Polychaeta: Capitellidae) from a shallow- water bay in the North- Western Mediterranean Sea

4 Páginas ; 2 FigurasThe Els Alfacs Bay (Ebre Delta) located on the North- East coast of the Iberian Peninsula (Western Mediterranean, 40”33’-38’N, W32’44’E) is a semi-enclosed shallow water area which can be characterized as a ‘paralic’ environment (sensu Guelorget & Perthuisot 1983): although its hydrographic regime is basically marine, it is clearly influenced by the terrestrial freshwater inputs reaching the bay during the spring-summer period (Palacin et al. 1991). Several recent studies have been documented on the zoobenthos of the bay (Soler-Martinez 1988; Palacin 1990; Palacin et al. 1991; Capaccioni-Azzati 1987; Capaccioni & San Martin 1989-1990; Martin 1990, 1991; Martin & Giangrande 1991). The last five, in particular, focused on its polychaete fauna. Paralic environments like Els Alfacs Bay could offer particularly favorable sites for speciation because they are virtually isolated, having high levels of environmental stress. Among the results of the aforementioned studies, two new species of Polychaeta (Capaccioni & San Martin 1989-1990; Martin & Giangrande 1991) and 13 of Nematoda (Palacin 1990) have been identified. In 1984-1985, a large number of incomplete specimens of a Capitellid species were collected from muddy bottoms of the Els Alfacs Bay. They were identified initially as Pseudoleiocapitella fmiveli (Cap;iccioni-Azzati 1987). Additional entire spccimens of the same species were obtained in 1987. l’hc number o f 12 thoracic sctigci the different setal pattern, together with the prcscncc o f an abdominal branchiatc region, allow us to separate these spccirncns from all previously described gcnera and specics, although similarities can be lound with species of Pseudoleiocapitella and Mastobrunch us. Con sc q uc n t I y , ;I new genus and species of Capitellidae is described.Peer reviewe

geochemistry and geophysics of active volcanic lakes an introduction

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HCl degassing from extremely acidic crater lakes: preliminary results from experimental determinations and implications for geochemical monitoring.

Crater lakes are monitored to detect volcanic unrest starting from the assumption that they behave as condensers for magmatic gases. A further assumption is that acidic gases such as HCl are conservative once dissolved in water. This is not true for extremely acidic crater lakes, whose H + activity is high enough to induce Cl2 hydrolysis and consequently HCl degassing. This study presents the results of experimental determinations at 40–458C demonstrating that HCl degassing from acidic water depends on pH and Cl2 concentration. HCl degassing starts at pH values c. 0.05–0.1 with a rate of 5–10 mg min21 l21, increasing up to c. 70 mg min21 l21 at pH,20.2. This implies that the rate of HCl removal from a crater lake with a volume of 104–105 m3 and a seawater-like Cl2 concentration ranges from 5 to 50 t h21. The estimated HCl/H2O ratio in the separated vapour phase (0.01–0.2) is coherent with HCl/H2O ratios of fumaroles. Our experiments imply that: (i) the presence of very acidic gas species in fumaroles can be associated with a liquid-dominated feeding system, and (ii) dissolved in extremely acidic crater lakes, Cl2 behaves as a non-conservative component.Published97-1064V. Dinamica dei processi pre-eruttiv

The scholarly monograph and the challenges of Open Access

La monografia riveste ancora un ruolo importante all'interno del mondo accademico, anche se da tempo risente di una crisi legata alle profonde trasformazioni che hanno investito la comunicazione scientifica. Per fronteggiare questo problema il mondo dell'editoria ha preso in considerazione diverse soluzioni, tra cui quelle offerte dal modello Open Access (anche se il movimento OA ha inizialmente mostrato poco interesse nei confronti delle monografie, preferendo concentrarsi sugli articoli di rivista). D'altra parte, negli ultimi anni il ruolo degli editori accademici all'interno del movimento OA è cambiato, e oggi non sono più considerati come degli antagonisti. L'autore mostra come gli Open Access book non siano nati in contesto accademico, ma in ambito editoriale, e nella parte finale dell'articolo fornisce un ampio resoconto dei più recenti sviluppi nel settore delle monografie scientifiche ad accesso aperto.Scholarly monographs still play an important role in the university, despite the crisis due to the deep transformations occurred in scientific communication. Academic publishers have made several attempts to overcome this critical juncture, and they took into consideration the Open Access model (note that – since the beginning – the OA movement has focused mainly on articles, paying very little attention to monographs). On the other hand, in recent years the role of academic publishers within the OA movement has changed, and they're no longer seen as antagonists. The author demonstrates how Open Access books were born in a publishing context rather than in an academic one, and describes the latest updates in OA scholarly monographs

Influence of petrographic textures on the shapes of impact experiment fine fragments measuring several tens of microns: Comparison with Itokawa regolith particles

In 2010, fine regolith particles on asteroid Itokawa were recovered by the Hayabusa mission. The three-dimensional microstructure of 48 Itokawa particles smaller than 120 µm was examined in previous studies. The shape distribution of Itokawa particles is distributed around the mean values of the axial ratio 2:√2:1, which is similar to laboratory impact fragments larger than several mm created in catastrophic disruptions. Thus, the Itokawa particles are considered to be impact fragments on the asteroid's surface. However, there have never been any laboratory impact experiments investigating the shapes of fine fragments smaller than 120 µm, and little is known about the relation between the shapes of fine fragments and the petrographic textures within those fragments. In this study, in order to investigate the relation between the petrographic textures and the shapes of fine fragments by impacts, the shapes of 2163 fine fragments smaller than 120 µm are examined by synchrotron radiation-based microtomography at SPring-8. Most samples are fine fragments from basalt targets, obtained in previous laboratory impact experiments by Michikami et al. (2016). Moreover, two impacts into L5 chondrite targets were carried out and the shapes of their fine fragments are examined for comparison. The results show that the shape distributions of fine fragments in basalt targets are similar regardless of impact energy per target mass (in contract to the shape distribution of relatively large fragments, which are affected by impact energy), and are similar to those in L5 chondrite targets and Itokawa regolith particles. The physical process producing these fine fragments would be due to multiple rarefaction waves in the target. Besides, the petrographic textures do not significantly affect the shapes of fine fragments in our experiments. On the other hand, according to Molaro et al. (2015), the shapes of the fragments produced by thermal fatigue by the day-night temperature cycles on the asteroid surface are influenced by the petrographic textures. Therefore, we conclude that the Itokawa particles are not the products of thermal fatigue but impact fragments on the asteroid surface

Effects of mannan oligosaccharide dietary supplementation on mortality, growth performance and carcass traits in meat Guinea pigs

The effects of mannan oligosaccharide (MOS) as a dietary supplement on growth performance, carcass traits and mortality in meat guinea pigs were compared to a commonly used antimicrobial growth promoter (AGP, Zn-Bacitracin). The four experimental treatments were as follow: Control group (no additives); MOS 1 (1.5 g kg−1); MOS 2 (2 g kg−1) and AGP (0.1 g kg−1). The guinea pigs were housed in 40 floor pens containing a deep litter of woodchips (n = 100 animals in each trial; 10 animals per pen). Guinea pigs were all weaned on day 28 and their body weight was measured weekly. All animals were slaughtered at the end of fattening period (day 77) and carcass traits were evaluated. Significant differences against the control group were observed for traits studied (P < 0.05). Between MOS groups and AGP no significant differences were observed. In conclusion, the use of MOS could be a suitable replacement for antibiotic growth promoter to raise guinea pigs.Veterinari