Search results for "BSI"
showing 10 items of 468 documents
Medioevo meridionale reinterpretato in un sito della Duke University
2017
Il nuovo sito della Duke University (http://kos.aahvs.duke.edu/kosredirect.php) è oggi certamente il luogo dove si concentrano più informazioni e dati iconografici relativi ai monumenti medievali dell’Italia meridionale. L’iniziativa possiede molti meriti ma bisogna anche riconoscere le problematicità che la struttura, l’essenziale schedatura e l’interpretazione dei dati producono. Il problema che non sembra si sia posto è quello di una lettura deformante dell’architettura prodotta da un certo tipo di rappresentazioni “fotogeniche” e dai filtri, nati tra XVIII e XIX secolo, che hanno contribuito all’invenzione di tradizioni e hanno generato un’idea del Sud composta da alcuni fortunati luogh…
Influence of pH and temperature on the early stage of mica alteration
2012
Mineral dissolution and precipitation reactions actively participate in controlling fluid chemistry during water–rock interaction. In this study, the changes in the biotite and muscovite basal surface nano-morphology were evaluated during interaction with fluids of different pH (pH = 1.1, 3.3 and 5.7) at different temperatures (T =2 5, 120, and 200 C). Results show that at the nanometre scale resolution of the atomic force microscope (AFM), dissolution generates etch pits with a stair-shaped pattern over the (0 0 1) surface. The flux of dissolved elements decreases when pH increases. However, at pH 5.7, a change was found in the flux after 42 h of reaction when abundant gibbsite and kaolini…
Environment and subsistence strategies at La Viña rock shelter and Llonin cave (Asturias, Spain) during MIS3
2020
The sites of La Viña and Llonin have an important archaeological sequence corresponding to Marine Isotope Stage 3: Mousterian, Aurignacian and Gravettian periods. La Viña is a complex rock shelter with continuous occupations, being some (basically the Mousterian and the Aurignacian in contact levels) altered by post-depositional processes as a consequence of the irregular bedrock morphology and the type of processes involved. The cave of Llonin mainly consists of occasional human/carnivores occupations during the Mousterian and the Gravettian. The current multidisciplinary research has allowed us to obtain and match several preliminary data: site formation processes, fauna and stable isotop…
Isolation and Characterization of Two Klebsiella pneumoniae Phages Encoding Divergent Depolymerases
2020
The emergence of multidrug-resistant bacteria is a major global health concern. The search for new therapies has brought bacteriophages into the spotlight, and new phages are being described as possible therapeutic agents. Among the bacteria that are most extensively resistant to current antibiotics is Klebsiella pneumoniae, whose hypervariable extracellular capsule makes treatment particularly difficult. Here, we describe two new K. pneumoniae phages, &pi
Structure and Function of CutC Choline Lyase from Human Microbiota Bacterium Klebsiella pneumoniae.
2015
CutC choline trimethylamine-lyase is an anaerobic bacterial glycyl radical enzyme (GRE) that cleaves choline to produce trimethylamine (TMA) and acetaldehyde. In humans, TMA is produced exclusively by the intestinal microbiota, and its metabolite, trimethylamine oxide, has been associated with a higher risk of cardiovascular diseases. Therefore, information about the three-dimensional structures of TMA-producing enzymes is important for microbiota-targeted drug discovery. We have cloned, expressed, and purified the CutC GRE and the activating enzyme CutD from Klebsiella pneumoniae, a representative of the human microbiota. We have determined the first crystal structures of both the choline-…
Une chapelle mariale romane à l’abbaye de Baume-les-Messieurs (Jura) ? Nouvelles données archéologiques du bâti
2012
L'abbaye de Baume-les-Messieurs est étroitement liée à l'histoire de Cluny, mais malgré cette filiation illustre, le monastère roman reste encore, pour une grande part, méconnu. Les recherches archéologiques menées sur l'abbatiale depuis 2007 ont largement enrichi nos connaissances sur l'édifice, mais les autres bâtiments de l'abbaye n'ont encore que très peu été étudiés en raison d'importantes transformations qui les ont affectés à la fin du Moyen Âge et à l'époque Moderne. L'abandon de la vie communautaire à la fin du xviie siècle entraîna en effet des modifications inhérentes au nouveau mode de vie des religieux et une grande partie des bâtiments, en particulier ceux situés à l'est du cl…
Multinationality, foreignness and institutional distance in the relation between R&D and productivity
2012
Abstract This paper empirically examines to what extent being foreign and part of a multinational affects the endogenous relation between R&D and productivity. Our findings indicate that multinationals obtain in general higher R&D returns. Also, there is a negative foreignness effect in that domestic-owned multinationals outperform foreign subsidiaries. However, these effects are somehow moderated by the institutional distance between the home and host countries. These results, obtained for a panel of UK firms, are largely consistent with a set of hypotheses derived from the institutional and international business theories.
Association between climate and new daily diagnoses of COVID-19
2020
AbstractBackgroundAlthough evidence is accumulating that climate conditions may positively or negatively influence the scale of coronavirus disease 2019 (COVID-19) outbreaks, uncertainty remains concerning the real impact of climate factors on viral transmission. Methods. The number of new daily cases of COVID-19 diagnosed in Verona (Italy) was retrieved from the official website of Veneto Region, while information on daily weather parameters in the same area was downloaded from IlMeteo website, a renowned Italian technological company specialized in weather forecasts. The search period ranged between March 1 to November 11, 2020. The number of new daily COVID-19 cases and meteorological da…
Plasmid-mediated QnrS2 determinant from a clinical Aeromonas veronii isolate.
2008
The main objective of this study was to determine the prevalence of the Qnr determinants in clinical and environmental Aeromonas spp. A total of 52 Aeromonas sp. isolates identified by biochemical methods (5), 25 isolated from natural waters (1) and 27 isolated from clinical samples from hospitals in Valencia, Spain, were tested for quinolone resistance by the disk diffusion method (4) (nalidixic acid, 30 μg; oxolinic acid, 2 μg; flumequine, 30 μg; ciprofloxacin, 5 μg; and levofloxacin, 5 μg). Among the studied isolates, 27 showed resistance to nalidixic acid and susceptibility to ciprofloxacin, 24 isolates were susceptible to both nalidixic acid and ciprofloxacin, and only 1, the A. veroni…
Biogenic iron-silver nanoparticles inhibit bacterial biofilm formation due to Ag+ release as determined by a novel phycoerythrin-based assay
2020
Silver nanoparticles (Ag-NPs) can be considered as a cost-effective alternative to antibiotics. In the presence of Fe(III)-citrate and Ag+, Klebsiella oxytoca DSM 29614 produces biogenic Ag-NPs embedded in its peculiar exopolysaccharide (EPS). K. oxytoca DSM 29614 was cultivated in a defined growth medium–containing citrate (as sole carbon source) and supplemented with Ag+ and either low or high Fe(III) concentration. As inferred from elemental analysis, transmission and scanning electron microscopy, Fourier transform infrared spectrometry and dynamic light scattering, Ag-EPS NPs were produced in both conditions and contained also Fe. The production yield of high-Fe/Ag-EPS NPs was 12 times …